Gas Fitter Practice Test

What should the relief valve for a low pressure steam system be set at?

1. 14.7 psia

2. 15 psig

3. 30 psia

4. 30 psig

The correct answer is: 15 psig

The relief valve for a low-pressure steam system is typically set at 15 psig. This is the standard pressure for low-pressure steam systems, as they are designed to operate below certain pressure limits for safety reasons. Setting the relief valve at 15 psig ensures that it will open to relieve pressure when it reaches this limit, which helps prevent exceedance of the safe operating pressure of the system. If the pressure were to rise above this threshold, it could indicate a malfunction, and the relief valve would act as a crucial safety device to prevent potential damages or hazards such as ruptures or explosions. This specific setting aligns with industry practices and safety regulations for low-pressure steam applications. Other pressures, such as 14.7 psia, 30 psia, or 30 psig, either exceed what is considered safe for low-pressure steam systems or do not reflect typical operational parameters for such systems.