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MEPC 49/22/Add.1
 
ANNEX 5
 
RESOLUTION MEPC.103(49)
 
Adopted on 18 July 2003
 
GUIDELINES FOR ON-BOARD NOx VERIFICATION PROCEDURE - DIRECT
MEASUREMENT AND MONITORING METHOD
 
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 (the Committee) conferred upon it by international conventions for the prevention and control of marine pollution,
 
 RECALLING ALSO that the Conference of Parties to the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating thereto (MARPOL 73/78), held in September 1997, adopted the Protocol of 1997 to amend MARPOL 73/78 with a new Annex VI on the Prevention of Air Pollution from Ships,
 
 NOTING that the 1997 Conference by resolution 2 adopted the Technical Code on Control of Emission of Nitrogen Oxides (NOx) from Marine Diesel Engines, which in paragraph 2.4.5 provides the option that on-board NOx verification procedures may be based on a NOx monitoring and recording device, approved by the Administration, based on Guidelines to be developed by the Organization,
 
 BEING AWARE that this requirement cannot be enforced before the entry into force of the Protocol of 1997,
 
 BEING AWARE ALSO of the need to develop relevant Guidelines before the entry into force of the Protocol of 1997 in preparation for the implementation of Annex VI of MARPOL 73/78,
 
 HAVING CONSIDERED the recommendation made by the Sub-Committee on Ship Design and Equipment at its forty-sixth session,
 
1. ADOPTS the Guidelines for on-board NOx verification procedure - Direct measurement and monitoring method, as set out in the Annex to this resolution;
 
2. INVITES Governments to apply the Guidelines from the date of entry into force of the Protocol of 1997.
 
ANNEX
 
GUIDELINES FOR ON-BOARD NOx VERIFICATION PROCEDURE - DIRECT
MEASUREMENT AND MONITORING METHOD
 
TABLE OF CONTENTS
 
SAFETY NOTE
 
PRINCIPLES
 
1 ANALYSING EQUIPMENT
.1 Emission species measurement
.2 Analyser specifications
.3 Pure and calibration gases
.4 Gas sampling and transfer system
 
2 ENGINE PERFORMANCE AND AMBIENT CONDITION MEASUREMENT
.1 Engine performance measurements
.2 Ambient condition measurements
.3 Engine performance and ambient condition monitoring equipment
.4 Electrical equipment: materials and design
 
3 EXHAUST EMISSION MEASUREMENT
.1 Test cycles
.2 Test condition parameter
.3 Analyser in-service performance
.4 Data for emission calculation
 
4 DATA EVALUATION
.1 Fuel composition
.2 Exhaust gas density
.3 Dry/wet correction
.4 NOx corrections for humidity and temperature
.5 Exhaust gas flow rate
.6 Calculation of emission flow rates and specific emissions
 
5 COMPLIANCE REQUIREMENTS
.1 Limit value and allowances
.2 Data for demonstrating compliance
.3 Form of approval
.4 Survey of equipment and method
 
APPENDIX 1 - Sample point connection flange
 
APPENDIX 2 - Selection of load points and revised weighting factors
 
APPENDIX 3 - Determination of power set point stability
 
GUIDELINES FOR ON-BOARD NOx VERIFICATION PROCEDURE -
DIRECT MEASUREMENT AND MONITORING METHOD
 
SAFETY NOTE
 
 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 cylindered pure and calibration gases. Sampling positions and access staging should be such that this monitoring may be performed safely and will not interfere with the engine.
 
PRINCIPLES
 
 These Guidelines are intended as an objective, performance-based document. These Guidelines are recommendatory in nature. However, national administrations are invited to base their implementation on these Guidelines. Because the direct measurement and monitoring method is one of the three permissible on-board NOx verification procedures in the NOx Technical Code (cf. NOx Technical Code, paragraph 2.4.4), its accuracy should be comparable to the other methods. Therefore, these Guidelines for approving on-board NOx monitoring and recording devices appropriately refer to the NOx Technical Code. References to the NOx Technical Code emphasize that relevant requirements are already regulated in a mandatory document, even though they are not grouped in a common chapter (e.g. "Direct measurement and monitoring method"). The values determined by this method may not be directly comparable with the test bed results. Of overriding importance for approval is the suitability of the NOx monitoring and recording devices for on-board use.
 
 As a general principle, an on-board NOx verification procedure should readily facilitate demonstration of compliance with regulation 13 of Annex VI of MARPOL 73/78 (Annex VI). At the same time, it should not be so burdensome as to unduly delay the ship or to require in-depth knowledge of the characteristics of a particular engine or specialist measuring devices not available on board.
 
1 ANALYSING EQUIPMENT
 
1.1 Emission species measurement
 
1.1.1 On-board NOx monitoring includes, as an absolute minimum, the measurement of gaseous emission concentrations of NOx (as NO + NO2).
 
1.1.2 If determination of exhaust flow is performed, utilizing the NOx Technical Code, appendix 6 (Method 2, universal, carbon/oxygen-balance), then O2 and/or CO2 should be measured and provisions in appendix 6 that assume complete combustion may be used in all cases. If the provisions in appendix 6 that do not assume complete combustion are preferred, then additionally CO and HC should be measured.
 
1.1.3 The exhaust gases should be analysed with the following instruments. For non-linear analysers, the use of linearizing circuits is permitted. Other systems or analysers may be accepted, subject to the approval of the Administration, provided they yield equivalent results to that of the equipment referenced below:
 
.1 Oxides of nitrogen (NOx) analysis
 
 The oxides of nitrogen analyser should be of the Chemiluminescent Detector (CLD) or Heated Chemiluminescent Detector (HCLD) type. The exhaust gas sampled for NOx measurement should be maintained above its dewpoint temperature until it has passed through an NO2 to NO converter.
 
      Note: In the case of raw exhaust gas this temperature should be greater than 333 K (60℃) if the engine is fueled with ISO 8217 DM-grade type fuel and greater than 413 K (140℃) if fueled with ISO 8217 RM-grade type fuel.
 
.2 Carbon dioxide (CO2) analysis
 
 When needed, the carbon dioxide analyser should be of the Non-Dispersive Infrared (NDIR) absorption type.
 
.3 Oxygen (O2) analysis
 
 When needed, the oxygen analyser should be of the Paramagnetic Detector (PMD), Zirconium Dioxide (ZRDO) or Electrochemical Sensor (ECS) type:
 
.4 Carbon monoxide (CO) analysis
 
 When needed, the carbon monoxide analyser should be of the Non-Dispersive
Infrared (NDIR) absorption type.
 
.5 Hydrocarbon (HC) analysis
 
 When needed, the hydrocarbon analyser should be of the Heated Flame Ionization Detector (HFID) type. The exhaust gas sampled for HC measurement should be maintained at 463 K ± 10 K (190℃±10℃) from the sample point to the detector.
 
1.2 Analyser specifications
 
1.2.1 The analyser specifications should be consistent with the NOx Technical Code, appendix 3, paragraphs 1.4, 1.5, 1.6, 1.7, 1.8 and 1.9.
 
1.2.2 The analyser range should be such that the measured emission value is within 15%-100% of the range used.
 
1.2.3 The analysing equipment should be installed and maintained in accordance with manufacturer's recommendations such that the requirements of the NOx Technical Code, appendix 3 paragraphs 1.5, 1.6, 1.7, 1.8, 1.9 and appendix 4, paragraphs 7 and 8, are met.
 
1.3 Pure and calibration gases
 
1.3.1 Pure and calibration gases, as required, should comply with the NOx Technical Code, appendix 4, paragraphs 2. 1 and 2.2. Declared concentrations should be traceable to national and/or international standards. Calibration gases should be in accordance with the analysing equipment manufacturer's recommendations.
 
1.3.2 Analyser span gases should be between 80%-100% of the analyser scale being spanned.
 
Note: Under certain conditions, only a span gas for the NOx analyser could be necessary for calibration of the analytical instruments. A NO span gas for a NOx analyser can be applied as a zero gas for an O2 or CO2 analyser if that span gas is balanced only with nitrogen. Ambient air may be applied both as a span gas for an O2 analyser (i.e. 20.9% O2) and as a zero gas for a NOx analyser, provided that the ambient air is uncontaminated by exhaust gas.
 
1.4 Gas sampling and transfer system
 
1.4.1 The exhaust gas sample should be representative of the average exhaust emission from all the engine's cylinders. The gas sampling system should comply with the NOx Technical Code, paragraph 5.9.3.
 
1.4.2 The exhaust gas sample should be drawn from a zone anywhere between 10%-90% of the duct diameter.
 
1.4.3 In order to facilitate the installation of the sampling probe, an example of a sample point connection flange is given in appendix 1.
 
1.4.4 The exhaust gas sample for NOx measurement should be maintained so as to prevent NO2 loss via water or acid condensation in accordance with analysing equipment manufacturer's recommendations.
 
1.4.5 The gas sample should not be dried by chemical driers.
 
1.4.6 The gas sampling system should be capable of being verified to be free of ingress leakage in accordance with analysing equipment manufacturer's recommendations.
 
1.4.7 An additional sample point adjacent to that used should be provided to facilitate quality control checks on the system.







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