I need to solder relatively close to a copper-steel adapter that has pipe dope.
I will put the adapter on a copper extension outside the assembly and then twist it on with dope, but the extension is only about 3-4" because it needs to make a turn due to a tight space.
I can't mount the elbow outside the assembly because then I won't have space to turn it.
My concern is that, if I heat with MAPP gas that close to a threaded joint with dope, I will cook the dope off the joint, and then might introduce a leak.
It's 1/2" pipe on both copper and steel side.
How close to the threaded, doped joint is it safe to heat the copper in order to apply a sweat fitting?