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Title: Backhoe Mounted Tapping Equipment Development And Use
Author: Herbert F. Rothfuss
Source: American Gas Association 1983
Year Published: 1983
Abstract: Years of observing main tapping operations relative to bag off holes, or transfer of services, fostered an intense desire to find a simpler method of tapping holes. The effort and cost required to excavate around and below a gas main, and install sheeting, particularly on large diameter mains at excessive depths, seemed to be wasteful. During the winter of 80-81, BUG was installing a new 12 (300 mm) steel gas main crossing an intersection with various utility interference, in particular, a 48 (1200 mm) gas main at 3 -6 (1.1 m) depth which had been retired since 1974. Rather than excavate and install the new 12 (300 mm) main at 8-6 (2.6 m) cover it was decided to remove a section of the 48 (1200 mm) pipe and maintain the normal cover on the new main. The most effective method available to cut the 48 (1200 mm) cast iron pipe was to use our plasma arc burning equipment. A test hole was made over the 48 (1200 mm) retired main and combustible gas indicator readings of 20% gas in air were found.

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