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Relief valve sizing

Relief valve sizing

Relief valve sizing

(OP)
what is the proper way to size a relief for a home hot water heater 50 gallon gas 150000 to 180000 btu/hr input.  Need a #/hr calculation with a set pressure of 75 psig

RE: Relief valve sizing

Your relief valve relieving capacity will be in Btu/Hr and not in Lbs/Hr.  It rating will be the unit's heat input.  You should also have a temperature and set pressure ratings for a hot water heater.

RE: Relief valve sizing

if you must, calc the amount of water that can go through he orifice and mult by the weight of the water= pph or lbs/hr is the result

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