1st, I am NOT any sort of 'expert' with 'black' pipe.
2nd, that said what I would try is a soak with "Busty" [MY
favorite & not just because I sell it <G>], Kroil, PBBLaster
what-ever. SEVERAL time & FOAM it on so that it REALLY
WORKS !! Then using TWO [2] people pipe wrench on the
big pipe just to hold it from any sort of 'turning'. 2nd
pipe wrench [fitting 'looks' round ?!?] in the TIGHTEN
direction; give end of wrench a sharp but not to heavily
smack on the end. RE-SOAK with the penetrating fluid
[foam it on]. Go have cocktail/brew and then RE-soak.
Cocktail/brew and apply 2nd pipe-wrench to the 'nipple'
in the UN-do direction and give sharp rap to end of wrench.
REPEAT above several time until the 'nipple' begins to
turn easily.
Just do NOT rush the 'steps' above. The ONLY lose I
have had using this method in around 30 decades was a 3"
bolt that went thru a 2.5" aluminum 'spacer' on an
alternator install [original install] on a Chev. 350cid motor.
Dis-similar metals WON <VBG> !!!!
YMMV & FWIW & FYI & etc., etc., etc. !!
Ed
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