Imperial compression fitting

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.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 27/01/2018 18:41, GB wrote:

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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 27/01/2018 19:54, Steve Walker wrote:

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).
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sun, 28 Jan 2018 13:16:36 +0000

That will be because I posted the wrong link. :-{ It should have been https://www.ebay.co.uk/itm/251462281794
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 29/01/2018 01:58, Rob Morley wrote:

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!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Mon, 29 Jan 2018 09:42:43 +0000

The sneaky git.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sat, 27 Jan 2018 18:41:06 +0000

This do? https://www.ebay.co.uk/itm/121387297629
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 27/01/2018 18:41, GB wrote:

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 admac myzen co uk

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.