Under what condition does a superheater safety valve's relieving capacity count towards the total relieving capacity?

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The relieving capacity of a superheater safety valve counts towards the total relieving capacity when the superheater cannot be isolated. This is because, in situations where the superheater remains directly connected to the boiler and cannot be taken offline or isolated from the system, it plays a critical role in managing overpressure conditions. The safety valve then becomes essential in preventing boiler overpressure by relieving excess steam generated in the superheater.

When the superheater can't be isolated, any pressure build-up in the superheater directly affects the pressure in the boiler system. Therefore, the safety valve's capacity to relieve pressure in this scenario is imperative for ensuring overall system safety. It is different when the superheater can be isolated; in that case, the relieving capacity of its safety valve might not need to be accounted for in the total because the superheater is effectively separated from the pressure conditions of the boiler.

The other conditions, such as operating at full capacity or the size of the valve, do not directly determine the relevance of the superheater safety valve's relieving capacity in relation to total system capacity in the same manner. The critical aspect is whether the superheater can be isolated or not, highlighting its dependency on the operational state of the system.

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