General Considerations

Gas temperature greatly affects compressor power requirement, regardless of compressor type. As a general rule, suction temperature should be as low as possible for each stage. Keeping coolers internally clean and optimizing cooling water flow to these critical exchangers therefore saves energy.

Similarly, incorrect use of suction strainers-often left in place after pre - commissioning - results in higher than necessary pressure ratio and increased energy consumption. Generally, suction strainers are not required since suction catchpots with demisters (and properly designed holding-down grids) prevent foreign object damage.

One area often overlooked is to minimize the required compressor pressure ratio. A single gage survey through the process equipment upstream and downstream of the compressor can highlight excessive pressure drop. Calculating the energy cost may justify de-bottlenecking-for example, lower pressure drop heat exchangers, increased line size etc.

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