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Old 09-11-2012, 10:49 PM   #1
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Pressure testing gas line


I finished installing a 250 ft underground gas line from my house to my unattached garage. I pressurized the line to 15 lbs and it held for about 2 plus weeks. (I closed the trench after 3 days and no drop). After one month the pressure has dropped about 5 lbs. (10lbs remaining) The outside temp has also dropped from a high of 100 and a low of 75 to a high of 80 and a low of 55. I was wondering if I should increase the pressure back to 15 lbs or maybe I don't have a problem if some slight leakage is normal and the temp difference had reduced the pressure. Thanks.

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Last edited by twiddlebug222; 09-11-2012 at 10:51 PM. Reason: Spelling changes and clarification added
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Old 09-11-2012, 11:22 PM   #2
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Pressure testing gas line


Hmm no expert but I would not want an unknown underground slow gas leak anywhere!

Just me. Did you use a gas liquid leak test on joints? Something simple like dish soap and water? Check for bubbles?

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Old 09-11-2012, 11:26 PM   #3
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Pressure testing gas line


Gauge or valve maybe the reason for the drop. pump it up again for 24 hrs then recheck you should be fine.
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Old 09-12-2012, 09:45 PM   #4
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Pressure testing gas line


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Originally Posted by twiddlebug222 View Post
I finished installing a 250 ft underground gas line from my house to my unattached garage. I pressurized the line to 15 lbs and it held for about 2 plus weeks. (I closed the trench after 3 days and no drop). After one month the pressure has dropped about 5 lbs. (10lbs remaining) The outside temp has also dropped from a high of 100 and a low of 75 to a high of 80 and a low of 55. I was wondering if I should increase the pressure back to 15 lbs or maybe I don't have a problem if some slight leakage is normal and the temp difference had reduced the pressure. Thanks.
we call that a buried house line....requirements for testing...90psi with a colemen gauge for 10-15 min..
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