United States
Environmental Protection
Agency
Air and Radiation
EPA420-F-99-038
October 1999
Office of Mobile Sources
vvEPA Frequently Asked
Questions
MARPOL 73/78 Annex VI Marine
Diesel Engine Requirements
The U.S. Environmental Protection Agency (EPA) is issuing this fact
sheet to advise owners and operators of marine vessels flagged,
registered, or primarily used in the United States of the marine diesel
engine requirements contained in Annex VI to the International
Convention for the Prevention of Pollution from Ships (MARPOL 73/78).
The International Maritime Organization adopted this Annex on
September 27, 1997.
Who should read this
fact sheet?
If Annex VI has not
entered into force
internationally, do I
still need a compliant
engine?
Anyone who owns, or might purchase or construct, a commercial or
recreational marine vessel with one or more marine diesel engines rated
above 130 kilowatts (kW) (175 horsepower) should read this fact sheet.
The Annex applies only to these engines.
Annex VI will enter into force internationally one year after it is ratified
by at least 15 countries representing 50 percent of the gross tonnage of
the world's merchant shipping. Until that time, however, you should still
make sure any new engine you purchase or any existing engine you
modify beginning January 1, 2000, complies with the Annex VI limits
for oxides of nitrogen (NOx). This is because after the Annex goes into
force internationally, it may be enforceable back to engines newly
installed or converted on or after that date. The actual effective date for
U.S.-flagged vessels will be decided as part of the U.S. ratification
process.
EPA has set up a voluntary certification program so engine manufactur-
ers can show that they have compliant engines. EPA expects that all new
marine diesel engines with a power output of more than 130 kW sold in
> Printed on Recycled Paper
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I never my
to foreign ports. Do
the Annex VI
requirements still
apply to me?
the United States beginning January 1, 2000, will comply with the
MARPOL Annex VI NOx limits.
Until the U.S. national program for marine diesel engines starts, the
Annex VI NOx control program will be voluntary for engines installed
on U.S.-flagged vessels that do not go to foreign ports. This means that
engine manufacturers are encouraged to make Annex VI compliant
engines available, and you are encouraged to purchase them when you
buy new engines for a new vessel.
However, the requirements of the Annex may apply to your vessel once
the Annex goes into force for the United States. The applicability of the
Annex to U.S.-flagged vessels built on or after January 1, 2000, but prior
to date the Annex goes into force internationally, will be decided as part
of the U.S. ratification process. You can obtain more information about
the status of the U.S. national program and other requirements of the
Annex by contacting the individual listed at the end of this fact sheet.
is
73/78?
What is Annex VI?
What are the
Annex VI NOx
requirements?
The
MARPOL 73/78 is the International Convention for the Prevention of
Pollution from Ships. This international treaty was originally adopted by
the International Maritime Organization (IMO) in 1973 and revised in
1978. Its goal is to reduce pollution from all aspects of marine vessel
operation. To achieve this goal, the Treaty and its Annexes contain
requirements to control the accidental or deliberate discharge of sub-
stances such as oil, chemicals, and garbage. It also sets incineration
requirements.
Annex VI, adopted by the Parties to MARPOL in 1997, limits air pollu-
tion from ships. These provisions affect ozone-depleting substances,
NOx, sulfur oxides (SOx), volatile organic compounds (VOCs), ship-
board incineration, reception facilities, and fuel oil quality.
The Annex VI NOx requirements are found in Regulation 13, which sets
emission limits for marine diesel engines rated above 130 kW. These
limits (given in grams per kilowatt-hour) are based on a curve (the NOx
curve), which is described by the following formula that varies with
rated engine speed (n in crankcase revolutions per minute):
- 17 g/kW-hr
-45.0xn(-0.2)g/kW-hr
- 9.8 g/kW-hr
for n < 130 rpm
for 130 < n< 2000 rpm
for n > 2000 rpm
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18
17
16
15
14
13
12
11
10
9
Maximum Allowable NOx Emissions
For Marine Diesel Engines
(Regulation 13 NOx Curve)
zio
759 1000 1250
Rated Engine Speed ("n")
'l7SO'
201)0
Do the Annex VI NOx
limits apply only to
new marine diesel
engines?
The Annex VI NOx limits apply to new marine diesel engines and, in
some cases, to existing engines. The Annex specifies that any new
engine installed on a vessel constructed on or after January 1, 2000,
must comply with the Annex VI NOx limits. Any existing engine that
undergoes a major conversion on or after January 1, 2000, must also
comply with the Annex VI NOx limits, no matter when that engine was
originally manufactured.
Major conversion means:
(1) the engine is replaced by a new engine built on or after January 1,
2000; or
(2) the engine is substantially modified in any way that may increase
NOx emissions; or
(3) the maximum continuous rating of the engine is increased by more
than 10 percent.
I am buying a new
marine diesel engine.
How do I know if this
engine complies with
the Annex VI NOx
limits?
Demonstrating Compliance
The engine manufacturer will demonstrate that a new engine complies
with the MARPOL Annex VI NOx limits. The manufacturer will provide
test data and other information to EPA. After receiving this information,
we will issue one of two documents:
• Statement of Voluntary Compliance—issued prior to entry into
force of the Annex; or
• Engine International Air Pollution Prevention Certificate (EIAPP^ -
issued after entry into force of the Annex.
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I am having my engine
overhauled. Do I to
sure the modified
engine corn-piles with
the Annex VI NOx limits
and, if so, how do I do
this?
You should receive a copy of one of these documents, as well as the
Technical File when you receive the engine. These are very important
documents; if you take your vessel to foreign ports, you must keep
them onboard the vessel at all times. They are described in greater
detail below.
Whether or not you must have your overhauled engine certified to the
MAKPOL Annex VI NOx limits depends on how you use your vessel
and the type of overhaul.
Vessel Application. Your engine will be exempt from the MARPOL
Annex VI engine overhaul requirements if you never take your vessel
to a foreign port. However, your engine will be subject to the rebuild,
remanufacturing, and replacement provisions in the national marine
diesel rule after that rule goes into effect.
Type of Overhaul. If your engine meets the criteria for major conver-
sion described above and it is overhauled on or after January 1, 2000,
it must comply with the Annex VI NOx limits.
To demonstrate compliance:
• You should insist that the company making the modification
certify that the modified engine complies with the NOx limits. To
do this, the company making the modification will submit emis-
sions data or other information to EPA. EPA will then issue a
revised Statement of Voluntary Compliance or EIAPP for that
engine.
• If you are doing the overhaul yourself, you should contact EPA
ahead of time to find out what kind of information and data you
will need to send EPA to demonstrate that your modified engine
complies with the Annex VI NOx limits.
I operate my U.S.-flagged
internationally.
Which emission limits do
my engines have to meet
after the U.S. national
program goes into effect?
for Go to
After the U.S. national program goes into effect, your engines must
meet the national emission limits. You may apply for a waiver from
the domestic program if your vessel meets certain criteria. The contact
listed at the end of this fact sheet can help you determine if you
qualify for a waiver.
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If I do not qualify for a waiv-
er and my engines must
the domestic emis-
sion limits, am I still affect-
ed by MARPOL Annex ¥1?
Yes. If you take your vessel to foreign ports, you must comply with
the provisions of MAKPOL Annex VI after it goes into force inter-
nationally.
If I do not qualify for a
waiver and my engines
must the domestic
emission limits, how will I
demonstrate compliance
with MARPOL?
Demonstrating compliance will be the same as for the Annex VI
limits. The engine manufacturer must demonstrate that a new engine
complies with the U.S. emission limits and obtain either a Statement
of Voluntary Compliance or an EIAPP from EPA. You should
receive a copy of one of these documents, as well as the Technical
File, when you receive the engine. These are very important docu-
ments; if you take your vessel to foreign ports, you must keep them
onboard the vessel at all times. They are described in greater detail
below.
What are the MARPOL
Annex VI surveys?
Which vessels will be
subject to MARPOL Annex
VI surveys?
Will vessels and engines
be surveyed before Annex
VI into force inter-
nationally?
IVIARPOL Annex VI and
Requirements
The MARPOL Annex VI surveys are a set of inspections to ensure
that your vessel and engine comply with the Annex requirements. In
the United States, the Coast Guard will typically conduct these
inspections. In foreign ports, the inspections will be done by the
Administration of that country or a delegated authority.
Annex VI survey requirements apply to ships of 400 gross tonnage
or above and fixed and floating drilling rigs and other platforms.
Surveys will cover all aspects of Annex VI requirements, not just
engine NOx emissions.
A country may decide to require inspections and surveys after it
ratifies the Annex. Before the Annex goes into force for that coun-
try, however, it is not clear if countries will do this. If your vessel is
larger than 400 gross tons, you should consult with the U.S. Coast
Guard about survey and inspection requirements prior to entry into
force of the Annex.
When will ships be
surveyed?
Annex VI contains a schedule of surveys that occur throughout the
life of a vessel. These include:
Initial survey: This survey occurs before the ship is put into
service or before a vessel certificate is issued for the first time.
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This survey ensures that the equipment, systems, fitting, arrange-
ments and material used onboard fully comply with the require-
ments of Annex VI. The vessel's International Air Pollution Preven-
tion certificate (IAPP) will be issued to the vessel by the U.S. Coast
Guard, or an organization authorized to act on its behalf, after this
survey.
• Periodic surveys: These surveys occur at least every five years after
the initial survey. These surveys confirm that nothing has been done
to the ship's equipment that would take it out of compliance. The
vessel's IAPP certificate will be re-issued by the U.S. Coast Guard,
or an organization authorized to act on its behalf, after this survey.
* Intermediate surveys: These surveys occur at least once during the
period between issuance of an IAPP and the periodic surveys. They
also confirm that all of the ship's equipment remains in compliance.
When will engines be Engine surveys are described in Chapter 2 of the NOx Technical Code, a
surveyed? supporting document to Annex VI There are four kinds of engine
surveys:
• Pre-certification survey: This survey occurs before an engine is
installed onboard a vessel, to ensure the engine meets the NOx
limits. The Engine International Air Pollution Prevention certificate
(EIAPP) is issued by EPA after this survey for each applicable
engine, engine family, or engine group.
• Initial certification survey: This survey occurs after the engine is
installed onboard the ship, but before the ship is placed into service.
It ensures that the engine meets the NOx limits as installed.
- If an engine has an EIAPP, the initial certification survey will
primarily ensure that any modifications to the engine's settings
are within the allowable adjustment limits specified in the
EIAPP.
- Some engines are uniquely built or are so large that they cannot
be tested on a test bed. The initial certification survey will be
more comprehensive for these engines, since they have no prior
test results.
• Periodic and intermediate surveys: These surveys occur as part of
the ship's surveys described above. They ensure that the engine
continues to comply fully with the NOx limits.
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Are there record
keeping requirements
to simplify
surveys?
• Modification survey: This survey occurs when an engine overhaul
meets the criteria for a major conversion. It ensures that the modi-
fied engine complies with the NOx limits.
There are three documents that are essential for completing the engine
and vessel surveys. These are the EIAPP or Statement of Compliance,
the Technical File, and the Record Book of Engine Parameters. These
are described below.
What is an IAPP?
of HARPOL Terms
The International Air Pollution Prevention certificate (IAPP) is issued to
the vessel by the U.S. Coast Guard, or an organization authorized to act
on its behalf, after the owner demonstrates that the vessel complies will
all relevant requirements under MARPOL Annex VI. The IAPP is valid
for five years, and is subject to successful completion of the vessel
surveys described above. These certificates will not be issued until the
Annex enters into force under Article 15 of the MARPOL Convention.
is an
The Engine International Air Pollution Prevention certificate (EIAPP) is
issued by the EPA for each applicable engine, engine family, or engine
group after the engine manufacturer demonstrates that the engine com-
plies with the NOx limits set out in Regulation 13 of Annex VI. The
EIAPP is good for the life of the engine or until it undergoes a major
conversion. These certificates will not be issued until the Annex enters
into force under Article 15 of the MARPOL Convention.
What is a Statement of
Voluntary Compliance?
What is the Technical
File?
The Statement of Voluntary Compliance is a document issued by EPA
prior to entry into force of the Annex, after the engine manufacturer
demonstrates that the engine complies with the NOx limits set out in
Regulation 13 of Annex VI. Once the Annex goes into force, this state-
ment must be exchanged for an EIAPP.
The Technical File is a record containing all details of parameters,
including components and settings, that may influence the NOx emis-
sions of the engine. According to the NOx Technical Code, the Techni-
cal File must contain the following information:
• identification of those components, settings and operating values of
the engine that influence its NOx emissions
• identification of the full range of allowable adjustments or alterna-
tives for the components of the engine
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* the full record of the engine's performance, including the engine's rated
speed and rated power
• a system of onboard NOx verification procedures to verify compliance
with the NOx emission limits during onboard verification surveys
• a copy of the emission test report used to certify the engine
• if applicable, the designation and restrictions for an engine that is a
member of an engine group or engine family
« spare part component specifications, to ensure continued compliance of
the engine with the NOx emission limits when these components are
replaced
• the EIAPP or Statement of Voluntary Compliance
The Technical File contains essential information that will be used in an
engine inspection or survey. You must keep it onboard the vessel at all times.
What is The Record The Record Book of Engine Parameters is a document for recording all
Book of Engine parameter changes, including components and engine settings, that may
Parameters? influence NOx emissions. This is another essential document for surveys
and inspections because it contains a record of adjustments to the engine. In
some cases, a survey will consist simply of examining the Record Book to
ensure that no changes have been made to the engine that might affect NOx
emissions.
Vessel owners must make sure the Record Book is always accurate. If the
settings on the engine do not match those in the record book, an engine
survey may include a more time-consuming investigation and, potentially,
onboard measurement of NOx emissions.
For
Copies of MARPOL Annex VI and the NOx Technical Code are available on
the Office of Mobile Sources' marine web site at:
www.epa.gov/oms/marine.htm
For further information about these programs or to find a Coast Guard
representative, please contact Jean Marie Revelt at:
U.S. Environmental Protection Agency
Office of Mobile Sources
2000 Traverwood Drive
Ann Arbor, MI 48105
734-214-4822
Email: revelt.jean-marie@epa.gov
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