If it were a no pressure system like a sewer, I'd suggest take the bad
section out and use Fernco couplers.
http://www.hy-techroofdrains.com/images/drn-fer1000.jpg

I don't know if one of these would take the pressure and temperature
of a heat system. 15 PSI and 190F is a bit much for a rubber coupler.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"Dave" wrote in message
...
I have a leaking steel pipe that supplies warm water to radiators in
my house.

A plumber dropped by and said it would be easiest to cut the bad part
away and
weld a replacement. The pipe is about 2 inches thick.

The replacement is about two feet.

The plumber gave me a quote of about $2000 which I promptly refused.

What about using a fiberglass or something else? I'd rather just cut
the cracked
steelpipe part away and weld a copper replacement part. Any ideas?