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CNG FUELLING STATIONS DESIGN PHILOSPHY
Presented By:
Eng. Hisham Radwan
Natural Gas Vehicles Company
I. OVERVIEW
(a) Compressed Natural Gas – CNG:-
Natural Gas, as an alternative fuel for vehicles, is supplied from the
Natural Gas Distribution Network to the CNG fuelling stations to be
compressed to 250 bars. It is then dispensed, to be stored on board of the
vehicle at about 200 bars in a cylinder installed in the rear, under carriage, or
on top of the vehicle.
When the Natural Gas is required by the engine, it leaves the cylinder
traveling through a high pressure pipe to a high pressure regulator, where the
pressure is reduced close to atmospheric pressure, through a specially
designed mixer, where it is properly mixed with air. The mixture then flows
into the engine’s combustion chamber, and is ignited to create the power
required to drive the vehicle.
(b) CNG Fuelling Stations General Description:-
o Gas Supply and Metering
The incoming gas supply and metering installation primarily depend
on the pressure and flow demands of the gas compressor.
o Natural Gas Compressor
In general, gas compressors for natural gas filling stations have
relatively low flow rates, but they produce high pressure lifts “typical

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CNG Fueling Stations Design Philosophy