Cutting natural gas pipe

Reply

  #1  
Old 12-10-17, 01:53 PM
B
Member
Thread Starter
Join Date: Oct 2001
Location: USA
Posts: 965
Received 4 Votes on 4 Posts
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  
Old 12-10-17, 02:18 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 61,398
Received 1,399 Votes on 1,296 Posts
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.
 
  #3  
Old 12-10-17, 03:24 PM
B
Member
Thread Starter
Join Date: Oct 2001
Location: USA
Posts: 965
Received 4 Votes on 4 Posts
Thanks for the help! Saves me a lot of work.
 
  #4  
Old 12-11-17, 07:54 AM
G
Member
Join Date: Nov 2007
Location: MI
Posts: 2,634
Received 1 Vote on 1 Post
So the gas standing in the pipe won't ignite from the sparks?
 
  #5  
Old 12-11-17, 11:02 AM
Z
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 5,658
Received 173 Votes on 154 Posts
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.
 
  #6  
Old 12-11-17, 11:54 AM
B
Member
Thread Starter
Join Date: Oct 2001
Location: USA
Posts: 965
Received 4 Votes on 4 Posts
One final question and I hope I can leave you alone. Is there any problem mixing black iron pipe and galvanized elbows?
 
  #7  
Old 12-11-17, 04:10 PM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 9,715
Received 313 Votes on 282 Posts
Is there any problem mixing black iron pipe and galvanized elbows?
Depends on who you talk to. Some in this forum say it's not a good idea because flakes of galvanizing will fall off and clog gas jets. I suppose that it's possible, but very unlikely. Years back I called the gas company and asked if I can mix black iron and galv pipe. They told other than cost , there is no problem. I've done it and have had no problem. There is no corrosion or bad effect with galvanized pipe being used on gas service. But it is costly.
 
  #8  
Old 12-12-17, 10:05 AM
B
Member
Thread Starter
Join Date: Oct 2001
Location: USA
Posts: 965
Received 4 Votes on 4 Posts
How about that. I cut the black iron with my angle grinder and nothing blew up!! Thanks for the help. Life is good.
 
  #9  
Old 03-21-18, 10:30 PM
C
Member
Join Date: May 2016
Location: USA
Posts: 3
Received 0 Votes on 0 Posts
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 ...
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: