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Title: Stresses Imposed On A Pipeline By Longwail Mining
Author: Glenwood R. Hayes, Jr.
Source: American Gas Association 1980
Year Published: 1980
Abstract: The purpose of this report is to discuss the results of a testing program being conducted by Columbia Gas Transmission Corporation to determine the effects and behavior of its LINE 20 pipeline while under the influence of ground subsidence caused by longwail mining. LINE 20 is a continuously welded 12M O.D. X 0.250 wall steel pipeline, with a Specified Minimum Yield Strength of 42,000 PSI. Maximum Allowable Operating Pressure is6l7PSIG. The total longwail mining operation consists of seven longwail panels, four of which are directly beneath Columbias LINE 20 pipeline. See Figure 1. Each panel to be longwail mined is approximately 650 feet in width and approximately 5,000 feet in length. The coal seam varies in thickness from 64 inches to 68 inches, with a horizontal slope of essentially 0 degrees. The depth of the coal varies from 800 feet to 1,000 feet from the surface.

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