New York Low Pressure Boiler COF Practice

At what pressure is a 400 psi boiler hydrostatically tested?

1. 400 psi

2. 500 psi

3. 600 psi

4. 700 psi

The correct answer is: 600 psi

A 400 psi boiler is typically hydrostatically tested at a pressure that exceeds its maximum allowable working pressure to ensure safety and integrity. The test pressure is generally set at 1.5 times the maximum allowable working pressure of the boiler. For a boiler rated at 400 psi, this means that the hydrostatic test pressure would be calculated as follows: 400 psi multiplied by 1.5 equals 600 psi. This testing is crucial for verifying that the boiler can withstand higher pressures without leaking or failing. Conducting the hydrostatic test at this elevated pressure helps to identify any potential weak points in the construction of the boiler before it is put into service. Therefore, the correct value for the hydrostatic test pressure of a 400 psi boiler is indeed 600 psi.