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How to size a T&P relief valve?

How to size a T&P relief valve?

How to size a T&P relief valve?

(OP)
I'm looking for sizing method for a temperature and pressure relief valve installed a domestic hot water storage tank. For normal operation, the pressure in the tank is about 80 psi and temperature is about 145F.

Many thanks.

RE: How to size a T&P relief valve?

(OP)
The tank volume is about 750 US gal and the water is heated by 2 750 MBH input boilers.

RE: How to size a T&P relief valve?

Hi, assuming yours is a typical residential DHW tank, I would suggest a 210F limit for temp. and 150psig for pressure. Please make sure all components in the system can withstand the above limits.  

Take a look at this valve:
http://www.drillspot.com/products/326591/Watts_LLL100XL_TandP_Valve  

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