September 2001

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HP Automation Safety: Partial valve stroke testing

Some of the new technology in safety instrumented systems includes smart valve positioners that run diagnostics. These devices automatically run a partial valve stroke test of the valves and actuators..

Goble, W., exida LLC

Some of the new technology in safety instrumented systems includes smart valve positioners that run diagnostics. These devices automatically run a partial valve stroke test of the valves and actuators. The concept is quite appealing. When one looks at the major source of trouble in design of a safety instrumented function, it is often the final element – the solenoids, actuators and valves. When a probability of failure on demand average (PFDavg) calculation is made and a single valve is part of the loop, that valve assembly often is the limiting factor for the whole loop. The primary reason is lack of diagnostics. Remember that in a safety application, the final element often sits wi

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