# 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, Appendix 1

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

Summary of approval process for natural gas and LPG fuelled engines including dual-fuel engines
Tables 1.1 to 1.3.show a summary of the approval process for of natural gas fuelled engines and LPG fuelled engines and of the minimum number of tests required for approval of dual-fuel engines.
Table 1.1
EU type-approval of natural gas fuelled engines
Point 2.3: Requirements for an universal fuel range engine
Number of test runs
Calculation of ‘r’
Point 2.4: Requirements for a restricted fuel range engine
Number of test runs
Calculation of ‘r’
Refer to point 2.3.1.
NG-engine adaptable to any fuel composition
GR (1) and G25 (2)
At manufacturer's request engine may be tested on an additional market fuel (3),
if Sl = 0,89 – 1,19
2
(max. 3)
r = fuel 2 G 25 fuel 1 G R and, if tested with an additional fuel;
r a = fuel 2 G 25 fuel 3 market fuel and
r b = fuel 1 G R fuel 3 G 23 or market fuel
Refer to point 2.3.2.
NG-engine which is self-adaptive by a switch
GR (1) and G23 (3) for H and
G25 (2) and G23 (3) for L
At manufacturer's request engine may be tested on a market fuel (3) instead of G23,
if Sl = 0,89 – 1,19
2 for the H-range, and
2 for the L-range;
at respective position of switch
r b = fuel 1 G R fuel 3 G 23 or market fuel and
r a = fuel 2 G 25 fuel 3 G 23 or market fuel
Refer to point 2.4.1.
NG-engine laid out for operation on either H-range gas or L-range gas
GR (1) and G23 (3) for H or
G25 (2) and G23 (3) for L
At manufacturer's request engine may be tested on a market fuel (3) instead of G23,
if Sl = 0,89 – 1,19
2 for the H-range
or
2 for the L-range
2
r b = fuel 1 G R fuel 3 G 23 or market fuel for the H-range
or
r a = fuel 2 G 25 fuel 3 G 23 or market fuel for the L-range
Refer to point 2.4.2.
NG-engine laid out for operation on one specific fuel composition
GR (1) and G25 (2),
Fine-tuning between the tests allowed.
At manufacturer's request engine may be tested on:
GR (1) and G23 (3) for H or
G25 (2) and G23 (3) for L
2
2 for the H-range
or
2 for the L-range
Table 1.2
EU type-approval of LPG fuelled engines
Point 2.3: Requirements for an universal fuel range engine
Number of test runs
Calculation of ‘r’
Point 2.4: Requirements for a restricted fuel range engine
Number of test runs
Calculation of ‘r’
Refer to point 2.3.4.LPG-engine adaptable to any fuel composition
Fuel A and fuel B
2
r = fuel B fuel A
Refer to point 2.4.2.LPG-engine laid out for operation on one specific fuel composition
Fuel A and fuel B, fine-tuning between the tests allowed
2
Table 1.3
Minimum number of tests required for EU type-approval of dual-fuel engines
Dual-fuel type
Liquid-fuel mode
Dual-fuel mode
CNG
LNG
LNG20
LPG
1A
Universal or restricted
(2 tests)
Universal
(2 tests)
Fuel-specific
(1 test)
Universal or restricted
(2 tests)
1B
Universal
(1 test)
Universal or restricted
(2 tests)
Universal
(2 tests)
Fuel-specific
(1 test)
Universal or restricted
(2 tests)
2A
Universal or restricted
(2 tests)
Universal
(2 tests)
Fuel-specific
(1 test)
Universal or restricted
(2 tests)
2B
Universal
(1 test)
Universal or restricted
(2 tests)
Universal
(2 tests)
Fuel-specific
(1 test)
Universal or restricted
(2 tests)
3B
Universal
(1 test)
Universal or restricted
(2 tests)
Universal
(2 tests)
Fuel-specific
(1 test)
Universal or restricted
(2 tests)

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/I/appendix/1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-I/appendix-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.