Introduction to partial stroke testing

To achieve safe plant operation, individual safety instrumented systems (SIS) are required to be configured in parallel with the overall plant control system (DCS). Especially, the emergency shut-off valves must function when the production plant is pushed into a critical situation. To ensure a high probability that the valves will function when required, the application of partial stroke testing is a good solution saving both plant initial cost and running cost. Intelligent valve positioner and logic solver may be configured to provide this valve test function. This paper describes the full automatic partial stroke testing function implemented for petrochemical plant.