Boiler Pressure


Old 03-16-05, 06:43 AM
Visiting Guest
Posts: n/a
Boiler Pressure

Hi, I have a old converted gravity hot water boiler with Extrol 2 gal. Expansion tank. The pressure gauge is at 12, the expansion tank at 12 psi. When the boiler comes on and the heat rises, the guage goes up too and is at 30 or so when the bolier shuts off. The feed valve is set at 12 psi and seems O.K. I noticed when the boiler was off the guage is at 12 normal but the expansion tank was low. When I put air back to 12 psi the guage went up to 20 and stays there. Can anyone tell me whats going on, I need advice thank you.
Sponsored Links
Old 03-16-05, 07:05 AM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,389

See if you get water out of the schrader valve on the tank there sounds like the bladder tank could be bad.

Old 03-16-05, 08:49 AM
Visiting Guest
Posts: n/a
Boiler Pressure

Hi Ed, There is a schrader valve on the pipe just before the tank, and water comes out when I press the valve stem. The schrader vale on the bottom of the tank itself, no water there, but I can put air in it.
Old 03-16-05, 09:02 AM
Join Date: Feb 2005
Location: Massachusetts
Posts: 123
You cant really put air in when the tank is attached to the system. If you have gravity hot water I would think that you have very large radiators and piping. You may need two extrol tanks. Maybe even two #60 extrol tanks.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes