On 9 Oct, 16:38, fred wrote:
In article , F
news@nowhere.? writes
After listening to water hammer on the pipes for the last 30 years I've
finally got round to doing something about it (best not to rush these
things) and fitted an arrestor -
http://www.toolstation.com/shop/Plum...+Shock+Arresto...
BSP/d/sd/p93058
I've had most of the plumbing in the house exposed at some time or other
but have never been able to find the source of the problem. Only a
couple of 3M or 4M stretches have never been able to be checked so I
fitted it in a section as close to what I presumed to be the source of
the hammer as possible.
It's not worked. Nothing has changed.
Do the arrestors work (if they're going to) as soon as they are fitted?
The top of it has what looks like a bicycle pump connector. Do I need to
get some pressure into it?
TIA
I agree it's best not to rush these things.
I assume by water hammer you mean banging in the pipes when a tap is
turned off sharply?
It's handy to understand that this kind of water hammer is about shock
waves travelling along a pipe when a flow is interrupted and making a
bang when the shock hits a restriction in the pipework, whether that be
the incoming stop-cock, a narrowing in pipework or if really unlucky, a
side limb of a T joint.
That said, it's common for water hammer to be solved by simply fixing
down the pipes in a system securely so that they can't jump about when a
pressure wave is passing through them. That is certainly the case when
it is a vibration in pipes when the pipes are on rather than a bang when
they are turned off. Try this first.
The device you linked to is a typical one and they are ready to use out
of the box so no need to pump them up, and as they have such a low
volume you could easily empty them by just trying to measure the
pressure so best left alone.
They can be a bit hit or miss but they are generally best placed to
catch the shock wave at the opposite end of the pipework from the source
as that is where the sharpest shock is. If you've placed it at the end
of a branch then I'm afraid it's probably the wrong place. I would first
place one of these as close as possible to the incoming stop-cock.
See also:http://wiki.diyfaq.org.uk/index.php?title=Noisy_Pipes
--
fred
BBC3, ITV2/3/4, channels going to the DOGs
...