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Water heater safety valves have a thermal feature too, to relieve pressure
based on excessive temperature as well as pressure. All pressure relief
valves should be exercised once a year. Ideally, they should be pressure-checked,
too to be sure they open at the set pressure. This is a requirement and must
be demonstrated during CG annual inspections of inspected vessels; also a
good idea aboard pleasure boats as well as for a home water heater. If you
haven't ever exercised the valve and it is an old one, don't be surprised if it
leaks afterward. And don't attempt to exercise a pressure relief valve unless
it has normal pressure on it as you may strain or break the relieving gear.
Regards,
John
"Seahorse"
>When I used to go on vacation or a cruise I used to turn off the water to my
hot water tank as it was over 20 years old. I also turned off the gas
heater and pilot. One year returning home late from a several week cruise I
lit the pilot and turned up the thermostat and sat down at my computer. I
do not remember how long it was but within less than a hour the hot water
tank blew up. Scared the hell out of me as I was near it. I forgot to turn
on the water input. The pressure relief valve failed for some reason. It
was a big mess but I shut everything down within seconds and now have a new
one.
My boat does have a large accumulator. I am not sure about a check valve.
Brent
**************Need a new ride? Check out the largest site for U.S. used car
listings at AOL Autos.
(http://autos.aol.com/used?NCID=aolcmp00300000002851)
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