October 2002

Special Report: Plant Safety and Reliability

Improve facility SIS performance and reliability

Use solenoids to partial stroke test block valves

Summers, A., Zachery, B., SIS-Tech Solutions, LLC

The safety instrumented system (SIS) standards, ANSI/ISA 84.01-19961 and IEC 61511,2 are providing new challenges for the hydrocarbon processing industry (HPI). One of the most difficult compliance issues these standards impose is the testing interval required for final elements, such as block valves. Most SIS block valves are function tested only at unit turnaround. The HPI is reaping benefits from good mechanical reliability programs, extending unit turnaround to five to seven years. When SIL 2 or SIL 3 performance is required, five-year function tests are inadequate. Consequently, many users are looking for ways to supplement the offline full-stroke test, such as online full-stroke testin

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