Bang when cold tap is turned on
Discussion
In the last few weeks whenever I turn on the cold tap there is now a very big bang and even worse when the washing machine draws.
It's only started in the last few weeks so I'm not sure what has changed.
Any ideas?
I have isolation valves on the bathroom and kitchen (2 bed flat).
One of my mates is a plumber but he is stacked with work and has cancelled on me 3 times and the OH is keen to get this fixed. He reckons either a tap or the toilet may have a failing valve?
I'm going to try draining the system down and refilling and see if it helps.
It's only started in the last few weeks so I'm not sure what has changed.
Any ideas?
I have isolation valves on the bathroom and kitchen (2 bed flat).
One of my mates is a plumber but he is stacked with work and has cancelled on me 3 times and the OH is keen to get this fixed. He reckons either a tap or the toilet may have a failing valve?
I'm going to try draining the system down and refilling and see if it helps.
Is it water hammer? It can start if the water board have upped the supply pressure.
Fit one of these onto the washing machine supply:
https://www.screwfix.com/p/thomas-dudley-ltd-dw660...
Fit one of these onto the washing machine supply:
https://www.screwfix.com/p/thomas-dudley-ltd-dw660...
RicksAlfas said:
Is it water hammer? It can start if the water board have upped the supply pressure.
Fit one of these onto the washing machine supply:
https://www.screwfix.com/p/thomas-dudley-ltd-dw660...
I have one near the stop cock, but it may have lost it's charge, although it may be beneficial to put one near the washing machine. Fit one of these onto the washing machine supply:
https://www.screwfix.com/p/thomas-dudley-ltd-dw660...
I'll have to get someone to test the pressure. I can't be sure whether the pressure has gone up recently.
Fastchas said:
Water hammer but normally occurs when turning the tap off.
Yes, no noise when the flow starts, but a bang when the flow stops. In my experience it can be caused if the supply pipe is not adequately supported. What seems to happen is that when the flow stops abruptly the pressure rises very suddenly and caused the pipe to move and bang against some adjacent object such as a floor, joist or wall etc.If this is the cause, arranging a better support for the section of pipe is the best answer.
You can also get a little device to fit into the pipework, which amounts to a small buffer vessel containing air. This provides a cushion which absorbs the shock by smoothing out the pressure rise that has been causing the problem....if you see what I mean.
This device, by the way, can be obtained from Screwfix - or was it Toolstation - I can't remember which, but I've seen them in the catalogue.
Edit: Sorry, I've just seen that this has already been mentioned.
p1esk said:
Yes, no noise when the flow starts, but a bang when the flow stops. In my experience it can be caused if the supply pipe is not adequately supported. What seems to happen is that when the flow stops abruptly the pressure rises very suddenly and caused the pipe to move and bang against some adjacent object such as a floor, joist or wall etc.
If this is the cause, arranging a better support for the section of pipe is the best answer.
You can also get a little device to fit into the pipework, which amounts to a small buffer vessel containing air. This provides a cushion which absorbs the shock by smoothing out the pressure rise that has been causing the problem....if you see what I mean.
This device, by the way, can be obtained from Screwfix - or was it Toolstation - I can't remember which, but I've seen them in the catalogue.
Sorry for the thread hijack but we have this problem when my wife turns the kitchen sink lever tap off suddenly (on the hot supply ).If this is the cause, arranging a better support for the section of pipe is the best answer.
You can also get a little device to fit into the pipework, which amounts to a small buffer vessel containing air. This provides a cushion which absorbs the shock by smoothing out the pressure rise that has been causing the problem....if you see what I mean.
This device, by the way, can be obtained from Screwfix - or was it Toolstation - I can't remember which, but I've seen them in the catalogue.
There's no way of finding where the pipe is poorly supported and so would fitting one of these devices near the kitchen sink help reduce the bang?
Elderly said:
p1esk said:
Yes, no noise when the flow starts, but a bang when the flow stops. In my experience it can be caused if the supply pipe is not adequately supported. What seems to happen is that when the flow stops abruptly the pressure rises very suddenly and caused the pipe to move and bang against some adjacent object such as a floor, joist or wall etc.
If this is the cause, arranging a better support for the section of pipe is the best answer.
You can also get a little device to fit into the pipework, which amounts to a small buffer vessel containing air. This provides a cushion which absorbs the shock by smoothing out the pressure rise that has been causing the problem....if you see what I mean.
This device, by the way, can be obtained from Screwfix - or was it Toolstation - I can't remember which, but I've seen them in the catalogue.
Sorry for the thread hijack but we have this problem when my wife turns the kitchen sink lever tap off suddenly (on the hot supply ).If this is the cause, arranging a better support for the section of pipe is the best answer.
You can also get a little device to fit into the pipework, which amounts to a small buffer vessel containing air. This provides a cushion which absorbs the shock by smoothing out the pressure rise that has been causing the problem....if you see what I mean.
This device, by the way, can be obtained from Screwfix - or was it Toolstation - I can't remember which, but I've seen them in the catalogue.
There's no way of finding where the pipe is poorly supported and so would fitting one of these devices near the kitchen sink help reduce the bang?
I have no experience of using them, but I would expect that fitting an 'air bottle' type of device should reduce or even eliminate your problem. It's well worth a try.
Our pipes in the kitchen bang when turned on and off (if done quickly) because they aren't supported properly. I know this because I fitted them, and it was one of those "oh I'll just get it up there and sort it properly another day" and never did...
Be interesting to know how the support you've had for however many years is no longer sufficient - at least I know mine was crap from day one!
Be interesting to know how the support you've had for however many years is no longer sufficient - at least I know mine was crap from day one!
It occurs on heavy draw of water (especially the washing machine).
I do get a little knock on turning off, but I know this is because the pipe clips under the landing have died and need to be re-done. This would necessitate the carpet being re-laid and I'm not going to do that around Christmas.
My mate reckons something has failed. I'm going to try and have a look tomorrow.
Anyone know how to isolate taps in the corner of a bath (1/4 lever turn) and how to test a toilet valve?
I do get a little knock on turning off, but I know this is because the pipe clips under the landing have died and need to be re-done. This would necessitate the carpet being re-laid and I'm not going to do that around Christmas.
My mate reckons something has failed. I'm going to try and have a look tomorrow.
Anyone know how to isolate taps in the corner of a bath (1/4 lever turn) and how to test a toilet valve?
Edited by Wildfire on Tuesday 21st November 12:27
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