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Old 07-07-2012, 12:37 PM   #1
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LP gas line pressure

Replaced water heater. In doing so I moved the gas line. After doing a pressure test that failed I replaced my old furnace gas valve.. Pressured @ 14#s and it held for about three hours @ 13#s when the ambient temperature dropped about 10 degrees. Overnght it went from 13 to 8 1/2 I repressured to 14#s and it's the same after several hours.. Is it safe to hook up my gas line to the system?


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Old 07-07-2012, 03:56 PM   #2
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Get a professional out to troubleshoot this installation.
Gas installation is NOT for the average DIYer


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Old 07-08-2012, 12:33 AM   #3
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Originally Posted by 505adolfo1 View Post
After doing a pressure test that failed I replaced my old furnace gas valve..
Did you still have your appliances connected when you preformed the test? You're supposed to have all appliances disconnected, and their valves plugged. Valves sometimes leak slightly at test pressures. If the appliance is connected to the valve and it leaks, you've just subjected the appliance to 25x (@10psi) , or 35x (@14 psi), its operating pressure (~.4 for LP). And then there's a good chance that you've damaged the appliance.

As to your original question, can you put gas in your system? There's a simple answer, do you have your inspector's sign off for the pressure test on your gas permit?

Some fluctuations due to changes in the local pressure & temperature are to be expected. 14 to 8 1/2 seems to be a bit much. So I'd suspect that you may have a small leak, unless you've had some extreme changes in temperature and/or pressure. Your inspector can tell you what he expects to see in order to sign off on your permit.

Last edited by a_lost_shadow; 07-08-2012 at 12:44 AM. Reason: Corrected numbers for LP.
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Old 07-08-2012, 12:59 PM   #4
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LP gas pressure test

Problem solved guys. I did have a professional plumber working with me He had to leave temporarily while I was testing the line. The problem was a bad furnace gas valve down the line which I replaced, and yes my appliances, [all two\ were disconnected at the time. Final results, inspection passed and I now have a new working hot water heater system.
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