Check out these pictures -- any idea what could cause this type of corrosion? The pipe looks like it has 'craters' in it -- I tried to get an up-close picture. These gas pipes are in a basement ceiling.
I know some surface rust on black iron pipe is to be expected -- but this one seems to be a candidate for replacement... thoughts?
http://lh4.ggpht.com/_DITuYNRLOW4/TT...0/IMG_2219.JPG
http://lh3.ggpht.com/_DITuYNRLOW4/TT...0/IMG_2218.JPG