PDF《CCS 技术通告》

1 March

2016 and also such engines installed as additional or non-identical replacement engines on or after that date. PPR

2 considered further amendments to the NOX Technical Code

2008 relating to the certification of gas-fuelled engines which were subsequently approved by MEPC 68. As such, these steps may be seen as complementary to the International Code of Safety for Ships using Gases or other Low- flashpoint Fuels (IGF Code), adopted by MSC

95 in June

2015 (resolution MSC.391(95)).

3 Therefore, the procedures for the certification of engines which use gas as a fuel, typically natural gas, but also other gases, have now been finalized.

4 Gas-fuelled engines, where ignition is initiated by a spark plug or another external ignition device, are generally expected to readily meet the Tier III NOX emission limits and therefore it is possible that engine builders will seek only Tier III certification for such engines, irrespective of whether they are to be installed on ships which operate outside or inside Emission Control Areas (ECA) for NOX as described in regulation 13.6 of MARPOL Annex VI, currently the North American ECA and the United States Caribbean Sea ECA, both of which will take effect from

1 January 2016.

5 In the case of dual fuel engines, those engines which use gas fuel in a pre-mix combustion process with the liquid fuel as the pilot ignition source (as opposed to gas-diesel engines which use high pressure gas injection directly into the combustion chamber) are expected to be certified to the Tier III NOX standards when operating in that arrangement. Consequently, the Technical Files for such engines will include the restriction that, when operating in the Tier III condition, the liquid fuel rate will be limited to the certified maximum liquid pilot fuel rate and those engines will undergo their Tier III Parent Engine test on that basis.1 These engines are expected to be certified to the Tier II NOX standards when operating on liquid fuel oil only. In these cases, the EIAPP Certificate would be completed for both Tier II (liquid fuel only) and Tier III (gas fuel with pilot fuel), with a single Technical File giving two different modes of operation.

6 In terms of the applied Onboard NOX Verification Procedure, virtually all engines use the Parameter Check Method. In this, the Technical Files will provide that all replacements and adjustments to the listed components and settings which affect NOX emissions are to be recorded in a Record Book of Engine Parameters. This is also the case for engines certified to both Tier II and Tier III, with replacements and adjustments for both operating conditions being listed. In addition, amendments to regulation

13 of MARPOL Annex VI approved at MEPC

68 also require that the tier and on/off status of an engine certified to both Tier II and Tier III or only Tier II on ships subject to regulation 13.5.1 of MARPOL Annex VI should be recorded

1 The sulphur limit of the fuel used in these engines, in Tier II and Tier III configuration, is subject to MARPOL Annex VI regulation

14 requirements regardless. MEPC.1/Circ.854 Annex, page

2 I:\CIRC\MEPC\01\MEPC.1-Circ.854 (E).docx together with the date, time and ship'

s position at entry into and exit from an ECA under regulation 13.6 of MARPOL Annex VI or when the on/off status changes within such designated area. It should be noted that prior to entry into an ECA, sufficient time must be allowed for the tier changeover, to ensure Tier III compliance upon entry into t........