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Old 04-18-2008, 02:08 AM   #1
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Hey guys first timer, i am a frequeant reader of this forum. very informative . i am relocating a 1" gas line (black pipe) i am also reduceing to 3/4, can i cut out the 1" old pipe with a sawsoff, is this safe to do???
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Old 04-18-2008, 04:09 PM   #2
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Hi Lyndon:

As long as you know the gas has been shutoff properly then YES it is OK to cut gas pipe using a SAWZALL and sawzall blades (see pic.).

I do it every other day for over 26 years!! Just be sure to AIR test any work you do using a test guage made for gas work (reads in 1/10th PSI increments and guage does not exceed 5 PSI). Make sure all union connections to other appliances get taken apart and capped for testing of any work (excessive pressure can blow gas valves and even gas meters)

Air test should be at 3 PSI for 10 minutes IF have the right guage (cost is about $35.00-$40.00...available at all PLUMBING SUPPLY HOUSES).

Any questions, just let us know.
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Old 04-18-2008, 06:57 PM   #3
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thanks alot, WOW! my spelling is bad. my brain don't work to well @ 3am...
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Old 04-18-2008, 10:16 PM   #4
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BP's right about the air test. Many jurisdictions go beyond the code air test requirement of twice the working pressure (about 1/2 psi in this area) and require a little more air pressure. 10 psi is common around here.

I'm assuming you're just using the sawzall to demolish the existing lines, and that you know that you must make all of your connections with NPT tapered black iron gas pipe once you put everything back together.
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Old 04-18-2008, 11:24 PM   #5
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yes i am using the sawzall to demo the old 1" line, and replacing it with 3/4 black iron. i can use a test gauge that go up to 15psi right? thanks again...
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Old 04-18-2008, 11:43 PM   #6
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Why are you downsizing the pipe? Unless you're reducing the btu/h load or length of run, you should not reduce the 1" pipe to 3/4". It could affect the performance/function of the gas appliances it supplies. If you need help sizing the pipe let me know and I'll walk you through it.

Yes, a 15 pound gauge would work just fine. They have NPT thread on one side, and a schraeder valve like a tire on the other.
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Old 04-19-2008, 08:44 AM   #7
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Hi again guys.

In my area that 15 PSI guage is not legal. I understand that each area has its own requirements...but just wanted to let lyndon know that I have used 15PSI guages and had no leaks..then I used the 5PSI guage (1/10th PSI increments on dial) and believe it or not, there was a small leak.

All depends on how long holding the air test. If holding 1-2 hours, I bet the 15PSI guage is fine. If holding test for 10 minutes...gotta go with the other guage (my opinion).

Any idea what testing PSI is required in your area..??

This was just FYI for lyndon. Good day all!!
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Old 04-19-2008, 09:43 AM   #8
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Air test here is 15psi for 15mins

Using a 30 psi gauge

Don't feel bad about your spelling even BP spells wrong once in awhile.
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Old 04-19-2008, 12:24 PM   #9
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are you getting rid of the 1 " pipe completly why are you reducing the size?
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Old 04-19-2008, 12:28 PM   #10
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I have cut into gas pipes to add unions make repairs etc, make sure thegas is off and I always turn on stove or let pilots fully go out, just make sure your main shut valve outside really works .
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Old 04-19-2008, 02:52 PM   #11
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I am always amazed at the differences between states...good to know so can advise better in the future!!

And Ron...I am always misspelling gauge!!... Drives me crazy!!

Good day all.
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Old 04-19-2008, 06:55 PM   #12
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Hey guys, here’s the plan. I have a 1” gas line coming off the meter running across the center of the basement ceiling and over the stairs with a 2x4 mounted to the railing holding up the 1” line. I know, shabby work! My friend just brought the house. the total run is around 20ft.

I want to remove the 1” line and replace it with the ¾ and run it along the wall and ceiling. This line is a dedicated line for the heater, not sure what btu it is, I’ll find out…
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