[Shop-talk] need some copper plumbing help from the gurus

[Pat Horne]

John, I don’t recall having trouble with old tubing/pipe & new fittings. 

 

I just looked up the O.D. of ¾” pipe & tubing for water & it shows to be 1/8” larger than what the pipe is called, so that would be 0.825”. 

 

There is another system of copper tubing intended for A/C use. The diameters for this tubing is the same as the call size, so 7/8” tubing would measure 0.875”. 

 

I don’t have access to detailed metric charts but it seems that the call size in MM is the same as the external diameter. 0.9” is just under 23MM, but I don’t see that there is an actual 23MM tubing on the market.

 

If it is possible that the pipe was full of water & froze, the pipe could have expanded that 0.025” I’ve had that happen when I was in Denver decades ago.

 

I don’t know what you have, but with only about 0.025” that the fitting would need to be stretched, you might be able to do that with a swaging tool, or make something that will do the job.

 

You might want to check with an old plumber to see what he/she knows.

 

Are there any markings or brand on the cap you cut off?

 

Where are you located?

 

Good luck.

 

Peace,

Pat

 

From: Shop-talk [mailto:shop-talk-bounces at autox.team.net] On Behalf Of john niolon
Sent: Saturday, October 20, 2018 12:08 PM
To: shop-talk
Subject: [Shop-talk] need some copper plumbing help from the gurus

 

When we built my house/shop 25 years ago I had the plumber install a 3/4” water line to the shop and cap it off.  I was going to put in the sink and the outside faucet when I got time.  Well,  this week I got time

 

I cut the cap off and test fitted a 3/4” Tee to start dry fitting the plumbing for sink/faucet.  The Tee wouldn’t fit on the tubing.  I cleaned it well but the Tee was still too small to fit over the tubing.  It looks like he used coiled tubing, or at least that’s what’s coming up thru the concrete.  I tried several fittings and even cut the tubing lower to see if it was crimped or out of round...  it mic’d the same all the way around it in several places

 

I mic’d the tubing and the fitting and here’s the results

 

tubing i.d. is  .882” which is just over 7/8”

tubing o.d. is  .900”  which is just under 29/32”

 

a new standard Tee i.d.is .876”   which ain’t gonna fit over .900

 

if I can find one fitting to get this to standard 3/4” size I’m good to go...

 

did the old stuff differ from todays standard “

after researching fittings a little I see that there are several ‘types” of fittings.... from plumbing to hvac to whatever...

 

anyone wanna try and give me some guidance here... the net is confusing and offers little on actual dimensions


thanks

john

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