I'm doing a bathroom/closet reno on the second floor of my home. In the process I discovered an old gas line (black steel pipe) that I believe is still active. I traced it back near the gas meter where this line is the 3rd of 3 coming off a main trunk line. I know how to turn off the gas at the meter. However because of the way the pipes are joined I think I'm going to have to cut out a section before I can unthread the line with wrenches.
How do I make sure that there is no gas in the line before I start cutting out a section? Any other tips?
Tracing backward from the line toward the meter, the connections I need to engage consist of line->elbow->double threaded male pipe ->female coupler. I want to get the line and elbow off and cap there.