Page 640 - The Central Motor Vehicles Rules, 1989

612 THE CENTRAL MOTOR VEHICLE RULES, 1989 ANNEXURE IV M

7. Expansion ratio m3(n)/m3 liq 558-600.0
8. Gas GCV MJ/m3(n) 39.91-46.24
9. Wobbe Index MJ/m3(n) 53.51-56.77]

ANNEXURE IV-M
[Refer Rule 115(15)] ANNEXURE IV M
SPECIFICATION OF REFERENCE FUEL FOR LPG
LPG Reference Fuel for Category M and Category N vehicles not exceeding 3,500 kgs
GVW and two and three-wheelers
Parameter Unit Fuel A Fuel B Test method
Composition : ISO 7941
C3-content % vol. 30+2 85+2

C4-content % vol. balance balance
<C3, >C4 % vol. maximum 2 maximum 2
Olefins % vol. maximum 12 maximum 15
Evaporation residue mg/kg maximum 50 maximum 50 ISO 13757
Water at 0˚C free free Visual inspection
Total sulphur content mg/kg maximum 10 maximum 10 EN 24260
Hydrogen sulphide none none ISO 8819

Copper strip corrosion Rating Class 1 Class 1 ISO 6251 (1)
Odour Characteristic Characteristic
Motor octane number minimum 89 minimum 89 EN 589 Annex B
(1)
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.

LPG Reference Fuel for vehicles above 3,500 kgs GVW
Parameter Unit Fuel A Fuel B Test method

Composition : ISO 7941
C3-content % vol. 50+2 85+2
C4-content % vol. balance balance
<C3, >C4 % vol. maximum 2 maximum 2
Olefins % vol. maximum 12 maximum 14
Evaporation residue mg/kg maximum 50 maximum 50 ISO 13757

Water at 0˚C free free Visual inspection