00751
DEPARTMENT OF THE ARMY
NORFOLK DISTRICT, CORPS OF ENGINEERS
FORT NORFOLK. 803 FRONT STREET
NORFOLK, VIRGINIA 23S!0
REPLY TO
ATTENTION OF-
00701
NAOEN-WW
30 January 1981
Mr. Howard Zar
U. S. Environmental Protection Agency
Enforcement Division
230 S. Dearborn Avenue
Chicago, Illinois 60604
Dear Mr. Zar:
As a follow-up to your recent telephone conversation with Mr. Richard
Klein, of my staff, I have inclosed a copy of the feasibility report
(Inclosure 1) for our proposed Maintenance Dredging Demonstration Project
in the Lower James River, Virginia. The purposes of this project are
txrofold; to accomplish necessary maintenance of the Federal navigation
channel, and to demonstrate a proposed method of removing contaminated
sediments at nearly in situ density and with nearly one-hundred percent
containment. I hope the report contains information of use to you and
others in your agency involved x^ith the dredging of contaminated
sediments.
As Mr. Klein mentioned to you, we are very interested in the dredging and
PCB clean-up operation the Environmental Protection Agency is planning
for Waukegan Harbor on Lake Michigan, which we learned about from an
article in the New York Times (Inclosure 2). We would appreciate
receiving from you any additional information or reports regarding the
Waukegan Harbor Project which you could make available to us now or at a
later date. To further this exchange of information, I will also send
you any future reports resulting from our project in the James River.
Sincerely,
2 Incl
As stated
ACK G. STf
Chief, Engineering Division
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.-IV S
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-JAMES "RIVER
DEMOA/5TRAT/CA/ PROJECT
INDEX
1. FOREWORD
II. INTRODUCTION
III. CUTTER SUCTION/DUSTPAN DREDGING
1. Cutter Suction Dredging
2. Dustpan Dredging
Manoevring Wires
IV. FLOW CONTROL
Homogeneous Mixtures: Non-Newtonian
V. INLET CONDITIONS
VI. EFFECT OF VIBRATION ON CEMENT SURRY
VII. INSTRUMENTATION
VIII. SAMPLING TECHNIQUE
IX.
X.
XI.
XII.
DEPTH MEASUREMENT
TEST NO. 1
DREDGING TESTS
ADAPTION OF DUSTPAN HEAD
4 Pages
2 Pages
3 Pages & Fig. 1
2 Pages
2 Pages & 2 Graphs
2 Pages
2 Pages & Fig. 1
& Photo 5
& Photo 6
2 Pages & Fig. 1
& Fig. 2
2 Pages & Sheet D2-40
2 Pages & Equipment
Quotations:
1) D.T.C.
2) Texas Instrument
3} Automation Products
2 Pages & Equipment
Leaflets:
1) JABSCO
2) Martek
& Fig. 1
& Fig. 2
& Fig. 3
& Fig. 4
1 Page & Equipment
Leaflets:
1) Decca
2) Harnessen Marine
3) Furuno
& Fig. 1
2 Pages
1 Page
3 Pages & Figs, la-lb-lc
& Figs. 2a-2b-2c
& Figs. 3a-3b
U.S. Environmental Protection Agency
GLNPO Library Collection (PL-120
77 West Jackson Boulevard,
Chicago, IL 60604-3590
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I. FOREWORD
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FOREWORD
The hazard of highly persistent, toxic substances contaminating large land and
water areas is a world wide problem. The problem of kepone contaminated silt
in the James River is a "case in point." Studies indicate that there are
9,000 to 17,000 kilograms (20,000 to 38,000 Ibs.) of kepone in the top one
foot of silt in the James River.
The U.S. Army Corps of Engineers published in June, 1978, "The EPA Kepone
Mitigation Feasibility Project Report, Appendix B." This Appendix addressed
itself to the problem, amongst others, of removing kepone contaminated silt
from the James River.
In June, 1979, Amalgamated Dredge Design, Inc., a Philadelphia based organiza-
tion specializing in the design of all types of dredges, submitted an Un-
solicited Proposal entitled "A Proposed Method for Removal of Contaminated
Soils from Marine Estuaries and Waterways by an Adoption of Conventional
Dredging Methods" to U.S. Army Corps of Engineers Norfolk Division.
A meeting was held at the offices of the Norfolk Division of the U.S. Army
Corps of Engineers in August, 1979 to discuss the unsolicited proposal and to
carry out an inspection of the James River, firstly by helicopter survey of
the source of the contamination, i.e., Bailey Creek-Bailey Bay-Gravelly Run
and a general overflight of the James River. A second inspection was carried
out by survey vessel in the area of Jamestown Island-Dancing Swan Point Shoal.
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One sample of bottom silt was obtained from Dancing Swan Point Shoal for visual
examination. At a meeting held on board the survey vessel and continued the
following day, it was agreed that a dredging test utilising a contractor's
dredge would be carried out in the James River in the zone of maximum tur-
bidity. This test, using standard equipment, would investigate various methods
of dredging with the aim of minimising dredge induced turbidity and of achieving
maximum containment of the contaminated silt at or as near in place density
as possible.
Further correspondence after this meeting resulted in the production of the
following scope of-work for Phase One of the projected test programme.
SCOPE OF WORK
FOR
DEMONSTRATION PROJECT IN JAMES RIVER, VIRGINIA
Phase One
1. The Contractor shall prepare a draft Plan of Study outlining the necessary
action for conducting a demonstration dredging project in the James River.
The purpose of the demonstration project is to compare the efficiency, plant
output, and environmental impacts of the typical hydraulic dredge with a cutter-
head and a Dustpan dredge.
2. Input into the Plan of Study will be by Waterways Experiment Station
in Vicksburg, Mississippi, and the Norfolk District. The Norfolk District will
prepare a history of dredging in the James River, from the mouth to Jordan Point
located at Hopewell, Virginia. This will include the areas dredged, amount of
material removed, and location of disposal areas, along with the type of dredge
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used. When discussing the type of dredge, the Norfolk District should provide
a physical description including such items as the dredge size, elevation of
lift, type of discharge unit used, pump, horsepower, horsepower of swinging
winches, horsepower of cutter, size of drums, size of cables, draft, description
of runners, etc. In addition, the Norfolk District will provide necessary
hydrologic data such as flood discharges, velocity profiles, tidal ranges, and
background sedimentation and turbidity information throughout preparation of
the Plan of Study and during the demonstration project. The Norfolk District
will negotiate with the State of Virginia concerning disposal areas. Also,
the Norfolk District will obtain sediment samples and perform a complete soil
analysis including the moisture content, liquid limit, plastic limit, and in-
place density.
3. The Buffalo District will be contacted by Norfolk District regarding
utilization of the density probe developed by Mr. Lee Hare. Hydrometer tests
will be performed and a chemical analysis of the sediment samples obtained
conducted. The Waterways Experiment Station will provide a list of tests that
will be conducted during the demonstration project, along with a detailed list
of information required concerning background conditions.
4. The Plan of Study will present a description of the Dustpan head and
the Cutterhead, how each functions, and the differences between the two. A
trip to the Lower Mississippi Valley Division will be made by the Contractor
for an onsight inspection of the Dustpan head and discussions with appropriate
personnel concerning the operation of the dredging equipment. Preliminary and
Conceptual plans will be prepared for modifying a typical dredge to accomooate
the Dustpan head, including such things as modification of winches, cables,
motors, the dredge ladder, etc. Consideration will be given to using the
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Dustpan head "as is" versus installing augers, water jets, or vibration units
to ease dredging. Such costing as is obtained during the course of the above
study will be provided.
5. The Contractor shall provide a list of the testing equipment necessary
and describe how it will be installed on the modified dredging plant. The
demonstration project will be performed within the turbidity maximum zone of
the James River and dredging should be associated with maintenance of the existing
Federal navigation project. A monitoring program will be developed, setting out
basic requirements for the testing programme, listing physical and chemical
analyses that must be performed during the actual dredging operation, and how
much turbidity is being created at the dredging head and what instrumentation
should be rented/acquired to perform the demonstration project.
6. The Contractor shall submit to the Norfolk District by 1 December 1979
a draft of the Plan of Study.
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II. INTRODUCTION
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Introduction
The proposed dredging test to be carried out in the James River will take
place in the zone of maximum turbidity in 1980.
The zone of maximum turbidity in an estuary is a feature of the natural dynamics
of the estuary. This zone is the area of mixing of salt and fresh water and its
position is therefore determined by river velocity variation due to rainfall
and also by the cyclic variation of the tidal rise and fall with the periodic
variation of spring and neap tides.
The fine sediments that are captured by the zone of maximum turbidity can
exist in three states:
(a) Mobile Suspensions> which develop naturally in high
turbidity estuaries and move regularly in response to
the tidal circulation. These suspensions evolve into
static suspensions during periods of low tidal circula-
\
tion. In low turbidity estuaries, these suspensions are
intermittently generated by storms, deep draft traffic
and dredging and evolve into static suspensions.
(b) Static Suspensions can usually be detected by echo sounders
and are usually referred to as "fluid mud" or "fluff."
These suspensions eventually settle to form settled silt.
(c) Settled Silt is a skeletal soil framework formed by
the consolidation of static suspensions.
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The following proposals assume the presence of mobile suspensions and
sampling and instrumentation will be specified accordingly.
In the absence of information in Phase One on the characteristics of the
contractor's cutter dredge, the preliminary study will be based on the
characteristics of a known dredge and modification to the study will be made
when the dredge to be used in the proposed test has been selected.
The "known" dredge characteristics have been selected to agree as closely as
possible with the dredges available in the Norfolk area, i.e., a 20 inch
discharge pipeline dredge.
This "known" dredge has the following characteristics:
Hull
Length 40.00 meters
Breadth 12.50 meters
Depth 2.50 meters
Cutter 400 H.P.
Swing Winch 80 H.P.
Swing Winch Pull - 1st Layer 23.4 tonnes
Rope Speed - 1st Layer 12 m/min.
Barrel Dia/Ctrs Rope- 1st Layer 0.737 m.
Max. Barrel Torque 8620 kg.m.
Barrel R.P.M. 5.17
Rope Size 32mm x 250 meters
Suction Frame Hoist Winch - Same as swing winch
Suction Frame Hoist Rope 32mm x 105 meters
Dredging Depth 15 meters
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III. CUTTER SUCTION/DUSTPAN DREDGING
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CUTTER SUCTION DREDGING/DUSTPAN DREDGING
(1) Cutter Suction Dredging
The cutter suction or radial cutting dredge would appear to be the ideal
dredge for removal of contaminated silt. For this application it possesses
the following advantages:
(a) Positive anchorage
(b) Accurate and positive movement over dredging area
(c) Positive means of excavating cohesive soil, i.e., a rotary cutter
(d) Means of discharging material over long distances by pipeline
(e) Accurate control of dredging depth
(f) Accurate control of output, i.e., by variation of cutter and swing
winch speeds
When dredging contaminated silt the cutter suction dredge has the following
disadvantages:
(g) Rotary cutter resuspends settled silts and creates unacceptable
levels of turbidity. The cutter also bulks the material, thus
increasing the water content of the silt, reducing output of solids
and creating water disposal problems on the deposit grounds.
In contaminated silts this action of resuspension disperses con-
tamination rather than contains it.
(h) The geometry of the radial cutting action is such that the radial
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width of cut varies proportionately with the angularity of the dredge
about the centreline of the cut. Figure 1 shows that utilising a
cutter head of 4 units of length, the radial width of cut would be
4 units only on the first swing; thereafter, the radial width of cut
would vary from 4 units on the centreline of the cut to 2.828 units
at an angle of 45° to the centreline of the cut.
This variation in width of cut would result in the ingress of water
through the area not blanked off by material, i.e., a radial width
varying from zero on the centreline of the cut to 1.172 units at an
angle of 45° to the centreline of the cut.
This smooth change of radial width of cut from 4 units to 2.828 units
would only be true if a modern cutter suction dredge with a travelling
digging spud was utilised. If a cutter suction dredge having two fixed
spuds was utilised, then the resultant cut would show considerable change
and irregularity over the dredging area contained within the "step ahead"
angle.
The difficulty posed in (g) above could be overcome by fitting a shoe
type head instead of the cutter on the cutter suction head. This head
would work somewhat like the trailing head on a hopper dredge and would be
designed to dredge in both directions. This head could dredge by suction
alone, be fitted internally with augers or cutters or could utilise vibration
to fluidise the settled silt.
The difficulty posed by (h) above could be overcome by arranging for the
width of the "shoe" type head to vary with the angularity of the dredge
about the centreline of the cut. This variation would require a movable
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In the proposed dredging, a contractor's pipeline dredge will be used and, as
the discharge will be close to the stern of the dredge, it will be necessary
to fit a nozzle or an orifice to the pipeline to enable the suction velocity to
be controlled within fine limits.
If the material to be dredged was abrasive, the only solution would be a
renewable nozzle at the terminal end of the pipeline. However, high concentra-
tions of fine silts in laminar flow due not tend to be highly abrasive so it is
suggested that an orifice is fitted in the discharge line with a mercury
manometer across the orifice.
By testing the dredge pump in water against the orifice, a set of head/capacity
curves for the dredge pump in the "as is" condition will be obtained. The
orifice results can be cross-checked by measuring the head loss over a measured
length of the discharge pipe and these results used later to correlate head
loss against mixture density in the system.
These tests, when correlated with engine power output, will enable the effect
of mixture density on pump efficiency to be obtained. These figures are
obviously very important if it is intended to pump the material ashore at a
later date.
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Homogeneous Mixtures: Non-Newtonian Liquids
When pumping homogeneous mixtures of fine silts and clays, the majority of
these suspensions exhibit non-Newtonian properties, i.e., their viscosity is
not constant but varies with the rate at which they are sheared. In dredging
the most common flow property encountered is the "Bingham plastic" flow.
A Bingham plastic can be regarded as a mixture requiring a minimum shear stress
to begin movement after which the shear stress is a linear function of rate of
shear, the slope of which is defined as "plastic viscosity."
The important feature of the "plastic" mixtures is that, unlike normal dredged
mixtures, laminar flow conditions can exist up to the normal operating velocities
of pipeline dredges.
Figure 1 illustrates the distribution of shear stress and velocity for the
laminar flow of Newtonian and non-Newtonian liquids.
For a Newtonian liquid where I/ * "^ sty , integration yields for circular
pipe PD/4L a 8yuV/D, i.e., the Poiseville equation. P « pressure drop in
length L, D s pipe diameter, V = mean velocity, y* = viscosity where
PD/4L is the shear stress at the wall, and 8V/D is the corresponding rate
of shear.
The shear stress distribution for the plastic material remains the same, a
maximum at the wall, and zero at the centre. Assuming the maximum stress
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exceeds the yield stress, then a velocity gradient will exist near the pipe
wall. At the smaller radius, the shear stress will have fallen below the yield
stress and thus the velocity gradient will become zero. As shown in Figure 1,
this results in the persistence of plug flow in the central region of the
pipe, the relative diameter of the plug being a function of the excess of the
maximum shear stress over the yield stress.
The attached photocopy of Photograph No. 5 taken of the discharge from the
pipeline of the Japanese dredge "Taian Maru" illustrates the laminar flow of
the silt/clay being dredged. The Photocopy of Photograph No. 6 demonstrated,
as the flow does not fill the pipe bore at the atmospheric point, that plug
flow, to some extent, must exist in the pipeline.
-------
ElQj.
Laminar Flow Characteristics
a) Newtonian
R r
I i
Stress distribution
Velocity distribution
b) Non-Newtonian
1 ^
« ' T
i i t
Stress distribution
Velocity distribution
^Amalgamated Dr>dg> D»ilgn Inc.
-------
Pho 10 i) Photos (j) uncf (I)) vvi-rt- t.lkci) Jl ly«i iUishnii.i.
I .il '-lii'l'i'' llowm'i i MI; nl id" (list iu.ii).' | HI ic (,
III) Sltuli|r llowinu nUi) j si'diinent jdon
-------
(2) Dredging of clayey silt (See Table 5 and Photo 6.)
TABLE 5
[>.i:ni>l»-!, of study**
Wuik DIM ,ix1
')(»•( '(ir qidVily ot p.li U< n.-s
Unil weight (tj rm ' )
l"«.il>-i ' iintt-nf ("• I
.'.. .! LiliiJ
C.i.u.-l
S.!li:l
'. ,)III|IM- ,ll|l|l "
5., ii
I '
M.iy
'...I.Mln Jtnnl
',':i.li|i- 1. i -.-il it"
..,.-li|. • ,11 1- ii- i|. .ji|i l-i-ii! Vill 1 1
•' .''.I, • i : i.i '
Sliuli)!' on vulx'tl DifUn'il Otidtjf
Nov '74
2 78 2.76
1 23 1.2-1 1 20 - 1 21
)4b - 150 180 - 190
A }'jH 5 46
0 0
? 2
G? 64
:u; 34
Ciuy", *ill
300
«r>
(00
Photo G (At Hakata)
-------
V. INLET CONDITIONS
-------
Inlet Conditions
When dredging silts at in place densities, the optimum inlet conditions are
similar to a clear water inlet with a shallow submergence, i.e.,
(a) The flow to the dredging head must be as uniform as possible. The
velocity of material to the head and the velocity of the head through
the material must be such that added water is not drawn into the head
by too low a velocity through the material or that material is not spilled
over the head by too high a velocity through the material.
(b) The submergence of the head in the material must be such that the
material will flow to the head under the influence of the hydrostatic
head difference over the inlet. If this hydrostatic difference, con-
trolled by the dredge pump speed, is too high for the submergence as
set, then vortexes will form along the leading edge of the dredge
head. These introduce water into the head without entraining solids
and thus reduce dramatically the density of the mixture being dredged.
Figure 1 illustrates typical water velocities in the dustpan head, of
the ACOE Dredge Jadwln, established using a small scale model at the ACOE
Waterways Experimental Station.
The effect of side wall friction is evident in these tests and this effect
will also be present when dredging. Due to the higher viscosity of the
dredged material and the probability of laminar flow, the possibility of
plug flow along the centre portion of each part of the double head is almost
certain.
-------
This flow pattern could be modified by fitting splitters inside the head
and these might need to be fitted after the preliminary dredging tests.
In order to minimise the production of vortexes at the entrance to the dustpan
head, an area between the double heads must be plated over and a "roll over"
bar fitted across the full width of both heads.
This "roll over" bar is a shaped plate designed to maintain the necessary
head of material over the top edge of the mouthpiece and also to prevent
overspill of material over the head by rolling the material forward on top
of the existing deposit.
The shape of this plate must be such that added turbidity is kept to a
minimum and overspill is prevented. This plate is indicated in Figure 2.
-------
J.I
Inlet Conditions
Centerllne of
Dustpan
t
Direction of FioW
Note • All Velocities «hown In Ft. per sec.
Amalgamated Drtdgt D««lgn Inc.
-------
Existing Dustpan head
Rollover plate
» Material seal
height
Profile
Plan View
AmolQomot«
-------
VI. EFFECT OF VIBRATION ON CEMENT SURRY
-------
Vibration as an Assist to Viscous Flow
Following the investigation of inlet conditions and the conclusion that "plug"
flow in the dustpan head was a distinct possibility, a search was made
through research journal to establish the effect of vibration on Bingham
Plastic.
The following pages illustrate the settling behavior of cement slurries. Fig. 4
illustrates how vibration hinders settling and the text of the research paper
points out that vibration after settling caused the settled material to
^F change to a suspension.
It is proposed that provision should be made in the head for the insertion
of a poker type vibrator so that vibration testing can be carried out if
"plug" flow should become a reality.
-------
EFFECT OF VIBRATION ON CEMENT SLURRY (BINGHAM PLASTIC)
The attached sheet, D2-40, from a paper entitled "The Formation of Structure
in Cement Slurries" by Dr. J. F. Raffle, read at Hydrotransport, 1 September 197C
illustrates one of the few examples available of the effect of a horizontal
vibration force of 0.Ig applied to a Binghatn Plastic.
Excess pressure, as recorded on the vertical axis of Figs. 1-3-4, is a
measure of settlement, the highest pressure being the liquid phase and the
lowest pressure the fully settled phase.
Fig. 1 Illustrates the settlement that would be expected of fine sands,
i.e., Newtonian Fluids. Of note here is the result that, ir-
respective of the initial height of the column of mixture and
the specific gravity of the mixture, full settlement takes the
same time, i.e., approximately 18 minutes for the six examples
sfiown.
Fig. 2 Illustrates the settling plus freezing of cement slurries.
Fig. 3 Illustrates the effect of vibration. Of note here is the long
duration of the liquid phase, approximately 130 minutes. This
relatively weak vibration has the effect not only of hindering
settlement but when settlement was complete a short period of
vibration caused the measured excess pressure to rise back to
nearly its starting value.
This test demonstrates that high concentration of cement slurries
which exhibit Bingham Plastic properties can be liquidified by
relatively weak vibratory forces.
-------
(SUCTION
24.
WATER/SOLIDS 03J
— —WATER/kXIDS &30
6 12 18 24
FIGl VARIATION OF EXCESS PRESSURES
GLASS BEADS/WATER
FIG 2 PRESSURE MEASUREMENT SYSTEM.
— .-w/C- 0-t
W/C-O-W
----NO VIBRATION
-lj CONTINUOUS-
VIBRATION.
SO IOO
FIG 3 VARIATION OF EXCESS PRESSURES
SLURRIES.
ICXD ISO
EFFECT OF VIBRATION ON VARIATION OF
EXCESS PRESSURES.
D2-40
-------
VII. INSTRUMENTATION
-------
INSTRUMENTATION
Velocity/Density Measurement
The most commonly used measuring device, in dredge operation, for determining
velocity and density is the integrated radioactive density-electromagnetic
velocity meter.
The signals from the density and velocity sensors are integrated to give rate
of discharge of dry solids and total quantity over a period of time.
Attached are quotations from Dredge Technology Corporation of New York and
Texas Instruments, Inc. The first is manufactured fay IHC Holland and the latter
is of 100% American origin.
Due to the relatively short period of the proposed dredging test, it has not
been possible to persuade either of these firms to hire this equipment.
As a low cost alterantive to radioactive density meters it is suggested that
an acceptable alternative would be a Dynatrol Density meter. In the Dynatrol
systems some of the dredged material is bye passed to flow through a relatively
small bore "U" tube. Attached is a copy of quotation from Messrs. Automation
Products.
This "U" tube is vibrated electrically. The drive coil is electrically excited
by a pulsating current which drives the "U" tube into mechanical vibration. The
vibration becomes a function of the mass contained in the "U" tube. If the
density or specific gravity of the dredged material is increased, the effective
-------
mass of the "U" tube increases, conversely if the density decreases the
effective mass of the "U" tube decreases.
This vibration is sensed by a pick-up consisting of an armature and coil
arrangement. The vibration of the pick-up armature induces an A-C voltage in
the pick-up coil. This output from the pick-up coil is a function of the
density, specific gravity or % of solids in the mixture.
In general dredging of abrasive materials, this device has obvious limitations
due to the heterogeneous nature of the mixture. However, when dredging homo-
geneous mixtures of fine silts and clays, the bye passed sample is representa-
tive of the total flow.
This instrument has a high degree of accuracy and thus is very suitable for the
proposed test where the relationship between in-place density and dredged
density will be the measure of success or otherwise of the dredging method.
The sample being bye passed can be obtained by a sampling pump, by fitting the
device at the end of the pipeline or by fitting it across an orifice. The
latter would seem to be the most satisfactory solution for the proposed dredging
test.
-------
Affiliated wltti
John J MCMutten Assocatn.mc.and WC Hotand
October 2, 1979
Amalgamated Dredge Design, Inc.
842 Public Ledger Building
Independence Square
Philadelphia, PA 19106
ATTENTION:
SUBJECT:
REFERENCE:
Gentlemen:
Mr. A. D. Manwell
DREDGE INSTRUMENTATION
ADD 115
DTC 3005F
lifc.-^
In reply to your letter of 13 September 1979, DTC is pleased to quote
as follows:
A)
1 IHC Holland integrated radio active density - electro magnetic
velocity pick-up, consisting of an 'Altoflux' velocity pick-up
with built-on density pick-up. (Sheet C.C.2.3.1/2)
Internal Diameter
Measuring Tube
Internal Lining
R.A. Isotope
Electrodes
Coils
Power Supply
Tube Length
Flanges
PRICE: $44,620.00
20 inches F.G. 500 mm.
Stainless Steel
35 mm. Polyurethane - Fixed
Cobalt 60
Stainless Steel
Insulation Class E
110/220 V - 50/60 HZ - abt. 2 KVA.
600 mm.
According to DIN - ND10 - NW/ASA
150 Ibs.
B) Alternative for Item 'A)1:
1 IHC Holland integrated R.A. density-/E.M. velocity pick-up,
as described above, however with a replaceable lining.
(Sheet C.C.2.3.1/2).
20 inches E.G. 500 mm.
Stainless Steel
Replaceable Rubber Lining, with
Wear-Alarm Transducer.
Cobalt 60
Carbon Rubber
Insulation Class E.
110/220 V - 50/60 HZ - abt. 2 KVA.
Internal Diameter
Measuring Tube
Internal Lining
R.A. Isotope
Electrodes
Coils
Power Supply
On* World Trade Canter, Suite 3047
New York. M Y.I 0048
Tetex: 222731 R.C.A.
422043 I.T.T.
66133 W.U.I
7105815388 TWX
(212) 775-0567
-------
Amalgamated Dredge Design, Inc. Page 2
October 2, 1979
- Tube Length : 800 mm.
- Flanges : According to DIN - ND10 - NW/ASA
150 IDS.
PRICE: $57.850.00
C) 1 Spare Liner for the above indicator.
PRICE: $7,650.00
D) 1 Tool for Replacement of the Liner.
PRICE: $1.100.00
E) 1 IHC Holland Production Indicator for calculation, indication
and totalization of the amount of dry solids, transported through
a dredging delivery pipeline. • The production indicator is housed
in a cabinet for wall mounting (Sheet C.C. 2.4.1/4).
- Power Supply : 110/220 V - 50/60 HZ - abt. 2 KVA.
Price: $12,525.00
F) 1 set of three (3) separate repeater indicators for use with the
production indicator, calibrated in equalling scale values, to be
mounted in the dredge masters desk. Size: 96 X 96 mm., for velocity,
density and cubic meters per second.
Price: $650.00
G) 1 yield indicator with cross needle system. The yield indicator is
meant to be used with the production indicator system. The yield in-
dicator is meant to be built-in the dredge masters desk.
Size: 240 X 240 mm.
Price: $1,970.00
H) 1 IHC Holland Electr. vacuum indicator consisting of: (Sheet C.C.2.8.1/2).
- Vacuum Transducer 'V.M.T.-100'.
- Amplifier Type 'M.V./P.M.1.
Power Supply : 110/220 V 50/60 HZ - abt. 10 VA.
- Remote Indicator - Size: 96 X 96 mm.
Price: $3.920.00
-------
Amalgamated Dredge Design, Inc. Page 3
October 2, 1979
I) 1 IHC Holland Electr. Pressure Indicator consisting of:
(Sheet C.C.2.8.1/2).
- Pressure Transducer "P.M.T.-4001.
- Amplifier Type 'M.V./P.M.'.
Power Supply: 110/220 V - 50/60 HZ - abt. 10 VA.
- Remote Indicator - Size: 96 X 96 mm.
Price: $3.920.00
Import duties are included in the prices quoted. However, no other U.S.
taxes that may be required due to the supply of the above equipment or
any other affiliated services are included.
Delivery: C.I.F. East Coast U.S.A. Port.
Delivery Time: About 5 months after receipt of order.
Payment: 50* with order,
50% on delivery, within 30 days after date of invoice.
Validity: Until 27 October 1979
Conditions: 'IHC General Conditions' as attached will apply.
The sheet numbers shown in parenthesis (e.g. C.C.2.8.1/2) are attached to
provide an exact technical description of our scope of supply.
Please let us know if we can be of further assistance on this project.
Very truly yours,
DREDGE TJKHtX$DGX$RPORA7lON
John P. Martin
President
JPM:tl
Encl.
cc: Mr. S. B. Field
Mr. J.J.C.M. van Dooremalen
-------
Texas Nuclear
Division
Ramsey Engineering Company
Box 9267
Austin. Texas 78766 USA
Telephone (512) 836-0801
Telex 77-6413
Quotat'u
To:
We are
Amalgamated Dredge Design, Inc.
856 Public Ledger Bui dl ing
Independence Square
Philadelphia, Pennsylvania 19106
Attention: Mr. A. D. Manwell
lo submit the following quotation:
Dale.
October 30. 1979
F-10-044-79
Quotation Mo. ___
Please give this quotation number when ordering
Your Inquiry re1an»nce
Your Reference ADD.115
Your Letter dated October 11, 1979
Quantity
Description
Delivery
Unit Price
Total
Production Monitoring System
System includes:
(1) SG Series Density Gauge
Density Gauge System No. SGF202M24437M22AEFOXS
Sytem includes:
-Amplifier/detctor in a NEMA IV enclosure
-Detector in a NEMA IV housing
-24 inch pipe saddle
-4000 mCi Cesium 137 source
-Source head with three position shutter (open,
closed,standard) lockable in each position
-4-20 mA linear density output
-4-20 mA linear mass flow output
-Totalizer driver with integral 6-digit
non-resettable totalizer
-Signal Linearizer
-Mass flow multiplier (accepts 4-10 mA
flowmeter signal)
-Automatic Source Decay Compensator
(1) Foxboro 2800 Series Flowmeter
(1) Foxboro E-96 Flow/Current Converter
(1) Crossed Point Display
Lot Price for System
.$50,993.00
OPTIONS:
-D.C.Heater Package
-Three channel recorder
Delivery: as outlined in proposal.
ADD
ADD"
$ 750.00
$2469.00
i Austin, Texas Shipping Charges: Collect
.tt: Nat X day* See otner side lor terms and conditions
This quotation firm tor 60—<*•*• attar above data
er J. Fredricks, Regional Sales Manage;
1
-------
SYSTEM OFFERED, PERFORMANCE AND WARRANTY
INTRODUCTION
Texas Nuclear radiation denstiy gauges provide precision and reliable
measurement and indication of process conditions in thousands of in-
stallations throughout the world. Applications include the measurement
of density and/or solids flow in chemical streams, slurry lines, and
sewage sludge lines. Interest in nuclear gauging for dredging appli-
cations has lead to the use of density-measuring equipment aboard var-
ious types of dredges, when the density equipment is combined with
flow-measuring equipment, density, velocity, and solids flow may be
continuously measured and displayed at the dredge operator's station,
allowing the lever man to more precisely control the dredging operation
in terms of these parameters.
Regardless of quality and accuracy of the sensors involved, the inherent
nature of the dredging application makes absolute measurement of the density,
velocity, solids flow, and total solids dredged, highly dependent on the
application and operating conditions. For this reason, it is EXTREMELY
IMPORTANT to read and understand the sections which follow, in order to
know, prior to installation, the advantages and limitations of the
equipment offered.
EQUIPMENT OFFERED
Texas Nuclear Type SGF Nuclear Density Gauges for on-line non-contacting
measurement of process fluid density. This gauge consists of an amplifier
indicator unit, to be located in the deck house, a radiation source assembly,
and a radiation detector. These latter two items are mounted by means of a
saddle on the process line.
Texas Nuclear Crossed Pointer Display for simultaneous display of the
density and velocity signals. This unit mounts near the lever man's station.
-1-
-------
The unique, multiple-scale display also indicates relative mass flow
rate by the intersection of the two pointers; this feature allows the
lever man to optimize throughput by operating for a maximum height of
the pointer intersection. The crossed pointer display unit also con-
tains a resettable totalizer for indication of solids moved.
Fgxboro Type 2800 Magnetic Flowtube and Foxboro Type £96 Magnetic
Flow Transmitter for measurement and transmission of process fluid
velocity. The flowtube is mounted in the process line and the flow
transmitter is usually located nearby. The flowtube will utilize an
oversize pipe lined to the inside diameter of the user's process line.
The lining is made considerably thicker than the flowmeter manufacturer's
standard, in order to provide improved life under harsh dredging con-
ditions. Because of the custom-fabricated nature of the flowtube, this
item is non-cancellable and non-returnable when purchased through
Texas Nuclear.
Foxboro Three-Channel Strip Chart Recorder (Production Recorder) for
indication and logging of the density, velocity and solids flow signal.
(Offered as an option.)
Texas Nuclear DC Heater Package (Optional) for battery operation of the
detector heater. This optional feature permits continued operation of
the heaters during shut-down of the main power on the dredge. It is gen-
erally required in applications where dredging operation is intermittent,
and where AC power is not available when the dredge is not operating. When
the DC heater package is used, it draws its operating power from the 24-volt
batteries used for starting of the dredge's diesel engines. The user should
assure that adequate battery capacity exists to maintain heater operation
extended periods, and to re-start the engines after those periods.
-------
SYSTEM PERFORMANCE
Overall system performance is subject to a number of variables. As out-
lined earlier, the density-mass flow system provides valuable feedback
to the operator as to the condition of density, velocity, and solids
production rate in the discharge line. However, the absolute accuracies
of the measurements involved are highly dependent on the particular
application. In order to understand the capabilities and limitations
of the system, it is important to understand how the density and velocity
measurements are accomplished.
The density measurement employs a gamma ray beam which passes from one
side of the pipe to the other, normally along a diameter of the pipe.
This beam is conical in shape starting at about one-inch in diameter on
the source size and diverging to three to six inches on the detector side.
The gauge provides an accurate average of the density of the material
which passes through this beam but does not "see" any of the material
not passing through the beam. Thus, the absolute accuracy of the density
gauge output depends on whether the relatively small sample of material
"seen" by the gauge is representative of all the material at that point
in the discharge pipe.
If one is dredging fine sand and maintaining a high slurry velocity, the
sand may be well enough distributed to make a density measurement with a
high degree of absolute accuracy. As the dredged material becomes more
coarse, it is no longer possible to maintain a uniform distribution,
particularly in a horizontal run of pipe. Under such conditions, the
absolute accuray of the density measurement will be deteriorated. Even
under these conditions, however, the density signal will provide a
qualitative indication of material density, and will still be a valuable
tool for maximizing solids production.
Similarly, inhomogeneous distribution of solids can also affect the output
of the magnetic flowmeter supplied with the Production Monitoring System.
The magnetic flowmeter is essentially a short section of pipe, lined with
polyurethane, and surrounded with field coils which produce a magnetic
field inside the pipe. When a conductor, such as the material flowing in
-3-
-------
the discharge pipe, moves through the magnetic field in the flow tube,
a small voltage is produced which is proportionaly to the average
velocity of the material in the pipe.
When solids slippage, i.e., a condition of water moving faster than
solids, occurs, the flowmeter output will indicate a velocity somewhere
between that of the solids and that of the water. This does not
diminish its value as a production monitoring device, and the flowmeter
will still provide fast indication of impending line plugs, thus pre-
venting costly downtime.
Many of the effects mentioned above can be minimized by properly locating
and orienting the nuclear density gauge and flowmeter in the discharge
line. Texas Nuclear has application engineers with considerable work
experience in this area.
-4-
-------
PERFORMANCE GUARANTEE
Texas Nuclear Density Gauge
Texas Nuclear verifies proper performance of its nuclear density gauge
with clear water in the pipe to establish a zero solids reference, and
by imposing known absorbers in the radiation beam to simulate a slurry
of homogeneous solids distribution at the typical dredge operating den-
sity level. Density gauge performance is based on these conditions:
Pipe I.D 20 inches
Pipe Wall Thickness 0.75 inches steel
Maximum Slurry Density 1.6 SGU*
Solids Density 2.6 SGU
Gauge Response Time Constant ... 5 seconds
Operating (Typical) Slurry
Density 1.2 SGU
Radiation Source Size Cesium 137
*Specific Gravity Units.
Under these conditions, we will guarantee precisions of:
+ SGU at 1.0 SGU (Clear Water)
+_ SGU at .005 SGU (Typical operating density simulated by
imposing absorbers in the radiation beam
with clear water flowing in the discharge
pipe.)
Foxboro Magnetic Flowmeter
The magnetic flowmeter is manufactured by the FoxboroCompany, Foxboro,
Massachusetts. All flowtubes are pressure tested and hydraulically
flow ca^Drated. A flow calibration data sheet is supplied with each
flowtube. The manufacturer's specifications are:
Accuracy: +1% of full scale
Precision: +0.25% of full scale
when operated at the conditions under which calibrated.
-5-
-------
Solids Flow
The solids flow signal is derived from the density and flow signals.
Proper operation of the solids flow rate and totalizing circuitry is
verified with a density signal which is produced with clear water in
the pipe and a known absorber in the radiation beam to simulate nominal
operating density. The flow signal is that produced by the flowmeter
with clear water in the pipe and with the pump being operated at con-
stant RPM. Under these conditions, we will demonstrate:
Solids flow indication: +5% of calculated value
Total solids indication: +5% of calculated value.
Crossed-Pointer Display
The Crossed-Pointer Dislay has an accuracy of +2% of full scale on the
velocity and density indications.
Strip Chart Recorder (Production Recorder)
The strip chart recorder has an accuracy of +_!« of scale on each of its
inputs.
-------
AUTOMATION PRODUCTS. INC.
MANUFACTURER OF INDUSTRIAL PROCESS INSTRUMENTS
TELEPHONE 17131 869-0361
3030 MAX ROY STREET, HOUSTON. TEXAS 77008
Amalgamated Dredge Design, Incorporated
856 Public Ledger Building
Philadelphia, Pennsylvania 19106
Attention: A. D. Manwell
Quotation No. 27-40119D
Date November 1, 1979
R.f.r.«c. Letter dated 9/14/79
10/16 Phone Conversat
Gentleman. W« are pleased to submit the following quotation for your consideration.
ITEM QUANTITY
DESCRIPTION
DELIVERY UNIT PRK
Type CL-10HY l£natror:Cell, Similar to Type CL-10TY
per Bull'etIn"'J-67b've"3rcept having Stainless Steel
U-Tube and connections per Drawing CL-10-216, sealed
construction, and Type EC-212GA-4 Converter having
4-20 MADC output signal into 0-650 ohms max.
SERVICE CONDITIONS:
10 Weeks
$3400,
Media
Classification
% Concentration
Pressure
Temperature
NOTES:
Slurry
0-40% Solids at 1.2
S.G.U.
Less Than 1000 psig
Ambient
- 1.6
With the above unit, accuracy of measurement would
be + .0005 S.G.U.
If media temperature compensation is required,
specify above Cell complete with integral
temperature compensation and Type EC-213GA-4
Converter in place of Type EC-212GA-4 Converter for
$300.00 extra net.
Above Converter is available with either 1-5 MADC
output into 0-2600 ohms max., or 10-50 MADC output
into 0-260 ohms max., at no additional charge.
When placing order, please advise complete service
conditions as outlined on the enclosed Quotation
Data Forms.
B FACTORY 0 HOUSTON. TEXAS
.MS. Vi% 10 DAYS NET 30 DAYS
'ECT TO CONDITIONS STATED ON REVERSE SIDE.
AUTOMATIOS! PRODUCTS. INC.
Bernie Hartman
Phone (713) 869-0361
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BULLETIN NO. J-67 DA
CL-10TY SERIES
AUTOMATION PRODUCTS, INC.
3030 MAX ROY STREET HOUSTON, TEXAS 77008 PHONE 713-869-0361
-------
CELL
MOUN ; ING DIMENSIONS MATCH
2 —600 IB ASA FLANGE
", NPT PROCESS CONNECTIONS
DOTTED LINES — TEMPERATURE
COMPENSATOR (WHEN REQUIRED)
CONVERTER
AUTOMATION PRODUCTS, INC.
3030 MAX ROY STREET HOUSTON, TEX AS 77008 PHONE 713-869-0361
-------
OYNATBCX'CeU.
!
RECORDER/CONTROLLER
' (USER FURNISHED)
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1vP'*T*e
CONVERTER
COMBO SERIES 200 GA
TEMPERATURE
ELEMENT OYNATROL* CELL
RECORDER/CONTROLLER
(USER FURNISHED)
CONVERTER
XDMBO SERIES 300 GA
CONVERTER
The output signal from the Dynatrol* Cell is fed into the all
solid state Converter where it is converted into a 4-20
MADC signal* compatible with 4-20 MADC* electronic
recorders and controllers. (*Other outputs are available,
such as 1-5 or 10-50 MADC, millivolt, or voltage outputs.
Contact factory for your special requirements.) The
Converter also contains a power supply which provides
regulated power to the Dynatrol*1 Cell.
Front panel Span and Zero controls are located at
the Converter where full scale output from the Converter
can be obtained for any 10% up to 100% of the Dynatrol*
Cell signal range.
TEMPERATURE COMPENSATION
Compensation for changes in process media density'due
to variations in process temperature can be provided.
Temperature compensation is accomplished through
circuitry in the Converter and through use of a tempera-
ture sensitive resistance element which is an integral part
of the U-Tube. Temperature Compensation cancels the
effect of temperature changes on density. This results in a
density measurement which has been corrected for
variations in process operating temperature.
Combo
Series
200 GA
300 GA
Function
Measures Density
at Process
Temperature
Measures Specific
Gravity Compensated
lor Changes in
Process temperature
Base Range
Any .5 SGU
Any .5 SGU
Span
Any
.05 to .5 SGU
within Base
Range
Any
.05 to .5 SGU
within Base
Range
Detector
Series
CL-10TY
CL-10TY
Converter
EC-212GA
EC-213GA
SPECIFICATIONS
DYNATROL* CELL, CL-10TY SERIES
Explosion Proof: Class 1. Group 0. Division 1
Pressure Rating: 1.000 PSIG @ 100*F. (Standard)*
Temperature Rating 300*F. (Standard)'
Process Connections: V*" NPT Male
Conduit Connection: v NPT
-natron Celts are also available for operation at elevated tempera-
M and pressures and for highly corrosive service*. Please
contact factory
CONVERTER, Type EC-212GA or EC-213GA
ALL SOLID STATE CIRCUITRY
Power Input: 118V. 60 Hz, 25 VA (SO Hz Available — Contact Factory)
Enclosure: General Purpose, Panel Mount. NEMA t (for remote
mounting)
Explosion Proof: Class 1, Group D. Division 2
Temperature Rating: 125T Max.
Span & Zero Suppression: Ad|ustable over base range of Cell
Output Signal: 4-10 MADC into 0-650 ohms max.
1 • 5 MADC into 0-2600 ohms max.
10-50 MADC into 0-260 ohms max.
NOTE: Millivolt and volt outputs are also Available where required. The
Dynatrol* Converter is normally grounded at recorder/controller, etc.
Floating output signals available (or computer Inputs, ate.
-------
DENSITY -SPECIFIC GRAVITY-% SOUDS CONTROL
FOR UQUIDS AND SLURRIES
PICKUP END
DRIVES END
GENERAL
Dynatrol' Systems are designed for measurement of density,
specific gravity, or °<> solids at process conditions. Response is
immediate and continuous. Dynatrol" Cells meet a wide range
of process requirements. They are applicable to both liquids and
slurries, are not sensitive to changes in ambient temperatures,
viscosity, pressure, or flow velocity.
The Dynatrol * is highly respected and relied upon by industry
and is a well proven, extremely versatile process tool.
Dynatrols '* are being utilized throughout the process industnes,
such as Chemical, Refineries, Pipelines, Oil Production,
Nuclear and Fossil Power Plants, Dairy, Water and Waste,
Brewing and Beverages, Pulp and Paper Kills, Mining,
Foods, Pharmaceutical, Sugar Factories, Steel, Textile,
Rubber, Tohacco, Manufacturing Plants, etc.
THE DYNATROL"- CELL (See Fig. 1)
The product to be measured flows through the U-Tube section.
This U-Tube is approximately W diameter and is welded at the
nodes.
The drive coil is electrically excited by a pulsating current
which drives the U-Tube into mechanical vibration. The vibration
becomes a (unction of the mass of the media contained in the
U-Tube. If the density or specific gravity of this media is
increased, the effective mass of the U-Tube increases; if the
media density decreases, the effective mass of the U-Tube
decreases.
This vibration is sensed in the pick-up end. The pick-up end
consists of an armature and coil arrangement which is similar to
that of the driver end. The vibration of the pick-up armature
induces an A-C voltage in the pick-up coil. This output from the
pick-up is a function of the density, specific gravity, or % solids of
the process media.
SERVICE CONDITIONS REQUIRED:
Media. Classification (Liquid. Pulp. Slurry), Density. Specific
Gravity, or •/<> Solids Range @ Process Temperature, Pressure,
Process Temperature, Temperature Venation. Whether Process
Temperature Compensation Required, Corrosive Condition.
NODE POINTS
DRIVE ARMATURE
FIG.1
CL-10TY SERIES DYNATROL® Cell
Patents Pending
ADVANTAGES: STABLE —ACCURATE —
EASILY INSTALLED — RUGGED
There are no moving parts to foul or wear out, resulting ir
long-term stability and nil maintenance requirements.
Dynatrol* Cells are easily installed, usually across a main lim
transfer pump with a small stream circulated through thi
U-Tube. They can also be installed across an orifice or othe
pressure drop point, or a small rectrculating pump may be used.
Output is linear and directly proportional to density o
specific gravity.
Dynatrol' Cells are available in a wide number of ranges tc
meet practically any application requirement.
A wide variety of corrosion resistant metals are available a:
required.
The Dynatrol * Cell is rugged, and has proven to be a unique
and versatile process tool throughout industry.
FIG. 2
CL-10TY SERIES
TYPICAL RESPONSE CURVES
•Shown below are just typical base ranges. Other base ranges and
broader ranges are available as requ/rad.
IUV
80
£ «
CC 40
20
0
/
/
/
(
A
/
)
i
/in
• /i i /. •
TYPICAL RANGES.
'
X
/
/
/
t
I
'
(
}
/
/
/
/
/
/
/
/
.500 1.000 1.500 2.000
Density in Specific Gravity Units (S.G.U.) Water- 1.00
-------
VIII. SAMPLING TECHNIQUE
-------
Sampling Technique
•
The proposed dredge test will take place in the zone of maximum turbidity. It
will be necessary, therefore, to establish background turbidity before commencing
dredging tests.
It is proposed that the sampling technique is based on a single sensing instru-
ment mounting in a sample receiving tank on the main deck of the dredge. This
tank would be hopper shaped fn the bottom for ease of washing out any deposits
of sediment and would be fitted with washing connections from the sampling pump.
The sampling pump would be a 3/8" bore water pump, preferably fitted with a
rubber or plastic impellar. A Jabsco Model No. 2187-1101 for 110 Volt DC
operation or Model No. 12210-0001 for 115 Volt AC operation, or similar, would
be suitable. If necessary, gasoline engine driven or low voltage versions of
these pumps are available. See attached leaflet.
On the suction side of the pump a manifold would be fitted having 13 3/8" valves,
of these 12 would connect to 3/8" bore nylon reinforced plastic sampling hoses.
The 13th valve would be a clean water suction, from a settling tank, if necessary,
for flushing out the sample receiving tank. The twelve sampling hoses, suitably
supported would pass down the suction frame to connect with the sampling pipes.
The sampling pipes would be 1/2" bore steel tubes, 5 foot and 7 foot long, de-
pending on their position and duty. A goal-post type gantry constructed of
standard slotted or drilled angle iron would be fitted across the upper surface
-------
of the dustpan head as shown in the attached sketch, Figure 1.
These sampling points would be used in the first instance to sample the
background turbidity.
The proposed initial sampling configuration is shown in Figure 2 with the
dustpan head maintained at a level of 6 feet above the depth shown on the
echo sounder.
The proposed second configuration is shown in Figure 3 with the bottom edge of
the dustpan head maintained at the depth shown on the echo sounder.
The final configuration shown fn Figure 4 would be used firstly at the same
depth as shown in Figure 3, whilst pumping water only, thereafter, pumping
mixture without movement of the dredge and finally during the'dredging trials.
The 3 spare sampling lines would be used either on the suction frame or
dredge hull as found necessary for sampling remote from the dustpan head.
-------
JABSCO FLEXIBLE IMPELLER PUMPS
Dronze Motor Pump Units
'SS
its 3
^"3
l/^HP.
?•••.
PUMP MODEL NO.
FLOW. 10 Ft. Head, H»0
PORT SIZE
VOLTAGE ' Amp Draw
IMPELLER
SHAFT SEAL
MOTOR SHAFT MATERAL
MOTOR TYPE
SIZE (Height x Width x Length)
WEIGHT (Approx.)
6360-0001
3. 7 GPM
V«" IPT/ V/' Garden
Hose Thread
12 Volt DC/6,5 Amps
Nitrite
Lip Type
Stainless Steel
Enclosed;
Permanent Magnet
3" x 4" x 63/i"
4Vi Ibs.
Varations Available
Model 6350-0001-6 Volt DC
Model 6370-0001-24 Volt DC
Model 6380-0001-32 Volt DC
Available Separately
Pump Head Only Nitrile 7440-0001
Note. Model 6360-0001 and variations are not designed
for reversing—always connect red lead to positive (+) side
of power source.
Head vs. Flow Table
6360-0001
TOTAL HEAD
PS!
Free Flow
2.1
4.3
8.7
FT. OF WATER
Free Flow
5
10
20
GPM
5.0
4.6
3.7
1.7
PUMP MODEL NO.
FLOW: 10 Ft. Head. H*O
PORT SIZE
VOLTAGE. 'Amp Draw
IMPELLER
SHAFT SEAL
MOTOR SHAFT MATERIAL
MOTOR TYPE
SIZE (Height x Width x Length)
WEIGHT (Approx.)
2187-1101
9.5 GPM
Vi" IPT/V/' Garden
Hose Thread
110 Volt DC/
2.8 Amps
Nitrile
Rotary Face Type
•Steel
Open, Drip proof-'/. HP
6W x6Vi" x 11V?"
38 Ibs.
Variations Available
Model 2187-0321-32 Volt DC
Available Separately
Neoprene impeller No. 2232-0001
Pump Head Only 4008-0003
'Seal and impeller ride on bronze shaft sleeve. Liquid
pumped does not contact motor shaft.
Head vs. Flow Table
2187-1101. 2187-0321
TOTAL HEAD
PSI
4.3
8.7
13.0
17.3
FT. OF WATER
10
20
30
40
GPM
9.5
7.6
6.0
4.2
For Metric conversion of flows and dimensions refer to Engineering Data.
Tables show approximate flow in U.S. Gallons Per Minute for a new
pump
-------
MARTEK MODEL XCVIS IN SITU
TRAftESMISSOMETER
MARTEK INSTRUMENTS. INC. MANUFACTURERS OF ENVIRONMENTAL INSTRUMENTATION
. . . for porublc field measurement:, of
beam attenuation coefficient "alpha" to 300 merer
clupths in salt or fresh water bodies.
DESIGN AND PERFORMANCE FEATURES
• Direct in situ operation — salt or fresh water bodies to
300 meters
• Fixed optical alignment.
• Temperature stable circuitry.
Light source electronically stabilized.
• Insentivity to ambient light.
• Portable operation from internal rechargeable batteries or
external 12 DC or AC power,
• Rapid simultaneous data readout and recording capabili-
ties.
• Adaptable to onshore and shipboard installations, pumped
sample systems, and industrial monitoring applications.
« Virtually no hysteresis effect in downwelling and up-
welling.
• Rugged marine construction for dependable field use.
INTRODUCTION
The Model XMS In Situ Transmissometer is a portable,
research-quality instrument specifically designed for optimum
underwater measurements of turbidity by determining the
percent transmission of a light beam through a known path
length in the water. It provides high accuracy, ±1.0% over a
wide alpha measurement range (0.1 to4.6 meters-1 for 1 meter
path length and 0.4 to 18.4 meter -1 for % meter path length).
State of the an electronic circuitry and a unique optical design,
originally developed at the Visibility Laboratory at Scripps
Institution of Oceanography, are combined with rugged pack-
aging for reliable use in water bodies by non-technical person-
nel. (0.1 to 4.6 meters —' is roughly equivalent to 0.1 to 6
JTU.)
DESCRIPTION
The Model XMS system consists of a solid state electronics deck
readout module with self-contained AC/DC power supply; up to
300 meters of multiconductor underwater cable with molded
waterproof connectors; and an underwater folded path one
meter or V» meter sensor with associated electronics and
waterproof connectors.
The optical system of the underwater sensor is different from a
colhmated system in that it produces a cylindrically limited
beam rather than a diverging collimated beam. By confining the
beam from the projector to a cylindrical volume and limiting
the field of view of the receiver to a cylinder closely matching
the illuminated volume, the error due to forward scattering is
reduced. A porro prism is used to fold the water path thus
shortening the instrument and making it more convenient to
handle. A blue green filter peaking at 493 millimicrons is
standard. Optional filters with peaks at 447. 528, 566 and 604
millimicrons are available.
The Transmissometer readout module is housed in a compact,
splashproof, steel carrying case with detachable lid and canted
control panel to permit moisture runoff and efficient viewing
angle. Readout of the light transmittance measurement is
obtained instantaneously on a high resolution, 1% mirrored
panel meter, with ranges of 0-10%, 0-25%, and 0-100%
Transmittance. A recorder output permits on-site or telemetry
recording of the percent transmission measurement. Continuous
records of percent transmission versus temperature and/or depth
may be obtained by using the optional Model TMS Temperature
Measuring System and/or Model DMS Depth Monitoring System
and X.X-Y type recorder.
APPLICATIONS
The Model XMS may be utilized for turbidity, productivity, and
sedimentary studies. The Transmissometer provides an accurate
and reliable means of determining one of the fundamental
optical properties of water, the beam attenuation coefficient*
Inasmuch as the coefficient O( is a determinant of water clarity,
it is used extensively in scheduling underwater photography,
television and diving operations. Marine biologists use the
Transmissometer as a plankton locater, since plankton absorbs
and scatters light which results in high attenuation and a
resultant high concentration of the organisms. Another applica-
tion is in the field of descriptive oceanography, where the
instrument can be used to study the distribution, both by area
and by depth, of scattering and absorbing layers in the oceans,
and for determining river outflows.
-------
-fl-
MODEL XMS SPECIFICATIONS
SYSTEM PERFORMANCE
Useful range of
alpha measurements:
Display Range:
Ambient Light
Interference:
0.1 to 4.6 meters 1 for 1 meter path
length and 0.4 to 18.4 meter -1 for
% meter path length.
0-10%. 0-25%, and 0-100%
transmittance.
Panel Meter:
Operating Temperature:
Operating Depth:
Negligible.
•2° to 40*C.
0- 300 meters.
Overall System Accuracy: i 1.0%
Operating Power: Regulated self-contained; 105 - 125
VAC (50/60 Hz) or 12 VDC primary
input. Internal, rechargeable battery
pack with built-in charging circuit
supplied as normal DC source.
Battery life 3 hours of continuous
system operation between charges.
Recorder Jack:
Controls:
Housing:
or
SYSTEM ASSEMBLIES
Sensor: Photometer with one meter
meter folded path length.
Fittings: Bulkhead type. 6 pin, plastic water-
proof connector (male) with locking
sleeve.
Dimensions: Approximately 8 inches diameter by
36 inches long for one meter and 8
inches x 20 inches long for % meter
sensor.
Weight: Approximately 36 pounds.
Readout Unit: Portable, self-contained deck readout
module with panel meter, controls,
ORDERING INFORMATION
DESCRIPTION
Construction:
Fittings:
Diameter:
Weight:
Breaking Strength:
power supply, recorder-output con-
nection, sensor-input receptacle, and
associated solid-state electronic cir-
cuitry for remote monitoring of
submerged sensor.
Precision (1%) taut-band type with
3.5-inch mirrored scale and knife-
edge dial-pointer; 0-1 milliampere
movement; moisture sealed; direct
reading scale of 0-10%, 0-25% and
0-100% Transmittance.
0 - 0.5 volt DC signal (full scale).
2 rotary switches. Power function:
OFF, AC, BATTERY, CHARGE.
Control function: CALIBRATE,
OPERATE.
Epoxy-coated steel carrying case
with removable panel cover; specially
treated aluminum control panel.
CABLE ASSEMBLY
12-conductor, waterproof, poly-
urethane jacket.
Input plug for readout unit,
molded underwater breakout with
sensor connectors.
0.5 inch
13 pounds/100 feet (excluding
fittings).
625 pounds approx. (100 foot
length).
PART NUMBER
300-XX
300 TMS
Model XMS In Situ Transmtssometer Monitoring System, including 300-10 Readout Moduit XMS
(m/carrying cm), 3OO-20 XMS Undtrwaier Senior, on* meter or % meter folded path iengtti —"<
fee: of cable
Same as Pan Number 300 but including Model TMS Temperature Monitoring System and feet of
cable.
300 DMS Same as Part Number 300 but including Model QMS Depth Monitoring System and .
. feet of cable.
300-E6T Same as Part Number 300 but including Model TMS Temperature and Model DMS Depth Monitoring
Systems and feet of cable.
Mote: XX Specify 100 for one meter cell path for clear and turbid waters and 25 for 25 cm cell path sensor for very turbid waters.
4H Dn:es f 0 B Irvine. Calilornia. including 12-month product warranty against delects in material and workmanship
/Prices ana specification* sut/ecf ro change without notice./
9 MARTEK INSTRUMENTS,INC.
173C2 DAIMLER STREET. IRVINE. CALIFORNIA 92713 PHONE (714) 540-4435 TELEX 692 317
PRINTED IN U.S.
-------
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-------
IX. DEPTH MEASUREMENT
-------
Depth Measurement
As the dredging test will be carried out in the zone of maximum turbidity, the
material to be dredged wfll probably exist in three states, i.e., Mobile
Suspensions - State Suspensions - and Settled Silt.
From laboratory studies using echo sounding techniques, it would appear that
densities lower than 1.19 ton/m are not easily detectable by the use of echo-
sounders. At this density the solids in suspension are of the order of 10*,
so the sampling pump should be capable of handling up to this concentration.
The results of the laboratory tests are shown in Figure 1 where the depth
soundings given by 200 kHz and 30 kHz echosounders and a standard leadline
are illustrated.
If we assume that all concentration higher than 1.28 (approx. 80 Ibs/cubic foot)
are settled silt, then a dual frequency echo-sounder, supplemented by the
sampling pump, should delineate the density profile of the material and ensure
KaM\
that the submersion of the dredging»in material is sufficient to ensure an
adequate clean-up of the cut without spill over the head due to over submersion
or too great a speed of advance.
Attached are descriptive brochures of suitable equipment.
-------
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-------
EP E904 ITT DECCA MARINE, INC.
TELEPHONE 904-445-2400 ' US RT1 i ST JOE ROAD - PO BOX G
TWX 810-324-2069 TELEX 564364 PALM COAST FLORIDA 32037
November 6, 1979
Amalgamated Dredge Design, Inc. ,
856 Public Ledger Building
Phi ladelphia, PA .,.,," i
Attention: Mr. A. D. Manwel1
Dear Sir:
We are pleased to quote you as follows on I DM Quotation No. 75 for the
high-frequency depth sounder system you are interested in:
To meet your specifications we would like to recommend the following choices:
1. LAZ 72/LVG59 with transducers LSE 132/1kQ for dual frequencies
of 30 KHZ and 200 KHZ. or
2. LAZ 72/LVG59 with transducers LSE 133/1^0 for dual frequency of
50 KHZ and 200 KHZ.
Specifications are:
1. Min sounding distance below transducer 10 CM (V)
2. Smallest range on recorder 20 meters (65.61)
3. Width of paper 228.6 NM (9")
k. Pulse frequency 30 and 200 KHZ or 50 and 200 KHZ.
5. Output power for 30 or 50 KHZ 1»50 Watts
6. Output power for 200 KHZ 40 Watts
7. Pulse length for 30 and 50 KHZ .3, 1 or 3 millisec. switchable.
8. Pulse length for 200 KHZ 50 Micro seconds.
9. Bandwidth for 30 and 50 KHZ is 1 and 3 KHZ switchable.
10. Bandwidth for 200 KHZ is 30 to kO KHZ.
Continued...
-------
Amalgamated Dredge Design, Inc.
November 6, 19?9
Quote No. 75
PRICES
1. 1 ea. LA2 72 AT Echograph with PGN 25-^*50 Watt Output 30 KHZ or
50 KHZ
PRICE $ 7,305.00
2. 1 ea. LVG 59 Transceiver 200 KHZ - kQ watt output PRICE S A, 770. 00
3. 1 ea. LSE 132 30 KHZ transducer for Steel Hull ship or
1 ea. LSE 133 50 KHZ transducer for Steel Hull ship
RR|CE $ ]
*». 1 ea. LSE 140 200 KHZ transducer for Steel Hull ship PRICE $ 1,^75.00
If distance between transducer and echograph is more than 10 meters you will
have to add connection Box VK10. The same applies for distance between LVG 59
and transducer LSE
VK 10 PRICE $ 55.00
Brochures on the LAZ 72 and optional accessories will follow by mail and
will include:
DAZ 6 Digital depth indicator PRICE $ 7,095.00
DAZ 8 Digital control unit PRICE S 3,600.00
DSG 8 Display Selector PRICE $ 6,890.00
TERMS & CONDITIONS
1. Prices are U.S. List, F.O.B. Palm Coast, Florida.
2. Delivery 60 days after receipt of order.
3. Prices are firm for deliveries prior to December 31, 1979. For later
delivery, price at time of delivery prevails.
b. This quotation is valid until December 6, 1979.
We appreciate your interest in our products and would like to take this
opportunity to thank you.
S ince-rely ,
ITT DECCA MARINE-v INC.
Paul H. Bl igh /\
Manager °
Sales Admi nistrat ion
PHBrdf
-------
MJRING SYSTCMS, me.
Om Battery Pirt Pl«». New Ywt, N.Y.10004 . Tel: (212)425-7900 . Tiler 22-2028 . Cable: Eleertft. N.Y.
November 20, 1979
Our Reference 462/79
Amalgamated Dredge Design, Inc.
856 Public Ledger Building fv.
Philadelphia, PA. 19106 KUV
ATT: Mr. A. D. Manwell AMALGAMATED DREDGE DES1B*
Gentlemen:
We have contacted various manutacturers in regard to your
echo sounder requirements mentioned in your letter of October 26.
We believe that the Dual Frequency Echo Sounder System,
Model FE-824 will fulfill your requirements. Furuno Electric Co.
Ltd. is a leader in the echo sounder/sonar tieid, witft equipment
in service world wide.
Quotation Number 1808
Item 1. Furuno Dual Frequency t.cho Sounder Model FE-824
- available as wet or dry paper recorder
- 2 Kw transmitter power, witn power reduction
control
- three pulse lengths - swi tenable
- Variable paper speed
- seven different depth models available
- five frequency combinations available
15 and 200 KHz
15 and 50 KHz
28 and 200 Kuz
50 and 200 KHz
28 and 50 KHz
- optional EM-1 scale expander, ES-5 memo-scope and
Ei>-202 digital unit can be added with ease
- whiteline and TVG controls
- display modes include:
(a) normal recording at high frequency over full
8 inches
(b) normal recording at low frequency over full
8 inches
(,c) normal recordings at both trequencies simultaneously
(top half and oottom nali of paper)
(d) combined recording over full 8 inches using nign
frequency until white line signal is detected then
automatically switching to low frequency, giving
A MEMBER OF THE ARNESSEN CORPORATION GROUP
-------
. November 20, 1979
s SYSTGMS. inc. Page - 2 -
(d; con't.
high frequency fish recordings for best definition
and low frequency bottom recordings tor best ground
discrimination.
FE-D824 (Dry i»aper) or FE-W824 (Vet Paper; - all deptn variations
Prices:
15 and 200 Khz with 15F-4 and 200 B-8 transducers $ 6,500.00
15 and 50 KHz with 15F-4 and 50B-12 transducers $ 6,675.00
28 and 200 KHz with 28F-18 and 200 B-8 transducers $ 6,550.00
50 and 20u KHz with 5UB-12 and 2uO B-8 transducers $ 6,195.00
28 and 50 KHz witn 28l-'-18 and 50B-12 transducers $ 6,695.00
Recorder only (all frequency combinations) $ 5,725.00
Item 2. Memo-Scope ES-5, CRT echo magnifier with memory, including:
(a) tfive expanded depth ranges 2.5 to 60 fathoms
(b; Swing or differential display
(c) Bottom lock
(d) Range Spread
(e) Surface lock
(f) Recorder Interface Kit
(g) Operation from 12/24/32 V DC 110/220 v AC
Price Each $ 3,495 .00
Item 3. mMl Scale Expander (memo-graph; with:
(a) bottom IOCK.
(t>) Range Spread
(c) Surface lock
(d) *'ive expansion ranges
(e; Marker lines
(f) Interface Kit
••«•*_»_ ~ -• H M MM •••«•« _IIL _ ™»TT Jj) J j J^i J • UU
Item 4. Digital Depth Indicator ED-202, with:
(.a) Three digit readout (feet, fathoms or meters)
^b) Depth alarm
(c) Recorder interface kit
(d) operation from 110/220 V AC
Alternatively,
Item 5. Paragon "3-D" Digital Depth Display.
-------
November .20, 1979
S SYSTCMS, me. Page - 3 -
Tnis indicator unit can interface with any standard recorder,
and provides a Solid-State digital readout. The unit has its own
receiver and acts independently upon the returned signal iron the main
unit's transmitter. Range capability to 999 fathoms, variable deptn
alarm to 90 fathoms.
Price Each $ 474.UO
Validity: 60 days from date
Prices: F.O.B. ban Francisco, California
Delivery: 30 days from contract
Terms : 30 days net.
Sincerely,
ARwESSEN MARINE SYSTEMS, INC.
•" Stepnen P. Keller
Manager
Communications and
Navigation Systems
sPK/dh
-------
Super Quality Series -
MODEL FE-824
® The future today with FURUNO's electronics technology.
FURUNO ELECTRIC CO. LTD.
9 52, Ashihara cho, Nishinomiyo City, Japan
Cable- FURUNO NISHINOMIYA, Telex: 5544-325
Catalogue No. E-2G-
THADE
-------
FURUNO ELECTRIC CO., LTD.
NISHINOMIYA JAPAN
SPECIFICATIONS OF FE-824
A
B
C
D
E
F
G
DEPTH
SINGLE FREQUENCY
(110- 60, 30- 90, 60- 120, 90- 150m
(2)0- 120. 60- 180. 120- 240. 180- 300m
(3)0- 240.120- 360. 240- 480. 360- 600m
14)0- 480.240- 720, 480- 960, 720- 1200m
(1)0- 80. 40- 120, 80- 160, 120- 200m
(2)0- 160. 80- 240. 160- 320. 240- 400m
13) 0- 320,160- 480, 320- 640. 480- 800m
(4)0- 640,320- 960, 640-1280, 960 -t 600m
(110- 100. 50- 150, 100- 200. 150- 250m
(2)0- 200.100- 300, 200- 400. 300- 500m
(31 0- 400. 200- 600. 400- 800. 600-IOOOm
(4)0- 800.400-1200, 800-1600, 1200-2000m
(1)0- 120. 60- 180, 120- 240. 180- 300m
(2)0- 240,120- 360, 240- 480. 360- 600m
(3(0- 480.240- 720, 480- 960, 720-1200m
(4)0- 960.480-1440. 960-1920 1440 -2400m
11)0- 160, 80- 240. 160- 320, 240- 400m
(2) 0- 320. 16&- 480. 320- 640. 480- 800m
(3)0- 640.320- 960, 640-1280, 960 -1600m
(41 0-1280.640-1920. 1280-2560. 1920-3200m
(110- 200, 100- 300, 200- 400. 300- 500m
(210- 400,200- 600, 400- 800. 600-IOOOm
13)0- 800,400-1200, 800-1600, 1200-2000m
(4) 0-1600, 800-2400, 1600-3200, 2400-4000m
11)0- 240,120- 360, 240- 480. 360- 600m
(2)0- 480.240- 720. 480- 960, 720-1200m
(3)0- 960,480-1440, 960-1920, 1440 -2400m
(41 0- 1920. 960-28SO. 1920-3840. 2880 -4800m
RANGES
DUAL FREQUENCIES
(11 0- 30. 30- 60. 60- 90, 90- 120m
(2)0- 60, 60- 120, 120- 180. 180- 240m
(310-120.120- 240. 240- 360. 360- 480m
(410-240,240- 480. 480- 720. 720- 960m
(1)0- 40, 40- 80. 80- 120. 120- 160m
(2)0- 80, 80- 160, 160- 240, 240- 320m
(3)0-160,160- 320. 320- 480, 480- 640m
(4)0-320.320- 640, 640- 960, 960-1280m
(1)0- 50, 50- 100, 100- 150, 150- 200m
(2)0-100,100- 200, 200- 300, 300- 400m
(3) 0-200, 200- 400, 400- 600, 600- 800m
(4)0-400.400-800. 800-1200, 1200- 1600m
(110- 60. 60- 120, 120- 180. 180- 240m
(2)0-120.120- 240, 240- 360, 360- 480m
(3) 0-240. 240- 480. 480- 720, 720- 960m
14)0-480.480-960. 960-1440. 1440- 1920m
(1)0- 80, 80- 160, 160- 240, 240- 320m
(2)0-160,160- 320. 320- 480, 480- 640m
(3)0-320.320- 640, 640- 960. 960-1280m
(410-640.640-1280, 1280-1920, 1920-2S60m
(1)0-100,100- 200, 200- 300. 300- 400m
(2) 0-200. 200- 400. 400- 600. 600- 800m
(3)0-400.400- 800, 800-1200. 1200-1600m
(41 0-800, 800-1600. 1600-2400. 2400- 3200m
(1)0-120,120- 240. 240- 360, 360- 480m
(2)0-240,240- 480, 480- 720, 720- 960m
13)0-480,480- 960. 960- 1440, 1440- 1920m
14)0-960,960-1920, 1920-2880. 2880-3840m
TX RATES
(ppml*
196
98
25
148
74
37
19
118
59
30
15
98
49
25
13
74
37
19
10
59
30
15
8
49
25
13
7
PAPER SPEED
(mm/mini ••
47-28
2.4 - 14
1.2- 7
0.6- 3.5
3.5-21
1.8- 10.5
0.9 - 5.3
0.5- 2.7
2.8 - 16.8
1.4- 8.4
0.7 - 4.2
0.4- 2.1
2.4- 14
1.2- 7
0.6- 3.5
0.3- 1.8
1.8 - 10.5
0.9 - 5.3
0.5 - 2.7
0.3- 1.3
1 4 - 84
0.7 - 4.2
0.4 - 2.1
0.2 - 11
1.2- 7
0.6 - 3.5
0.3 - 1 .6
0.2 - 0.9
Fathom Scales
available (Example AF, BF, •
* Sounding rates are shown for metric scales.
For fathomic scales, multiply by 2/1.83.
RECORDING PAPER
FE-D824: Dry Paper PD-2020(204mm x 20m)
FE-W824. Wet Paper PW-2015(200mm x 15m)
OUTPUT POWER
2KW with continuous reduction
PULSE LENGTH
0.6. 1.2 and 1.8ms switchable (each for frequency)
FREQUENCY and MAXIMUM DETECTION (GUIDANCE ONLY)
"Shown are for dry paper recorder.
In wet paper recorder, minimum speeds are twice higher.
EM-1 MEMO-GRAPH
Expands water segment of 7 5, 15, 30. 60 or 120m in
surface-lock, pelagic or bottom-lock mode.
ES-5 MEMO-SCOPE
Non-flickering visual display of expanded water segment
anywhere within the fisn finder detection range.
ED-202 DIGITAL INDICATOR
Direct read out of water depths. Reliable by digital
signal processing. Alarms for preset depth.
FREQ
15KHz
28KHz
50KHz
60KHz
88KHz
200KHz
XDR
TYPE
15F-4
28F-18
508-12
608-55
888-10
2008-8
BEAMWIDTH
(3dB)
31 x 78°
22 circular
12 circular
10 circular
10 circular
5 4 circular
Singl* Fish C
3O em
(TS:-30dBI
160m
280
380
380
280
200
>et*ction(m)
70cm
(TS:-15dB)
310m
560
600
580
420
280
S*ab*d :
3550m
2900
2100
2000
1400
630
(Power 2 kW)
POWER SUPPLY
DC24/32V. 1 SOW or
AC110/220V, 50-60HZ. 100VA
OPTIONS
TRANSDUCER TANK
HIGH POWER TRANSMITTER (5. 10 or 30KW)
SorlOKW: 15, 28 or 50KHz
30KW 15 or 28KHz
DC24/32VOR _
AC 110/220V 50/SOHi
OPTIONS (EM 1.ES5. E0202)
TRANSDUCERS
wan ISmcjeir
SPECIFICATIONS SUBJECT TO CHANGE FOR IMPROVEMENT
FOR FURTHER INFORMATION,
PLEASE CONTACT
FOR DETAILED INFORMATION PLEASE CALL I
-------
CHOICE OF SINGLE OR DUAL FREQUENCY OPERATION
High Frequency
1. Good for small fish detec-
tion (A)
2. Fish spotted in high intensity
(Bl (darker marking)
3. Immune to surface contami-
nation (cf. C & C')
4. Clear recording of pinnacles
by a sharp beam (D)
Low Frequency
1. Wide beam facilitates to dis-
tinguish single* fish (E).
2. Greater coverage by a wide
beam width
3. Less attenuation to deeper
ranges.
4. Reliable white line function
in deep ranges.
5. Less effect by pitch and roll.
Upper. 200KHz Lower: 15KHz
POWERFUL, 16 RANGES
Choice of 16 depth settings (4
basic and 4 phased on each
basic range) permits greater
precision in locating fish at any
depth.
Built-in 2KW transmitter with
continuous reduction ensures
detection and resolution.
WHITE LINE
White line facilitates detecting fish
schools near or in contact with the
seabed. Setting the control at high
level will give the white line effect
on fish schools, too, enabling an
estimation of their density • more
effect on higher density.
C
GROUND DISCRIMINATION
The high frequency provides
high definition of bottom
contour while the low frequen-
cy presents better ground
discrimination by making
bottom trailing longer at hard
parts. This recorder has a spe-
cial feature to give excellent
ground discrimination by
emitting two frequencies simul-
taneously. The high frequency
amplifier serves to record fish
and bottom contour, and
to * H, i u,wh,te switches to the low frequency
""it* Lint Line Qrf *
°* ! amplifier upon detection of the
white line signal.
TVG(Time Varied Gain)
PULSE LENGTH SELECTION
TVG compensates for pro-
pagation attenuation of ultra-
sonic waves by reducing the
receiver gam near surface and
gradually increasing the gain
toward deeper range.
Recording intensity is equalized
for the same size fish schools
at shallow and deep ranges. It
also shows up fish in surface,
noise and plankton. Better to
0.6 mice. 1.2 cnvc.
1.8 msec.
Pulse length can be select-
ed in 3 ways. Vertical
resolution is theoretically
explained by (Sound ve-
locity) x (Pulse length)/2.
For the shortest pulse of
0.6 msec, the resolution is
45 cm (disregarding the
transducer damping pro-
perty and pulse elongation
during propagation). The
short pulse gives detailed
information and the long
pulse ensures ample detec-
tion in deeper ranges.
ECHOGRAM MAGNIFIER
MEMO-GRAPH EM-1 (OPTION)
Expands a water segment
anywhere within the normal
recording range. Clearly shows
up scattered or small fish
schools which are not visible
on the normal record.
EXPANSION
-------
• High sensitivity ... low noise, wide dynamic range amplifier o Powerful . .. built-in
2KW solid-state transmitters for two frequencies • Time varied gain . . . adjustable
in time (depth) and level • 3 pulse lengths o Choice of single or dual frequencies
• Dry or wet paper (FE-D824 or FE-W824) • Compact and splashproof • Standard-
ized printed circuit boards and modular assemblies, common to the various new-series
models • Special ground discrimination technique.
Coarse Gain (Lo/Md/Hi)
Internal Controls
Power Reduction,
Pulse Length,
Paper Speed,
Zero Line Shift,
TVG Time (on circuit
board)
Phased
Range Selector
Basic
Range Selector
Freq. Selector
/ From top; Hi, Hi & Lo,
f Hi & Lo Ground
\Discrimination, Lo.
The FE-824 is one of the Series-8 ftsh finders newly
developed through FURUNO's advanced electronic tech-
nology. All Series 8 fish finders are engineered to the highest
standards for severe marine environments, using standardized
modules and sub-assemblies.
The equipment consists of a recorder unit and two
transducers. The recorder incorporates the receivers, 2KW
transmitters and control facilities for two frequencies,
all in a rugged cast aluminum cabinet.
The recorder is available with either dry paper or wet
paper. The 200mm (8-inch) wide paper gives detailed
information of fish schools and seabed.
Dual frequency system increases flexibility of operation.
The high frequency is suitable for detecting Spanish mackerel,
squids and other small fishes. It is also suited for trap fishing.
The low frequency provides reliable sounding in deep waters.
Because of different beamwidths and reflecting properties
of two frequencies, it is even easier to appreciate fish amount
and species.
The circuitry is fully solid-state for high reliability,
segmented into pulg-in units for easy maintenance.
For avid fishermen, echogram magnifier EM-1, memo-
scope ES-5 and digital depth indicator E0-202 are optionally
available to greatly increase the function of the basic
fish finder.
-------
X. TEST NO. 1
-------
Test No. 1
Water Test
Condition: Dredge ready for work
Dustpan head fitted in agreed configuration
Orifice fitted in pipeline
Mercury manometer across orifice
Temporary valve fitted at stern swivel
Readings to be taken:
Pump vacuum gauge (Calibrated)
Pump pressure gauge (Calibrated)
Pipeline guages (2 off) (Calibrated)
Orifice manometer
Diesel engine fuel rack - Exhaust Pyrometers
or .Electric motor voltage and amperage
Velocity meter (If fitted)
Water density
Procedure:
(1) Run up pump engine to full speed against 1/4 open valve.
Continue running for 30 minutes.
(2) Gradually open valve until engine reaches full load.
Set of reading taken after 20 minutes on full load.
-------
(3) Close valve to give pipeline* speed of approximately 18
feet per second. Set of readings after 20 minutes.
(4) Close valve to give pipeline speed of approximately 14 feet
per second. Set of readings after 20 minutes.
(5) Close valve to give pipeline speed of approximately 10
feet per second. Set of readings after 20 minutes.
(6) Close valve to give pipeline speed of approximately 6 feet
per second. Set of readings after 20 minutes.
(7) Close valve completely. Set of readings after 3 minutes.
Repeat procedures (2) to (6) in reverse order.
Run at procedure (2) for 4 hours.
Set of readings every 15 minutes.
Close examination of bearings glands, etc., for overheating,
leakage, etc., during this period.
Carry out any adjustments found to be necessary.
After adjustments, if any, run at full load for one hour.
Pumping installation is now ready for dredging tests.
-------
XI. DREDGING TESTS
-------
Dredging Tests
As the cutter suction dredge will be in the dustpan mode, the following
will be the variables tested: -
(a) Suction pipe velocity
(b) Immersion of head in material
(c) Speed of advance through the material
The instrumentation fitted will record output but the main parameter
to be considered in the initial dredging test is pipeline density.
Until tests and modifications show that no further progress is possible, the
ultimate aim of Phase One of dredging must be maximum density with the
minimum turbidity.
Thereafter in Phase Two of dredging, the object must be to maximise output
without reducing the standards of output and density attained in Phase One.
-------
XII. ADAPTION OF DUSTPAN HEAD
-------
Adaption of Dustpan Head
As an existing dustpan head is specified for the initial test, the main
constructional problem is adapting an existing cutter suction dredge to take
the dustpan head with the minimum of structural alterations. The simplest
method of attaching the dustpan head to the ladder of the cutter suction dredge
is to remove the cutter,lay the dustpan head on top of the ladder, introduce
some supporting steelwork and weld and bracket to give an attachment strong
enough to adequately support the dustpan head and also resist the digging and
anchoring loads.
This exercise is shown in Figs, la - IB - Ic. This arrangement is satisfactory
in the sense that the attitude of the head to the ground is satisfactory for
silt dredging and there fs adequate ground clearance between the suction ladder
and the material being dredged.
However, examination of the loadings Involved demonstrated that: -
(a) The normal cutter suction dredge mode has the following loading:
(1) Ladder up - Pipe Empty - Load on Wires 20.41 tons
(2) Ladder up - Pipe Choked - Load on Wires 23.58 tons
(.b) Dustpan head fitted as shown in Figs, la - Ib - Ic
(.1) Ladder up - Pipe Empty - Load on Wires 43.4 tons
(2) Ladder up - Pipe Choked - Load on Wires 50.92 tons
-------
The obvious alteration from Fig. 1 to Fig. 2 was to move the dustpan head rear-
wards as far as possible to reduce the load on the hoist gear. Unfortunately,
although this is the best arrangement from a structural point of view, the
suction ladder fouls the ground at the minimum and maximum depths envisioned
in the study.
For this reason the arrangement shown in Figs. 2a - 2b - 2c is no longer being
considered.
The final arrangement of the dustpan head is as shown in Figs. 3a and 3b. This
arrangement requires a more complicated supporting structure and requires two
more bends in the suction system.
(c) Examination of the hoist wire loadings in this position give the
following:
(1) Ladder up - Pipe Empty - Load on Wires 37.67 tons
(.2) Ladder up - Pipe Choked - Load on Wires 44.43 tons
(d) From the above it is obvious that in the best position, i.e.,
the 45° position shown in Figure 3a - 3b, the overload from the
normal cutter suction dredge is as follows:
(1) Ladder up - Pipe Empty - Overload 184.5%
(2) Ladder Up - Pipe Choked - Overload 188.4%
These figures apply to the ""known" dredge but will Be indicative of any cutter
suction dredge. As the indication fs that the safety factor of the hoist
gantry, hoist gear and hoist winch will be almost halved, then a very
-------
detailed analysis of all the involved components in the selected dredge will
be required before finalising the choice of dredge.
Taking into account the very high extra loadings involved, it is obvious that
the test dredge must be selected with reference to the hoist components, in
order to avoid the very expensive procedure of upgrading the hoist components
to take care of the extra loading.
-------
Fig. IQ.
Suction Frame Gantry
Existing Dustpan head.
Suction frame
Profile
(frame in stowed posn.)
Amalgamated Or*dot D»»ion Inc.
-------
Clearance at
I9ft.d.d
~7^~^ ///'
Profile
(at25ft.dredging depth.)
Amalgamated Dr«dg« P««lqn Inc.
-------
Fig. Ic.
Existing Dustpan h«ad.
Plon View
(frame In raised potnJ
Amalgamated Dr«dg« Design Inc.
-------
Flg.2c.
Existing Dustpan head
Area of Interference
Profile
(at 19ft. dd.)
Amalgamated Dr«dq« 0«§!jn
-------
Fig.Zb.
Existing Dustpan head
Area of Interference
Profile
(otZSft.d.d.)
-------
Rq.2c.
Existing Dustpan head
Plan View
(from* in raised po»n.)
Amalgamated Dr»da« Deslon Inc.
-------
Fig.3g.
Existing Dustpan head
Profile
(ot I9ft d.d.)
Amolaomatcd Drtdgt D««lon Inc.
-------
Qg.Sb.
Existing Dustpan h»ad-
Profile
(ot25ft.d.d.)
Amaioomated Oredg* D««Jgn Inc.
-------
AMALGAMATED DREDGE DESIGN, INCORPORATED
856 PUBLIC LEDGER BUILDING • PHILADELPHIA. PENNSYLVANIA
(215) 925-8794 • Telex: 845182 DREDGE DES PHA, 19106
February 6, 1980
Mr. Frank T. Wootton
Chief, Water Resources Planning Branch
United States Army Engineering District Norfolk
Corps of Engineers
803 Front Street
Norfolk, VA 23510
Dear Sir,
Demonstration Project in James River, Virginia
Further to our preliminary Phase I Report of December 7, 1979, we now enclose
for your perusal Addendum No. 1, based upon the proposed dredge ''ESSEX."
Additional copies of this addendum will be made available for circulation at our
meeting in Norfolk, now scheduled for Feb. 20.
Also enclosed for your attention is our "Initial Cost Estimate" for the demon-
stration test; and based upon modification to the dustpan head of the A.C.O.E.
dredge "KENNEDY" as well as to the cutter dredge "ESSEX" to accomodate this head.
Additional copies of this cost estimate will again be made available for
distribution at your discretion.
Finally, and for further discussion betv/een ourselves, we have included a
Proposed Scope of Work for A.D.D, in Phase 2 - the designing and planning
phase leading up to the commencement of the test itself at the commencement of
fiscal year 1981.
Trusting you find this to be in order, I remain,
Yours sincerely,
Alexander E. isett
Executive Vice-President
:kmc
Enclosure(s)
-------
CONTENTS
Paper No 1 : Phase 1 Addendum No. i
No 2 : Dredging Test: Initial Cost Estimate
No 3 : Points for Discussion
No 4 : Phase 2 - Proposed Scope of Work
TSD D2€DQc
-c
-------
PHASE 1 ADDENDUM NO. 1
-------
PHASE 1 - JAMES RP'ER PROJECT: ADDENDU!1, NO. 1
The Dredge
Following the submission, on December 7, 1979, of the preliminary Phase 1
Report, wherein reference was made to a "known" dredge for illustration purposes
a further visit was made to Norfolk District to meet with local dredging
contractors; namely, Atkinson Dredging Company and Norfolk Dredging Company,
with a view to locating a suitable cutterhead dredge within the area; capable
of being modified to carry the dustpan head as anticipated in the final test .
programme.
Just such a dredge would appear to exist in the "ESSEX", an 18" pipeline
dredge, built in 1978, and owned and operated by Norfolk Dredging Cnpany.
Initial investigation would appear to suggest that this dredge would be
eminently suitable foi the task envisaged; however, prudence dictates that the
"ESSEX" should be inspected on location in order to confirm this.
Furthermore, and after study of the proposed dustpan head on location at ^
the A.C.O.E. jetty in St. Louis, it would appear that such a conversion could
well be effected with the minimum of modification to both the dustpan head and
its ladder (of the A.C.O.E. dredge "KENNEDY") as well as to the dredge "ESSEX"
itself.
Details of the "ESSEX" appear on the following page. All references to the
"known" dredge within the Phase I Report sho"ld therefore be corrected on the
basis of this information.
-------
f\ ^ \
A^:^AJV
l^^sEiSKSES^Maf1-"* i ~T1/M
tens^^Cte^
I' * : -aV -'•*'/-/ S. "?'"*•:- 'V'"o-,':' •"
fi-ttcrhead Dredqe "USSE
"
'photo: courtesy of Norfc1k Dredqinq Co.
CUTTERHEVO PR
• ]>>ci|>al Characteristics
TSSFV"
" .} • - Lenqth
Breadth
Depth
'. it tor Power
"'i >',!qi nq Depth
: ; : iize
Power
: > .er & Swim; .•.I
140"-0"
10' -'j1
30'J hi).
40' -0" (ri( sinned r •"' -f'1" i
?r x r;
r?[)0 h.p.
75 h.n. ^ 'M'i r.i;.i".
25,000 Ib. S.L.P. ^ e-.l f .p.pi.
{tvised on 2nd wrap of 1" dia
and 400 )-[•,'. of loutor •
t'.V barrel dias.
-------
Manoevring/Anchor Wires
No problem is foreseen at this stage in adapting the swing winch barrels
of the dredge "ESSEX" to accomodate the headwires of the "modified dustpan"
dredge: at present the "ESSEX" operates with 600 ft. of 1 1/8" dia. wire
rope, with a barrel capacity of even greater.
As was previously stated, the headwires of a dustpan dredge are designed to
resist the combined pressures of wind and current resistance on the dredge
hull as well as the pull required to force the dustpan head into the material.
Modified graphs for both wind and current resistance, based on the dredge
"ESSEX", are therefore appended hereto.
If we ?re to assume the same "head" force as previously, i.e., 0.5 ton,
and the dredge operating against the same river current of 3 knots and a
wind speed of 19 knots, then the total combined load would be 3.05 tons
for tiie dredge "ESSEX."
This would then provide, on the basis of V1 6/37 construction headwires, a
safety factor of 5.14 assuming two such wires; and 2.57 with only one wire.
Reference in the earlier Report was made to the necessity of the dustpan dredge,
when operating during flood tide, to be equipped with a stern anchor. On a
modified "ESSEX" this would be achieved by utilising the anchor boom barrels of
the forward winch and running the wire aft to a convenient point.
-------
a
i—
\
\
-------
O
O- &
O
- -\
x
"
'. L—_
-t
\
IH
i ix
:_. _) __
-| ,_
-------
s
I.
k
I,
Q
O
4 K
HOTS
W'INP SPEEP-KNOTS
i-
-------
January 1980
EVALUATION OF MAINTENANCE PROJECT
JAMES RIVER NORFOLK
DREDGING TEST
INITIAL COST ESTIMATE
Copy No. 4 of 18 Copies
-------
Estimate
Items 1-10 Inclusive 5-2,052,600
Items 11-19 Inclusive 315,000
Iteivs 20-24 Inclusive Not Quantified
rOTAL $2,367,600
-------
Page 2
ESTIMATE SUMMARY
tern
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Month 1 Month 2 Month 3 Month 4 Month 5 Month 6
50,900 173,400 173,400 173,400 173,400 50,900
17,300 17,300 17,300 17,300
61,600 61,600 61,600 61,600
12,200 12,200 12,200 12,200
15,000 15,000 15,000 15,000
38,400 38,400 38,400 38,400
80,000 80,000 80,000 80,000 80,000 80,000
14,400 14,400 14,400 14,400
14,000 14,000 14,000 14,000 14,000 14,000
14,400 14,400 14,000 14,000
1-10 Sub-Total
Transport frorr St. Louis Ladder & Suction Head & Fairleads
Removal o* Ladder from Dredge "Essex"
Mobilization of Dredge "Essex"
Adaption of " KENNEDY " Ladder & Fairleads
Installation of " KENNEDY " Ladder & Fairleads
Testing Equipment
Installation of Test Equipment
Installation of Wire Ropes, Anchors, etc.
Cost of Wire Ropes, Anchors, etc.
11 - 19 Sub-Total
Total
795,400
69,200
246,400
48,800
60,000
153,600
480,000
57,600
84,OCO
57,600
$ 2,052,600
35,000
20,000
100,000
35,000
20,000
70,000
10,000
5,000
20,000
$ 315,000
(Continued)
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Page 3
The following not quantified
20 Contingency allowance
21 Insurance not included in rental costs
22 ACOE personnel and services other than 4 recorders
23 "Other" personnel and Cervices other than 4 recorders
24 "Committee" personnel and expenses
25 Travel and Hotel expenses
TOTAL $2,367,600
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Page 4
ACTIVITY COSTS
Item
1
2
3
4
5
6
7
8
9
10
Month 1 Month 2
50,900 173,400
17,300
61,600
12,200
i5,000
38,400
80,000 80,000
14,400
14,000 14,000
14,400
Month 3
173,400
17,300
61,600
12,200
15,000
38,400
80,000
14,400
14,000
14,400
Month 4
173,400
17,300
61,600
12,200
15,000
38,400
80,000
14,400
14,000
14,400
Month 5
173,400
17,300
61,600
12,200
15,000
38,400
80,000
14,400
14,000
14,400
Month 6
50,900
80,000
14,OOC
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Item
Paqe 5
-TEST EQUIPMENT COSTS
a Velocity Meter
b Density Meter
c Echo-Sounder
d Position Finders
e Turbidity meter
f "Tank & Piping"
g "Sample Pump"
h Guages
55,000
Survey vessel
Survey vessel
7,000
3,000
1,000
1,000
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Page 6
PLANT MONTHLY COSTS
Item
1
2
3
4
5
6
7
8
9
10
Plant
Dredge
Pipeline
Tug
Derrick
Supply Barge
Crew Boat
Survey Boat
ACOE
ADD
Others
Rental /mo
50,900
17,300
12,200
9,700
14,000
4,000
30,000
4 men
4 men
Op/month
122,500
49,400
2,500
1,000
34,400
50,000
14,400
14,000
14,400
Total
173,400
17,300
61,600
12,200
15,000
38,400
80,000
14,400
14,000
14,400
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POINTS FOR DISCUSSION
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DUSTPAN MEAD
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Dustpan Head - Ex Dredge Kennedy
On visual inspection of the "Kennedy" Dustpan head at St. Louis no problems
emerged which would have prevented the use of this head on the dredge
"Essex." However, it was felt that some of the unnecessary hardware should
be removed from this unit before transporting it to Norfolk. Accordingly,
arrangements were made to remove the following: --
(a) The main water supply pipe to the jet header manifold;
(b) The jet header manifold;
(c) The jet supply pipes;
(d) The cutting teeth fitted to the lower edge of the mouthpiece.
Removal of these appendages and obstructions to flow will then leave the
mouthpiece area "clean" hydraulically. The flow pattern will then approxi-
mate to that shown on the attached sketch reproduced from the tests on
the model head used in the "Jadwin" tests. The hydraulic effect of
alterations or additions at the mouthpiece will then be amenable to calcula-
tion. It is suggested that, in Phase 2, the hydraulic effect of sub-
dividing the mouthpiece area be investigated in an endeavour to ensure
the best entry conditions with the head in its present configuration. The
purpose of this sub-division should be to even out the present uneven flow
within the head and at the same time give the head a better degree of lateral
stability as it passes through the soft material. The dividers or "splitters'
should also extend ahead of and below the entry to break the cohesion of
the higher density silts.
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Dal
jnlet Conditions
C»nt«riine of
Dustpan
Center line
of
Hood
Direction of FloW
Noi« • All Velccltla^ thown In Ft per sec.
Irr.
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KENNEDY LADDER
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Kennedy Ladder
The modifications to the "Kennedy" ladder to suit the "Essex" trunnion
bearings should be relatively simple and straightforward. However, con-
sideration should be given to future use of the "Kennedy" ladder in othjr
dredges in other areas. Should we then design trunnion bearings that can
be easily modified or adapted, e.g., should the bearings be made oversize
to enable various bushings to be used to adapt to other diameter of pins?
Should the width also be adjustable by packing pieces or washers?
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ESSEX WINCH
SPEED-MOTOR RATING-MANOEVRING
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Essex Uinch
The normal mode of dustpan dredge operation utilises two independently
driven winch barrels. This independent operation is used by the dredge
operator to maintain the dredge on the line of cut.
The "Essex" winch is a five barrelled winch driven by a single motor.
It is intended to use the swing barrels of this winch for the head wires
in the dustpan mode. The clutches driving the barrels are air set, spring
release and the barrel brakes are spring set, air release. The character-
istics of the pneumatic controls will require to be investigated to ensure
that the head wires can be operated as if the barrels were independently
driven, i.e., by slipping one clutch or by operating intermittently without
losing tension on the head wires.
The main winch motor is 75 H.P. 400/1600 R.P.M. The barrel pull at 400 R.P.M.
is 20,000 pounds and the line speed based on the second wrap is 60 feet per
minute.
The proposed speed of advance based on 1000 cubic yards per hour output is
5 feet per minute.
The winch is also fitted with an auxiliary motor of 5 H.P. driving through
a right angle reduction gear. Assuming the reduction gear is 75:5, i.e.,
15:1 then the hauling speed using the auxiliary motor would be 4 feet per
minute. Assuming again the same speed range as the main motor, this line
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speed would be variable between 4 feet per minute and 16 feet per minute.
These are assumptions as the auxiliary gearbox reduction and the auxiliary
motor speed range cannot be made available to us at this time.
In view of the uncertainty of this major item effecting production and
testing we feel an early visit to the Dredge Essex should be given highest
priority.
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ESSEX FAIRLEADS
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Fair-leads - Ex. Kennedy
As a dustpan dredge operates on two head wires it is essential that two
robust balanced fairleads are fitted to the forward part of the Dredge
Essex hull.
Accordingly arrangements were made with the ACOE staff at St. Louis to
remove the forward fairleads from the Dredge Kennedy and forward these to
Norfolk on the sane transport as the Kennedy ladder and dustpan head.
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ESSEX STERN ANCHORS
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Stern Anchoring Arrangement
In the normal operating mode a dustpan dredge faces into the river current
and requires only head anchors to remain on station.
When a cut has been completed over the shoal it is only necessary to pay
out on the head wires and the river current will move the dustpan dredge
back to the starting point of the cut.
However, in a tidal estuary where there may be periods of zero flow or
reversal of flow it will be necessary to have four anchors, i.e., 2 head
anchors and 2 stern anchors.
The 2 head anchors will be used in the normal mode when dredging and the two
stern anchors will be used to create a drag to hold the dredge on station
and resist the reversal of tidal flow if this takes place.
It is suggested that the stern anchoring arrangement use the anchor boom
barrels of the main winch.
These wires would require to be led aft by means of snatch block and these
could possibly be fastened to the normal mooring ballards.
Consideration would need to be given to the presence of the pipeline aft
of the dredge.
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Ideally the stern anchor wires should be led underwater to a depth where
they could safely pass under the floating pipeline.
If this is not practical then they could be led upwards to pass over the
floating pipeline.
It is believed that either of these arrangements could be designed using
the existing spuds as attachment points.
This problem would require to be investigated in Phase Two.
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ESSEX PIPELINE
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Essex Pipeline
The discharge floating pipeline of a dustpan dredge is normally rigid,
(no ball joints) fitted with rotating floats which can be trimmed to the
water flow to roughly position the pipeline in relation to the dredge.
The final position of the discharge end of the pipeline is accomplished
by means of a vane in the discharge outlet. This vane is under the control
of an operator located on the last float and adjustment of this vane by
the operator finally positions the discharge end of the pipeline.
This type of discharge arrangement is suitable when the intention is to
spread the material over a long area local to the dredge.
However, it is our belief that the discharge area on the James River will
not be local to the dredge and will not have the same length as the dredge
cut.
On this assumption, i.e., a fixed discharge, a sufficient length of floating
line to allow 1000 feet forward movement of the dredge and sufficient lateral
movement to cover the shoal being dredged must be rented. The configuration
and anchoring arrangements of the pipe! ine must be investigated when
details of the dredging site and deposit ground are made available.
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PHASE 2 - PROPOSED SCOPE OF WORK
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Phase 2 - James River Project: Proposed Scope of Uork
1) Provide final report giving detailed recomnendations for the
dredging tests to be carried out in fiscal year 1981.
2) Visit to Dredge "Essex" on location to inspect and confirm
preliminary information.
3) Provide general arrangement drawing of Dredge "Essex" showing
"Kennedy" ladder and dustpan head fitted.
4) Provide calculations sufficiently detailed to assure the owners of
Dredge "Essex" that the test equipment will neither overload nor
damage the hull or superstructure of the dredge.
5) Provide detailed drawings of the following: --
(a) Modifications to Dustpan Head and suspension;
(b) Modifications to "Kennedy" ladder and pivot bearings to
suit "Essex" pivots;
(c) Modifications to "Essex" fore deck arrangement to enable
"Kennedy" deck fairleads to be used;
(d) Arrangement of "Essex" anchor boom wires used as stern
anchor wires;
(e) Arrangement of sampling points at dustpan head including
detailed drawing of supporting structure;
(f) Sampling tank and fitting of turbidity meter;
(g) Test equipment and fitting instructions;
(h) Any other sketches required to assist the conversion sub-contractor.
6) Provide ADD personnel to discuss all aspects of the conversion with
the nominated subcontractor.
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Page 2
7) Provide ADD personnel on standby at the sub-contractor's work
to ensure the required quality of workmanship.
8) Provide ADD personnel to assist in before charter surveys.
9) Visit to Dredge "Essex" to examine the dredge in the "as is"
condition and to investigate the adjustments or modifications
necessary to the main winch to enable it to be operated in the
dustpan mode.
U o tnvi.umi.jruai Protection Agency
GLNPO Library Collection (PL-12J)
77 West Jackson Boulevard,
Chicago, IL 60604-3590
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