Shutdown Reduction Methods and Monitoring System Optimization for Compressors in Condensate Stabilization Units

In this paper, the procedure of determination, analysis and rectification of repeatable trips causes of off-gas compressors located in condensate stabilization unit of South Pars Gas Complex 2nd refinery, that have instrumentation and control system sources, are presented. Besides decreasing of production rate and increasing acid gas flaring, each trip results serious and inevitable damages on environment, human health, equipments and their accessories in consequent. Significant reduction in number of trips has been achieved by finding proper solutions for all mentioned problems and applying needed modifications that could be listed as changes in temperature transmitter settings, upgrading Human Machine Interface, addition of new signals to PLC software to be shown in monitoring system and DCS for enhanced trip analysis and also correction of some control system program parts such as determination of First out alarm. The PLC controller of this unit is MODICON of Schneider family, quantum series and programming software is concept and also the monitoring system software for this unit is complicity.