Guidelines superseded by resolution MEPC.259(58)
Resolution
MEPC.184(59)
2009
GUIDELINES FOR EXHAUST GAS CLEANING SYSTEMS
(Adopted on 17 July 2009)
THE
MARINE ENVIRONMENT PROTECTION COMMITTEE,
RECALLING
Article 38(a) of the Convention on the International Maritime Organization
concerning the functions of the Marine Environment Protection Committee
conferred upon it by international conventions for the prevention and control
of marine pollution,
RECALLING
ALSO that MARPOL Annex VI entered into force on 19 May 2005,
RECALLING
FURTHER resolution MEPC.170(57)
by which the Committee adopted the Guidelines for exhaust gas cleaning system,
NOTING
that the revised MARPOL Annex VI was adopted by resolution MEPC.176(58)
which is expected to enter into force on 1 July 2010,
NOTING
ALSO that regulation 4 of the revised MARPOL Annex VI allows the use of an
alternative compliance methods at least as effective in terms of emission
reductions as that required by the revised MARPOL Annex VI, including any of
the standards set forth in regulation 14, taking into account guidelines
developed by the Organization,
RECOGNIZING
the need to revise the Guidelines for exhaust gas cleaning systems, in
accordance with provisions of the revised MARPOL Annex VI,
HAVING
CONSIDERED the 2009 Guidelines for exhaust gas cleaning systems prepared by the
Sub-Committee on Bulk Liquids and Gases at its thirteenth session,
1.
ADOPTS the 2009 Guidelines for exhaust gas cleaning systems, as set out in the
Annex to this resolution;
2.
INVITES Governments to apply the 2009 Guidelines from 1 July 2010;
3.
URGES Administrations to provide for collection of data under Appendix III; and
4.
REVOKES the Guidelines adopted by resolution MEPC.170(57) as from 1 July 2010.
Annex.
2009 GUIDELINES FOR EXHAUST GAS CLEANING SYSTEMS
1.
INTRODUCTION
1.1
Regulation 14 of Annex VI to MARPOL 73/78 requires ships to use fuel oil with a
sulphur content not exceeding that stipulated in regulation 14.1 or 14.4.
Regulation 4 allows, with the approval of the Administration, the use of an
alternative compliance method at least as effective in terms of emission
reductions as that required by the Annex, including the standards set forth in
regulation 14. The Administration of a party should take into account any
relevant guidelines developed by the Organization pertaining to alternatives
provided for in regulation 4.
1.2
Similar to a NOx emission reduction system, an EGC unit may be
approved subject to periodic parameter and emission checks or the system may be
equipped with a continuous emission monitoring system. These Guidelines have
been developed with the intention of being objective and performance oriented.
Furthermore, use of the SO2 (ppm)/CO2 (%) ratio method
will simplify the monitoring of SOx emission and facilitate approval
of an EGC unit. See Appendix II for the rationale explaining the use of SO2
(ppm)/CO2 (%) as the basis for system monitoring.
1.3
Compliance should be demonstrated on the basis of the SO2(ppm)/CO2(%
v/v) ratio values.
Table 1.
Fuel oil sulphur limits recorded in regulations 14.1 and 14.4 and corresponding
emissions values
|
Fuel Oil Sulphur Content (%
m/m) |
Ratio Emission SO2(ppm)/ CO2(% v/v) |
|
4.50 |
195.0 |
|
3.50 |
151.7 |
|
1.50 |
65.0 |
|
1.00 |
43.3 |
|
0.50 |
21.7 |
|
0.10 |
4.3 |
Note: The use of
the Ratio Emissions limits is only applicable when using petroleum based
Distillate or Residual Fuel Oils. See Appendix II for application of the ratio
method.
1.4
These Guidelines are recommendatory in nature; however, Administrations are
invited to base their implementation on these Guidelines.
2.
GENERAL
2.1
Purpose
2.1.1
The purpose of these Guidelines is to specify the requirements for the testing,
survey certification and verification of exhaust gas cleaning (EGC) systems
under regulation 4 to ensure that they provide effective equivalence to
requirements of regulations 14.1 and 14.4 of Annex VI of MARPOL 73/78.
2.1.2
The Guidelines permit two schemes; Scheme A (Unit Certification with Parameter
and Emission Checks, and Scheme B (Continuous Emission Monitoring with
Parameter Checks).
2.1.3
For ships which are to use an exhaust gas cleaning system in part or in total
in order to comply with regulations 14.1 and/or 14.4 of MARPOL Annex VI there
should be an approved SOx Emissions Compliance Plan (SECP).
2.2
Application
2.2.1
These Guidelines apply to any EGC unit as fitted to fuel oil combustion
machinery, excluding shipboard incinerators, installed on board a ship.
2.3
Definitions and Required Documents
|
Fuel oil combustion unit |
Any engine, boiler, gas turbine, or other
fuel oil fired equipment, excluding shipboard incinerators |
|
EGC |
Exhaust
gas cleaning |
|
SOx |
Sulphur
oxides |
|
SO2 |
Sulphur
dioxide |
|
CO2 |
Carbon
dioxide |
|
UTC |
Universal
Time Co-ordinated |
|
Certified
Value |
The
SO2/CO2 ratio specified by the manufacturer that the
EGC unit is certified as meeting when operating on a continuous basis on the
manufacturers specified maximum fuel sulphur content |
|
In
situ |
Sampling
directly within an exhaust gas stream |
|
MCR |
Maximum
Continuous Rating |
|
Load
Range |
Maximum
rated power of diesel engine or maximum steaming rate of the boiler |
|
SECP |
SOx
Emissions Compliance Plan |
|
SECC |
SOx
Emissions Compliance Certificate |
|
ETM-A |
EGC
system – Technical Manual for Scheme A |
|
ETM-B |
EGC
system – Technical Manual for Scheme B |
|
OMM |
Onboard
Monitoring Manual |
|
EGC
Record Book |
A
record of the EGC unit in-service operating parameters, component
adjustments, maintenance and service records as appropriate |
|
Document |
Scheme A |
Scheme B |
|
SECP |
X |
X |
|
SECC |
X |
|
|
ETM
Scheme A |
X |
|
|
ETM
Scheme B |
|
X |
|
OMM |
X |
X |
|
EGC
Record Book or Electronic Logging System |
X |
X |
3.
SAFETY NOTE
3.1
Due attention is to be given to the safety implications related to the handling
and proximity of exhaust gases, the measurement equipment and the storage and
use of pressurized containers of pure and calibration gases. Sampling positions
and permanent access platforms should be such that this monitoring may be performed
safely. In locating discharge outlet of washwater used in the EGC unit, due
consideration should be given to the location of the ship’s seawater inlet. In
all operating conditions the pH should be maintained at a level that avoids
damage to the vessel’s anti-fouling system, the propeller, rudder and other
components that may be vulnerable to acidic discharges, potentially causing
accelerated corrosion of critical metal components.
4.
SCHEME A – EGC SYSTEM APPROVAL, SURVEY AND CERTIFICATION USING PARAMETER AND
EMISSION CHECKS
4.1
Approval of EGC systems
4.1.1
General
Options
under Scheme A of these Guidelines provide for:
a) Unit
approval;
b) Serially
manufactured units;
c) Production
range approval.
4.1.2
Unit approval
4.1.2.1
An EGC unit should be certified as capable of meeting the limit value, (the
Certified Value), specified by the manufacturer (e.g., the emission level the
unit is capable of achieving on a continuous basis) with fuel oils of the
manufacturer’s specified maximum % m/m sulphur content and for the range of
operating parameters, as listed in 4.2.2.1(b), for which they are to be
approved. The Certified Value should at least be suitable for ship operations
under requirements given by MARPOL Annex VI regulations 14.1 and/or 14.4.
4.1.2.2
Where testing is not to be undertaken with fuel oils of the manufacturer’s
specified maximum % m/m sulphur content, the use of two test fuels with a lower
% m/m sulphur content is permitted. The two fuels selected should have a
difference in % m/m sulphur content sufficient to demonstrate the operational
behaviour of the EGC unit and to demonstrate that the Certified Value can be
met if the EGC unit were to be operated with a fuel of the manufacturer’s
specified maximum % m/m sulphur content. In such cases a minimum of two tests,
in accordance with section 4.3 as appropriate, should be performed. These need
not be sequential and could be undertaken on two different, but identical, EGC
units.
4.1.2.3
The maximum and, if applicable, minimum exhaust gas mass flow rate of the unit
should be stated. The effect of variation of the other parameters defined in
4.2.2.1(b) should be justified by the equipment manufacturer. The effect of
variations in these factors should be assessed by testing or otherwise as appropriate.
No variation in these factors, or combination of variations in these factors,
should be such that the emission value of the EGC unit would be in excess of
the Certified Value.
4.1.2.4
Data obtained in accordance with this section should be submitted to the
Administration for approval together with the ETM-A.
4.1.3
Serially manufactured units
In
the case of nominally similar EGC units of the same mass flow ratings as that
certified under 4.1.2, and to avoid the testing of each EGC unit, the equipment
manufacturer may submit, for acceptance by the Administration, a conformity of
production arrangement. The certification of each EGC unit under this
arrangement should be subject to such surveys that the Administration may
consider necessary as to assure that each EGC unit has an emission value of not
more than the Certified Value when operated in accordance with the parameters
defined in 4.2.2.1(b).
4.1.4
Product range approval
4.1.4.1
In the case of an EGC unit of the same design, but of different maximum exhaust
gas mass flow capacities, the Administration may accept, in lieu of tests on an
EGC unit of all capacities in accordance with section 4.1.2, tests of EGC
systems of three different capacities provided that the three tests are
performed at intervals including the highest, lowest and one intermediate
capacity rating within the range.
4.1.4.2
Where there are significant differences in the design of EGC units of different
capacities, this procedure should not be applied unless it can be shown, to the
satisfaction of the Administration, that in practice those differences do not
materially alter the performance between the various EGC unit types.
4.1.4.3
For EGC units of different capacities, the sensitivity to variations in the
type of combustion machinery to which they are fitted should be detailed
together with sensitivity to the variations in the parameters listed in
4.2.2.1(b). This should be on the basis of testing, or other data as
appropriate.
4.1.4.4
The effect of changes of EGC unit capacity on washwater characteristics should
be detailed.
4.1.4.5
All supporting data obtained in accordance with this section, together with the
ETM-A for each capacity unit, should be submitted to the Administration for
approval.
4.2
Survey and certification
4.2.1
Procedures for the certification of an EGC unit
4.2.1.1
In order to meet the requirements of 4.1 either prior to, or after installation
on board, each EGC unit should be certified as meeting the Certified Value
specified by the manufacturer (e.g., the emission level the unit is capable of
achieving on a continuous basis) under the operating conditions and
restrictions as given by the EGC Technical Manual (ETM-A) as approved by the
Administration.
4.2.1.2
Determination of the Certified Value should be in accordance with the
provisions of these Guidelines.
4.2.1.3
Each EGC unit meeting the requirements of 4.2.1.1 should be issued with a SECC
by the Administration. The form of the SECC is given in Appendix I.
4.2.1.4
Application for an SECC should be made by the EGC system manufacturer,
shipowner or other party.
4.2.1.5
Any subsequent EGC units of the same design and rating as that certified under
4.2.1.1 may be issued with an SECC by the Administration without the need for
testing in accordance with 4.2.1.1 subject to section 4.1.3 of these
Guidelines.
4.2.1.6
EGC units of the same design, but with ratings different from that certified
under 4.2.1.1 may be accepted by the Administration subject to section 4.1.4 of
these Guidelines.
4.2.1.7
EGC units which treat only part of the exhaust gas flow of the uptake in which
they are fitted should be subject to special consideration by the
Administration to ensure that under all defined operating conditions that the
overall emission value of the exhaust gas down stream of the system is no more
than the Certified Value.
4.2.2
EGC System Technical Manual "Scheme A" (ETM-A).
4.2.2.1
Each EGC unit should be supplied with an ETM-A provided by the manufacturer.
This ETM-A should, as a minimum, contain the following information:
(a) the
identification of the unit (manufacturer, model/type, serial number and other
details as necessary) including a description of the unit and any required
ancillary systems;
(b) the
operating limits, or range of operating values, for which the unit is
certified. These should, as a minimum, include:
(i) maximum and,
if applicable, minimum mass flow rate of exhaust gas;
(ii) the power,
type and other relevant parameters of the fuel oil combustion unit for which
the EGC unit is to be fitted. In the cases of boilers, the maximum air/fuel
ratio at 100% load should also be given. In the cases of diesel engines whether
the engine is of 2 or 4-stroke cycle;
(iii) maximum
and minimum washwater flow rate, inlet pressures and minimum inlet water
alkalinity (ISO 9963-1-2);
(iv) exhaust gas
inlet temperature ranges and maximum and minimum exhaust gas outlet temperature
with the EGC unit in operation;
(v) exhaust gas
differential pressure range and the maximum exhaust gas inlet pressure with the
fuel oil combustion unit operating at MCR or 80% of power rating whichever is
appropriate;
(vi) salinity
levels or fresh water elements necessary to provide adequate neutralizing
agents; and
(vii) other
factors concerning the design and operation of the EGC unit relevant to
achieving a maximum emission value no higher than the Certified Value;
(c) any
requirements or restrictions applicable to the EGC unit or associated equipment
necessary to enable the unit to achieve a maximum emission value no higher than
the Certified Value;
(d) maintenance,
service or adjustment requirements in order that the EGC unit can continue to
achieve a maximum emission value no higher than the Certified Value. The
maintenance, servicing and adjustments should be recorded in the EGC Record
Book;
(e) corrective
actions in case of exceedances of the applicable maximum allowable SO2/CO2
ratio, or wash water discharge criteria;
(f) a
verification procedure to be used at surveys to ensure that its performance is
maintained and that the unit is used as required (see section 4.4);
(g) through
range performance variation in washwater characteristics; (h) design
requirements of the washwater system; and
(i) the SECC.
4.2.2.2
The ETM-A should be approved by the Administration.
4.2.2.3
The ETM-A should be retained on board the ship onto which the EGC unit is
fitted. The ETM-A should be available for surveys as required.
4.2.2.4
Amendments to the ETM-A which reflect EGC unit changes that affect performance
with respect to emissions to air and/or water should be approved by the
Administration. Where additions, deletions or amendments to the ETM-A are
separate to the ETM-A as initially approved, they should be retained with the
ETM-A and should be considered as part of the ETM-A.
4.2.3
In service surveys
4.2.3.1
The EGC unit should be subject to survey on installation and at Initial,
Annual/Intermediate and Renewals Surveys by the Administration.
4.2.3.2
In accordance with MARPOL Annex VI regulation 10, EGC units may also be subject
to inspection by port State control.
4.2.3.3
Prior to use each EGC unit should be issued with an SECC by the Administration.
4.2.3.4
Following the installation survey as required by 4.2.3.1, section 2.6 of the
Supplement to the ship’s International Air Pollution Certificate should be duly
completed.
4.3
Emission limits
4.3.1
Each EGC unit should be capable of reducing emissions to equal to or less than
the Certified Value at any load point when operated in accordance with the
criteria as given within 4.2.2.1(b), as specified in paragraphs 4.3.2 to 4.3.5
of these Guidelines, and as excepted in paragraph 4.3.7.
4.3.2
EGC units fitted to main propulsion diesel engines should meet the requirements
of 4.3.1 at all loads between 25-100% of the load range of the engines to which
they are fitted.
4.3.3
EGC units fitted to auxiliary diesel engines should meet the requirements of
4.3.1 at all loads between 10-100% of the load range of the engines to which
they are fitted.
4.3.4
EGC units fitted to diesel engines which supply power for both main propulsion
and auxiliary purposes should meet the requirements of 4.3.3.
4.3.5
EGC units fitted to boilers should meet the requirements of 4.3.1 at all loads
between 10-100% of the load range (steaming rates) or, if the turn down ratio
is smaller, over the actual load range of the boilers to which they are fitted.
4.3.6
In order to demonstrate performance, emission measurements should be
undertaken, with the agreement of the Administration, at a minimum of four load
points. One load point should be at 95-100% of the maximum exhaust gas mass
flow rate for which the unit is to be certified. One load point should be
within ±
5% of the
minimum exhaust gas mass flow rate for which the unit is to be certified. The
other two load points should be equally spaced between the maximum and minimum
exhaust gas mass flow rates. Where there are discontinuities in the operation
of the system the number of load points should be increased, with the agreement
of the Administration, so that it is demonstrated that the required performance
over the stated exhaust gas mass flow rate range is retained. Additional
intermediate load points should be tested if there is evidence of an emission
peak below the maximum exhaust gas mass flow rate and above, if applicable, the
minimum exhaust gas flow rate. These additional tests should be sufficient
number as to establish the emission peak value.
4.3.7
For loads below those specified in 4.3.2 to 4.3.5, the EGC unit should continue
in operation. In those cases where the fuel oil combustion equipment may be
required to operate under idling conditions, the SO2 emission
concentration (ppm) at standardized O2 concentration (15.0% diesel
engines, 3.0% boilers) should not exceed 50 ppm.
4.4
Onboard procedures for demonstrating compliance
4.4.1
For each EGC unit, the ETM-A should contain a verification procedure for use at
surveys as required. This procedure should not require specialized equipment or
an in-depth knowledge of the system. Where particular devices are required they
should be provided and maintained as part of the system. The EGC unit should be
designed in such a way as to facilitate inspection as required. The basis of
this verification procedure is that if all relevant components and operating
values or settings are within those as approved, then the performance of the
EGC system is within that required without the need for actual exhaust emission
measurements. It is also necessary to ensure that the EGC unit is fitted to a
fuel oil combustion unit for which it is rated – this forms part of the SECP. A
Technical File related to an EIAPP certificate, if available, or an Exhaust Gas
Declaration issued by the engine maker or designer or another competent party
or a Flue Gas Declaration issued by the boiler maker or designer or another
competent party serves this purpose to the satisfaction of the Administration.
4.4.2
Included in the verification procedure should be all components and operating
values or settings which may affect the operation of the EGC unit and its
ability to meet the Certified