C3-content per cent v/v 30 ± 2 85 ± 2 C4-content per cent v/v Balance1 Balance1 < C3 , > C4 per cent v/v Maximum 2 Maximum 2 Olefins per cent v/v Maximum 12 Maximum 15 Evaporation mg/kg Maximum 50 Maximum 50 EN 15470 residue Water at 0 °C Free Free EN 15469 EN 24260, Total sulphur ASTM D content including mg/kg Maximum 10 Maximum 10 3246, odorant ASTM 6667 Hydrogen EN ISO None None sulphide 8819 Copper strip corrosion Rating Class 1 Class 1 ISO 62512 (1h at 40 °C) Odour Motor octane Minimum Minimum EN 589 number3 89.0 89.0 Annex B Notes: 1 Balance shall be read as follows: balance = 100 - C3 - <C3 - >C4. 2 This method may not accurately determine the presence of corrosive materials if the sample contains corrosion inhibitors or other chemicals which diminish the corrosivity of the sample to the copper strip. Therefore, the addition of such compounds for the sole purpose of biasing the test method is prohibited. 3 At the request of the engine manufacturer, a higher MON could be used to perform the type approval tests. 3.2. Type: Natural Gas/ Biomethane 3.2.1. Specification for reference fuels supplied with fixed properties (eg from a sealed container) As an alternative to the reference fuels set out in this paragraph, the equivalent fuels in paragraph 3.2.2. of this Annex may be used Limits Units Basis Test method minimum maximum Reference fuel GR Composition: Methane 87 84 89 Ethane 13 11 15 per cent Balance1 1 ISO 6974 — — mole
C3-content per cent v/v 30 ± 2 85 ± 2 C4-content per cent v/v Balance1 Balance1 < C3 , > C4 per cent v/v Maximum 2 Maximum 2 Olefins per cent v/v Maximum 12 Maximum 15 Evaporation residue mg/kg Maximum 50 Maximum 50 EN 15470 Water at 0 °C Free Free EN 15469 Total sulphur content including odorant mg/kg Maximum 10 Maximum 10 EN 24260, ASTM D 3246, ASTM 6667 Hydrogen sulphide None None EN ISO 8819 Copper strip corrosion (1h at 40 °C) Rating Class 1 Class 1 ISO 62512 Odour Motor octane number3 Minimum 89.0 Minimum 89.0 EN 589 Annex B Notes: 1 Balance shall be read as follows: balance = 100 - C3 - <C3 - >C4. 2 This method may not accurately determine the presence of corrosive materials if the sample contains corrosion inhibitors or other chemicals which diminish the corrosivity of the sample to the copper strip. Therefore, the addition of such compounds for the sole purpose of biasing the test method is prohibited. 3 At the request of the engine manufacturer, a higher MON could be used to perform the type approval tests. 3.2. Type: Natural Gas/ Biomethane 3.2.1. Specification for reference fuels supplied with fixed properties (eg from a sealed container) As an alternative to the reference fuels set out in this paragraph, the equivalent fuels in paragraph 3.2.2. of this Annex may be used Units Basis Limits Test method minimum maximum Reference fuel GR Composition: Methane 87 84 89 Ethane 13 11 15 Balance1 per cent mole — — 1 ISO 6974
GRPE-76-14e.docx