RE: [OT] : New water mains fitted... can I use MDPE pipe ineternally ?

["Neil Ball" <neilball@xxxxxxxxxxxxxxx>]

For the water hammer problem, if you cannot find/fix the offending
pipework
that could be moving around you could fit a shock arrester which may help =
=96
these are simply fitted into the pipework at a suitable point, see
http://www.besltd.net/products/109.asp
for a typical unit.

=20

Regarding the internal pipework then why not use some proper internal
plastic plumbing designed for use with push-fit fittings rather than blue
MDPE? 25m will cost around =A345 plus some fittings for either end and
stil=
l
give you a single continuous length of pipe from A to B. With any plastic
pipe you need to make sure it gets sleeved/protected when pulled through
an=
y
walls if at all possible, any nicks or scrapes on the pipe can weaken it
an=
d
you don=92t want it to fail once it is all in place!=20

=20

=20

_____=20=20

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Marcus Warrington
Sent: 18 June 2007 14:40
To: ukha_d@xxxxxxx
Subject: [ukha_d] [OT] : New water mains fitted... can I use MDPE pipe
ineternally ?

=20

Sorry to be off topic but I know a lot of people are on the self build list
as well, so I thought I might get a quick answer to my question.

We've just had a new water mains fitted into our property to replace the
ol=
d
lead mains. We are currently waiting for the "water board" to
come and
inspect and commission it. The new mains comes into the property in the
opposite cellar and I will need to join it up to the old pipe work when the
switch over. I want to take the opportunity to convert the main feed to
22m=
m
instead of the 15mm feed at present. At the moment we have a load bang
whenever a tap is shutoff or the washing machines fills. From what I've
rea=
d
this is either a banging pipe (which I've been unable to find) or
"water
hammer". Research on the net seems to say that using a larger pipe
will
reduce the water velocity in the pipe and help reduce/prevent the water
hammer effect.

The mains enters the house in blue MDPE pipe which the has a compression
fitting 25mm to 15mm stop tap fitted. I have a run of about 25meters from
this new tap to the upstairs point where the water mains splits into two
(one way being supply for Utility and kitchen, the other is the supply for
bathroom and shower room). Looking at the price of copper its going to cost
me in the region of =A3100 just in pipe to do that run, so I'm thinking..
i=
s
it acceptable to simply change the stop tap to 25mm-25mm and then run a 25m
length of blue MDPE pipe internally to this point ? I'm sure that's what
th=
e
builders did in our last house, but don't want to spend the =A340 and time
=
and
effort just to find that the "water board" then refuse to connect
it.

Just to bring it slightly on topic, this pipe will be running across the
ceiling of the old larder cupboards which will start becomeing my node0 as
soon as this work is completed :-)

Thanks,

Marcus=20

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=20



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