Results 1 to 4 of 4
Plumbing & Plumbers Forum - New pipes causing water hammer - pls help
Like Tree1Likes
  • 1 Post By Subby

New pipes causing water hammer - pls help

Discuss New pipes causing water hammer - pls help at UK Plumbers Forums; Hi Im a new member with a problem - Our upstairs water supply comes under the floor boards in a bedroom into a toilet then through a wall into the ...
  1. #1
    Member
    Join Date
    Sep 2014
    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default New pipes causing water hammer - pls help

    Hi Im a new member with a problem - Our upstairs water supply comes under the floor boards in a bedroom into a toilet then through a wall into the bathroom . we have replaced the section of 2metre piping in the bathroom. but every time we flush the toilet the pipes are making a hammering noise which seems to come from the 'old' piping under the floor boards in the bedroom. the old pipe is 22m but the new pipe is 15m - do I need to replace all piping. I hope not? Any advice

  2. #2
    Plumbers Arms member JCplumb's Avatar
    Join Date
    Mar 2012
    Location
    Bolton
    Posts
    2,102
    Thanks
    73
    Thanked 242 Times in 237 Posts

    Default Re: New pipes causing water hammer - pls help

    First thing to try is to clip the pipe, not just the new section but all of the run. My thinking is that the old 22mm was much sturdier stuff than the new 15mm and this new section will have weaked the span of pipe.
    I doubt you can have too many clips, but you can have too few - so don't be shy with them
    The regs say 1.2m intervals for 15mm copper, I'd over cook that a little if I was trying to resolve a water hammer issue.

  3. #3
    Plumbers Arms member
    Join Date
    Jan 2009
    Location
    Corsham, Wiltshire
    Posts
    1,723
    Thanks
    29
    Thanked 74 Times in 71 Posts

    Default Re: New pipes causing water hammer - pls help

    Shock arrestor? Surely having restricted the flow going from 22 to 15 it has now speeded up the velocity (Bernoulli principle ) whereas prior you had the larger bore pipe.

  4. #4
    Member

    Join Date
    Sep 2012
    Location
    Cardiff
    Posts
    429
    Thanks
    47
    Thanked 30 Times in 29 Posts

    Default Re: New pipes causing water hammer - pls help

    It is quite possible that your fill valve was fitted without the flow restrictor. Replace the WC fill valve with a fluidmaster or similar, this should stop any water hammer. Failing that you could fit a shock arrestor near the WC end of the pipe run.
    josh likes this.

Everybody loves a good deal: Deals and Discounts on Dozens of Powertools!
Everybody loves a good deal: Deals and Discounts on Dozens of Powertools!

Similar Threads

  1. Replies: 8
    Last Post: 27-07-2013, 07:50 PM
  2. Combined F & E pipes causing 3 rads to not perform
    By buryboy in forum Central Heating Forum
    Replies: 19
    Last Post: 08-12-2012, 01:23 PM
  3. Replies: 22
    Last Post: 19-12-2011, 08:27 PM
  4. Cold weather causing noisy pipes
    By jase158 in forum Fittings & Pipes
    Replies: 3
    Last Post: 29-01-2011, 07:09 PM
  5. What is causing my pipe hammer...?
    By mykeyj in forum Plumbing Forum
    Replies: 3
    Last Post: 20-03-2010, 02:12 AM

Visitors found this page by searching for:

new pioe plumbing

Tags for this Thread


Try our Talk Electrician Forum and our popular Tilers Forums for more free advice from professional tradesmen.
Tens of thousands of tradesmen and over 2 million combined posts.


Plumbers Forums is a community-driven forum shared between all members.