have a problem with water hammer. this happens with hot and cold water. would fitting a none return valve on the outlet side of stop cock fix this? have turned the pressure down and no change. nor does increasing the pressure make any difference. any help would be appreciated thanks.
water hammer
- Thread starter shadowdandy
- Start date
Sponsored Links
- Joined
- 11 Jan 2004
- Messages
- 42,708
- Reaction score
- 2,629
- Country
Isn't it exacerbated by insufficiently fixed pipes?
N
Newboy
What are the symptoms - single 'clunk' or vibration?
Do certain taps or appliances trigger it or does it occur throughout the property?
Can you measure the incoming cold main pressure?
Do certain taps or appliances trigger it or does it occur throughout the property?
Can you measure the incoming cold main pressure?
Do you mean that you have adjusted the mains stopcock - adjusting this doesn't change pressure, it changes flowrate.
Quarter turn taps and loose pipe work?
Andy
Andy
Sponsored Links
N
Newboy
?
the noise is a single clunk, but very loud. it occurs throughout the property. unable the measure the main pressure. yes, I mean the main stopcock. if its turned right down, the noise is very faint, but the flow rate is very low. thanks.
But isn't flow (mass flow) roughly equivalent to pressure anyway?
I have the same issue as the OP and the water hammer we get is sometimes very dramatic. By reducing the flow of water, the pressure in the pipes does reduce and the water hammer stops but at the cost of not being able to shower and use a tap at the same time!
I have checked pipework where the water hammer is heard from (at the incoming mains) and felt the pipe physically move. Having taken out a kitchen unit to inspect though, all pipework is visibly secured to the wall well so I presuming I need a water hammer arrestor fitting.
N
Newboy
What triggers the 'clunk'?
the noise happens when cistern has filled, and when I close the hot and cold taps.
N
Newboy
Guessing that they are 1/4 turn taps.
Sounds like you have high incoming mains pressure in which case either a Pressure Reducing Valve or a shock arrestor may help. It would be useful to know what your incoming mains pressure is.
Try this on an external bib-tap if you have one. https://www.screwfix.com/p/monument-tools-mains-water-pressure-test-gauge/82412
Sounds like you have high incoming mains pressure in which case either a Pressure Reducing Valve or a shock arrestor may help. It would be useful to know what your incoming mains pressure is.
Try this on an external bib-tap if you have one. https://www.screwfix.com/p/monument-tools-mains-water-pressure-test-gauge/82412
N
Newboy
No
Pressure (differential) is what causes flow. Also worth noting the difference between static and dynamic pressure.
Clearly my understanding of these principles are wrong! Thanks for the info.
quick update. had a prv fitted today, all is now quiet. thanks for all the replies.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links
