xpansion tank pressure


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Old 12-21-06, 10:07 AM
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Talking xpansion tank pressure

hello, if my expansion tank pressure is 12psi,and my boiler water pressure is 18,do i have to add alittle more air pressure to the tank?thanks
 
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Old 12-21-06, 03:41 PM
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Originally Posted by refer guy
hello, if my expansion tank pressure is 12psi,and my boiler water pressure is 18,do i have to add alittle more air pressure to the tank?thanks
Depends... how did you measure the expansion tank pressure ?

Is that boiler pressure cold, or hot ?

If it's a big enough tank, you probably wouldn't have a problem. It could have the reserve capacity to handle the expansion. If the tank is marginally sized, you could see the pressure go up too high when the system got hot, possibly high enough to pop the 30 lb relief valve.

But, if it ain't broke...
 
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Old 12-21-06, 07:42 PM
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If you didn't take pressure off the boiler, the tank pressure and the boiler pressure will be the same. The boiler pressure gauge is probably not accurate. The expansion tank pressure should be between 12 and 15 psi.

Ken
 
 

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