I have a tiny leak in one of thepipes inside the house, however the
plumber that I usually work with was unable to come and fix it before
next Monday (it's Wednesday today). so I intend to shutdown the main
supply valve each time I leave a house in oredr to prevent from the
leak to spread.
Is there any way shuting down the main valve is dangerous or
undesirable? Can it hurt if I leave the water off for 8 hours?
Make sure you turn off your hot water system as well. A lot of systems use
the cold side for their expansion, if the main is closed this could result
in excesive pressure in the system causing more damage.
Better safe than sorry!
Or the relief valve on the boiler. But you're right in saying that hot
water system pressure has to go back to the water main in the street, unless
an expansion tank is installed.
Turn off the water heater when shutting the main to the house all day.
now ponder this...the majority of the people who do shut off their water
when leaving for vacation or a prolonged (sp) period do so after finishing
up their morning tasks including showering and dishes. The domestic hot most
likely hasn't recovered and is still expanding while being heated. Why risk
it poping the PT, packing and piss poor joint that has been hanging on by a
thread? True, it will most likely blow the PT valve before anything else,
now you know as well as I do that unless it's a fairly new valve it does
have a very high chance of not re-seating itself. Now the HO comes home and
turns on the water, doesn't know that the PT is leaking and finds a small
flood hours or even days later.
Bottom line, if your paranoid to the point of shutting of your main while
leaving for vacation, why chance it when you can simply throw a breaker or
at worse shut off a gas valve and have to relight the pilot upon returning?
In my area almost all the water companies require a dual check valve on the
customer side of the meter, so the cold side cannot be used for expansion.
But an expansion tank on the water heater is also required so shutting off
the water heater is not necessary.
you're overthinking this.....we're not talking about what to do with rapidly
expanding gas as we try to launch the space shuttle for christs sake. i'm sure
that problems occur as you describe when the planets line up the right way and
the pope crosses himself from the left instead of the right. bottom line.....if
this was such a hugh problem.....there would be some government agency spending
more of my tax money looking for a way to blame the former administration for
it. as it stands now, since it is that it happens probably in one out of 52
billion births, i still say ' fuck it'
Sorry but once the push is stopped at the main the only pressure in
the system would come from trapped compressed air or expanded hoses
such as the washing machine. So without the above it IS non existant.
Now since a standard domestic water system uses the cold
Maybe the T&P? Thats what they're for. If its a sweated joint you've
got bigger problems.
Mark my response was to pressure building in a closed system, the T&P
should be the first to go. Your response was:
"pressure is going to be released at the weakest point in the system
usually an old packing gland or possibly a sweated joint".
If your sweated joints pop at 150lbs you've got bigger problems.
when you turn of the main to the house?
imagine my surprise at having to connect the dots to another plumber....it was
my assumption that a faucet would have been opened to blow the pressure, ergo
zero pressure on the cold side. <should i explain the term 'ergo' or are you ok
with that one?>
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