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Title: Directional-Drilled Polyethylene Gas Pipe
Author: Larry J. Petroff
Source: American Gas Association 2004
Year Published: 2004
Abstract: Horizontal directional drilling or guided boring, as it is sometimes called, is a cost effective method for installation of polyethylene gas pipe in urban and congested suburban areas. Most urban/suburban communities prefer trenchless installation to open-cut trenching because of the reduced disturbance to business, traffic, and surface features such as landscaping. Many gas utilities have come to appreciate the advantages of directional drilling, finding it easier and more cost effective not only to install pipe in populated areas but also easier to get regulatory approval through environmentally sensitive regions. Since this installation method is becoming widely used, it is important for gas utilities to understand the engineering and construction aspects of directional drilling. This paper describes and discusses the major engineering considerations for directionally drilled pipe both during pull-in (pullback) installation and post-installation service. It discusses ways to determine the applied forces and how to compare these forces with the pipes performance limits for tensile strength, external collapse, bending, and ring deflection. This paper draws heavily on ASTM F1962, Standard Guide for Use of Maxi-Horizontal Directional Drilling for Placement of Polyethylene Pipe or Conduit Under Obstacles, Including River Crossings, thus acquainting the gas utility engineer with this useful standard.

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