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Posted by HeatPro on September 27, 2004 at 07:54:56:
In Reply to: Increasing pressure in system posted by Neil on September 27, 2004 at 07:33:31:
When the expansion tank fails there is no way to relieve hydraulic pressure as water expands ehen heated.
See
THE FUNCTIONS OF AN EXPANSION TANK
http://64.226.150.132/hydronic/des/start.htm#Expansion
and
http://64.226.150.132/hydronic/service/purgeair.htm