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

[Marcus Warrington <marcus.warrington@xxxxxxxxxx>]

Thanks Raymond.

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My pipe comes in to the cellar and then runs along the underside of the
sta=
ircase and then under the upstairs landing so no chance of any sunlight..
s=
o unless it looks like the way I'll do it.

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How are you securing the pipe.. i.e. I've not found any 25mm pipe clips
aro=
und.. are you just drilling through joists and feeding through the hole ?

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One other question.. are you planning to use the push fit connectors or
the=
compression type. The compression type are quite bulky but cheaper.

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Thanks

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Marcus=20

________________________________

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of R=
aymond Kelly
Sent: 18 June 2007 15:17
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] [OT] : New water mains fitted... can I use MDPE pipe
=
ineternally ?

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Thinking about the same and am on the SelfBuild List.
I've been looking at the screwfix forums - which are pretty good.
The general question is about the MDPE pipe - which ideally is an
underground pipe ie connects to the mains water in under your path/drive
then should be 750mm dug in trench and ideally when it comes up above
groun=
d
ideally change to copper. The actual rules etc are a bit vague but least to
say that the blue pipe should not be exposed to sunlight. What I am doing
i=
s
run a single pipe from the water connection to my main presentation within
the house in a single piece. Within the house its under the floorboards
&
insulated - till it gets to the presentation point at which point it has a
22mm copper connection.
When I spoke to the water board they did not seem to care what happens in
m=
y
property.

On 18/06/07, Marcus Warrington <marcus.warrington@xxxxxxx <mailto:marcus=
.warrington%40mis-es.com> > wrote:
>
> 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
> old lead mains. We are currently waiting for the "water
board" to come an=
d
> 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 t=
he
> switch over. I want to take the opportunity to convert the main feed
to 2=
2mm
> 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 r=
ead
> 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
fo=
r
> bathroom and shower room). Looking at the price of copper its going to
co=
st
> me in the region of =A3100 just in pipe to do that run, so I'm
thinking..=
is
> it acceptable to simply change the stop tap to 25mm-25mm and then run
a 2=
5m
> length of blue MDPE pipe internally to this point ? I'm sure that's
what =
the
> builders did in our last house, but don't want to spend the =A340 and
tim=
e 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 a=
s
> soon as this work is completed :-)
>
> Thanks,
>
> Marcus
>
> [Non-text portions of this message have been removed]
>
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>

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