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# Natural Gas Requirement for a gas engine

## Natural Gas Requirement for a gas engine

(OP)
Gas engine (driver to a compressor) is to be converted from high BTU gas to low BTU gas. Based on available data I have calculated the amount of gas required. Am I on right track? Appreciate your input and comments.

Available Data:

Rated bhp @ 900 rpm        =    748    =  558 kWb
Gas Heat Heating Value (existing)  =  1040 BTU/ft3
Gas Heat Heating Value (new)  =  883 BTU/ft3

Conversion Factor  =  42.43 BTU/min per hp (Camron Hydraulic Data book)
Gas Engine efficiency  = 35%    (assumed)

Calculations:

Ratio of Heating Values    =  1040 / 883    =  1.178
Amount of Gas Required    =   748 / 0.35    =    2137 hp
=  2137 x  42.43  =   90,679 BTU/min
=  90,679 / 1040   =   87.2  ft3/min
=  125,555  ft3/day

New Gas Requirement   =    125,555 x 1.178 = 147,890  ft3/day
Replies continue below

### RE: Natural Gas Requirement for a gas engine

Considering overall efficiency(thermal and mechanical) as 35%, you are right with your calculation. You can straight away consider 90679/883 instead of 90679/1040 and multiplying it with1.178 (hehe... I simplified your calculation)

(OP)
Thanks quark

### RE: Natural Gas Requirement for a gas engine

The engine may need to be retuned and the engine management system reprogrammed if a different composition gas is used.

I would check with the engine manufacturer.

### RE: Natural Gas Requirement for a gas engine

(OP)
tickle,
I intend to do that, after finishing my homework. Thanks for the tip.

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