Division 3.2.1 Specification for reference fuels supplied with fixed properties (e.g. from a sealed container)
United Kingdom
As an alternative to the reference fuels set out in this point, the equivalent fuels in point 3.2.2 may be used
| Inerts (different from N2) + C2 + C2+. | |||||
| Value to be determined at 293,2 K (20 °C) and 101,3 kPa. | |||||
| Value to be determined at 273,2 K (0 °C) and 101,3 kPa. | |||||
| Characteristics | Units | Basis | Limits | Test method | |
|---|---|---|---|---|---|
| minimum | maximum | ||||
| Reference fuel GR | |||||
| Composition: | |||||
| Methane | 87 | 84 | 89 | ||
| Ethane | 13 | 11 | 15 | ||
| Balance (1) | % mole | — | — | 1 | ISO 6974 |
| Sulphur content | mg/m3 (2) | — | 10 | ISO 6326-5 | |
| Notes: (1) Inerts + C2+ (2) Value to be determined at standard conditions 293,2 K (20 °C) and 101,3 kPa. | |||||
| Reference fuel G23 | |||||
| Composition: | |||||
| Methane | 92,5 | 91,5 | 93,5 | ||
| Balance (1) | % mole | — | — | 1 | ISO 6974 |
| N2 | % mole | 7,5 | 6,5 | 8,5 | |
| Sulphur content | mg/m3 (2) | — | — | 10 | ISO 6326-5 |
| Notes: (1) Inerts (different from N2) + C2+ C2+ (2) Value to be determined at 293,2 K (20 °C) and 101,3 kPa. | |||||
| Reference fuel G25 | |||||
| Composition: | |||||
| Methane | % mole | 86 | 84 | 88 | |
| Balance (1) | % mole | — | — | 1 | ISO 6974 |
| N2 | % mole | 14 | 12 | 16 | |
| Sulphur content | mg/m3 (2) | — | — | 10 | ISO 6326-5 |
| Notes: (1) Inerts (different from N2) + C2+ C2+ (2) Value to be determined at 293,2 K (20 °C) and 101,3 kPa. | |||||
| Reference fuel G20 | |||||
| Composition: | |||||
| Methane | % mole | 100 | 99 | 100 | ISO 6974 |
| Balancef1 | % mole | — | — | 1 | ISO 6974 |
| N2 | % mole | ISO 6974 | |||
| Sulphur content | mg/m3 f2 | — | — | 10 | ISO 6326-5 |
| Wobbe Index (net) | MJ/m3 f3 | 48,2 | 47,2 | 49,2 | |
Annotations
Footnotes
- f1
-
Inerts (different from N2) + C2 + C2+.
- f2
-
Value to be determined at 293,2 K (20 °C) and 101,3 kPa.
- f3
-
Value to be determined at 273,2 K (0 °C) and 101,3 kPa.