Gas Mains


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Old 06-03-03, 01:14 PM
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changes to gas mains - slightly O.T.

when the utility replaces a gas main, or installs a side leg to serve a new house, they manage to do the work without (usually) disrupting service. i know that the main is under only a few inches of pressure, but still, a lot of gas would escape; and the downstream homes would be gas-starved for at least several minutes; and the new line/main would be getting a mix of air and gas in the line until it was purged.. SO, how do they do it?
 
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Old 06-03-03, 03:12 PM
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Hello: Bruce

Good question.

The simple answer is dual feed system.

The line in the street has about 30-35 pounds of pressure and is feed {supplied} from both sides. All gas mains are dual feed lines.

If the street supply pipe where not dual sided suppled, the problem you invision would result.
 
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Old 06-04-03, 06:06 AM
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great answer, and makes sense. it reminds me of British in-house electric distribution - complete loops back to the breaker panel, rather than our system of straight runs.
 
 

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