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Joining metric to Imperial pipe.



 
 
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  #1  
Old August 31st 09, 10:28 AM posted to uk.d-i-y
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Posts: 28
Default Joining metric to Imperial pipe.

I want to join 15mm copper pipe to another pipe which is Imperial
polyethylene, Class C, low density to BS 1972/67, and installed around 1968.

This polyethylene pipe is of nominal size half inch, with an outside
diameter of 21.5mm, wall thickness a little under 3mm. It is black in
colour, and is to be used overground.

For the connector, will it be all right to use a metal (such as Kuterlite)
22mm to 15mm reducing fitting, with a three-quarter inch imperial copper
olive at the 22mm end going over the polyethylene pipe? I have a metal pipe
insert available that was left over from when the pipe was originally
installed in around 1968.


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  #2  
Old August 31st 09, 03:13 PM posted to uk.d-i-y
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Posts: 28
Default Joining metric to Imperial pipe.


"John Rumm" wrote in message
o.uk...
Anode wrote:
I want to join 15mm copper pipe to another pipe which is Imperial
polyethylene, Class C, low density to BS 1972/67, and installed around
1968.

This polyethylene pipe is of nominal size half inch, with an outside
diameter of 21.5mm, wall thickness a little under 3mm. It is black in
colour, and is to be used overground.

For the connector, will it be all right to use a metal (such as
Kuterlite) 22mm to 15mm reducing fitting, with a three-quarter inch
imperial copper olive at the 22mm end going over the polyethylene pipe? I
have a metal pipe insert available that was left over from when the pipe
was originally installed in around 1968.


Sounds like it ought to be ok. Failing that BES do transition fittings
that will mate with all sorts of pipe including lead. iron, plastic etc.,
and each one covers quite a range of sizes.

--
Cheers,

John.

Thanks John for your thoughts. I shall probably go ahead and see what
happens, as you think it may well be all right.

I have since discovered that Kuterlite list a fitting, K1710KP that is
marked Polyethylene to Copper,1/2 inch x 15mm, which seems to be made for
this job, but I have not yet found anyone who sells them singly. And the BES
fittings are a bit more bulky than the Kuterlite type and I have got limited
space to get the fitting in.

Regards,

Anode.


  #3  
Old August 31st 09, 05:55 PM posted to uk.d-i-y
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Posts: 2,490
Default Joining metric to Imperial pipe.

In an earlier contribution to this discussion,
Anode notvalid wrote:

I want to join 15mm copper pipe to another pipe which is Imperial
polyethylene, Class C, low density to BS 1972/67, and installed
around 1968.
This polyethylene pipe is of nominal size half inch, with an outside
diameter of 21.5mm, wall thickness a little under 3mm. It is black in
colour, and is to be used overground.

For the connector, will it be all right to use a metal (such as
Kuterlite) 22mm to 15mm reducing fitting, with a three-quarter inch
imperial copper olive at the 22mm end going over the polyethylene
pipe? I have a metal pipe insert available that was left over from
when the pipe was originally installed in around 1968.


It sounds like the stuff that supplies water to my house. ISTR that 3/4"
compression fittings are ok with it - so a 22mm fitting with a 3/4" olive
should be ok.
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!


  #4  
Old September 1st 09, 06:48 PM posted to uk.d-i-y
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Posts: 28
Default Joining metric to Imperial pipe.


"Anode" notvalid wrote in message
...
I want to join 15mm copper pipe to another pipe which is Imperial
polyethylene, Class C, low density to BS 1972/67, and installed around
1968.



John and Roger,

What has happened is I have eventually been able to find a local supplier of
that K1710KP fitting. It has a brass 15mm olive at the copper-connection
end, and a copper olive at the other end for the polyethylene-connection.
The nut at the polyethylene end has a finer thread than that at the
copper-connection end, and, so says a leaflet, is made of a copper alloy.

So it will make sense to use this specialist fitting now I have got it,
though whether the long-term end result will be noticeably different from
putting a 3/4inch olive in a standard fitting I do not know.

Thank you for your input.

Regards,

Anode.


  #5  
Old September 1st 09, 09:39 PM posted to uk.d-i-y
external usenet poster
 
Posts: 2,490
Default Joining metric to Imperial pipe.

In an earlier contribution to this discussion,
Anode notvalid wrote:

"Anode" notvalid wrote in message
...
I want to join 15mm copper pipe to another pipe which is Imperial
polyethylene, Class C, low density to BS 1972/67, and installed
around 1968.



John and Roger,

What has happened is I have eventually been able to find a local
supplier of that K1710KP fitting. It has a brass 15mm olive at the
copper-connection end, and a copper olive at the other end for the
polyethylene-connection. The nut at the polyethylene end has a finer
thread than that at the copper-connection end, and, so says a
leaflet, is made of a copper alloy.
So it will make sense to use this specialist fitting now I have got
it, though whether the long-term end result will be noticeably
different from putting a 3/4inch olive in a standard fitting I do not
know.
Thank you for your input.

Regards,

Anode.


Well, you obviously won't go wrong by using the proper thing!

On reflection, I can't be sure that that's not what I've got. It *looked*
like a 3/4" compression joint, but it could well have been a K1719KP or
equivalent. [It's buried deep under my sink, so I can't easily re-check].
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!


 




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