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Pipe union nuts, olives & ends.

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RRMBK01/02/2012 10:38:36
154 forum posts
18 photos
Can anyone please point me in the direction of a table of the correct dimensions for the union nuts, end fittings and pipe olives etc for the various small pipe sizes that we use e.g 1/8, up to 3/8 .
I would also be interested in any articles on the manufacture of unions, union nuts, olives etc.
I have done a search through the indices but not come up with very much. ( probably my lack of understanding of search protocol!)
 
Many thanks
Brian K.
Colin Abrey01/02/2012 11:01:21
17 forum posts
2 photos
Brian,
 
There is an article in ME 15 Feb 1985 by N (Bill) Baily. He gives tables for the dimensions of the nuts & nipples for various pipe diameters.
 
Colin
RRMBK03/02/2012 18:45:25
154 forum posts
18 photos
Thank you very much indeed Colin, a very interesting article and provided me with just what I needed,
 
Kind regards
 
Brian K.
David Haynes04/02/2012 10:07:28
168 forum posts
26 photos
Are similar details also to be found in one of the reference books, such as by Tubal Cain or Harold Hall? If not, I can get the M.E. from my society if necessary.
Dave

Edited By David Haynes on 04/02/2012 11:58:57

RRMBK05/02/2012 01:54:12
154 forum posts
18 photos
They are not in Tubal Cain's Mod Eng handbook ( at least not in my ancient copy!) that was my first port of call as it is such a goldmine of information, Also I have "Screw Thread manual " by F.J.Camm of 1942 with over 40 pages of thread & screw tables but it does not list anything similar. I suspect the thread system has been created by someone ( LBSC?) matching the appropriate sized M.E 40 or 32 tpi thread to the pipe / Union diameter rather than by scaling something that exists in full size.
Brian K.
Stub Mandrel05/02/2012 19:37:08
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4315 forum posts
291 photos
1 articles
Somewhere I have a 1940s ME with a table of suggested sizes of unions for various sizes of pipe. I followed them and they work OK, if a little big. I made a taper bit just for the job.
 
Neil
Roger Best05/02/2022 20:34:04
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371 forum posts
56 photos

Did anyone find anything??

i will start a new thread.

R

Speedy Builder505/02/2022 20:45:50
2653 forum posts
219 photos

Buy a few fittings and measure them, however apart from a few specials, I usually buy the nuts and olives/ nipples.

Bob

HOWARDT05/02/2022 20:53:28
933 forum posts
39 photos

Fitting sizes
This is on the Super Simplex site. May be useful.

John Olsen05/02/2022 21:09:18
1256 forum posts
94 photos
1 articles

Here's a tip for anyone using commercial compression fittings on copper tube, which I guess would only be on larger locos, or on a steam launch like mine. They come with the wrong sort of olive, the ones meant for nylon tube, at least the ones I have bought generally did. It turns out these will sort of work on copper tube, at least for a while, but are likely to start leaking, usually in an awkward place to see. Of course I didn't know this at first!

The ones for nylon or plastic tube have a short taper on each end and then a step up to a larger diameter in the middle. The ones for copper have a longer taper at each end that meets in the middle.

If there is information in the 1940's ME about model size fittings, I probably have the issues here. I have some wartime ones, and a pretty complete collection from 1944 until covid started.

regards

John

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