A Diagnostic System for Reciprocating Compressors
نویسندگان
چکیده
An advanced warning system for maintenance and control of reciprocating compressors is discussed. The compressor is instrumented to measure valve temperatures, interstage pressures and temperatures, rod drops, packing temperature and leakage flow, and numerous other variables. Under control of a microcomputer, a scanner monitors the sensors and updates a database. After a scan, an expert program evaluates the measurements, performs calculations, and checks truth tables to isolate potential problems. Other system features then allow the operator to generate reports, history plots, P-V diagrams, and frameload plots in order to gain further insight and decide on the urgency of a problem. Unscheduled shutdowns can therefore be prevented. INTRODUCTION Most rotating equipment is instrumented to provide vibration data for signature analysis. This approach has successfully prevented catastrophic failures. For reciprocating compressors vibration data by itself is insufficient to make a proper diagnosis. Additional information about pressures and temperatures is needed to correlate data and identify problems. Hence, a diagnostic system for a reciprocating compressor may easily include a large number of sensors interfaced to a remote microcomputer. A typical system implemented in a refinery is shown in Figure 1. It consists of: • Machine mounted sensors.
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