Compressed Natural Gas (CNG)

Lucky Nurafiatin

The Pakistani government allows the use of compressed natural gas (CNG) as a transportation fuel to help reduce severe air pollution caused by diesel vehicles in the country.

A specification for CNG as automotive fuel is not available. However, the Oil & Gas Regulatory Authority (OGRA) published a natural gas quality standard in June 2018 (see table below).

Natural gas composition

Components	Limits
Sulfur, maximum	3.5 grains/100 scf[1] (0.015 ppm)
Hydrogen sulfide, maximum	0.24 grains/100 scf (0.001 ppm)
Carbon dioxide, maximum	3 mol%
Nitrogen, maximum	7 mol%
Calorific value, minimum	900 Btu [2]/scf
Wobbe index, minimum	1180 [3]
Water content, maximum	7 lbs/mmscf (147 ppm)

Note:

[1] scf: standard cubic feet

[2] Btu: British thermal unit

[3] +/- 5% variation on account of specifi

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