What percentage of MAWP do forced steam flow generator safety valves relieve?

Forced steam flow generator safety valves are designed to relieve pressure at the maximum allowable working pressure (MAWP) of the system. The purpose of a safety valve is to prevent overpressure conditions that could lead to catastrophic failures. By relieving at 100% of MAWP, these safety valves ensure that the pressure does not exceed the safe operating limits of the boiler system.

When the pressure inside the boiler reaches the MAWP, the safety valve opens to allow steam to escape, thus reducing the pressure to a safe level. This is crucial in maintaining the integrity of the boiler and ensuring safe operation. By adhering to this design specification, safety valves are able to provide an essential safety function in high-pressure steam systems.

Relieving at 50%, 75%, or 125% of MAWP would not fulfill the safety requirements expected from these critical components, as they would either allow for inadequate relieving capacity or exceed the designed safety parameters, potentially leading to dangerous situations. Therefore, the correct answer reflects the standard practice and safety guidelines in boiler operations.