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Home > Archive > Home Repair forum > August 2005 > Hot water tank pressure relief
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Hot water tank pressure relief
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| C & M 2005-08-30, 12:21 pm |
| I was staring at this valve the other day - yea, I have no life to speak
of - and saw how the end was not vented into anything. There aren't any
drains nearby but I was thinking that a PVC standpipe with a hose coupling
at the bottom would handle the catch and the draining. THe question is, how
much water is vented when a valve opens? That would determine the diameter
of the standpipe.
TIA,
C
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| Joseph Meehan 2005-08-30, 12:21 pm |
| C & M wrote:
>I was staring at this valve the other day - yea, I have no life to
>speak
> of - and saw how the end was not vented into anything. There aren't
> any drains nearby but I was thinking that a PVC standpipe with a hose
> coupling at the bottom would handle the catch and the draining. THe
> question is, how much water is vented when a valve opens? That would
> determine the diameter of the standpipe.
> TIA,
> C
The most common amount is just a few ounces or less. If the valve
fails, it could be thousands of gallons, but this kind of failure would be
very rare. I think the most usually would be only a gallon or two.
--
Joseph Meehan
Dia duit
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| Edwin Pawlowski 2005-08-30, 1:21 pm |
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"C & M" <ironhat@innernet.net> wrote in message
news:df1r5l01jkg@enews4.newsguy.com...
>I was staring at this valve the other day - yea, I have no life to speak
> of - and saw how the end was not vented into anything. There aren't any
> drains nearby but I was thinking that a PVC standpipe with a hose coupling
> at the bottom would handle the catch and the draining. THe question is,
> how
> much water is vented when a valve opens? That would determine the
> diameter
> of the standpipe.
> TIA,
From a few ounces to a few hundred gallons. Sometimes these valves open and
do not reseat properly and the water will continue to run until you shut the
inlet valve.
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"C & M" <ironhat@innernet.net> wrote in message
news:df1r5l01jkg@enews4.newsguy.com...
> I was staring at this valve the other day - yea, I have no life to speak
> of - and saw how the end was not vented into anything. There aren't any
> drains nearby but I was thinking that a PVC standpipe with a hose coupling
> at the bottom would handle the catch and the draining. THe question is,
how
> much water is vented when a valve opens? That would determine the
diameter
> of the standpipe.
> TIA,
> C
Some areas of the US will not allow the temp/pressure valve to be vented
inside. at least not any more. When one goes on temperature it can be
really dramatic. It will vent until the temperature/pressure is low enough
for the valve to reset.
Diameter of the vent depends on the length of the pipe and number of elbows.
PVC is a really bad idea. If the relieve valve goes cause of temperature
then the PVC is going to melt. All of the drains I have seen are usually in
copper pipe. I remember seeing a really old installation done in galvanized
pipe.
Check with a pro in your area
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| Since there isn't a drain anywhere near I'm wondering if I could rout this
upward and out the sill ot the outside. But then I'd have a critter or
insect issue. Guess I'd better call a plumber.
"C & M" <ironhat@innernet.net> wrote in message
news:df1r5l01jkg@enews4.newsguy.com...
> I was staring at this valve the other day - yea, I have no life to speak
> of - and saw how the end was not vented into anything. There aren't any
> drains nearby but I was thinking that a PVC standpipe with a hose coupling
> at the bottom would handle the catch and the draining. THe question is,
how
> much water is vented when a valve opens? That would determine the
diameter
> of the standpipe.
> TIA,
> C
>
>
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| Stretch 2005-08-30, 11:21 pm |
| C
IIRC, The relief valve discharge pipe should be 15 feet or less with a
maximum of 4 elbows. That would be 3/4" pipe or tubing. More elbows
or more pipe would require larger pipe, like 1". Under NO
circumstances should the pipe run uphill for even a short distance. It
should terminate outside between 6" and 18" above finish grade.
Stretch
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