Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into that
which was so firm that I could not budge it. Sticking out of that was a
bit of 3/4" copper pipe with one end of a compression fitting, ie the
nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread is different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but quite
frankly I'll settle for whatever fits. The plumbing shop had very little
imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodness.

On 27/01/2018 18:41, GB wrote:

Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into that
which was so firm that I could not budge it. Sticking out of that was a
bit of 3/4" copper pipe with one end of a compression fitting, ie the
nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread isÂ* different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but quite
frankly I'll settle for whatever fits. The plumbing shop had very little
imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodne


If there is enough of a pipe stub, then cut off close to the olive,
otherwise, carefully remove the olive (using an olive puller or by
slitting not quite through with a Dremel and then twisting open with a
screwdriver in the slot). Remove the nut. You can then use a brand-new
22mm compression fitting with a new 3/4" olive.

SteveW

On Sat, 27 Jan 2018 18:41:06 +0000
GB wrote:

Dismantling some ancient piping, I got left with the hot and cold
feed in some old steel pipe. There was some sort of brass connector
into that which was so firm that I could not budge it. Sticking out
of that was a bit of 3/4" copper pipe with one end of a compression
fitting, ie the nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread is
different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but
quite frankly I'll settle for whatever fits. The plumbing shop had
very little imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodness.

This do? https://www.ebay.co.uk/itm/121387297629

GB wrote:

Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into that
which was so firm that I could not budge it. Sticking out of that was a
bit of 3/4" copper pipe with one end of a compression fitting, ie the
nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread is different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but quite
frankly I'll settle for whatever fits. The plumbing shop had very little
imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodness.

Is there room to cut the 3/4" copper pipe behind the olive and use a
22mm to 3/4" endfeed adaptor to attach some 22mm copper pipe? I am
sure such adapters still exist and are not enormously expensive.

Alternatively, get the brass fitting off the steel pipe (you can
cautiously saw the brass obliquely to the thread as long as you don't
get to the steel and this will weaken it enough to split it as you turn
it. Open it a bit with a screwdriver (old!) twisted in the cut if
necessary. Then clean up the steel thread and get a very standard
female 3/4" to 22mm compression connector fitting. (If the steel pipe
is not 3/4" then the relevant adapter is probably still available 7/8"
is rare but 1" is common.) The end of the pipe will almost certainly be
a taper thread. In the unlikely event it isn't getting a brass female
taper thread adapter is not impossible. You want at least one of them
to be tapered so you can seal the thread. I'd just use PTFE tap at
3/4" size, but other sealants are possible.
--

Roger Hayter

On 27/01/2018 18:41, GB wrote:

Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into that
which was so firm that I could not budge it.

Possibly they used jointing compound on it. Try a bit of heat from
blow-torch which may/will soften the compound or provide some expansion
to free the connection.



--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 27/01/2018 19:54, Steve Walker wrote:
On 27/01/2018 18:41, GB wrote:

Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into
that which was so firm that I could not budge it. Sticking out of that
was a bit of 3/4" copper pipe with one end of a compression fitting,
ie the nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread is
different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but quite
frankly I'll settle for whatever fits. The plumbing shop had very
little imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodne


If there is enough of a pipe stub, then cut off close to the olive,
otherwise, carefully remove the olive (using an olive puller or by
slitting not quite through with a Dremel and then twisting open with a
screwdriver in the slot). Remove the nut. You can then use a brand-new
22mm compression fitting with a new 3/4" olive.

SteveW



Thanks, Steve. I think this will work. I've done similar in the past. I
was fixated on the idea that the right type of fitting was out there
somewhere and I just had to track it down!

The other ideas are all good, also, thanks. Except for the link to ebay.
That's a male BSP. It won't work as there's nowhere for the bit of
copper pipe to go (and I think the thread is the wrong size, but not
certain).

On Sun, 28 Jan 2018 13:16:36 +0000
GB wrote:

The other ideas are all good, also, thanks. Except for the link to
ebay.

That will be because I posted the wrong link. :-{
It should have been https://www.ebay.co.uk/itm/251462281794

On 29/01/2018 01:58, Rob Morley wrote:
On Sun, 28 Jan 2018 13:16:36 +0000
GB wrote:

The other ideas are all good, also, thanks. Except for the link to
ebay.

That will be because I posted the wrong link. :-{
It should have been https://www.ebay.co.uk/itm/251462281794



My initial reaction was great, that's just what I need.

Then I read "please note that both nuts will say 22mm, which is the
thread that they are screwed on."

He's just selling a 22mm coupler with a 3/4" olive at an inflated price!

On Mon, 29 Jan 2018 09:42:43 +0000
GB wrote:

On 29/01/2018 01:58, Rob Morley wrote:
On Sun, 28 Jan 2018 13:16:36 +0000
GB wrote:

[...]

That will be because I posted the wrong link. :-{
It should have been https://www.ebay.co.uk/itm/251462281794



My initial reaction was great, that's just what I need.

Then I read "please note that both nuts will say 22mm, which is the
thread that they are screwed on."

He's just selling a 22mm coupler with a 3/4" olive at an inflated
price!

The sneaky git.