Pig catcher joint developed by Northern Natural Gas Co eliminates flight of 415-lb big-inch pig through air; catcher joint is made of pipe 40 ft long; upstream end of pipe is slotted; slots are sized to permit air traveling ahead of pig as well as gas behind pig to escape; diagrams.
Catch joint prevents flight of pig
World Oil
World Oil ; 134 , n 7
1952
Aufsatz (Zeitschrift)
Englisch
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