Remote Isolation Valve (RIV) Fire-Protection Requirement
We use pneumatic RIVs in our system for shut-off operation during emergency condition (for example, fire). Two valve types selected used in these services, one is Ball valve, and the other is Triple Eccentric Butterfly valve. All air failure to close (AFC) design.
Since AFC design, we didn’t make specific fire protection requirement for actuators of RIVs.
There is a revamp project, licenser request actuators and instruments of RIVs shall be protected by thermal insulated boxes. According to information from vendors, the box is heavy and difficult to maintain.
Do we need fire-proof actuator even AFC design?