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Appendix 1

United Kingdom

Original text. Later amendments are not shown.

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 engineNumber of test runsCalculation of ‘r’Point 2.4: Requirements for a restricted fuel range engineNumber of test runsCalculation 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 engineNumber of test runsCalculation of ‘r’Point 2.4: Requirements for a restricted fuel range engineNumber of test runsCalculation of ‘r’
Refer to point 2.3.4.LPG-engine adaptable to any fuel compositionFuel A and fuel B2 r = fuel B fuel A
Refer to point 2.4.2.LPG-engine laid out for operation on one specific fuel compositionFuel A and fuel B, fine-tuning between the tests allowed2

Table 1.3

Minimum number of tests required for EU type-approval of dual-fuel engines

Dual-fuel typeLiquid-fuel modeDual-fuel mode
CNGLNGLNG20 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)