Functionality
2. PST Scheduler
1. Plant asset management features
2. PST Scheduler
3. PLUG-IN Applications and FieldMate
4. Best in Class Collaboration
It is known that partial stroke tests (PST) extends the interval period between full stroke tests (FST) for emergency shutdown valves and help to reduce maintenance costs.　PST Scheduler brings precision, efficiency, and integration to the PST process. PST Scheduler can schedule an automatic, semi-automatic, or manual PST and automatically record test results for safety valves connected either to a Yokogawa ProSafe-RS or another safety instrumented systems. PST Scheduler works with safety valves from the four leading vendors.
Brochure of PST Scheduler
PRM and PST Schedule
Operating under PRM, PST Scheduler remotely executes the PST provided by the safety valve vendor, and records the results. Testing is efficient and well planned and results are shown on a single screen without any additional hardware or software. Only Yokogawa's PRM and PST Scheduler support safety valves from multiple vendors.
Features of PST Scheduler
Schedule: Week, Month, Year, On demand
Mode: Manual, Semi-automatic, Automatic
Execution: Serial, Parallel
Operation: Execute, Pause, Resume, Skip
Recording: PST results
Maximize safety system performance
Yokogawa's ProSafe-RS safety instrumented system is SIL3 certified even in a single modular configuration. Execution of PSTs on a fixed schedule is key to ensuring that a safety system will function correctly in an emergency. The combination of ProSafe-RS and PRM with PST Scheduler not only simplifies the management of safety devices, it maximizes safety system performance. In addition, no additional wiring or hardware such as a multiplexer is needed to manage safety devices.
Optimal flexibility in valve selection
The Vigilant Integration Partners (VIP) program is an open, non-exclusive, standard-based, and interoperability-driven initiative that enables users of Yokogawa's ProSafe-RS Safety Instrumented System and PRM asset management system to use best-in-class field devices from Dresser Masoneilan, Flowserve Corporation, Metso, and SAMSON AG.
Find more about Interoperability: PST Scheduler Integration
A partial stroke test (PST) partially opens and closes emergency shutdown (ESD) valves while the plant is running. Safety standards, such as IEC61508, IEC61511, or ANSI/ISA-84.00.01, require full stroke tests (FST) for those ESD valves to be conducted at certain intervals depending on the safety integrity levels (SIL) to make certain that they are functional in case of emergency. FST requires those shutdown valves to fully open and close, and it can only be done while the plant is shut down for maintenance. However, by conducting PSTs, it is possible to extend the intervals of the FSTs, thus the plant operation time can be maximized, which means the OPEX and TCO are reduced.
