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  #1   Report Post  
larry
 
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Default mains water pipe diameter - want a bigger one

I'm installing a heatbank / heat exchanger to get mains pressure on
all taps and showers in the house. But as far as I can see the mains
pipe coming in under the kitchen sink is just 15 mm. I need 22 mm.
What do I do - and what'll it cost ?

Cheers
larry
  #2   Report Post  
Christian McArdle
 
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Default mains water pipe diameter - want a bigger one

all taps and showers in the house. But as far as I can see the mains
pipe coming in under the kitchen sink is just 15 mm. I need 22 mm.


First actually test the flow rate. Under some conditions, 15mm can actually
give an adequete flow rate. If not, then the replacement will not be cheap.
Think in terms approaching four figures, especially if the route goes under
block paved driveways etc. You may be forced to have a water meter. However,
unless you use hosepipes and sprinklers, meters are likely to save you
money.

Also, you might want to check that the mains in your area are good enough.
In some cases, ancient Victorian mains are well undersized as requirements
and housing density has increased, and will have poor flow/pressure
characteristics themselves.

Christian.



  #3   Report Post  
Alex
 
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Default mains water pipe diameter - want a bigger one

It is normal for the water supply to be 15mm your side of the cock and 22 mm
on the water company side,so if that is the case it should not be to
difficult to change the supply to 22mm.


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nick smith
 
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Default mains water pipe diameter - want a bigger one


"Alex" wrote in message
...
It is normal for the water supply to be 15mm your side of the cock and 22 mm
on the water company side,so if that is the case it should not be to
difficult to change the supply to 22mm.


The recent splitting from the neighbours supply which was shared from a single
approx 15mm / half inch steel pipe off the 3" main in the road, and we had to go on a
meter
the board plumbed it all the way in 25mm Blue plastic pipe, which I continued in same size
into the house and then on in 22mm copper. the Bath taps jointly give a flow rate of 44
litres
a minute and the shower around 15 to 20 litres a minute depending on summer or winter.
Fan-blinking-tastic shower I can assure you !

Nick


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Kalico
 
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Default mains water pipe diameter - want a bigger one

"Christian McArdle" wrote in message
. net...
all taps and showers in the house. But as far as I can see the mains
pipe coming in under the kitchen sink is just 15 mm. I need 22 mm.


First actually test the flow rate. Under some conditions, 15mm can

actually
give an adequete flow rate. If not, then the replacement will not be

cheap.
Think in terms approaching four figures, especially if the route goes

under
block paved driveways etc. You may be forced to have a water meter.

However,
unless you use hosepipes and sprinklers, meters are likely to save you
money.

Also, you might want to check that the mains in your area are good enough.
In some cases, ancient Victorian mains are well undersized as requirements
and housing density has increased, and will have poor flow/pressure
characteristics themselves.

Christian.


If you do some of the work yourself then there is no reason it should cost
so much. Prices only really start to rise if you have to dig up a concrete
kitchen floor, for example.

I bought a roll of 25mm MDPE blue pipe from my local merchants, dug up the
front garden and drilled a big hole through the front of the house to get
the pipe through to the sub-floor space. Be sure to sleeve the 25 mm in
28mm or 32mm plastic waste where it passes through the brick.

Then I called the water company to come and connect it which they did for
free considering I was replacing lead. They also connected me into my own
68mm main in the street so now the pressure could blow you out of the bath.
Actually, I have to reduce the pressure but it will be useful if I ever need
to do some crowd control. hehe!

From the 25mm MDPE go to 22mm copper.

HTH
Rob

--
Tel. 07010 703 702

Replace SPAM with ORG to reply





  #6   Report Post  
Lobster
 
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Default mains water pipe diameter - want a bigger one

"Kalico" wrote in message news:Myu%b.13283$Y%

I bought a roll of 25mm MDPE blue pipe from my local merchants, dug up the
front garden and drilled a big hole through the front of the house to get
the pipe through to the sub-floor space. Be sure to sleeve the 25 mm in
28mm or 32mm plastic waste where it passes through the brick.


As it happens I need to do this myself soon; and have been scratching
my head over the specs diagram I've just received from the water co.
It shows the MDPE pipe coming through the wall, minimum 750mm below
ground, sheathed in another pipe as you describe. However, it
stipulates that the min radius of the sheathed pipe is 750 mm! ie, as
drawn, it must come up through the kitchen floor at least 750mm from
the outside wall! This bears no resemblance to any installation I've
ever seen, and makes no sense to me at all. Can anyone shed some
light on this???

David
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G&M
 
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Default mains water pipe diameter - want a bigger one


"Lobster" wrote in message
om...
"Kalico" wrote in message news:Myu%b.13283$Y%

I bought a roll of 25mm MDPE blue pipe from my local merchants, dug up

the
front garden and drilled a big hole through the front of the house to

get
the pipe through to the sub-floor space. Be sure to sleeve the 25 mm in
28mm or 32mm plastic waste where it passes through the brick.


As it happens I need to do this myself soon; and have been scratching
my head over the specs diagram I've just received from the water co.
It shows the MDPE pipe coming through the wall, minimum 750mm below
ground, sheathed in another pipe as you describe. However, it
stipulates that the min radius of the sheathed pipe is 750 mm! ie, as
drawn, it must come up through the kitchen floor at least 750mm from
the outside wall! This bears no resemblance to any installation I've
ever seen, and makes no sense to me at all. Can anyone shed some
light on this???


The 750mm is only enforceable if you don't insulate the pipe. Put some
insulation around it and you are allowed to go up to the surface provided
you guard it against breakage.


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Toby
 
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Default mains water pipe diameter - want a bigger one

Lobster wrote:
As it happens I need to do this myself soon; and have been scratching
my head over the specs diagram I've just received from the water co.
It shows the MDPE pipe coming through the wall, minimum 750mm below
ground, sheathed in another pipe as you describe. However, it
stipulates that the min radius of the sheathed pipe is 750 mm! ie, as
drawn, it must come up through the kitchen floor at least 750mm from
the outside wall! This bears no resemblance to any installation I've
ever seen, and makes no sense to me at all. Can anyone shed some
light on this???


The pipe is not that bendy but will go much tighter than a 750mm radius. Try
a piece, it's quite obvious where the kink point starts.
The water contractors won't be that bothered so it really is up to you how
you route the pipe within your property. Make sure it is all loose when they
turn up so they can feed it into the outside stopcock easily.

You could fit a 90 bend after it enters the wall or start the bend further
out so that it enters the wall already at an incline.
The sheathing pipe can be anything handy, an offcut of basin waste or cable
duct and is only needed for the bit actually in the wall.

My contractors thought my (exactly to spec) deep trench quite funny as the
main was only 400mm deep in the street.

--
Toby.

'One day son, all this will be finished'


  #9   Report Post  
Kalico
 
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Default mains water pipe diameter - want a bigger one

"Lobster" wrote in message
om...
"Kalico" wrote in message news:Myu%b.13283$Y%

I bought a roll of 25mm MDPE blue pipe from my local merchants, dug up

the
front garden and drilled a big hole through the front of the house to

get
the pipe through to the sub-floor space. Be sure to sleeve the 25 mm in
28mm or 32mm plastic waste where it passes through the brick.


As it happens I need to do this myself soon; and have been scratching
my head over the specs diagram I've just received from the water co.
It shows the MDPE pipe coming through the wall, minimum 750mm below
ground, sheathed in another pipe as you describe. However, it
stipulates that the min radius of the sheathed pipe is 750 mm! ie, as
drawn, it must come up through the kitchen floor at least 750mm from
the outside wall! This bears no resemblance to any installation I've
ever seen, and makes no sense to me at all. Can anyone shed some
light on this???

David


750mm! Forget it. There is not one of my properties that complies with
that.

Like all things DIY, when working on ones own property, you will be far more
cautious/careful than any 'approved' installer. When I suggested the
sheathing to the guys that turned up to do the connection they just laughed
at me. Seriously!

Everyone I have spoken with has said that MDPE is stronger than it looks and
not to be too concerned with scratching it or compressing it etc. Of
course, wanting to do the job properly, I ignored them all and took care of
what I did, running it under the (to be installed) concrete floor within an
electrician's 50mm conduit which was available with a nice radius bend that
brought it vertical to my kitchen wall without having to sink 750mm down. I
also used this to run a few cables along, which was helpful.

Frankly, ignore the 750mm spec and do what you feel is correct. The guys
who come to acutally connect the thing in the road will know a fraction of
what you do.

HTH
Rob

--
Tel. 07010 703 702

Replace SPAM with ORG to reply



  #10   Report Post  
Rick Dipper
 
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Default mains water pipe diameter - want a bigger one

On Thu, 26 Feb 2004 13:40:06 -0000, "Christian McArdle" wrote:
all taps and showers in the house. But as far as I can see the mains
pipe coming in under the kitchen sink is just 15 mm. I need 22 mm.


First actually test the flow rate. Under some conditions, 15mm can actually
give an adequete flow rate. If not, then the replacement will not be cheap.
Think in terms approaching four figures, especially if the route goes under
block paved driveways etc. You may be forced to have a water meter. However,
unless you use hosepipes and sprinklers, meters are likely to save you
money.

Also, you might want to check that the mains in your area are good enough.
In some cases, ancient Victorian mains are well undersized as requirements
and housing density has increased, and will have poor flow/pressure
characteristics themselves.

You may like to go under the floor amd check if someone put a MDPE to 15mm convertr in, that you can swap to a 22mm.

Rick


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