EPA-AA-EOD-FSB-88/3
Technical Report
The Emco Fuel Tank Monitoring System
Systems Analysis
By
B. Scott Ruble
Mechanical Engineering Technician
December 28, 1988
NOTICE
Technical Reports do not necessarily represent final EPA decisions or
.positions. They are intended to present technical analysis of issues
using data which are currently available. The purpose in the release of
such reports is to facilitate the exchange of technical information and to
inform the public of technical developments which may form the basis for a
final EPA decision, position or regulatory action.
Facility Support Branch
Engineering Operations Division
Office of Mobile Sources
U. S. Environmental Protection Agency
2565 Plymouth Road
Ann Arbor, MI 48105
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Table of Contents
Objective 1
Summary 1-2
Background 3
Cross Section Fuel Tank Farm 4
Segment 1: EFTMS and Dipstick Data Comparison
Conversion Table Comparison 5
Comparison of EFTMS and Dipstick Readings 5
Study Limitations 6
Recommendat ions 6
Conclusions 6
Segment 2: Comparison of EFTMS Accuracy to
Manufacturer's Specifications
Discussion of Manufacturer's Accuracy Specifications 7
Discussion of Actual EFTMS Volume Measuring Accuracy 7
Comparison of Accuracies: Actual vs. Manufacturer 8
Study Limitations 8
Recommendations 9
Conclusions 9
Segment 3: Information Stored in the Tank Level Monitor
Information Attainable from the Tank Level Monitor 10
Data Stored in the Tank Level Monitor 10
Study Limitations 10
Recommendations 11
Conclusions 11
Overall Report
Recommendations 12
Conclusions 12
Information Stored in Tank Level Monitor 13
Appendices
A (Fiberglas* Conversion Table) 14
B (EFTMS Conversion Table) 16
C (Conversion Table Graphs) 17
D (Conversion Tables Gallons Difference Graph) 18
E (Conversion Tables Percent Difference) 19
F (Comparison of Emco and Dipstick Readings) 21
G (Emco and Dipstick Percent Difference) 29
H (Emco and Dipstick Full Scale Percent Difference) 30
I (Emco and Dipstick Gallons Difference) 31
J (Manufacturer' s EFTMS Accuracy) 32
K (Actual EFTMS Volume Measuring Data) 35
L (Stored Information in Tank Level Monitor) 39
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-1-
Objective
A system verification was performed on the Emco Fuel Tank Monitoring System
(EFTMS). Three aspects of the Emco system were investigated. The purpose of
this report is to present the findings of the investigation which dealt with
the following:
Segment 1) Compare the fuel level and volume measurement data of the
new Emco system to related data of the old dipstick
measurement method.
Segment 2) Check the volume measuring accuracy of the Eroco system and
compare it to that specified by the manufacturer.
Segment 3) Document the existing information that is stored in the
Tank Level Monitor.
Summary
Segment 1
EFTMS and Dipstick Data Comparison
The fuel level measurements collected electronically by the Emco Fuel Tank
Monitoring System (EFTMS) were very similar to those collected manually by
the dipstick method. Correspondingly, the conversion table graphs for
both methods were almost identical. As can be seen by the difference and
percent difference plots of the conversion tables in appendices D and E,
there is minimal scatter. On the average, however, the dipstick
measurements of fuel level were slightly higher than the EFTMS's. For
fuel storage tanks one through eight, the average difference between EFTMS
and dipstick fuel level measurements was 1.56 inches. In terms of volume
(gallons), the largest percent difference between the two measurement
methods, expressed as a percent of full scale capacity, was 3.6% and the
lowest was .87%. For a given tank, however, the offset was quite
consistent. Hence the data is acceptable for our use in monitoring tank
fuel levels.
Segment 2
Check of EFTMS Accuracy and Comparison to
Manufacturer's Specifications
The actual volume measuring accuracy was checked and compared to the
manufacturer's claimed volumetric accuracy. For purposes of comparison,
the accuracy claimed by the manufacturer, which is expressed in inches,
was converted into units of gallons. The manufacturer's specifications
claim accuracies of approximately +0.53 to +_1.700 gallons of fuel
depending on the level of fuel in the tank. These volumetric accuracies
represent +.01 inches of fuel at specific ranges of the storage tank. The
EFTMS displayed a perfect accuracy for storage tanks 1, 2, 4 and 7 and an
accuracy of +_1 gallon in tanks 3, 5, 6 and 8. Overall, the volume
measuring accuracy of the EPA's EFTMS meets or exceeds that guaranteed by
the manufacturer.
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-2-
Segment 3
Information Stored in the Tank Level Monitor
Via the front panel of the Tank Level Monitor most of the information
programmed into the EFTMS was obtained. A complete listing of this
information is included in appendix L. Further information such as the
conversion table can be obtained by interfacing a computer with the Tank
Level Monitor. However, due to the complexity of this operation and lack
of equipment, an interface was not attempted. If more information is
desired or an alteration to the factory programmed information is needed,
the company which services the EFTMS should be contacted for assistance.
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-3-
Background
This study involves fuel storage tanks one through eight which contain various
fuels used in vehicle testing. These storage tanks have a capacity of 10,000
gallons and have a diameter of 92 inches. With their cylindrical body and
spherical ends, the storage tanks resemble the shape of a cigar. The tanks
are located underground at the rear of the EPA.
The old method of determining storage tank fuel volume involved using a
dipstick. Resembling a long wooden pole marked off in increments of 1/4", the
dipstick was used to measure the fuel depth of the storage tanks. The
measured inches of fuel could then be converted into gallons via a conversion
table supplied by the tank manufacturer, Owens/Corning. A copy of this
conversion table for the Fiberglas* fuel storage tanks is supplied in appendix
A.
Due to the technique involved in dipstick fuel measurements, some inherent
problems existed. These problems consisted of the following:
1. When taking measurements, the fuel level line left on the
dipstick was difficult to detect.
2. The dipstick could not be used during wet weather.
3. The dipstick had a low sensitivity to small volume changes.
4. In cold weather, the fuel level line would not evaporate off of
the stick which made future stick readings difficult.
To improve upon the old method of fuel measurement, the EPA installed an
EFTMS. The new measurement system, manufactured by Emco Wheaton, utilizes
tank probes to sense both fuel and water levels. These probes generate
electrical signals which are picked up by the Tank Level Monitor mounted
inside the EPA. For purposes of converting inches of fuel into gallons, the
EFTMS also has its own conversion table which is programmed into the Tank
Level Monitor. A copy of the downloaded EFTMS conversion table is included in
appendix B. The EFTMS currently monitors storage tanks one through eight. As
depicted in the following picture (figure 1), the EFTMS consists of the Emco
tank probes, float sensing mechanisms, Tank Level Monitor, and assorted wiring.
*Registered TM - Owens Corning Fiberglas Corporation
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-4-
Fuel Tank Farm
(cross section of two fuel tanks)
Floater Sensing Mechanisms
Tank Level Monitor (wall unit mounted inside EPA
Emco Tank Probe
Fuel Storage Tank (cross section)
Fuel
water condensation
Figure 1.
See the operating and installation manuals for additional details.
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-5-
Segment 1
EFTMS and Dipstick Data Comparison
Conversion Table Comparison
Initially the conversion tables of the EFTMS and the dipstick method were
compared. These conversion tables facilitate the changing of fuel depth
(inches) into fuel volume (gallons). For the dipstick method, the Fiberglas*
conversion table (model C-3) included in appendix A was utilized. As for the
EFTMS, the downloaded conversion table from the Tank Level Monitor was used.
The EFTMS conversion table, presented in appendix B was supplied by Warren
Braun, a manufacturer's representative. For both of the conversion tables
volume vs. depth was plotted to establish a visual correlation. As can be
seen from these graphs (appendix C), the curves for the conversion tables are
nearly identical. The difference and percent difference graphs of these
conversion tables further support their similarity. Both graphs displayed
minimal scatter and are included in appendices D and E respectively.
Comparison'of'EFTMS'and'Dipstick' Readings
To check for any discrepancies in EFTMS or dipstick measurements, their
readings of fuel level were plotted over a three month period. These fuel
level measurements were collected by the chemistry lab prior to this study.
However, please note that these measurements obtained by the EFTMS and the
dipstick method were not performed at the exact same time. A time span of
approximately 30 minutes separated the measurements taken by the EFTMS and
dipstick method. Therefore any fuel removed from the tanks after the dipstick
reading was taken and prior to the EFTMS reading would bias the data. Based
on this, large discrepancies between specific dipstick readings and EFTMS
measurements could be explained. However large discrepancies between the two
methods over a long period of time may indicate a significant difference
between the two measurements systems.
Both the EFTMS and the dipstick method use the inch as its base unit.
Therefore, disregarding potential bias effects due to unexpected fuel removal,
any volume discrepancies between the two methods is directly related to
measuring fuel levels differently. Hence to save time, the large fuel level
data set which was collected in inches was not converted into units of gallons.
As can be seen by the comparison graphs included in appendix F, the dipstick
fuel level measurements are generally higher for most storage tanks than those
of the EFTMS. The pitch of the storage tanks may be the primary reason for
this discrepancy. Due to the physical parameters of the storage tanks, all
dipstick readings can only be taken from the South end of the tanks, but the
EFTMS sensing probes were installed at the North end of the tanks. Any pitch
in the tanks could cause a variation in the fuel levels determined by either
method. The EFTMS does have the capability to correct for tank pitch.
However because the EPA does not precisely know the tank pitches, all pitch
correction factors for the EFTMS have been set to zero. Though the EFTMS
seems more advanced than its counterpart, it is important to note that this
report does not compare the accuracy of the two methods.
*Registered TM - Owens Corning Fiberglas Corporation
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-6-
To obtain a numerical assessment of the difference between the two methods,
the percent difference and percent difference full scale were plotted for the
entire fuel level data set. These graphs are included in appendices G and H
respectively. In addition, the average difference between the EFTMS and
dipstick fuel level readings were calculated for all tanks.
The following is a summary of the results. All values are in units of inches.
Tank 1 Tank 2 Tank 3 Tank 4 Tank'5 Tank'6 Tank"7 Tank 8
-1.29 -.01 -1.91 -1.80 -.91 -2.80 -1.60 -2.21
Average of all Differences for all Tanks: -1.56
To establish a volumetric comparison, the difference in gallons between the
two methods was calculated. These results are displayed in appendix I. Only
the most extreme volume differences were considered for these calculations.
Overall, the lowest full scale percent difference was .87% for tank 5 and the
highest was 3.60% for tank 6.
Study Limitations
Only a portion of each storage tank's total volume could be examined at this
time. Because the graph of Tank Volume vs. Inches represents a third order
polynomial, discrepancies between the two measurement systems may be more
pronounced at different portions of a tank. Also the only data available to
study the difference between the dipstick method and the EFTMS could be biased
due to different measurement times.
Recommendations
Only 3 months of data was available for this study. A larger data set
collected over a longer period of time is needed to compare the measurement
methods over the full range of tank volumes. Also action should be taken to
ensure that the two measurements from each of the two methods are taken at the
exact same time.
Conclusions
The conversion tables for the two methods were nearly identical. Data
collected by the EFTMS and the dipstick method were very similar. However,
the dipstick data readings were on the average higher than those of the EFTMS.
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-7-
Segment 2
Comparison of EFTMS Accuracy to
Manufacturer's Specifications
Discussion of Manufacturer's Accuracy Specifications
For the purposes of the EPA, the manufacturer of the EFTMS did not report the
accuracy of the EFTMS in terms that were convenient for a volume accuracy
assessment. The manufacturer, Emco Wheaton, specified that the float sensing
mechanisms, shown in figure 1, were accurate to +_.01" of fuel. However for
comparison purposes, a manufacturer's volume measuring accuracy in units of
gallons was needed. Based on the manufacturer's reported float accuracy, the
EFTMS's corresponding accuracy for volume measurement was derived.
In the process of deriving the EFTMS volume measuring accuracy, a number of
different factors were assessed. As a result of the cylindrical shape of the
storage tanks, the volume measuring accuracy should vary with respect to the
fuel level. This variable volume accuracy is a result of the EFTMS using fuel
inches as its base measurement which the machine then converts into gallons
via a conversion table. The conversion table, which is included in appendix
B, produced a third order polynomial when gallons vs. inches was plotted.
Hence, volume inaccuracies should be more enhanced at the midpoint of this
curve (appendix C) than at the beginning or end of the curve. In other words,
the volume measuring accuracy of the EFTMS should be least accurate when a
storage tank is half full. To support this statement, the EFTMS volume
measuring accuracy for nine different tank volumes was calculated with respect
to the floater's accuracy of +_.01". The results of all the calculations are
included in appendix J. The greatest volume measuring accuracy was ^53
gallons for the range 0-10.5 inches of fuel and the lowest accuracy was +1.70
gallons for the range 50.5-60.5 inches of fuel is approximately the middle of
a typical 10,000 gallon storage tank.
Discussion' of Actual' EFTMS "Measuring Accuracy
To obtain data on the actual volume measuring accuracy of the EFTMS, a fuel
measurement study was conducted on all eight storage tanks. With a five
gallon container certified by the National Bureau of Standards, 20 gallons of
fuel was removed in five gallon increments from seven of the eight storage
tanks. After each five gallon extraction, the volume change registered by the
EFTMS was recorded. Tank number 6 is a dump tank and doesn't have any readily
accessible extraction points. Therefore, on tank number 6, 20 gallons of fuel
was dumped into it in five gallon increments. As with the other tanks, the
same data collection procedure was followed on tank 6. All of the data and
statistics which were collected are presented in appendix K. Overall for a 20
gallon fuel sample, the EFTMS displayed a perfect accuracy for storage 1, 2,
4, and 7. For storage tanks 3, 5, 6, and 8 the EFTMS displayed an accuracy of
+1 gallon. However, it should be noted that the Tank Level Monitor only has a
resolution of 1 gallon.
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-8-
Comparison of"Accuracies: Actual vs. Manufacturer
The manufacturer indicated that the EFTMS is accurate to +.01" of fuel which
translates into a volume accuracy ranging from +_. 531 gallons to +1.70
gallons. This study suggests that the EPA's particular Emco equipment
generally meets the sensitivity specified by the manufacturer.
The following data are the EFTMS derived manufacturer volume measuring
accuracies for each tank with respect to individual tank fuel volumes
(appendix J). All units are in gallons, also these stated values represent
+0.01" of fuel at the tank fuel level when the measurements were taken.
Tank 1 Tank'2 Tank"3 Tank'4 Tank'5 Tank'6 Tank'7 Tank 8
+_1.37 +_1.19 1-949 +_.949 ±-949 +1.22 _+1.37 + 1.37
The following are the EFTMS deviations from true volumes for each tank
(appendix K). All units are in gallons.
Tank"1 Tank 2 Tank 3 Tank-4 Tank 5 Tank 6 Tank 7 Tank-8
+0.00 +p.OO -1.00 +_0.00 -1.00 +1.00 +0.00 +1.00
Overall, most of the deviations are lower than the derived manufacturer
accuracies for each individual tank. Only tanks 3 and 5 have EFTMS deviations
which exceed their respective derived manufacturer accuracies.
Both tanks 3 and 5 showed a deviation of -1 gallon which is above the
manufacturer's accuracy specification of +_.949 gallons. However, this only
represents a difference of .051 gallons. A -1 gallon error for a 20 gallon
sample only represents a 5% error. Relative to the entire storage tank volume
of 10,00 gallons, a -1 gallon error signifies a .01% error. Also, it is
important to note that the Tank Level Monitor is only capable of displaying or
printing gallon values which are whole numbers. All fractions of gallons are
either rounded up or down to the nearest whole number integer. Hence, the
volume measurements of tanks 3 and 5 may have been below the +_. 949 gallon
specification, but upon displaying their measurements the Tank Level Monitor
rounded them up. In addition, the specification of j+,949 gallons is only a
derived approximation of the EFTMS volume measuring accuracy for a certain
region of the storage tank. In essence, because the deviations in tanks 3 and
5 are not significant, a serious compliance problem with manufacturer
specifications does not exist.
Study Limitations
The limitations of this study are as follows:
1. The entire range of each fuel tank volume could not be tested because
of fuel usage limitations. Only readings of the most current volume for
each tank could be assessed.
2. This study does not address the issue of absolute fuel volume
measurement. It only evaluates the accuracy with which the EFTMS can
detect volume change. No conclusion from this study can be made about the
absolute volume accuracy of the EFTMS.
-------
—Q—
Recommendat ions
In response to study limitation number 1, it is recommend that a future
project be instituted to assess a greater range of volume changes. Such a
study could be performed at the next refilling of the storage tanks. As for
study limitation number 2, no feasible ideas have been developed to address
that issue.
Conclusions
Except for a few very minor irregularities, the Emco Fuel Tank Monitoring
System does meet the manufacturer's specifications. In fact, the EFTMS
exceeds many of the volume measuring accuracies which were calculated from
data reported by the manufacturer.
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-10-
Segment 3
Information Stored in the Tank Level Monitor
Information Attainable from the Tank Level Monitor
All pertinent information about the fuel tank farm can be obtained from the
front panel of the Tank Level Monitor which is mounted inside the EPA. The
print mode and the display mode enable an operator to access different sets of
data on the storage tanks. The following is a listing of the information
which can be obtained from the different modes.
Print Mode:
Date and Time
Shift Report
Station Header
Inventory Report
Alarm Pending
Alarm History
Tank Parameters
Display Mode:
Fuel Level and Temperature
Fuel in Temperature Compensated Gallons
Fuel and Water Level in Inches
Ullage
Date and Time
Automatic Report Print Times
Maximum Tank Volume
Calibration Value
Fuel Type
For information on how to actually access this information from the front
panel of the Tank Level Monitor please refer to the manual, "Tank Level
Monitor Operating Instructions".
Data Stored in the Tank Level'Monitor
For purposes of documentation, most of the data which is currently programmed
into the Tank Level Monitor was recorded. All collected data can be accessed
via the front panel of the Tank Level Monitor. This information is listed in
appendix L. Further information such as the conversion table can be obtained
if a computer is interfaced with the Tank Level Monitor. However, due to the
complexity of this operation and lack of equipment, an interface was not
attempted. If more information is desired or an alteration to the existing
factory programmed information is needed, the company which services the EFTMS
should be contacted for assistance.
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-11-
Study Limitations
More information is stored in the Tank Level Monitor than presented in this
report. However, this information can only be obtained by interfacing the
Tank Level Monitor with another computer.
Recommendations
To insure the integrity of the EFTMS, the factory preset access code should be
changed. Via the Tank Level Monitor, the access code allows individuals to
set various important tank parameters such as the pitch correction factor,
calibration value, and the product code. If an individual accidentally or
intentionally used the access code which is mentioned in the "Tank Level
Monitor Operating Instructions", he could change very important tank
parameters and consequently cause future invalid tank measurements.
Conclusions
All data accessible from the front panel of the Tank Level Monitor is included
in appendix L.
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-12-
OVERALL REPORT
Recommendations
1. To allow a greater range of tank volumes to be compared, EFTMS
and dipstick measurements should be collected over a period of time
longer than three months. Also measurements by the EFTMS and dip-
stick should be taken at the same time.
2. To determine the measurement accuracy of greater volume changes,
tank volume measurements should be taken with the EFTMS at the next
tank refilling.
3. To safeguard against accidents or potential foul play, the EFTMS
factory preset access code should be changed.
4. The EFTMS performance is adequate for the EPA's needs and it
should be approved as our primary underground fuel level sensing
device.
Conclusions
Segment 1
EFTMS and Dipstick Data Comparison
The volume measurements collected electronically by the EFTMS were very
similar to those collected manually by the dipstick method. On the average,
however, the dipstick measurements of fuel level were slightly higher than the
EFTMS1s. The conversion tables for both methods were almost identical. In
terms of volume(gallons), the largest percent difference between the two
measurement methods relative to the entire tank volume was 3.6% and the lowest
was .87%. These offsets are quite consistent for any given tank.
Segment 2
Comparison of EFTMS Accuracy to
Manufacturer's Specifications
Overall, the volume measuring accuracy of the EPA's EFTMS is better than that
guaranteed by the manufacturer. Relative to manufacturer specifications, the
greatest accuracy was ^.53 gallons of fuel and the lowest was +^1.70 gallons.
These accuracies are based on the EFTMS's sensitivity to different fuel
levels. With respect to the system's actual accuracy, the EFTMS displayed a
perfect accuracy for storage tanks 1, 2, 4, and 7 and an accuracy of +1 gallon
in tanks 3, 5, 6, and 8. However, it should be noted that the Tank Level
Monitor only has a resolution of 1 gallon.
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-13-
Segment 3
Information Stored in the Tank Level Monitor
Via the front panel of the Tank Level Sensor, which is mounted inside the EPA,
most of the information programmed into the EFTMS was obtained. A complete
listing of this information is included in appendix L.
1093e
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Appendix A
-14-
.1 OWENS COBNING
FIBERGLAS
Fiberglas* Tanks
for Fuel Storage
Calibration Chart
Model C-3 10,000 Gallon Tanks
Model C-3 10,000 Gallon Tanks/Tank Size and Capacity in Gallons
Calibrations for Level Tanks
Actual Capacity 9520 Gallons
Dipstick
78"
V4"
3V
Vj"
5/8"
Vt"
'.V
1"
1 78"
1 V4"
1 %"
1 V2"
1 Va"
1 3/4"
1 %"
2"
2'/8"
2V."
2%"
2 'A"
25/a"
23/4"
2%"
3"
3Va"
3'/4"
33/8"
3'A"
35/a"
33/4"
3%"
4"
4Vs"
4'/4"
43/a"
4 'A"
45/a"
43/4"
4%"
5"
5Va"
5'/4"
53/a"
5'/2"
55/a"
53/4"
5%"
6"
6Va"
6'/4"
63/8"
Gallons
1
1
2
3
4
5
6
8
10
12
15
18
21
25
28
32
• 36
40
44
48"
53
57
62'
^83fe»
72:
77"
82 -
"j-v QQ^-
t^j** *
93.-:
93-v:
104*?
~ne*
-.iteM
••M22JZ
•!^28^
••":T3ff*
:140T:
•M.4^9
•1523?
— 159*=-
16ft>
172:'.
179
••"180"
193
200
208
• 215""
222.
230.
237"
Dipstick
6'/2"
6V8"
63/4"
6%"
7"
77s"
7'/4"
73/a"
7 'A"
75/8"
73/4"
7%"
8"
8'/8"
8'/4"
83/a"
8'A"
85/s"
83/4"
8%"
9"
9'/8"
9'/4"
93/8"
9'/2"
95/a"
' 93/4"
9%"
10"
10%"
10 '/4"
10%"
10'A"
10%"
1 03/4"
10%"
11"
1 1 %"
1 1 "A"
1 1 3/a"
1 1 V2"
115/a"
1 1 3/4"
1 1 %"
12"
1 2'/8"
1 2'/4"
1 23/8"
12'/2"
1 2V8"
1 23/4"
Gallons
245
253
260
268
276
284
292
30C
308
317
325
333
342
351
359
368
377
386
395
404
•.-4.13.,,.
422
431
441
--450-
459
469
478
*488~
498
* 508*"
518
rt^gjJBor
-•rSSSit
548?"
-558£
«*>&»'.
578%
588.
599"
•609^
619
630
640
<6S1-
662
672
683
694*
705
716
Dipstick
12%"
13"
13Va"
1 3'/4"
1 33/a"
1 3'/2"
1 35/8"
1 33/4"
1 3?/8"
14"
14Va"
14 V4"
143/e"
U7z"
1 45/a"
1 43/4"
14%"
15"
I57a"
15'/4"
1 53/a"
1572"
1 5V8"
1 53/4"
1 5%"
16"
1 6Va"
1 674"
1 63/8"
1 6'A"
1 65/B"
1 63/4"
1 67/s"
17"
17Va"
1 7'/4"
1 73/a"
1 7'/2"
1 7V8"
1 73/4"
1 77/a"
18"
1 8Va"
1 874"
183/a"
1 8'/2"
18V8"
1 83/4"
18%"
19"
1 97e"
Gallons
727
738
749
760
771
783
794
805
817
828
839
851
862
874
886
897
909
921
933
945
957
-969e»
98tv
994.'
1006-;?
>»tt*aK.
103Q--
1042,":
1055:t
.AtOSPK*
1^9*'
1092g«
tto«^
•^^WfflS!
1.T30K
1142^5:
1155fe<
>-*$^6ft*.
tier.?/
1194
1207-
1220^
1233
1246
1259
1272
1285
1298
1311
1324
1337
Dipstick
1 974"
1 93/8"
1 9V2"
1 9Vs"
1 93/4"
1 97/a"
20"
20 7a"
2074"
203/8"
20V2"
20%"
203/4"
20%"
21"
21Va"
2T/4"
213/8"
2172"
215/8"
213/4"
21%"
22"
22Va"
22'A"
223/8"
22'/2"
225/s"
223/4"
22%"
23"
23Va"
2374"
233/a"
23'/z"
235/8"
233/4"
23%"
24"
247s"
2474"
243/8"
24'/2"
245/8"
243/4"
24%"
25"
25Vs"
25'A"
253/s"
25'A"
Gallons
1351
1364
1378
1391
1405
1418
1432
1446
1459
1473
1486
1500
1514
1527
1541
1555
1569
1583
159*.
161t
1625
1639
>i«6a,;
1667,
168t!-x
1695K
-wia*
1724v^
1738-
1753&
T78^V
T?98^
18t«3
-^ftm
1840*
1855fe(
1869W
'Jt88*W
1899-:
191S;::
1928-?
194*
1958
1972
1987
2002**
20T7
2032
2047
2062*"
Dipstick
2 55/a"
253/4"
25%"
26"
267a"
2674"
263/8"
2672"
265/e"
263/4"
26%"
27"
27 W
27 W
273/a"
27 W
275/8"
273/4"
27%"
28"
28'/8"
28'A"
283/8"
28V2"
285/8"
283A"
28%"
29"
29'/a"
2974"
293/a"
29'/z"
295/a"
293/4"
29%"
30"
30'/8"
30'/4"
303/8"
30 72"
305/8"
303/4"
30%"
31"
317a"
31 'A"
313/a"
31'/2"
315/a"
313/4"
31%"
Gallons
2077
2092
2107
2122
2137
2152
2167
2182
2197
2213
2228
2243
2258
2274
2289
2304
2320
2335
2350
236&.
2382
2397.
2413
242ft*.
2444S-
2460'A
2475-
=*»»»»*
2507: •
2522
2538/3
•265*
2S7Qp
258**;
260^
•*****£
2833^
2649^
2685i~
^288*56
2697.^
2713';
2729V.
2746"
2761
2777 .
2793:
2809**
-2826X
2842
2858 1
Dipstick
32"
32Vs"
32'/4"
323/e"
3272"
32s/e"
323/4"
32%"
33"
33Va"
33'/4"
333/a"
3372"
335/8"
333/4"
33%"
34"
34 7a"
3474"
34W
34'/i"
345/e"
343/4"
34%"
35"
35Va"
3574"
353/8"
35'/2"
355/e"
353/4"
35%"
36"
3678"
36'A"
363A"
36'A"
365/b"
36%"
36%"
37"
37%"
37'/4"
373/8"
, 37V2"
' 375/8"
373/4"
37%"
38"
38%"
38'A"
Gallons
2874
2890
2906
2923
2939
2955
2971
2988
3004
3020
3037
3053
3069
3086
3102
3119
3135...
3151
3168
3184-.A
-320^
3217.-
3234=*
325 1*J
32«l*i
3283S
3300. rv3
331 &«
Dipstick
383/8"
38'A"
385/8"
383/4"
38%"
39"
39%"
39'A"
393/a"
39'A"
395/a"
393/4"
39%"
40"
407s"
4074"
403/a"
40'A"
405/8"
4Q3/4"
40%"
41"
41'/a"
4174"
413/8"
41 "A"
415/8"
413/4"
--aaaasd 41%"
3349*3 42"
336tt'0jj 42%"
3382^] 42'/4"
**&m | 42%"
34tQH 42'A"
3*3231 425/s"
344»d 423/4"
•^9468« 42%"
3493*1
351 0^
-3533**
35503>
3567V-
3584-'
360O*
3617
3634:ci
3651""-
^668^
3685s
3702*-
43"
43%"
43'A"
433/a"
43'A"
435/a"
433/4"
43%"
44"
44 %"
44 74"
443/8"
44 'A"
445/a"
Gallons
3719
3736-
3752
3769
3786
3803
3820
3837
3854
3870
3887
3904
3921
3938
3955
3972
3989
4006-;
4023
4040 ;
4057'
•-4014M
4091"
4108'^
41253
"**nr*
416tt;
4t77Si
4194^
422fife
4243,*;
^•"^^^^B
4289^1
^43l«i
433IIJ
4365?
-------
-15-
Model C-310,000 Gallon Tanks/Tank Size and Capacity in Gallons
Calibrations for Level Tanks
Actual Capacity 9520 Gallons
Dipstick
44%"
44%"
45"
45Va"
45'/4"
45%"
45'A"
45Vs"
453/4"
45%"
46"
46%"
46'A"
463/8"
46V2"
46V8"
463A"
46%"
47"
47Va"
47'/4"
47%"
47'/2"
475/s"
473/4"
47%"
48"
48Va"
48'/4"
48%"
48'A"
48V8"
483A"
48%"
49"
49Vs"
49'/4"
49%"
49'A"
495/a"
49%"
49%"
50"
SOVa"
50V4"
503/8"
50 'A"
505/8"
503/4"
50%"
51"
51Va"
51V4"
513/a"
51'/2"
Gallons
4588
4605
4622
4639
4656
4674
4691
4708
4725
4743
4760
4777
4795
4812
4829
4846
4864
4881
4898
4915
4932
4949
4967
4984
5001
5018
5035-*
5052
5069
5086
5103 w
5121
5138
5155
5172*
5189
5206?
5223..
•t£0ftte
525ff^
5275\
5292?:
•^ssw*1
5326«
5343-;
5360 v
5377"*
5394,
5411
5428
5445-
5462
5479
5496
551 3*
Dipstick
515/a"
51%"
51%"
52"
52Vs"
52V4"
523/8"
52V2"
525/B"
52%"
52%"
53"
53Va"
53'/4"
533/8"
53'/2"
535/a"
533/4"
53%"
54"
54 Va"
54 V>"
54%"
54 'A"
545/s"
54V4"
54 %"
55"
55'/8"
55'A"
55%"
55'A"
555/B"
55%"
55%"
56"
56Va"
56'/4"
56%"
56'A"
56%"
56%"
56%"
57"
57'/8"
57'A"
57%"
57V2"
57%"
57V4"
57%"
58"
58 Va"
58'/4"
58%"
Gallons
5530
5547
5564
5581
5598
5615
5632
5649
5666
5683
5700
5717
5734
5751
5768
5785
5801
5818
5835
5852
5869
5886
5903
5920
5937
5953
5970
5987
6004
6020
6037
605**^
6070
6087
6103
6t20*|
6137-
6153,-
617Q..
•"HW8?**1
6203-
6220-
6236
>>«853-;
6270
6286
6303
63»9*-<
6336
6352
6369
6385.
6401
6418
6434
Dipstick
58'/2"
585/8"
58%"
58%"
59"
59V8"
59V4"
593/e"
59V2"
595/e"
593/4"
59%"
60"
60Va"
60 V4"
603/8"
60V2"
605/a"
603A"
60%"
61"
61 Ms"
61'/4"
613/8"
61VS"
615/8"
613/4"
61%"
62"
62Va"
62 W
623/8"
62'A"
625/8"
623A"
62%"
63"
63Vs"
63V4"
63%"
63V2"
635/8"
63%"
63%"
64"
64 Va"
64 'A"
64%"
64 '/2"
645/8"
643/4"
64%"
65"
65Va"
65'A"
Gallons
6451
6467
6483
6500
6516
6532
6549
6565
6581
6597
6614
6630
6646
6662
6678
6695
6711
6727
6743
6759
6775
6791
6807
6823
6839
6855
6870
6886
6900*
6918
693*-
694ft?
-'.daOJGEta
- U9mr^w
6981^:
6997
7012,
s»w«*i
7044?-
7059:;:;
70755*"
.?Z09fefc
7106:.
7122r-
7137"
•-•*!«»*
7168.
7184
7199
72fS*
7230
7245
7261
7276^
7291
7307
Dipstick
653/8"
65 "
75'/4"
75%"
75V2"
755/8"
75%"
75%"
76"
76%"
76'/4"
76%"
76V2"
765/8"
76%"
76%"
77"
77%"
77'A"
77%"
77V2"
775/a"
77%"
77%"
78"
78%"
78'A"
78%"
78'/2"
785/a"
78%"
78%"
79"
Gallons
8115
8128
8142
8155
3168
8182
8195
8208
8221
8235
8248
8261
8274
8287
8300
8313
8326
8339
8351
8364
8377
8389
8402
8415
8427
^8440
8452
8465
8477
8490
8502*
8514
8526
8538
8550
8562
8574
8586
859&»
8610
8622,
8634.
8645r
8657
8669
8680
8692:x
8703
8715
8726
8737'
8749
8760
8771
8782'
Dipstick
79Mj"
79'/4"
79%"
79Vz"
795/3"
793/4"
79%"
80"
SOVa"
80V4"
803/8"
80 V2"
8Q5/8"
8Q3/4"
80%"
81"
81Va"
81'/4"
813/8"
81V2"
815/8"
813/4"
81%"
82"
82%"
82'/4"
823/a"
82 '/2"
825/8"
823/4"
82%"
83"
83%"
83V«"
83%"
83V2"
835/a"
833/4"
83%"
84"
84 Ve"
84 V."
84%"
84 W
84%"
84%"
84%"
85"
85'A"
85'A"
853/8"
85'A"
855/8"
853/4"
85%"
Gallons
8793
8804
8815
8826
8837
8848
8858
8869
8880
8890
8901
8911
8921
8932
8942
8952
8962
8972
8982
8992
9002
9012
9021
9031 -.
9041
9050
9060
9069^-
9078
9088-.
9097
'«W»«M
9115 -
9124
9133
9147>a
9151
91 ea
9168>:>
"-vnm
9186^
9194*4
92033
*-9»W*
9219^;
9228:'
9236
924*>~
9252
9260
9268
9275.-
9283.
9290
9298>V
Dipstick
86"
86%"
86V4"
86%"
86'A"
865/8"
863/4"
86%"
87"
87%"
37'/4"
87%"
87 'A"
875/e"
873/4"
87%"
88"
88%"
88 'A"
883/8"
88'A"
885/8"
88%"
88%"
89"
89Vs"
89'/4"
89%"
89'A"
895/a"
89%"
89%"
90"
90 VB"
90 '/4"
90%"
90'A"
90%"
903/4"
90V8"
91"
91%"
91'/4"
91%"
91 'A"
915/e"
91%"
91%"
92"
Gallons
9305
9312
9319
9326
9333
9340
9347
9353
9360
9367 .
9373
9379
9386
9392
9398
9404
9410
9416
9422
9427
9433
9438
9443
9448
9453 •<
9458
9462
9467 i
••94-7-t-a
9475-;
9479 ^
9483:?i
•«94WS«
9491 -\
9494
94?;-
#«501
9504
950F^
9510^
«*86t3ti
9514*?
-9515^
: 9517 v
••"'99W&II
9518
9519 j
9519 'J
>9520uJ
1
•
,
-------
Appendix B
-16-
EFTMS Conversion Table
STICK VOLUME
(IN) (GALLONS)
0.50
1.00
1.50
2.00
2.50
3.00
3 . 50
4.OO
4.50
5.00
5.50
6.00
6.50
7.00
7.50
8.00
8.50
9.00
9.50
10.00
10.50
1 1 . 00
11.50
12.00
12.50
13.00
13.50
14.00
14.50
15.00
15.50
16.00
1 6. 50
17.00
17.50
18.00
18.50,
19.00
19.50
20.00
2O. 5O -,
21^00
21.50.
22-. 00
22.50
23'; 00
23.50
24.00
24.50
25.00
25.50
26.00
26.50
2.20
3.16
18.32
31-. 88
48. 22
66.86
87.49
109.88-
133.89
159.43
186.43
214.86
244.67
275. 82
308.27
341.9-7
376.88
412.95
450. 12
488.35
527.59
567 \ 82
608.98
651.05
694.01
737-. .83
782i 48,
827i 96,
874. 2~5
921/32
969.. 17
1017.77
1067.11.
1117>*74
1167.94>
1219.39-,
127JL.5&,
132,4^25,.
1377,, 64,;
143X,6£,
1486321..
154JJ35-3
IHKfeWtj
1 653^347
171^13:
1767.43^
1 825.i 23e
1883i £37
1 942^343
200U56-
2661.26-"
2121.42-
2182.01
STICK VOLUME
(IN) (GALLONS)
27.00
27 ..50
28.00
28.50
29.00
29. 50
30.00
30.50
31.00
31.50
32.00
32. 50
33.00
33.50
34.00
34.50
35.00
35. 50
36.00
36.50
37.00
37.50
38.00
38.50
39.00
39.50
40.00
40.50
41.00
41.50
42.00
42.50
43.00
43. 50 •
44.00
44i 50
45;pO
45., 5Cl
46*00,
46., 50
47; 00
47750
48*000
48350,
4?? 00;
49,50
50.;. 00 :
5O.i 50
51.00
51 . 50
52.00
52.50
53.00-.
2243.02
2304.45
2366.28
2428.50
2491 . 09
2554.05
2617.35
2680.99
2744.95
2809.22
2873.78
2938.63
3003.75
3069. 13,
3134.75
3200. 62
3266.71
3333.01
3399.53
3466.24
3533. 15
3600.24
3667.50
3734.93
3802. 52,
3870.26
3938,13.
4O06..14
4074.27
4142,51
4210.85
4279.29-
4347.80
4416.38
4485.01-
4553.69
4622.39.
46914 ,122
475S,B6;
4820.5.9:'
4*97i?lC
4*66. PO*
5034 * 66 j
51p3>26~
5J7JU91:
5240? 29^
530&i69u
5377. PL.
5445,233
55.L3.i34i:
5581:33
S64252JL*
5716.94.
STICK VOLUME
(IN) (GALLONS)
53.50
54.00
54.50
55.00
55.50
56.00
56.50
57.00
57.50
58.00
58.50
59.00
59.50
60.00
6O.50
61.00
61.50
62.00
62.50
63.00
63.50
64.00
64.50
65.00
65.50
66.00
66.50
67; oo
67; 50
68.00
68.50
69.. 00
69.50
70. 00
70.50
71.0O
71; 50.
72.00,
72. SO
73; 00
731 5O
7* it 00;
74*500
75iOO>
75,50,
76j,00
76;, 50
77^ PO
77-.50:
78.00
78.50
79-. OO
79 . 50
5784.54
5851.98
5919.27
5986.38
6053.31
6120.04
6186.58
6252. 90
6319.00
6384.87
6450.48
6515. 85
6580.94
6645. 76
6710.28
6774.51
6838.42
6902.01
6965.26
7028. 17
7090.72
7152.90
7214.70
7276.11
7337. 12
7397.71
7457.87
7317.59
7376.86
7635.66
7693. 98
7731 . SO
7809. 12
7865.92.
7922. 19
7977. 90
8033. 05
8087.62
8141.61
8154. 9B
8247. 73
8299.85
B331>31<.
84 O2. 1O
8452. 20,'
8501.59
8550,, 25-
8^98^17
8645.31
8691.66
8737.20,
8781.91
8825.73
STICK VOLUMI
(IN) (GALLONS.
30.00
80-50
31. -00
31. -50
32.00
32.30
83.00
33. 50
34.00
34-. 50
35. 00-
85. 3O
86.00
36.50
87.00
37.50
38.00.
38.50
39.00
89.50
90.00
90.30
91.00
91.30
92.0JO
3868.6"
3910.7:
8951.8
3991.9-
9031.0'
9069.2
9106.2'
9142.31
9177.11
9210.9-
9243. 4(
9274. 7f
9304. 7f
9333. 4<
9360. 5C
9386.2:
9410.2;
9432. 5<
9453. Of
947 1. 4'
9487.7-
9501.5.
9512.0-
9518:6.
9519.6.
-------
Fiberglas* (Dipstick) Conversion Table
y = - 72.282 + 37.483x + 2.2042xA2 - 1.5983e-2xA3 RA2 = 1.000
Emco Conversion Table
y = -72.356 + 37.494x + 2.2038xA2 - 1.5979e-2xA3 RA2 = 1.000
10000
8000-
6000-
03
OJD
0>
4000-
2000-
This is an overlay graph of the Fiberglas*
Conversion Table and the Emco Conversion
Table. Both graphs are almost identical.
20
40
60
80
100
I
3
P.
H-
X
o
Inches of Fuel
-------
4-
3-
Difference in Gallons Between the
Emco Conversion Table and the
Fiberglas* Conversion Table
(Emco Gallons - Fiberglas* Gallons)
en
2-
Q>
1 -
0 -
-1 -
•?.*•
,% - ••. >*• /• "
- >•
• •
•
-2-
-3-
-4-
-5
20
40
60
80
Stick Total (in)
100
(D
D
0.
H-
00
-------
c
Ol
WJ
C
O
40
30-
20-
10 -
0 -
-10-
-20-
-30-
-40
Percent Difference Between
Emco Conversion Table Gallons and
Fiberglas* Conversion Table Gallons
((Emco Gallons - Fiberglas* Gallons)/ Emco Gallons) x 100
100
Inches of Fuel
200
0>
9
P.
H-
X
w
-------
-20-
Appendix F
Comparison of Emco and Dipstick Readings
-------
Cfl
-------
90-
80-
70-
Tank 2 Comparison of EFTMS and
Dipstick Readings
O)
fa
I
60-
50-
40-
30-
EFTMS
-*— Dipstick
20-
10-
i
10
20
30
40
50
Reading Sequence
-------
O)
C4-I
O
-------
Tank 4 Comparison of EFTMS and
Dipstick Readings
fe
«<-
o
en
90-
80-
70-
60-
50 -
40-
30-
20-
10-
EFTMS
-*— Dipstick
10
20
30
40
50
Reading Sequence
to
-e-
-------
0)
3
fe
*0
tfl
J3
0
90-
80-
70-
60-
50-
40-
30-
20-
10-
Tank 5 Comparison of EFTMS and
Dipstick Readings
-• EFTMS
-*— Dipstick
10
20
30
40
50
Reading Sequence
NO
Ul
-------
90-
80-
Tank 6 Comparison of EFTMS and
Dipstick Readings
s
fe
en
O>
70-
60-
50-
40-
30-
20-
10-
EFTMS
-*— Dipstick
10
20
30
40
50
Reading Sequence
OS
I
-------
OJ
o
OJ
c
90-
80-
70-
60-
50-
40-
30-
20-
10-
Tank 7 Comparison of EFTMS and
Dipstick Readings
EFTMS
-*— Dipstick
10
20
30
40
50
Reading Sequence
ro
-^i
i
-------
Tank 8 Comparison of EFTMS and
Dipstick Readings
CL>
3
fe
tw
0)
90-
80-
70-
60-
50-
40-
30-
20-
10-
EFTMS
Dipstick
10
20
30
40
50
Reading Sequence
OO
-------
Tanks 1-8 Readings, Emco and Dipstick
Percent Differences (inches)
0)
a
u
C
a
C
a>
u
S.
O)
Cu
0-
-5-
-10-
-15-
-20-
-25'
10
20
30
40
50
Reading Sequence
Tankl
Tank 2
TankS
Tank 4
Tank5
Tank 6
Tank?
TankS
•e
§
d
H-
X
Q
ro
v£>
i
-------
Tanks 1-8 Readings, Emco and Dipstick
Full Scale Percent Difference (inches)
u
s-l
M
73
u
C/3
0-
-1 -
-2-
-3-
10
20
30
40
50
Tankl
Tank 2
TankS
Tank 4
TankS
Tank 6
Tank?
TankS
Reading Sequence
I
§
a
H-
x
w
u>
o
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-31-
Appeadix I
This appendix lists the volume measurement differences between
the EFTMS and the dipstick method. Please note that the volume of
one tank is 10,000 gallons and the following equation was used to
calculate the full scale percent difference:
((Emco gallons - Dipstick gallons)/10,000) x 100
Tank 1
Largest Measurement Difference: 1.51 in.
Corresponding Measurement Difference in Gallons: 177.79 gal.
Full Scale Percent Difference in Gallons: 1.80%
Tank 2
Largest Measurement Difference: 2.55 in.
Corresponding Measurement Difference in Gallons: 322.76 gal.
Full Scale Percent Difference in Gallons: 3.23%
Tank 3
Largest Measurement Difference: 2.23 in.
Corresponding Measurement Difference in Gallons: 270 gal.
Full Scale Percent Difference in Gallons: 2.70%
Tank 4
Largest Measurement Difference: 1.96 in.
Corresponding Measurement Difference in Gallons: 219.44 gal.
Full Scale Percent Difference in Gallons: 2.19%
Tank 5
Largest Measurement Difference: 1.20 in.
Corresponding Measurement Difference in Gallons: 86.78 gal.
Full Scale Percent Difference in Gallons: 0.87%
Tank 6
Largest Measurement Difference: 3.13 in.
Corresponding Measurement Difference in Gallons: 359.55 gal.
Full Scale Percent Difference in Gallons: 3.60%
Tank 7
Largest Measurement Difference: 1.87 in.
Corresponding Measurement Difference in Gallons: 268.06 gal.
Full Scale Percent Difference in Gallons: 2.68%
Tank 8
Largest Measurement Difference: 2.58 in.
Corresponding Measurement Difference in Gallons: 174.28 gal.
Full Scale Percent Difference in Gallons: 1.74%
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-32-
Graph of EFTMS Conversion Table
(0
e
3
y = • 72.356 + 37.494x + 2.2Q38xA2 - 1 J979c-2x^3 RA2 = 1.000
10000
8000 H
6000
4000 H
2000
This overall graph was broken into 9
different ranges so that a better best fit
curve could be calculated for each range.
20
40
60
80
100
Fual Depth (inches)
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-33-
Calculated Manufacturer' s Volume
Measuring Accuracies
y= Fuel Voluma (gallons)
x=Fuel Laval (inchas)
Range #1: (0-10.5 inches of fuel)
Governing Equation: y = -6.0139 + 9.4618x + 5.3897x2 - .14028x3
Accuracy: ±.531 gallons
Range #2: (10.5-20.5 inches of fuel)
Governing Equation: y = -74.428 + 32.453x + 2.6205x2 - . 0239x3
Accuracy: ±.949 gallons
Range #3: (20.5-30.5 inches of fuel)
Governing Equation: y = -157.67 + 44.107x + 2.0773x2 - .01547x3
Accuracy: ±1.19 gallons
Range #4: (30.5-40.5 inches of fuel)
Governing Equation: y = -283.72 + 54.935x + 1.7729x2 - .01269x3
Accuracy: ±1.32 gallons
Range #5: (40.5-50.5 inches of fuel)
Governing Equation: y = -86.454 + 40.872x + 2.1053x2 - .0153x3
Accuracy: ±1.37 gallons
Range #6: (50.5-60.5 inches of fuel)
Governing Equation: y = -228.59 + 50.806x + 1.879x2 - .0136x3
Accuracy: ±1.70 gallons
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-34-
Range #7: (60.5-70.5' inches of fuel)
Governing Equation: y = 350.71 + 22.113x + 2.3537x2 - .016223x3
Accuracy: ±1.22 gallons
Range #8: (70.5-80.5 inches of fuel)
Governing Equation: y = 3671.6 - 116.Six + 4.2926x2 - .02526x3
Accuracy: ±1.01 gallons
Range #9: (80.5-92 inches of fuel)
Governing Equation: y = 69112 + 2462x + 32.309x2 - .13683x3
Accuracy: ±.65 gallons
Summary of Results
Greatest Accuracy: ±.531 gallons (0-10.5 inches of fuel)
Lowest Accuracy: ±1.70 gallons (50.5-60.5 inches of fuel)
As can be seen from these results, the volume measuring accuracy
is least accurate when the storage tank is approximately half full.
However, the worst accuracy of ±1.70 gallons only represents .017%
error for the entire tank volume.
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-35-
Appendix K
Actual EFTMS Volume Measuring DATA
Tank #1 (Fleet Gasoline)
Original Gallons of Fuel: 4931
Original Inches of Fuel: 47.25
Total Gallons Removed EFTMS Measured Volume (gal.) EFTMS Measured Fuel Inches
5 4927 47.22
10 4922 47.18
15 4917 47.15
20 4911 47.11
5 Gallon Increments: (0-5 gal interval) 4 gal. removal indicated
(15-20 gal interval) 6 gal. removal indicated
Final Difference from Original Volume: 20 gallons
Tank #2 (Oxygenated Test Gasoline)
Original Gallons of Fuel: 2392
Original Inches of Fuel: 28.21
Total Gallons Removed EFTMS Measured Volume (pal.) EFTMS Measured Fuel Inches
5 2387 28.17
10 2382 28.13
15 2377 28.10
20 2372 28.06
5 Gallon Increments: No Discrepancies
Final Difference from Original Volume: 20 gallon
Tank #3 (Unleaded Test Gasoline (96 Ron))
Original Gallons of Fuel: 564
Original Inches of Fuel: 10.96
Total Gallons Removed EFTMS Measured Volume (
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-36-
5 Gallon Increments: (5-10 gal interval) 4 gal. removal indicated
Final Difference from Original Volume: 19 gallons
Tank #4 (Gasoho1 Test Fuel)
Original Gallons of Fuel: 566
Original Inches of Fuel: 10.97
Total Gallons Removed EFTMS Measured Volume (gal.) EFTMS Measured Fuel Inches
5 560 10.91
10 556 10.85
15 550 10.80
20 546 10.74
5 Gallon Increments: (0-5 gal interval) 6 gal. removal indicated
(5-10 gal interval) 4 gal. removal indicated
(10-15 gal interval) 6 gal. removal indicated
(15-20 gal interval) 4 gal. removal indicated
Final Difference from Original Volume: 20 gallons
Tank #5 (Diesel Test Fuel)
Original Gallons of Fuel: 628
Original Inches of Fuel: 11.74
Total Gallons Removed EFTMS Measured Volume (gal.) EFTMS Measured Fuel Inches
5 623 11.68
10 619 11.63
15 614 11.57
20 609 11.51
5 Gallon Increments: (5-10 gal interval) 4 gal. removal indicated
Final Difference from Original Volume: 19 gallons
Tank #6 (Excess Test Fuel)
Original Gallons of Fuel: 5045
Original Inches of Fuel: 63.31
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-37-
Total Gallons Added
5
10
15
20
EFTMS Measured Volume (gal.)
5049
5056
5060
5066
5 Gallon Increments: (0-5 gal interval)
(5-10 gal interval)
(10-15 gal interval)
EFTMS Measured Fuel Inches
63.35
62.78
62.55
62.21
(15-20 gal interval)
Final Difference from Original Volume: 21 gallons
4 gal. removal indicated
7 gal. removal indicated
4 gal. removal indicated
6 gal. removal indicated
Tank #7 (Unleaded Commercial Test Gasoline)
Original Gallons of Fuel: 4332
Original Inches of Fuel: 42.89
Total Gallons Removed
5
10
15
20
EFTMS Measured Volume (gal .
4327
4322
4318
4312
EFTMS Measured Fuel Inches
42.86
42.82
42.78
42.74
5 Gallon Increments: (10-15 gal interval)
(15-20 gal interval)
4 gal. removal indicated
6 gal. remov indicated
Final Difference from Original Volume: 20 gallons
Tank #8 (Unleaded Test Gasoline (96 Ron))
Original Gallons of Fuel: 4838
Original Inches of Fuel: 46.57
Total Gallons Removed
5
10
15
20
EFTMS Measured Volume (gal.)
4833
4828
4822
4827
EFTMS Measured Fuel Inches
46.53
46.50
46.46
46.42
5 Gallon Increments: (10-15 gal interval)
indicated
6 gal. removal
Final Difference from Original Volume: 21 gallons
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-38-
Summary of Actual EFTMS Data
Overall 20 gallons samples
Tanks
EFTMS indicated 19 gallons removed : 3,5
EFTMS indicated 20 gallons removed: 1,2,4,7
EFTMS indicated 21 gallons removed: 6,8
Number of incidences of deviation from the 5 gallon sample:
Tank Number of Deviations
1 2
2 0
3 1
4 4
5 1
6 4
7 2
8 1
Worst Display of Accuracy : Tank #6
The EFTMS indicated a 21 gal. removal of fuel for the overall 20 gal. sample. Also a 7 gal. removal was
indicated for the 5-10 gal. interval.
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Appendix L
-39-
The following items can be set from the front panel of the Tank Level
Monitor:
1. Date and Time 6. Calibration Value
2. Shift Report Times 7. Pitch Correction
3. Manager Code 8. Tank Number
4. Station Header 9. Sensor Number
5. Alarm Levels 10. Tank Type
11. Fuel Type
The current settings as of 7/28/88 are the following:
•Shift Report Times:
•Factory Set Access Code:
•Manager Access Code:
•Station Header:
•Alarm Levels:
99:99 (disabled)
11111
97248
U.S. EPA Tank Farm
2565 Plymouth Rd.
Ann Arbor, Mi 48105
Tanks 1.2.4.5.6.7
Tanks 3.8
Low Product Level :
High Product Level:
High Water Level:
•Calibration Value:
•Probe Length:
•Pitch Correction:
500 gal. 1000 gal.
9518 gal. 9518 gal.
2 in. 2 in.
•Start Leak Test (printout) :
•Leak Test Report (printout) :
2500 (all tanks)
38850 steps (all tanks)
+0 (all tanks)
11:02:47 P.M.
5:02:59 A.M.
•Individual Tank Information:
Tank Number: 1
Probe Address: 1
Tank Table: 1
Product Code: 9
Label : FLTGAS
TC Value: .oooes
2
2
1
9
OXYTF
.000675
3456 7
3456 7
1111 1
9959 9
ULTGl GASHOL * EXCTF ULTGCM
.00068 .000675 * .00068 .00068
8
0
1
9
ULTC
.00(
*Tank 5 uses standard I2D label and TC value of DSL-12 and .000450 respectively.
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