Can an SIS system use electric valves?
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The company’s storage tank area was previously controlled manually; now a safety instrumented system is to be installed, and there is no gas supply available in the vicinity
The key issue is whether the electric valve has a SIL certification; its operating speed is slow, and it is unclear whether the safety authorities will approve its use as an emergency shut-off valve.
There is no rule stating that SIS cannot use electric valves
Sure, check the tank area design specifications. Design Code for Automation Systems of Petrochemical Tank Areas
In tank areas, we use electric emergency shut-off valves in many applications; these can be combined with combustible gas alarm devices, level sensors, and fire protection system interlocks
Yes, but it depends on the response time of the electric valve
The tank area here also uses electric valves, and there are no problems.