Chapter 6- PROCEDURES FOR DEMONSTRATING COMPLIANCE WITH NOx EMISSION LIMITS ON BOARD
6.1 GENERAL
After installation of a pre-certificated engine on board a ship, every marine diesel engine shall ruse on-board verification surveys conducted as specified in 2.1.1 .2 to 2.1.1.4 to verify that the engines continue to comply with the NOx emission limits contained in regulation 13 of Annex VI. Such verification of compliance may be determined by using one of the following methods:
.1 engine parameter check method in accordance with 6.2 to verity that air engine's component, settings and operating values have trot deviated from the specifications in the engines Technical File;
.2 simplified measurement method in accordance with 6.3; or
.3 the direct measurement and monitoring method in accordance with 2.3.4 to 2.3.7, 2.7.11, 2.4.4 and 5.5.1.
6.2 ENGINE PARAMETER CHECK METHOD
6.2.1 General
6.2.1.1 Engines that meet the following conditions shall be eligible for an engine parameter check method:
.1 engines that have received a pre-certificate (EIAPP Certificate) on the test bed and those that received a certificate (IAPP Certificate) following an initial certification survey; and
.2 engines that have undergone modifications or adjustments to the designate engine components and adjustable features since they were last surveyed.
6.2.1.2 An engine parameter check method shall be conducted on engines, subject to 6.2.1.1, whenever there is a change of components and/or adjustable features of the engine that affect NOx emission levels. This method shall be used so confirm compliance with the NOx emission limits. Engines installed in ships shall be designed in advance for an easy check of components, adjustable features and engine parameters that affect NOx emission levels.
6.2.1.3 In addition, when a diesel engine is designed so run within the prescribed NOx emission limits, it is moat likely that within the marine life of the engine, the NOx emission limits may be adhered to regardless of the engines wear and tear or lack of proper maintenance. The prescribed NOx emission limits may, however, be contravened by adjustments or modification to the engine. Therefore, an engine parameter cheek method shall be used so verify whether the engine is still within the prescribed NOx emission limits.
6.2.1.4 Engine component checks, including checks of settings sod an engine's operating values, are intended to provide an easy means of deducing the emissions performance of the engine for the purpose of verification that an engine with no, or minor, adjustments or modifications complies with the applicable NOx emission limits.
MEPC 39/6/1
ANNEX
Page 31
6.2.1.5 The purpose of such checks is to provide a ready means of determining that an engine is correctly adjusted in accordance with the manufacturer's specification and remains in a condition of adjustment consistent with the initial certification by the Administration as compliant with regulation 13 of Annex VI.
6.2.1.6 If an electronic engine management system is employed, this shall be evaluated against the original settings to ensure that appropriate parameters are operating within "as built" limits.
6.2.1.7 It is not always necessary to measure the NOx level to know that an engine still fulfils the NOx emission limits. It is sufficient to know that the present state of the engine corresponds to the state as the time of initial certification. If the results of an engine parameter check method prove the engine so be in sufficient condition to fulfill the NOx emission limits, the engine shall be re-certified without direct NOx measurement.
6.2.2 Procedures for an engine parameter cheek method
6.2.2.1 An engine parameter check method shall be carried out using the two procedures as follows:
.1 a documentation inspection of engine parameter(s) shall be carried out in addition to other inspections and include inspection of record books covering engine parameters and verification that engine parameters are within the range of allowable conditions specified in an engines technical File; and
.2 an actual inspection of engine components and adjustable features shall be carried out in addition to the documentation inspection as necessary. The necessary engine features shall be selected with as actual inspection carried out. It shall then be verified, referring to the results of the documentation inspections, that the engine adjustable features are within the range of allowable conditions specified in an engines Technical File.
61.2.2 The surveyor shall have the option of checking one or all of the identified components, settings or operating values to ensure that the engine with no, or minor, adjustments or modifications complies wish the applicable emission limits and that only components of the current specification are being used. Where adjustments and/or modifications in a specification are referenced in the Technical File, they must fall within the range recommended by the manufacturer and approved by the Administration.
6.2.3 Documentation for an engine parameter check method
6.2.3.1 Every marine diesel shall base a Technical File which identifies the engines components, settings or operating values which influence exhaust emissions and must be checked to ensure compliance.
6.2.3.2 To ensure compliance, the Technical File shall also identify those spare parts/components which must be: designed to meet the engine manufacturer's current specification, supplied by the manufacturer or licensed by the engine manufacturer .
6.2.3.3 Shipowners or persons responsible for ships equipped with diesel engines required to undergo an engine parameter check method shall maintain on board the following documentation:
