Many of the Usual Guidelines Apply in Coal Seam Gas Application for Centrifugal Compressors, but This Application Presents Additional Conditions That Should be Considered. For coal seam gas (CSG) compression, centrifugal compressors have been applied in an approximate range of 211,900 cfh to 10.6 MMcfh (6000 to 300,000 m~3/hr). Above 10.6 MMcfh (300,000 m~3/hr), CSG compressor trains are not applicable, however, if any are required, axial compressors may be used. Below 211,900 cfh (6000 m~3/hr) oil-flooded screw compressors are more efficient and cheaper. Full allowance is needed for the untreated and water-saturated nature of the CSG, which may contain coal fines and corrosive agents. A CSG centrifugal compressor train design and arrangement is often complex, and optimization must be made between the various process requirements. These include mechanical needs, aerodynamic limits, reliability issues and commercial situations of centrifugal compressor and gas turbine driver.
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