Hello all
I know most regulars here will be bored to death with questions like
this but despite a search I cannot find any questions/ answers to fit
my problem.
There is a banging/knocking noise coming from my hot and cold pipes
when absolutely nothing is turned on. It has been going on now for a
couple of months. It happens randomly and I cannot re-create it by
turning anything on or off. I was fitting a new bathroom suite and
towel radiator recently so had the supply turned off at the main
stopcock and had the CH (combi) drained but the noise was still there.
I just can't work this one out. Normally I would blame the neighbours
(semi detatched) but the noise sure sounds like it's coming from my
pipes.
Any suggestions welcome
TIA

acrabat@blueyonder.co.uk wrote:


> There is a banging/knocking noise coming from my hot and cold pipes
> when absolutely nothing is turned on.


Only experience I've had in this area was a bathroom tap.  I fitted a 
pressure regulator and a section of flexible pipe.  Don't know which one 
cured it, but it stopped.

I've installed a number of high pressure water pipe lines and as standard we 
would put in a 1 metre flexible every 50 metres or so to avoid water 
hammer - these were 200bar @ 30 litres/min.

Dave

On 31 Aug 2005 13:53:29 -0700, acrabat@blueyonder.co.uk muttered and
said:


>Hello all
>I know most regulars here will be bored to death with questions like
>this but despite a search I cannot find any questions/ answers to fit
>my problem.
>There is a banging/knocking noise coming from my hot and cold pipes
>when absolutely nothing is turned on. It has been going on now for a
>couple of months. It happens randomly and I cannot re-create it by
>turning anything on or off. I was fitting a new bathroom suite and
>towel radiator recently so had the supply turned off at the main
>stopcock and had the CH (combi) drained but the noise was still there.
>I just can't work this one out. Normally I would blame the neighbours
>(semi detatched) but the noise sure sounds like it's coming from my
>pipes.
>Any suggestions welcome
>TIA


"Kettling" in your boiler by it overheating.

Your water supply is shared with your neighbours closely and the water
bounce from bad plumbing in their side is coming into your house and
setting your plumbing off.

Or you have a "primatic" copper water tank and it is venting itself a
lot for some reason. (This makes one hell of a racket)

david lang  wrote:

> acrabat@blueyonder.co.uk wrote:
> 
>> There is a banging/knocking noise coming from my hot and cold pipes
>> when absolutely nothing is turned on.
> 
> Only experience I've had in this area was a bathroom tap.  I fitted a 
> pressure regulator and a section of flexible pipe.  Don't know which one 
> cured it, but it stopped.
> 
> I've installed a number of high pressure water pipe lines and as standard we 
> would put in a 1 metre flexible every 50 metres or so to avoid water 
> hammer - these were 200bar @ 30 litres/min.


That's one hell of a shower.

Ian Stirling wrote:

> david lang wrote:
>>I've installed a number of high pressure water pipe lines and as standard we 
>>would put in a 1 metre flexible every 50 metres or so to avoid water 
>>hammer - these were 200bar @ 30 litres/min.
> That's one hell of a shower.


It's what you need if you're running two combis

Owain

Ian Stirling wrote:


> That's one hell of a shower.


:-)

Just the sort of pressure washer you need to clean up after growing 
mushrooms or beansprouts commercially.

Dave