Black iron pipe should cause no problem at all. Most black iron pipe though has a protective coating on it and I am not sure what it is. I do know when you heat the pipe, the coating has a sweet smell to it. If it has a coating on it, burn it off. A torch works great.
Here is a link to metel properties from the guys over at Integrated Publishing.
Kinda interesting and it covers most everything. The spark test comes in handy when your diggin through unknown metals. I dont think they would care for it inside the Depot!
http://www.tpub.com/content/construc...s/14250_13.htm
Jeff S
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