RECORDS SET, DRILLING CALCULATION REFINED IN DUTCH PIPELINE CROSSINGS

Jan Spiekhout, Jan Gorter, Willem H. Hartlief N.V. Nederlandse Gasunie Groningen, The Netherlands Horizontal drilling for pipeline installation made significant progress in The Netherlands in 1991 with establishment of two diameter records and development of a simplified design calculation method. The records were established in two natural gas pipeline projects by N.V. Nederlandse Gasunie, Groningen. In companion waterway-crossing projects, installation of two 48-in. gas lines by directional

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