Pressure Relief Valve Calculator
Steam/Hot Water PRV
Calculate relief valve capacity for steam or hot water systems
Formula
Relief Capacity = Boiler Input (for hot water) or Boiler Input / 970 (for steam lbs/hr)
Frequently Asked Questions
What is a pressure relief valve?
A PRV is a safety device that opens to release pressure when it exceeds a set point, preventing vessel rupture. Required by code on all boilers and water heaters.
How do I determine PRV set pressure?
The set pressure must not exceed the maximum allowable working pressure (MAWP) of the vessel. For residential water heaters, this is typically 150 PSI and 210F.
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