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Posted by Tom Stanton on March 24, 2002 at 12:02:37:
In Reply to: City water posted by Jack Carter on March 23, 2002 at 13:39:42:
When you say "enter a system" do you mean feeding directly into the boiler? If your city feed is attached directly to the boiler, most plumbing codes call for a check valve or back flow preventer and a stop valve. If you are talking about a high pressure steam boiler with a condensate return system, then the B31.1 Power Piping Code applies.