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Whats the routine for fitting a new expansion tank? HELP At what pressure should the overpressure relief valve lift?

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Hello, not know the size of your system I can only give you the standard answer. Most expansion tanks are sized by the amount of water they will hold, however a rule of thumb has been a smaller 4 zone system will have a 7 gallon tank with 12 psi charge. Larger systems will sometime go has much as 30 gallons but, the charge is still 12psi. The relief valve should be a 30psi set but, again on larger systems it will be 50 psi. The 12psi is a standard auto fill valve max and you want to match the charge of the expansion tank to the auto fill valve setting. Hope this helps.

Posted on Dec 30, 2010

  • Tim Dehnke Dec 30, 2010

    I will add this about the relief valve, if it is leaking it will most likely be due to the expansion tank being full of water and not half air. most tanks have a rubber bladder in them and sometimes that leaks and fills with water and cause the heating system to leak while they are heating up.

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Hi,
Just turn off the water relieve the pressure and then turn out the old tank and turn in the new one...make sure the water is not too hot that it will burn you...

The relief valve should lift at 30 psi....

heatman101

Posted on Dec 30, 2010

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Otherwise, put 1 gallon bucket under TP release pipe to catch water.
http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#drip-pan

When you say relief valve, I assum you are talking about brass valve located on top of tank or near top of tank. This is TP valve and a pipe connects to this valve and runs down to within 6" of bottom of tank. TP valve has a small lever on it.
If you are talking about tank drain valve located at bottom of tank, then add a comment.
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Dripping TP valve can be caused by 3 different thing:

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2) Defective TP valve: replace TP valve. Turn off electricity to water heater. Let heater cool for several hours so you do not get scalded. Close shut off valve located above tank on cold side. Open tub spout to relieve pressure, open tank drain or open TP valve and empty water below TP valve level. If TP is located on top of tank, not much water has to be drained. Tank is under press when hot, so be careful. Put teflon tape on new valve and install with big pipe wrench by turning clockwise until TP valve is very tight.

3) Overheating tank. TP valve is temperature-pressure valve. If tank water is over 150 degrees, the TP valve starts drizzling hot water to relieve tank pressure.
Lower tank pressure two different ways:
a) turn down thermostat
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
b) install expansion tank on incoming cold water line
http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#expansion-tank

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