Abstract: In order to diagnose the deviation of interstage pressure of reciprocating compressor, this paper selected a representative example and carried out coupling analysis of the effects of process parameters, leakage faults and flow regulation on the interstage pressure of reciprocating compressors through theoretical calculation. It explored the variation law of interstage pressure of reciprocating compressor under the simultaneous action of various factors. The analysis results indicate that the results and rules caused by various factors of different degrees acting on different cylinders are relatively complex, there may be greater deviation of interstage pressures due to synclastic superposition effect or interstage pressures being more consistent with the normal value resulting from reverse superposition effect. The study can provide certain theoretical basis for the analysis of interstage pressure variation of reciprocating compressor.

Key words: reciprocating compressor, interstage pressure, multi-factor, superposition effect, coupling analysis