# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Division 3.2.1: Specification for reference fuels supplied with fixed properties (e.g. from a sealed container)

Extent: E+W+S+N.I.

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
Balance
% mole
—
—
1
ISO 6974
N2
% mole
ISO 6974
Sulphur content
mg/m3
—
—
10
ISO 6326-5
Wobbe Index (net)
MJ/m3
48,2
47,2
49,2

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/IX/division/3/division/3.2/division/3.2.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-IX/division-3/division-3.2/division-3.2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.