"The photographs are genuine and do show the results of a gas pipe explosion but this explosion was not caused by a post hole digger, backhoe or any other excavator and nobody was killed in the incident.
In fact, the explosion was caused by corrosion in the pipe and was not the result of any excavation work."
"Five people were injured and two homes were destroyed in the blast."
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"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
Yeh well they operate at about 3,000psi if I recall. Then when going from liquid in pipe to gas n the air it expands by a huge factor. (200:1 for LPG in van so this would be astronomical)
I went to work it out for 3000psi at flow rate of say 1000gpm to see the volume of gas ---gave up too complex,, any experts out there???
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Why is it so? Professor Julius Sumner Miller, a profound influence on my life, who explained science to us on TV in the 60's.
Dial before you dig may seem like a great idea and it is to cover your a$$ but invariably the telephone line is nowhere near where it should be. Ours was one spade under the surface about 20ft from where it should have been.
When the PMG laid lines they probably were pretty exact but now private contractors do the work and are rarely checked.
Good Luck.