Partial stroke testing of ESD valves is a mandatory IEC 61511 requirement for SIL-rated safety loops. This article covers the complete PST procedure for Invensys Foxboro FBM242 DO cards driving smart solenoid valves, integrated with GE Mark VIe PSTSEQ safety logic. Topics include stroke travel limits, timing parameters, diagnostic coverage improvement, PFDavg recalculation, and audit documentation. Practical fault patterns with resolution steps are included.
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