Any such thing as in-place pipe dope?

[Speedy Jim]

L/R couplings are in use today and trace origins to the very earliest days.

[Larry W]

Better stick to locksmithing, you don't know something til you KNOW it.

[BobK207]

[Steve Barker]

Well I stand corrected then. That's the most ridiculous thing I've ever heard of. When a union would be so much better, why would you bother with searching out and procuring and using a morphidite like that?

[Steve Barker]

If it weren't accessible, you wouldn't be able to install the L/R......

[Edwin Pawlowski]

The term "accessible" has a slightly different use in building. Anything is accessible with the right hammer, but normally, hidden joint between walls, under floors, etc cannot be joined with a union. It may be accessible during construction, but not after the room is finished.

[Steve Barker]

Well, I can't imagine there being a use for the L/R system in new construction. It would be only in a repair. And if that is the case, you'd just take it apart at the "accessible" union, and take apart backwards to the problem area.

[Edwin Pawlowski]

Right about the new construction, but in the case of a repair, it can still be a very long run, with many turns, to the union. Why break 15 joints if you can break three and get the job done?

[Larry W]

They probably do find their widest use in repairs, whatever the case, there is sufficient demand for them that the manufacturers continue to produce them and supply them at resonable prices.

To the OP, if you decide to use one of these make sure that all the other threaded fittings on both sieds are tight beforehand, and use a long pipe wrench on the LH thread side to keep from loosening any exisiting joints. As you tighten the repair fitting it will want to loosen any RH threaded joints connected in line with the LH thread repair fitting.

[Michael B]

[Steve Barker]

I hear ya.

[John Gilmer]

Gas lines aren't under much pressure. I suspect that the "right stuff" cold seal it even without turning off the gas. If you could turn off the gas even chewing gum might work.

If you could draw a slight vacuum ...

[John Gilmer]

That's not quite true.

The pipe dope permits elbows to be positioned at any position in that "last turn" without leakage.

[harleyron]

A question on sealing gas pipe was posted and to this I say:

Of course ,if you can weld, black pipe is the easiest stuff to weld you ever saw. Arc,mig,tig even oxy/acetylene will do nicely. Welded gas line is common in europe.

H.R.