Stopping water hammer... how to?
Discussion
Lovely side affect of the massive burst mains in SW London a few weeks ago and losing all water pressure is that the system seems to have now developed a water hammer when the toilet is flushed.
I want rid of it before any damaged is caused.
The hammer is subdued if the cold tap is left running in the bathroom when the toilet is flushed.
Its victorian flat... toilet has an enclosed cistern (really do not want to take it apart again for the 2nd time in 6 months) and the plumbing is probably from the 80/90s.
Anyone think of what I can do?
Heard people talk of of putting an arrester in there, but where? can this be placed near the boiler or will it need to be near the toilet? Will it actually solve it?
Also it could be the toilet flush valve clogged with sand/grit from the recent mains blow out.
Advice would be grateful.
I want rid of it before any damaged is caused.
The hammer is subdued if the cold tap is left running in the bathroom when the toilet is flushed.
Its victorian flat... toilet has an enclosed cistern (really do not want to take it apart again for the 2nd time in 6 months) and the plumbing is probably from the 80/90s.
Anyone think of what I can do?
Heard people talk of of putting an arrester in there, but where? can this be placed near the boiler or will it need to be near the toilet? Will it actually solve it?
Also it could be the toilet flush valve clogged with sand/grit from the recent mains blow out.
Advice would be grateful.
Closing the stop cock will not reduce the pressure, just reduce the flow rate.
The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
Neil - YVM said:
Closing the stop cock will not reduce the pressure, just reduce the flow rate.
The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
Is it a difficult job? Or should I just stump up for a plumber to come round and fix the thing with a £20 kit?The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
Being the cistern is an enclosed one in a wall? It does have silicon sealant cut out sections at my request (last one grouted everything in making it a bastid to get off)...
What kind of ball park figure would I be looking at to get this done?
would it not be worth purging the air by doing something like this... no cost option
http://www.dummies.com/how-to/content/how-to-quiet...
http://www.dummies.com/how-to/content/how-to-quiet...
Du1point8 said:
Neil - YVM said:
Closing the stop cock will not reduce the pressure, just reduce the flow rate.
The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
Is it a difficult job? Or should I just stump up for a plumber to come round and fix the thing with a £20 kit?The most likely cause is the wc filling valve, so either change / clean it. or if there is a ball valve servicing it, reducing the flow to it may stop the problem. Filling valves are cheap, so I would just replace.
You could fit an arrester, but almost certainly the valve is the cause.
Being the cistern is an enclosed one in a wall? It does have silicon sealant cut out sections at my request (last one grouted everything in making it a bastid to get off)...
What kind of ball park figure would I be looking at to get this done?
Reducing the flow rate may help the banging too (it certainly improved things with our mains pressure taps (two sinks) and header tank.
If I remember correctly, putting a restriction in a pipe will reduce the pressure if fluid is flowing in an open system (eg when the toilet valve is open). This is how most flow meters used to work - put an orifice plate in the pipeline and a "DP cell" is connected to each side. "DP" meaning Differential Pressure". Mind you, they were a PITA as the area of the hole is part of the calculation to convert the pressure difference to flow rate and that means a square root is in the calculations!
If I remember correctly, putting a restriction in a pipe will reduce the pressure if fluid is flowing in an open system (eg when the toilet valve is open). This is how most flow meters used to work - put an orifice plate in the pipeline and a "DP cell" is connected to each side. "DP" meaning Differential Pressure". Mind you, they were a PITA as the area of the hole is part of the calculation to convert the pressure difference to flow rate and that means a square root is in the calculations!
Du1point8 said:
Thing is I dont think we have high pressure according to the boiler pressure gague.
Will double check the OH is not playing with the f
king boiler again since I banned her from touching it last time.
If your boiler is a closed system then ignore that gauge, that's just the system pressure...Will double check the OH is not playing with the f
king boiler again since I banned her from touching it last time.McWigglebum4th said:
Is there a plumbing fitting with a screwhead in the middle going to the bog?
As this is a ball valve which could be tweaked to reduced flow
Carpet knife comes out tonight to start freeing the tiles to have a look before I lose patience with it and get the plumber out when I get back off holiday.As this is a ball valve which could be tweaked to reduced flow
Shaolin said:
Du1point8 said:
Is it a difficult job?
No, surprisingly easy and far less hassle than booking and arranging for someone to come and do it for you - assuming you are able to identify the working end of a spanner.My sympathy for a totally baffling situation.
Had the same problem and after endless research proved fruitless eventualy found it was due to the
ceramic disc valves in the kitchen mixer tap.
Took the cassettes apart to clean and refixed with coating of petroleum jelly and hammer stopped.
No idea why this should occur ,and hope it works for you.
regards
Had the same problem and after endless research proved fruitless eventualy found it was due to the
ceramic disc valves in the kitchen mixer tap.
Took the cassettes apart to clean and refixed with coating of petroleum jelly and hammer stopped.
No idea why this should occur ,and hope it works for you.
regards
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