Partial Stroke Test (PST) for Emergency Shutdown (ESD) Valves
Final control elements in Emergency Shutdown (ESD) applications such as ON-OFF-, Blow Down and Venting-Valves remain in one position over a longer time without any mechanical movement. These valves can show the tendency to get stuck and as a result might not operate upon demand. This can have a severe impact on the functionality of a Safety System and could result in an adverse condition to the operating personnel, plant equipment and the environment. The Partial Stroke Test (PST) offers operators a tool to identify the troubleshooting function of ESD valves. The test can be easily executed via the DTM based configuration and diagnostic tool.
Key Benefits
- Intrinsically safe and explosion proof
- Inductive limit switches
- PST Activation (DI for command “do PST”):
- Manually on board (LCD + push buttons)
- Automatically
- Through a separate Binary Input for SIS Logic Solver
- LCP960 for local monitoring of PST
- Testing Status through communication, LCD and Binary Output
- Certified up to SIL3
- Configuration:
- Test Interval
- Setpoint Change
- Maximum Wait Time
- Minimum Pressure
- Predictive Maintenance by means of Break Pressure trend, Re-inflate trend
- PST signature
- Complete PST report for print out
- PST with Fail Open (full pressure in output) or with Fail Safe (depressurizing output)
- PST for single or double acting Actuator
- PST with HART / Profibus PA and FF H1
- Attachment kit for any valves
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