pressure


  #1  
Old 10-31-06, 07:23 PM
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pressure

My boiler has about 23-25 psi when at 160-170F or so.
Seems like reducing valve adjusted to about 15psi and system holds it at 15 when cold.
Not that it ever trips the relieve valve but I'm just curious, is it normal or my expansion tank (#30)is too small ?"confused"? I think 23-25 is kinda high for one story house? What do y'all think?
 

Last edited by zaq123; 10-31-06 at 08:45 PM.
  #2  
Old 11-01-06, 05:03 PM
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What do you think guys? I realize water expends when hot but should I set up pressure reducing valve at 10-12 so it will be around 18-20 when hot?
 
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Old 11-01-06, 05:33 PM
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Normally you want your operating pressure to be a minimum of 10% less than the setting of the safety valve. That would be a maximum normal pressure of about 27psi so at 25 psi you are okay. Still, it wouldn't hurt to lower the cold pressure to the 10-12 psi range on a single-story home.

I would say that your expansion tank volume is minimal but acceptable.
 
  #4  
Old 11-01-06, 07:56 PM
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#30 Extrol

The only time I have seen a problem in using a #30 is on a high volume system such as cast iron radiators or unusually large piping. I agree the cold pressure need not be above 10-12#. Have you checked the pressure on the tank itself? If the tank was new it should have been precharged to 12# but once in a while I find one not charged properly.
 
 

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