Safety shutdown valves are by far the largest source of failure in the safety system. Testing of the shutdown valve is important to maintaining the integrity of the safety system. Partial stroke test ensures the valve is able to move during a demand. It can also detect some of valve associated problems such as torque/ friction degradation, issues with pneumatic pressurized path, valve integrity, stick- slip phenomena, etc. During PST testing, the system is always available should a demand occur. It is common to see a solenoid valve being used with the digital valve controller. Verifying a solenoid valve plunger movement during testing could be difficult. Therefore, the following subjects will be discussed in this Webinar:
- Introduction of DVC6200 SIS
- Safety versus availability
- Diagnostic results from a partial stroke test
- On-line triggered capability of digital valve controller is a great tool which can be used to capture the event during a demand
- A method of monitoring the health of a solenoid valve mounted downstream in pneumatically series with digital valve controllers
- Diagnostic tools that can be used during proof testing in order to check the safety valve integrity