Re: O/T HOT WATER HEATER POP OFF VALVE

Posted by Gerald J. on January 06, 2007 at 11:39:01 from (67.0.97.149):

In Reply to: Re: O/T HOT WATER HEATER POP OFF VALVE posted by Allan In NE on January 06, 2007 at 04:33:36:

Usually its the bottom that leaves first. Because thats where the rust is worst.

But figure the effect of raising 40 gallons of water from 50 degrees to 140 degrees in a tank with no place for the water to expand do (faucets shut off, a check valve at the meter). A few hundred PSI is possible if the tank is strong enough.

Then figure the pressure rise going to steam at 235 degrees when the thermostat contacts (electric) weld or gas valve sticks open. Figure 10,000 btu per hour for round input numbers.

Gerald J.

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