Desuperheaters shall be hydrostatic tested at what pressure?

The correct testing pressure for desuperheaters during hydrostatic testing is set at 350 psig. This standard is established to ensure the structural integrity and safety of the desuperheater under operational conditions. The hydrostatic test involves filling the desuperheater with water and pressurizing it to a specific level to check for leaks and the ability to withstand operating pressures.

A hydrostatic test at this pressure level helps to simulate the maximum expected service conditions while providing a sufficient safety margin. This practice is crucial for maintaining system reliability and preventing potential failures during operation. The selected pressure balances the need for an effective test with the inherent risks involved in over-pressurizing components that may lead to unnecessary wear or damage.

Hydrostatic testing at any of the other mentioned pressures could potentially compromise the testing standards required for ensuring safety and reliability in operation.