Posted by jeffcat on March 01, 2016 at 14:38:24 from (76.116.244.142):
In Reply to: LP line update posted by JimS on March 01, 2016 at 13:55:02:
When I work on big commercial stuff with natural gas I bleed the line a GOOD shot. The vent hoods are running or you Have plenty of air moving. The line will whistle with a trillll kind of sound with natural gas. People run for their lives and I just sit there and laugh at them. On your gas lines you should always use BLACK pipe and nothing else if possible. Propane will make little black specks with copper tube and galvanized will make little silver speckles in you valves and pilots. Just had that problem last week on a rotary bakery oven. The rear burner would not stay lit in :bypass: mode. Silver flakes in the little control valve. Cleaned it out and got a shower of sparkles in the flame. All fixed now. Just remember that natural gas is the same specific gravity as air and mixes vary well. Lp is like twice the weight of air and crawls along the floor. It also makes damn nice little puddles of un mixed gas here and there. Lots of BTUs to go boom! Will take all of the hair off of your legs if you get a flash over. If you open a Natural gas line you hear it go HIsssssss. If you open an Lp line it kinda goes Whoaaaaaaahhhh like a person breathing out of their mouth. Moisture in your breath makes it heavier. Same with LP. I have worked with this stuff for over thirty years now.
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