A lot of us are required to do preliminary utility estimation calculations during the Feasibility / Concept stage of a project. Another terminology often used is the Pre-FEED stage of a project. In fact this is often where non-availability of data or insufficient data becomes a bottle-neck. In such cases some minimum data with certain empirical calculation methods help to arrive at figures which may be used to for high end (+/- 30%) cost estimation of a project and help establish its feasibility.
Today’s blog entry as the subject line says, is with regards to compressor stations, for transport of natural gas through long-distance pipelines. An approximation for fuel consumption can be done using certain empirical formulas. The formula is presented herewith:
F = (14 / NHV)*(Pturbine + Pauxiliary)
F = Fuel Gas consumption of the compressor and the auxiliary systems associated with the compressor, Sm3/h
NHV = “Net heating Value” of the Fuel Gas to be used, MJ/Sm3 (eg: Natural Gas ~ 41 MJ/Sm3 with a certain composition)
Pturbine = Turbine power requirement, kW
Pauxiliary = Power consumption in kW of auxiliaries associated with the compressor package, which includes electricity, lubricating oil system, cooling system etc.. This has a strong dependency on local climatic conditions and on the extent of gas sourced power used for such auxiliaries.
Note: Sm3 refers to standard cubic meter at standard conditions of temperature (15 deg C ) and pressure (101.325 kPa (abs))