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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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