bc said: (quoted from post at 20:00:51 05/29/09) I knew a welder who could weld on a live 8" lpg propane gas lines. Not sure what he was doing or why, but as long as he didn't burn through. I think he was welding on or around well heads for underground storage wells. Plus propane is cold anyway.
So far as I know, all or most all taps are done on live lines. I serviced HVAC here locally for nearly 15 years, and now there's more and more plastic, but where there's metal, they weld taps on "live."
I think most city street service stuff is 120-250 lbs. The line coming past my folks semi-rural home is the main feed for my small hometown. I believe it's up around 500 psi or so. For many years, "they" would not tap individual homes off that main line. This comes from the big big really big Canadian tube I mentioned earlier.
When I went to "gas" school, the local (Spokane) then Washington Water Power, had a section of large plastic, maybe 3"? or so, someone had driven a standard 8' ground rod right through the middle of the thing.
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