What kind Pipe?

JM_2

Should i use whae adding a "T" for a Flush valve on my steam return lines, "Black Pipe" or "Galvinized Steel" and why. These are the only options avail at my home center.

JM

Jim Greco_2

Black pipe should be used since galvanized can flake into the steam system and react with the hi-temp steam causing clogs in the air valves. It usually flakes due to the expansion and contraction of the pipe during the steam cycle.

-JLG