Cutting natural gas pipe
#1
12-10-17, 12:53 PM
Cutting natural gas pipe
Is it safe to cut a 1/2" black iron natural gas pipe with a sawzall or angle grinder once the gas main is shut off? It's a LOT of work disassembling "stuff" and then putting it back together if I have to unscrew the old piping. But I'll do it that way if I have to, to be safe.
#2
12-10-17, 01:18 PM
Group Moderator
Once the gas is shut off there is little to no residual gas pressure left. You could vent the pressure out thru a stove. Cutting the pipe is sometimes the only way to break in to the middle of a gas line.
#5
12-11-17, 10:02 AM
Nope, whatever gas is in the pipe will be bled by the water heater. I usually open the gas valve to the range to bleed off the little pressure that's in the system, but I'm sure it's not even necessary.
#7
12-11-17, 03:10 PM
Member
Is there any problem mixing black iron pipe and galvanized elbows?
#9
03-21-18, 09:30 PM
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Yes but just to be safe, once you close the gas main valve, just turn on the kitchen stove (assuming it's gas) for a few seconds to burn off whatever is in the line before you start. The only thing with using a Sawzall is, there could be some small sparks from cutting steel. If there's any material amount of gas in the line, that would be bad ...
