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Posted by nospam@gmail.com on December 13, 2008, 9:08 pm
I am replacing my water heater expansion tank. It is leaking at the
weld (piece of carp). Anyway my question assumes the following:
H2O pressure measured at hose bib: 80 PSI
System pressure recommended by expansion tank mfr: 60 PSI
New tank max PSI: 100
My questions:
Do I just add more air to get to 80 PSI?
Is a small electric tire compressor ok or must it be a hand/tire pump?
TIA
Rob
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Posted by Ernie Willson on December 13, 2008, 10:19 pm
If the water pressure is 80 PSI then it will pressurize any entrapped
air to the same pressure. You do not need to put any air in. Even if you
managed to get all the air out the system pressure would be the water
pressure...80 psi.
EJ in NJ
nospam@gmail.com wrote:
show/hide quoted text
> I am replacing my water heater expansion tank. It is leaking at the
> weld (piece of carp). Anyway my question assumes the following:
>
> H2O pressure measured at hose bib: 80 PSI
> System pressure recommended by expansion tank mfr: 60 PSI
> New tank max PSI: 100
>
> My questions:
> Do I just add more air to get to 80 PSI?
> Is a small electric tire compressor ok or must it be a hand/tire pump?
>
>
> TIA
>
> Rob
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Posted by Bubba on December 14, 2008, 12:12 pm
Ernie,
You are a freakin idiot.
You pressurize the new tank to match the pressure of the incoming
water to the home.
With your thinking, why would they even put ANY air in the tank at
all.
How you pump the tank up makes no difference. Just match it to the psi
in your home.
Bubba
On Sat, 13 Dec 2008 22:19:34 -0500, Ernie Willson
show/hide quoted text
>If the water pressure is 80 PSI then it will pressurize any entrapped
>air to the same pressure. You do not need to put any air in. Even if you
>managed to get all the air out the system pressure would be the water
>pressure...80 psi.
>EJ in NJ
>nospam@gmail.com wrote:
>> I am replacing my water heater expansion tank. It is leaking at the
>> weld (piece of carp). Anyway my question assumes the following:
>>
>> H2O pressure measured at hose bib: 80 PSI
>> System pressure recommended by expansion tank mfr: 60 PSI
>> New tank max PSI: 100
>>
>> My questions:
>> Do I just add more air to get to 80 PSI?
>> Is a small electric tire compressor ok or must it be a hand/tire pump?
>>
>>
>> TIA
>>
>> Rob
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Posted by justalurker on December 14, 2008, 12:22 pm
> Ernie,
> You are a freakin idiot.
> You pressurize the new tank to match the pressure of the incoming
> water to the home.
> With your thinking, why would they even put ANY air in the tank at
> all.
> How you pump the tank up makes no difference. Just match it to the psi
> in your home.
> Bubba
> On Sat, 13 Dec 2008 22:19:34 -0500, Ernie Willson
> >If the water pressure is 80 PSI then it will pressurize any entrapped
> >air to the same pressure. You do not need to put any air in. Even if you
> >managed to get all the air out the system pressure would be the water
> >pressure...80 psi.
> >EJ in NJ
> >nos...@gmail.com wrote:
> >> I am replacing my water heater expansion tank. It is leaking at the
> >> weld (piece of carp). Anyway my question assumes the following:
> >> H2O pressure measured at hose bib: 80 PSI
> >> System pressure recommended by expansion tank mfr: 60 PSI
> >> New tank max PSI: 100
> >> My questions:
> >> Do I just add more air to get to 80 PSI?
> >> Is a small electric tire compressor ok or must it be a hand/tire pump?
> >> TIA
> >> Rob
Here you go... http://www.watts.com/pdf/1915356.pdf step-by-step
instruction for adjusting the pre-charge of a potable water thermal
expansion tank.
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Posted by nospam@gmail.com on December 14, 2008, 1:47 pm
Bubba-
Thanks for the additional info. I just went out and checked the
tank...no change from the factory charge. Eddie wasn't as helpful as
he could have been, that's for sure. Why would someone reply with a
wrong answer... Damn newsgroups aren't what they once were. I'm headed
out to get some type of pump. Then, I'll come back and turn off the
water, discharge the system then, re-pressurize.
What pissed me off more was when I called the local water utility to
find out what the pressure might be. He said it varies from meter to
meter call a plumber. After he asked for my address. A $10 gauge from
the underground sprinkler system gave me the answer.
All in all I figure this probably saved me from a plumber's overtime/
weekend rates.
Rob
show/hide quoted text
> Ernie,
> You are a freakin idiot.
> You pressurize the new tank to match the pressure of the incoming
> water to the home.
> With your thinking, why would they even put ANY air in the tank at
> all.
> How you pump the tank up makes no difference. Just match it to the psi
> in your home.
> Bubba
> On Sat, 13 Dec 2008 22:19:34 -0500, Ernie Willson
> >If the water pressure is 80 PSI then it will pressurize any entrapped
> >air to the same pressure. You do not need to put any air in. Even if you
> >managed to get all the air out the system pressure would be the water
> >pressure...80 psi.
> >EJ in NJ
> >nos...@gmail.com wrote:
> >> I am replacing my water heater expansion tank. It is leaking at the
> >> weld (piece of carp). Anyway my question assumes the following:
> >> H2O pressure measured at hose bib: 80 PSI
> >> System pressure recommended by expansion tank mfr: 60 PSI
> >> New tank max PSI: 100
> >> My questions:
> >> Do I just add more air to get to 80 PSI?
> >> Is a small electric tire compressor ok or must it be a hand/tire pump?
> >> TIA
> >> Rob
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> weld (piece of carp). Anyway my question assumes the following:
>
> H2O pressure measured at hose bib: 80 PSI
> System pressure recommended by expansion tank mfr: 60 PSI
> New tank max PSI: 100
>
> My questions:
> Do I just add more air to get to 80 PSI?
> Is a small electric tire compressor ok or must it be a hand/tire pump?
>
>
> TIA
>
> Rob