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Replies:
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| fitter597
|  "Re(1):purpose of a low pressure gas line?"
, posted Mon 27 Aug 17:43  
There is no difference in the piping or piping practice between low and high pressure gas. They are both the same pipe, most likely a steel schedule 40. It's most likely a make-up air unit and the piping hooks to a gas trane with a regulator and vent.
Pipefitters Local 597
" We do it right the first time"
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| Gregg Harris
| "Re(1):purpose of a low pressure gas line?" , posted Mon 27 Aug 14:23
I will guess that you are referring to a natural gas line with 1/2 psi pressure.
"It takes less time to do something right the first time than it does to explain why you did it wrong."
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| | nsolo
| "Re(2):purpose of a low pressure gas line?" , posted Tue 28 Aug 08:49
quote:
I will guess that you are referring to a natural gas line with 1/2 psi pressure.
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I know nothing about the pressure within the pipe. I'm investigating an incident where a vehicle backed into an outside Direct Fire Unit, moved it which ruptured a 3" low pressure natural gas line.
It has been stated that the resulting rupture presented a fire hazard. What I would like to discover is this, does a low pressure gas line presents the same fire hazard as a higher pressure line?
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| | fitter597
| "Re(3):purpose of a low pressure gas line?" , posted Tue 28 Aug 21:08
I would think they both pose the same danger, if you start a fire with a match or a torch the end result will be the same i would think.
Pipefitters Local 597
" We do it right the first time"
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| | Gregg Harris
| "Re(3):purpose of a low pressure gas line?" , posted Tue 28 Aug 11:32
quote:
I know nothing about the pressure within the pipe. I'm investigating an incident where a vehicle backed into an outside Direct Fire Unit, moved it which ruptured a 3" low pressure natural gas line.
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The answer to your first question does the low pressure gas leak pose the same fire hazard as a high pressure gas leak? The answer would be no. The 3 inch gas line on your unit would produce at 1/2 psi (pounds per square inch) delivery of approximately 11,000 cubic feet of gas per hour, and under a 2psi which is a high pressure you would only need to have a one inch line to deliver the same volume of gas. Are both situations dangerous? Yes but the lower volume of gas at the lower pressure posses the lower threat. I would be looking at how the vehicle struck the equipment, if located in a parking lot area it should of had barrier's installed to prevent damage.
"It takes less time to do something right the first time than it does to explain why you did it wrong."
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