2.3.1 For those engines that have not been adjusted
or modified relative to the original specification of the manufacturer,
the provision of a valid EIAPP Certificate should suffice to demonstrate
compliance with the applicable NOx limits.
2.3.2 After installation on board, it shall be
determined to what extent an engine has been subjected to further
adjustments and/or modifications that could affect the NOx emission.
Therefore, the engine, after installation on board, but prior to issuance
of the IAPP Certificate, shall be inspected for modifications and
be approved using the onboard NOx verification procedures
and one of the methods described in 2.1.2.
2.3.3 There are engines that, after pre-certification,
need final adjustment or modification for performance. In such a case,
the engine Group concept could be used to ensure that the engine still
complies with the applicable limit.
2.3.4 Every marine diesel engine installed on
board a ship shall be provided with a technical file. The technical
file shall be prepared by the applicant for engine certification and
approved by the Administration, and is required to accompany an engine
throughout its life on board ships. The technical file shall contain
the information as specified in 2.4.1.
2.3.5 Where a NOx reducing device is
installed and needed to comply with the NOx limits, one
of the options providing a ready means for verifying compliance with regulation 13 is the direct measurement
and monitoring method in accordance with 6.4.
However, depending on the technical possibilities of the device used,
subject to the approval of the Administration, other relevant parameters
could be monitored.
2.3.6 Where, for the purpose of achieving NOx compliance,
an additional substance is introduced, such as ammonia, urea, steam,
water, fuel additives, etc., a means of monitoring the consumption
of such substance shall be provided. The technical file shall provide
sufficient information to allow a ready means of demonstrating that
the consumption of such additional substances is consistent with achieving
compliance with the applicable NOx limit.
2.3.7 Where the engine parameter check method
in accordance with 6.2 is used to
verify compliance, if any adjustments or modifications are made to
an engine after its pre-certification, a full record of such adjustments
or modifications shall be recorded in the engine’s record book
of engine parameters.
2.3.8 If all of the engines installed on board
are verified to remain within the parameters, components, and adjustable
features recorded in the technical file, the engines should be accepted
as performing within the applicable NOx limit specified
in regulation 13. In this case,
provided all other applicable requirements of the Annex are complied
with, an IAPP Certificate should then be issued to the ship.
2.3.9 If any adjustment or modification is made
which is outside the approved limits documented in the technical file,
the IAPP Certificate may be issued only if the overall NOx emission
performance is verified to be within the required limits by: onboard
simplified measurement in accordance with 6.3;
or, reference to the test-bed testing for the relevant engine group
approval showing that the adjustments or modifications do not exceed
the applicable NOx emission limit. At surveys after the
initial engine survey, the direct measurement and monitoring method
in accordance with 6.4, as approved
by the Administration, may alternatively be used.
2.3.10 The Administration may, at its own discretion,
abbreviate or reduce all parts of the survey on board, in accordance
with this Code, to an engine that has been issued an EIAPP Certificate.
However, the entire survey on board must be completed for at least
one cylinder and/or one engine in an engine family or engine group,
if applicable, and the abbreviation may be made only if all the other
cylinders and/or engines are expected to perform in the same manner
as the surveyed engine and/or cylinder. As an alternative to the examination
of fitted components, the Administration may conduct that part of
the survey on spare parts carried on board provided they are representative
of the components fitted.
2.3.11 Guidance in respect of the survey and certification
of marine diesel engines at initial, renewal, annual and intermediate
surveys, as described in chapter 2 of
this Code, is given in the flowcharts in appendix
2 of this Code. Where discrepancies exist, the text of chapter 2 takes precedence.