Annex - Amendments to the NOx Technical Code 2008 (Testing of gas-fuelled and dual fuel engines)
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Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.272(69) Amendments to the NOx Technical Code 2008 Nitrogen Oxides From Marine Diesel Engines (Testing of gas-fuelled and dual fuel engines) (Adopted on 22 April 2016) - Annex - Amendments to the NOx Technical Code 2008 (Testing of gas-fuelled and dual fuel engines)

Annex - Amendments to the NOx Technical Code 2008 (Testing of gas-fuelled and dual fuel engines)

 This document has been consolidated into NOX Technical Code 2008

Abbreviations, subscripts and symbols

1 In subparagraphs .1 and .2 and in the title of table 2, the word "marine" is added before the word "diesel".

2 In table 2, row 4 is replaced with the following:

"      
  (H)FID (Heated) flame ionization detector  
      "

Chapter 1 General

3 In paragraph 1.3.10, the following new sentence is inserted after the first sentence:

  • "In addition, a gas-fuelled engine installed on a ship constructed on or after 1 March 2016 or a gas-fuelled additional or non-identical replacement engine installed on or after that date is also considered as a marine diesel engine."

Chapter 4 Approval for serially manufactured engines: engine family and engine group concepts

4 In paragraph 4.3.8.2.6, after the existing bullet point " dual fuel", a new bullet point is added as follows:

  • " gas fuel"

5 After existing paragraph 4.3.8.2.10, a new paragraph 4.3.8.2.11 is added as follows:

  • ".11 ignition methods:

    • - compression ignition

    • - ignition by pilot injection

    • - ignition by spark plug or other external ignition device"

6 In paragraph 4.4.6.2.5, after the words "injection cam", the words "or gas valve" are inserted.

7 In the first and second bullet points under paragraph 4.4.7.2.1, after the word "injection", the words "or ignition" are inserted, respectively.

8 In paragraph 4.4.7.2.2, after the existing bullet point " combustion chamber", a new bullet point is added as follows:

  • " gas valve specification."

Chapter 5 Procedures for NOX emission measurements on a test bed

9 In paragraph 5.2.1.2, after the word "engines", the words "operating on liquid or dual fuel" are inserted.

10 The existing paragraph 5.2.1.3 is renumbered as 5.2.1.3.1 and in the renumbered paragraph 5.2.1.3.1, after the word "engines", the words "operating on liquid or dual fuel" are inserted.

11 A new paragraph 5.2.1.3.2 is added after the renumbered paragraph 5.2.1.3.1 as follows:

  • "5.2.1.3.2 For engines to be tested with gas fuel only with or without cooling of the intake air the parameter fa shall be determined according to the following:

  • (2a) "

12 In the second sentence of paragraph 5.3.3, the words "fuel injection pump" are replaced with the word "engine".

13 In the first sentence of paragraph 5.3.4, the words "for dual fuel" are deleted.

14 In the second sentence of paragraph 5.4.2, before the word "diesel", the word "marine" is inserted.

15 A new paragraph 5.12.3.2.3 is added as follows:

  • ".3 The calculation shall be in accordance with paragraphs 5.12.3.1 to 5.12.3.2. However, qmf, WALF, WBET, WDEL, WEPS values shall be calculated in accordance with the following table:

  • Factors in the formula (6) (7) (8) = Formula for factors
    qmf = qmf_G + qmf_L
    WALF =
    WBET =
    WDEL =
    WEPS =

16 Paragraph 5.12.3.3 is replaced with the following:

  • "5.12.3.3 For the intake air:

  • kwa = 1 - kw2 (15) "

17 Paragraph 5.12.4.1 is replaced with the following:

  • "5.12.4.1 As the NOX emission depends on ambient air conditions, the NOX concentration shall be corrected for ambient air temperature and humidity with the factors in accordance with 5.12.4.5, 5.12.4.6 or 5.12.4.7 as applicable."

18 In paragraph 5.12.4.6, the last sentence is replaced with the following:

  • "However if HaHSC, then HSC shall be used in place of Ha in formula (17) or (17a)."

19 A new paragraph 5.12.4.7 is added after existing paragraph 5.12.4.6 as follows:

  • "5.12.4.7 For engines to be tested with gas fuel only:

  • khd = 0.6272 + 44.030 10-3Ha − 0.862 10-3 Ha2   (17a)
  • where:

  • Ha is the humidity of the intake air at the inlet to the air filter in g water per kg dry air."

Chapter 6 Procedures for demonstrating compliance with NOX emission limits on board

20 In the first sentence of paragraph 6.2.1.2, before the word "diesel", the word "marine" is inserted.

21 Subparagraph 6.2.2.3.1 is replaced with the following:

  • ".1 injection or ignition timing,"

22 In subparagraph 6.2.2.3.14, the word "or" is deleted.

23 At the end of subparagraph 6.2.2.3.15, the word "or" is added.

24 A new subparagraph 6.2.2.3.16 is added as follows:

  • ".16 gas valve."

25 In the third sentence of paragraph 6.3.1.4, the word "dual" is replaced with the word "gas".

26 The footnote of table 6 is replaced with the following:

  • "* Only for engines to be tested with gas fuel."

27 Paragraph 6.3.4.1 is replaced with the following:

  • "6.3.4.1 Generally all emission measurements with liquid fuel shall be carried out with the engine running on marine diesel fuel oil of an ISO 8217:2005, DM grade. Generally all emission measurements with gas fuel shall be carried out with the engine running on gas fuel equivalent to ISO 8178-5:2008."

28 In paragraph 6.3.4.3, before the word "engine", the words "or gas-fuelled" are inserted.

Appendix III Specifications for analysers to be used in the determination of gaseous components of marine diesel engine emissions

29 Subparagraph 1.2.12 is replaced with the following:

  • ".12 O2 Oxygen analyser

    • Paramagnetic detector (PMD), zirconium dioxide (ZRDO) or electrochemical sensor (ECS). ZRDO shall not be used for dual fuel or gas-fuelled engines."

30 At the end of paragraph 3.3, a new sentence is added as follows:

  • "Optionally, for gas-fuelled engines (without liquid pilot injection), the hydrocarbon analyser may be of the non-heated flame ionization detector (FID) type."

31 At the end of paragraph 3.5, a new sentence is added as follows:

  • "ZRDO shall not be used for dual fuel or gas-fuelled engines."

Appendix IV Calibration of the analytical and measurement instruments

32 In paragraph 2.2.4, the word "bleeding" is replaced with the word "blending".

33 In paragraphs 5.3, 5.4.2, 8, 8.1.1, 8.2.2 and 8.3.2.10, the symbol "FID" is replaced with the symbol "(H)FID", respectively.

Appendix V Parent engine test report and test data

Section 1 Parent engine test report

34 Rows 10, 11 and 12 of sheet 1/5 are replaced with the following:

"        
  Static injection or ignition timing deg CA BTDC  
  Electronic injection or ignition control No: Yes:  
  Variable injection or ignition control No: Yes:  
        "

35 Rows 6 and 27 of sheet 2/5 are replaced, respectively, as follows:

  • Row 6:

  • "      
      Fuel type to be used on board Distillate/distillate or heavy fuel/dual fuel/ gas fuel  
          "
  • Row 27:

  • "              
      Injection or ignition timing (range)            
                  "

36 A new row is inserted after row 6 of sheet 2/5 as follows:

"      
  Ignition methods Compression ignition/ignition by pilot injection/ignition by spark plug or other external ignition device  
      "

37 The title of the table "Fuel characteristics" under sheet 3/5 is replaced with the following:

  • "Liquid fuel characteristics"

38 A new table is added after the table of fuel characteristics under sheet 3/5 as follows:

"Gas fuel characteristics
Fuel type:    
Fuel properties Fuel elemental analysis
Methane number EN16726: 2015   Carbon % m/m
Lower heating value   MJ/kg Hydrogen % m/m
Boiling point   C Nitrogen % m/m
Density at boiling point   kg/m3 Oxygen % m/m
Pressure at boiling point   bar (abs) Sulphur % m/m
      Methane, CH4 mol%
      Ethane, C2H6 mol%
      Propane, C3H8 mol%
      Isobutane,

i C4H10

mol%
      N-Butane,

n C4H10

mol%
      Pentane, C5H12 mol%
      C6+ mol%
      CO2 mol%

39 Row 11 of sheet 5/5 is replaced and a footnote is added as follows:

"                          
  Fuel rack/gas admission duration** mm/sec                      
  ** Only for engines to be tested with gas fuel"

Section 2 Parent engine test data to be included in the technical file

40 In the second table, currently entitled "Parent engine test fuel oil", the title is replaced by:

  • "Parent engine test liquid fuel"

  • The following table is inserted after the aforementioned table:

  • "    
      Parent engine test gas fuel  
      ISO 8178-5:2008  
      Carbon % m/m    
      Hydrogen % m/m    
      Sulphur % m/m    
      Nitrogen % m/m    
      Oxygen % m/m    
      Methane, CH4 mol%    
      Ethane, C2H6 mol%    
      Propane, C3H8 mol%    
      Isobutane, i C4H10 mol%    
      N-Butane, n C4H10 mol%    
      Pentane, C5H12 mol%    
      C6+ mol%    
      CO2 mol%    
            "

Appendix VI Calculation of exhaust gas mass flow (carbon balance method)

41 In paragraph 2.5, the words "in case of gas mode operation of dual-fuel engine," are deleted.

Appendix VII Checklist for an engine parameter check method

42 The chapeau of paragraph 1.1 is replaced with the following:

  • ".1 parameter 'injection timing and ignition timing': "

43 At the end of subparagraph 1.1.4, the word "and" is added.

44 A new subparagraph 1.1.5 is added as follows:

  • ".5 timing indicator or timing light."

Appendix VIII Implementation of the direct measurement and monitoring method

45 At the end of paragraph 2.1.1.4, a new sentence is added as follows:

  • "Optionally, for gas-fuelled engines (without liquid pilot injection), the hydrocarbon analyser may be of the non-heated flame ionization detector (FID) type."

46 At the end of paragraph 2.1.1.5, a new sentence is added as follows:

  • "ZRDO shall not be used for dual fuel or gas-fuelled engines."


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