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HDPE Pipe Installation Methods - An Overview of 6 Common Methods Physical properties of the PE material(s) are provided in the appendices, which allow determination of an appropriate wall thickness for the pipe, depending on its diameter and estimated peak pulling force (or tendency to collapse). At no time during welding or installation must the pipe be allowed to drag on the ground and it must therefore be supported on rollers, though it should be stored directly on the ground to avoid indentations from supporting rollers or timbers if there is to be a delay in installation. Horizontal Directional Drilling (HDD) Design Methodology | all about All three systems have their own merits, and a particular system is chosen depending upon the site requirements. COPYING AND DISTRIBUTING ARE PROHIBITED WITHOUT PERMISSION OF THE PUBLISHER. The stiffness of the steel drill rods determines their allowable curvature, in order to avoid fatigue. endstream endobj startxref Drilling fluid holds the cuttings in suspension to prevent them from clogging the bore. The pipe string is attached to the back-reamer through a swivel device. PDF Standard Specifications Horizontal Directional Drilling Part 1 General The tensile load on the pipe during installation must be calculated to establish whether it exceeds the maximum allowable load. The theoretical model used to develop the formulae for estimating the peak required tension (Section 8) assumes that the local frictional drag forces on the pipe are proportional to the local normal bearing forces applied at the pipe surface. Over the last two decades, contractors have increasingly turned to the horizontal directional drilling (HDD) method. 0000021965 00000 n Joints in traditional piping materials are the biggest source of leakage. Directional boring offers significant environmental advantages over traditional cut and cover pipeline/utility installations. PDF Horizontal Directional Drilling Plan - Snohomish County PUD