Steam pipe clanking

Old 09-10-09, 07:07 PM
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Join Date: Sep 2009
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Steam pipe clanking

I am hoping that some one can shed some light on this problem.

I work in an old school building that is heated with steam. We have pipes running everywhere above our heads and we are use to the "usual popping noises" that steam heat makes but in the last few months we are having incidents where this horrific clanking and pipe shaking has started early in the morning and stops right at 1 p.m. and, of course, our CE guys walk in at 1:10 and all the rukus has stopped. They seem not to know what might be causing it so I just thought I would run it by you guys out there who might have a clue.

Old 09-10-09, 08:46 PM
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Join Date: Jul 2007
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That is called water hammer. It is caused by water in a horizontal main pipe and steam hitting it.
Some causes;
Wet steam
Near boiler piping
Broken pipe hangers so pipe sags
Insulation missing on main piping
Boiler over fired
To name a few
Old 09-11-09, 02:07 PM
Join Date: Mar 2009
Location: USA
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The Hammer

I worked in the NYC schools and nothing compares with a 10" header with a water hammer, another thing to check are any traps that drain those lines. I dont know if you have gravity, or vacuum returns, but traps and any boiler equilizer lines should be in working condition.

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