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Yokogawa has claimed that its PST Scheduler software for Plant Resource Manager (PRM) is the first ever multi-vendor emergency shutdown (ESD) valve partial stroke test (PST) solution.

PST Scheduler was developed through the Vigilant Integration Partners (VIP) initiative by Yokogawa and four valve suppliers: Dresser-Masoneilan, Flowserve, Metso, and Samson.

Interoperability with the ESD valves manufactured by these companies is assured.

PST is a key technique for verifying the correct operation of ESD valves.

As an ESD valve normally remains fully open, there is concern that a build-up of foreign substances may cause the valve to stick or inhibit the drive mechanism, and that the valve will not function correctly in an emergency situation.

By slightly closing an ESD valve, the PST can diagnose such problems without disrupting the process.

This allows longer intervals between full stroke tests (which require a plant to be shut down), thereby reducing plant downtime.

PST Scheduler is used together with PRM to collectively manage and perform PSTs to determine whether ESD valves are in good working order and can respond properly when needed.

PRM can be connected with Yokogawa’s Prosafe-RS safety instrumented system to provide an integrated plant safety solution.

This solution makes it easier to schedule and conduct a PST, thereby contributing to plant safety and efficiency.

New product features include efficient PST scheduling and implementation.

With PST Scheduler, it is possible to schedule the automatic or semi-automatic implementation of a PST.

The test date can be easily revised.

PSTs can also be performed manually, if the need arises.

Another feature is collective multi-vendor valve PST management.

Companies that use ESD valves from more than one vendor have always had to plan and conduct separate PSTs for each valve type.

Provided that the valves are from the four companies participating in the VIP initiative, it is possible with PST Scheduler to collectively schedule and implement all PSTs.

Easy visualisation of schedule and status is ensured by showing the PST schedule and implementation status in a simple Gantt chart.

This PST Scheduler window can be viewed from any PC running the PRM package or from any operator station for the Centum series of integrated production control systems.

Major target markets include process industries such as oil and gas, chemicals, and pharmaceuticals.

Dresser Masoneilan’s SVI II ESD technology is claimed to be the first integrated Smart PST device to be integrated with Yokogawa’s Prosafe-RS safety instrumented system using a SIL-certified analogue output, allowing the SVI II ESD to capture the ESD shutdown event.

To set the PST settings of the SVI II ESD, the end user can connect using Dresser Masoneilan’s DTM software of Valvue ESD plug-in application.

The Valvue ESD plug-in also provides a means for automatically archiving PST signatures and their analysis.

The combination of VIP’s PST Scheduler and Dresser Masoneilan’s integration is said to provide the end user with a complete solution for managing the health of emergency shutdown valves.

Flowserve’s Logix MD positioners and DTM software integrate into Yokogawa’s PRM.

Used in conjunction with PRM’s PST Scheduler, customers are automatically alerted in the unlikely event that an ESD valve fails to operate within the PST limits set for the valve assembly.

In normal operation, Logix MD positioners, together with the Valvesight Diagnostic Management Software, are predictive tools.

The four elements of the valve assembly – the valve, actuator, positioner, and its control – are monitored continuously and without any process interruptions.

Valvesight will alert a customer through PRM before the valve response may affect the process.

This is done without any human intervention or subjective interpretation.

Metso’s Neles Valvguard, the automated PST solution with Metso’s DTM software, is integrated in Yokogawa’s PRM.

During the PST, Neles Valvguard can analyse the performance of ESD valves and give an automatic alert of potential problems in a valve.

When it is used with PST Scheduler, customers are able to perform effective PST that increases the reliability of ESD valves and improves the overall safety of their plants.

The information collected during the PST by Neles Valvguard can be further used in maintenance planning for ESD valves.

The Samson series 3730 positioners can be used for all ESD valve control tasks.

They feature comprehensive diagnostics, which include PST.

Providing local intelligence and diagnostic power, the positioners can be programmed locally or through PRM.

Diagnostics can also be done by either means.

For those functions performed at the valve, online communication is not required for performing diagnoses, taking measurements, evaluating signals, or creating alarms.

All parameters and diagnostic results are available in PRM and can be integrated into an asset management concept.

Samson positioners can be mounted on Samson valves with an integral attachment; however, they can also be used with standard mounting kits on any valve, providing good control and in-depth diagnostics.

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