"Dave P" wrote in message
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"IMM" wrote in message
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"Dave P" wrote in message
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"IMM" wrote in message
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"Dave P" wrote in message
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Whenever I turn off any tap (H or C) in my house, there is an
almighty
bang
as the water shuts off unless I do it v-e-r-y slowly indeed. Is
this
known
as 'water hammer', or is that just the 'juddering' sound some folk
experience?

I've been googling about this here, but am nor sure how to cure
this
easily?

Sometime if a tap washer is lose this can occur. Check the washers
and
replace to suit. They are so cheap you may as well replace all of
them.

I don't want to close the stop cock or any in-line valves to
reduce
the
pressure, as it's really not that great anyway (and I have a combi
feeding
the shower - the whole place has mains pressure water, no H or C
tanks).

Is an 'arrestor' what I need, or is that just for juddering pipes?
If
this
would do the trick, does it matter whereabouts it is fitted in the
system?

Thanks

Fit a shock arrestor from BES:
http://www.bes.ltd.uk

Fit as near to the offending tap as possible. This will fully
eliminate
the
problem.

Thanks for this - however it's ALL taps, so the shower, bath taps,
sink
taps, kitchen taps and washing machine all do this (therefore washers
unlikely to be the culprit, also all taps are brand new too). So
hopefully
I would't need 9 of them!? If I put these arrestors in the H & C
pipes
under the bath - therefore pretty close to bath/sink/shower, would
that
sort
out the kitchen (probably about 6m of pipework away)?

You only need one arrestor. In systems were there is no water meter,
expansion is taken up down the mains pipe. Some water meters have check
valves in them preventing this occurring. So, you have to install
expansion
provision yourself. They are small spheres.

Surely 1 arrestor for hot and one for cold? (I don't have a meter.)

In some cases when water meters have been installed the extra pressure
inside the installation can blow combi gaskets, shower joints and tap
joints. Some combi's come with arrestors already fitted, others have
provision.

Is the system a mains pressure system on H&C? What types of taps do you
have? 1/4 turn efforts?

Yes, fully mains pressure; yes, taps are the 1/4 turn ceramic disc types
(which no doubt exacerbates the problem I'll admit; although it also
happens
with the shower mixer which presumably has conventional rubber seals
inside).

The 1/4 turn don't help at all. Yes. I would put one sock arrestor on the
hot and one on the cold. They are about £10 each.