Valve Leakage Analysis in Reciprocating Compressor by Using Acoustic Emission Technique

Abstract

Non-intrusive measurement technique, namely, the acoustic emission (AE) technique, is often employed to provide an early detection of valve failures in reciprocating compressor. Past researchers often relate the root-mean-square (RMS) value of AE signal to valve leakages. However, the amount of valve leakage is often unknown. In other words, the degree of valve deterioration to the extent that valve should be replaced is unknown. This study examined the effect of increasing valve impacts on AE signal and flow rate of fluid flowing through the suction valve correspondingly, with the intention to relate AE signal to the mass flow rate of fluid. It involves measurement of both suction mass flow rate and AE signal at different compressor speeds and valve conditions and statistical test to investigate the significance of compressor speed on AE signal and mass flow rate of suction valve. It is believed that the study can help to establish an empirical relationship for AE signal and valve leakage rate, which is helpful in estimating the reduction of compressor performance due to valve leakages.