DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Water hammer after kitchen mixer tap change


 
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
Andy165

from United Kingdom

Joined: 09 Nov 2007
Posts: 574
Location: Merseyside,
United Kingdom
Thanked: 31 times

PostPosted: Thu Nov 19, 2009 9:12 pm Reply with quote

Changed a kitchen mixer tap (washer type) to customers new ceramic disc mixer tap and am now getting water hammer in cold mains supply pipe. Have installed "Hammer Arrester" close to mixer tap which has helped a little. Also put on a Pressure Reducing Valve but it made no difference. Existing pipes buried in kitchen wall behind units, stop tap in street quarter turn type. Any sugestions for remedy before customer drives me nuts. Have looked at other threads on water hammer but they offer no extra advice/ solutions.
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
Elkato531

from United Kingdom

Joined: 22 Jul 2009
Posts: 366
Location: Sussex,
United Kingdom
Thanked: 68 times

PostPosted: Thu Nov 19, 2009 9:38 pm Reply with quote

If, as you say you've already fitted a hammer arrester the problem is probably due to the pipework being insufficently clipped where you can't get to it.

I assume that you've fitted the tap the customer wanted and done what you can to alleviate the hammer problem. The fault is not with the work you've done but with the pipework. Unless they want you to start pulling apart their kitchen, they may just have to learn to turn the tap off slowly.
Back to top
The following user says thank you to Elkato531 for this useful post:
Andy165 (20 Nov 2009)
 Alert Moderators
compheat

from United Kingdom

Joined: 22 Nov 2005
Posts: 1896
Location: Lancashire,
United Kingdom
Thanked: 314 times

PostPosted: Thu Nov 19, 2009 9:46 pm Reply with quote

Try turning down internal stop tap.
The pressure in my own house is approx 6bar and when stop tap is on full i get water hammer but if its turned down slightly its ok.
Back to top
The following user says thank you to compheat for this useful post:
Andy165 (20 Nov 2009)
 Alert Moderators
Andy165

from United Kingdom

Joined: 09 Nov 2007
Posts: 574
Location: Merseyside,
United Kingdom
Thanked: 31 times

PostPosted: Fri Nov 20, 2009 12:03 am Reply with quote

Thanks for the replies. The internal stop top does not control the cold main pipe to the kitchen sink. The lead pipe branches off under the solid kitchen floor before the stop tap, and then somewhere behind the units joins onto copper.The kitchen tap cold feed has to be isolated by the roadside stop tap (quarter turn). Odd I know, but the house is about 70 years old.
Back to top
 Alert Moderators
Whitespirit66

from United Kingdom

Joined: 15 Dec 2007
Posts: 6402
Location: Bristol,
United Kingdom
Thanked: 578 times

PostPosted: Fri Nov 20, 2009 12:10 am Reply with quote

I had this problem after changing a customer's tap once. Turned out it was the washer in the stop tap that had broken up. The metal stop tap jumper was moving and banging when a tap was turned on or off.

The stop tap washer must have broken up when I used it to turn the water off. Just a thought.
Back to top
 Alert Moderators
JayJay1978

from United Kingdom

Joined: 19 Feb 2009
Posts: 312
Location: Bradford,
United Kingdom
Thanked: 24 times

PostPosted: Fri Nov 20, 2009 12:47 pm Reply with quote

Did you fit any isolation valves on the kitchen tap?

Trouble is they are not designed to reduce flow and increases the water 'hiss'.

I read somewhere that fitting a non return valve on the pipe underneath the tap would halt the 'shockwave' and stop the water hammer. Does anyone know if this is true?

Was the shock arrester like this one?

http://www.toolstation.com/shop/Plumbing/Valves/Potable+Water+Shock+Arrestor+12+MBSP/d20/sd2696/p93058
Back to top
 Alert Moderators
Andy165

from United Kingdom

Joined: 09 Nov 2007
Posts: 574
Location: Merseyside,
United Kingdom
Thanked: 31 times

PostPosted: Fri Nov 20, 2009 6:44 pm Reply with quote

Kitchen mixer tap came with its own non-return valves which were fitted, as well as large bore isolating valves. Water hammer arrester was long cylindrical type cost 24.99 from local merchants. The ball type one shown on your thread, PTS wanted 34 for it icon_eek.gif
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
water hammer at kitchen tap 4 180 Wed Aug 17, 2011 1:56 pm
Pressure Reducing Valve/Water Hammer & other plumbing ad 2 107 Wed Feb 02, 2011 3:08 pm
Water Hammer When Motorised Valve Closes 9 340 Sat Feb 05, 2011 8:42 pm
S Plan water hammer 8 580 Tue Jan 27, 2009 8:46 pm
Water Hammer 3 360 Wed Oct 29, 2008 10:51 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.