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Country Discussion Topics
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Size of copper tube/pipe
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screaminghollow    Posted 12-10-2004 at 13:02:43       [Reply]  [No Email]
I've got to tie in a hot water heat line in my basement, but the darn copper line there is a huge size. I measured the outside diameter of the pipe, 1.37 inches. Is that one and a quarter inch copper pipe? is it even plumbing pipe? (I found another place where an odd narrow size pipe was used in another area of the basement, it was a metric size)

screaminghollow -- thanks    Posted 12-10-2004 at 20:07:39       [Reply]  [No Email]
The pipe/tube comes directly out of the boiler and does get ferociously hot. I remembered that last year I represented a steam fitter in a small matter and called him. It is 1&1/4 copper. The stuff in the other side of the basement measures exactly 11mm. larger than 3/8 smaller than half. From what I've been told, water pipe is always measured by inside diameter, gas tube and pipe by exterior diameter.
Now I need three valves, a "t" and two adapters to 1 inch pex.

Bill WI    Posted 12-10-2004 at 18:52:47       [Reply]  [Send Email]
Sure that's 1 3/8 tube. It may be a thirty some or sixty some thousandths wall. Go by OD. Go to a plumbing supply shop and they'll have a reducing T to bring you down to 3/4. Granted you won't find this in the average hardware store. Takes awhile with a propane torch to get the heat to sweat it though or if you have the chance use a bigger torch. Also check on use of dielectric unions to save joints from corroding on copper to dissimilar metals in the system. Aren't that expensive and readilly available. They are just brass 3/4 unions that use a plastic gasket to issolate against the iron or mainly galvinized. 1/8 and 1/4 aren't metric they are just big for the size. I think they did it just so we'd have to return fittings to the store. lol Bill

bill b va    Posted 12-10-2004 at 13:51:56       [Reply]  [No Email]

as crazy as it sounds i think you need to determine if you have copper tubing or copper pipe they are not the same . tubing is measured across outside diameter . copper pipe is measured across the inside diameter (nominal) . common plumbing uses copper pipe . refregiation ,aircraft and others use copper tubing . this can also apply to steel .boiler tubes are measured outside . so what you think is metric may not be metric

Ahh Hang On    Posted 12-10-2004 at 13:30:45       [Reply]  [No Email]
Make sure that is not a gas line. My hot water copper lines are 3/4". My cold water copper lines are 1/2". My copper gas lines are 1 1/4" (aka 1.25").

Your 1.37" line sounds unusual for a water line unless you need hot water in a seriously large volume.

Trace the biggie line back to another connection until you find the source to be certain it is a water line. Don't cut the line or torch it until you know for sure. We want you around to post on this board.

- Peanut

Pitch    Posted 12-10-2004 at 15:07:20       [Reply]  [No Email]
By anychance does your hotwater system tie into a hotwater baseboard boiler? A Boiler will have 1" or larger lines on it but anything over 3/4 is unusual for domestic water. I have never seen a copper domestic gas line like that either. Natural gas should be black pipe with a flexible copper right at the appliance and LP is usually soft copper.

Peanut    Posted 12-10-2004 at 15:13:59       [Reply]  [No Email]

My 1 1/4" copper is running thoughout the basement all coming from a black line coming into the house. I contracted my house so who knows what is correct in MO ... It passed inspection. But, my copper gas line is clearly marked all throughout the main-floor floor joists.

I only mentioned the gas line because of the unusual size for hot water being 1.37". I guess the easy way to test it is grab the pipe and feel how hot it is. LP is not hot (for darn good reasons).

I ran hot and cold water in my barn (about 120' of copper). The local "advisors" told me to stick with 1/2" and 3/4" for cold & hot. I did just that and it worked out fine.

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