Return to the Plumbing Forum | Post a Follow-Up

How to stop steam radiator water hammering?

Posted by blakk (My Page) on
Wed, Nov 23, 11 at 3:24

Hi, I just converted to gas from oil..I have a large 3 family with an old single pipe steam radiator system. The new boilers are around 82% efficient. It was installed in the summer, so I'm only now starting to work out the bugs!!
The main problem I'm having is trying to eliminate the noise (water hammering) associated with a steam radiator system. I have tried all the standard remedies related to this problem. I have drained and refilled the boilers several times, keeping the water level a little above half in the sight glass. I have made sure that each and every radiator is pitched towards the valve. I have insulated all the mains in the basement with 1000 degree fiberglass steam pipe insulation. I have even changed many of the vents at the radiators. While these actions have help significantly in reducing the water hammering noise! They have not totally eliminated them!

Any recommendations out there as to what more I can do to completely eliminate this problem?



Follow-Up Postings:

RE: How to stop steam radiator water hammering?

You probably have pipes that are no longer pitched correctly.

Single pipe steam systems rely on the pitch of the pipes to allow water to drain back to the boiler.

in older houses it is not uncommon for there to have been enough settling to disturb the pipe pitch.

This creates traps of water the interfere with the operation of the steam system and can cause noise, sometimes a lot of noise.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Plumbing Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here