Interstage circuits

Low-pressure stage casings and interstage circuits on both centrifugal and positive displacement multi-stage compressors are not normally designed for full discharge pressure and must also be provided with overpressure protection. 

Standard load Refers to the resistance of a load that is a standard estabhshed by an organization or committee commissioned to decide standards. Input, output, and interstage resistance in RF circuits is estabhshed to be 50 unbalanced. Input, output, and interestage resistance in video circuits is estabhshed to be 75 Si unbalanced, and that for audio circuits is 300 S2 balanced and sometimes 600 S2 balanced or 8 Si unbalanced. 

In order to examine the hydrocarbon contaminant problem in an air separation plant, we may refer to Figure 1, Some contaminants in the entering air will be removed in the prepurification system, in the compressor interstage separators, in the caustic scrubber or other carbon dioxide removal system, in the adsorptive driers, and in the heat exchanger circuit, or in the regenerators of a low-pressure cycle. Those contaminants which pass these points will enter the high-pressure column where they will be washed into the enriched air stream and pass to the hydrocarbon adsorbers. The adsorbers will have substantial capacity for all hydrocarbons except methane. Most of the methane and traces of other hydrocarbons will pass on to the low-pressure column. They will be scrubbed down the column to the reboiler-condenser and, in a cycle as pictured, be continuously removed with the product oxygen. 

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