what do I call this?

Big Will

There are four of them and two are leaking. 3" black iron pipe. Over 50 years old so great longevity. Dont know what to call it and neither does my vendor.

Unknown

Pics????

Can we see this?

Big Will

pic

I think I did it right this time

Big Will

got it

now you can see this

TonyS

Dresser coupling

its a compression coupling for steel pipe

MikeyB

Expansion Joint

Looks like a Steam Expansion joint. Is this on a steam or hot water riser?

Charlie from wmass

a cobb job is what I would call it.

looks like it has been leaking for awhile now. Dresser coupling would be what I would call it too. It may be there as an expansion joint. Looks like time to break out the gear reduction heads and thread some new pipe.

Unknown

a cobb job?

Whatever it is, 50 yr. longevity is not too shabby!

Looks like the leaking is caused by the piping itself corroding on the outside.

Big Will

This is kinda funny

This fitting has no leak. The leaker is another riser room. I would like to know about the gear reduction head. I would have no choice but to thread in place. i have never seen a threader that would do that in such a tight spot. The two 3" lines are only about two inches apart. finally its hot water not steam. I brought the pic into the vender and he recognized it. 

Charlie from wmass

Sorry with it being 3" I thought it was steam.

I would say with 2 inches clearance no getting to threader in there. I would say 6" minimum clearance. The dresser coupling should be fine to go and get a new one and cut back to the good pipe.

Alan (California Radiant) Forbes

Victaulic

I'd look into using Victaulic couplings and hire a fire sprinkler contractor to do the work.  They would need to cut out a 1-2 foot piece of pipe, cut-groove or roll-groove the two ends, fit a nipple in between and couple it together.



If the dresser coupling is intended as an expansion joint, then the nipple needs to be replaced by a grooved expansion piece which is made of braided stainless steel.