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Title: Design And Preliminary Engineering Considerations For A 20 Horizontal Drill Project
Author: Joseph L. Lavieri
Source: American Gas Association 1992
Year Published: 1992
Abstract: During a nine day period in July 1991, Yankee Gas Services Company installed a 1600 foot 20 diameter steel pipeline across the Thames River between Montville and Ledyard, Connecticut utilizing the horizontal drilling technique. Due to a limited work space prefabrication of a continuous welded pipe string was not possible. As a result, twelve 125 foot sections of 20 pipe were intermittently welded and pulled. The non-stop pullback operation required 42.5 hours to complete. The crossing was completed ahead of schedule, under budget and with no impact on the environment. It had minimal inconvenience to the public. All of this demonstrates that trenchless construction continues to play an important role in subsurface crossings.

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