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In addition, there should be a detailed subsurface investigation, including test borings and soil analysis, to confirm the general suitability for the drilling operation, and to determine the appropriate equipment and hardware. 745 0 obj <> endobj It's flexibility, strength and fused joints as strong as the original pipe itself, make it ideal for HDD applications. It is the only system that has the capability of verifying the location. Allowable pulling loads are based on a minimum tensile yield strength of 3,500 pounds per square inch (psi), with a significant reduction to limit non-recoverable viscoelastic deformation, as well as account for the effective cumulative load duration on the pipe (assumed to be 12 hours), resulting in a safe pull stress of 1,330 psi. Directional boring and HDD are similar in some respects to directional drilling associated with the oil industry, however, an equal comparison cannot be drawn as the procedures serve markedly different functions. Zj? Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig. CANTEX's CAN>LOC and CAN>GRIP systems offer many benefits over HDPE, which is the conduit most used for HDD applications. HDD Analyser is a comprehensive program for the design analysis of pipelines crossings by horizontal direction drilling methodology. On inaccessible projects such as river crossings or where the bore is at significant depth and where a surface receiver cannot be used, the drilling head location information is typically sent from the drill bit by a wireline system, via a wire running along the inside of the drill rods. True-Size), Wall Type (DR, SDR or Schedule), Diameter (nominal size), It is also important to identify areas of poor or difficult ground, such as gravel and cobbles, which could allow the drilling mud to escape or create bore instability unless an appropriately engineered drilling mud can be used. The term "directional boring" or "bore" is generally reserved for mini/small sized drilling rigs, small diameter bores, and crossing lengths in terms of hundreds of feet. That is, the soil is being cut and or removed under the influence of high pressure fluid. This is the basis of MAB-7 (2020), MAB Guidelines for Use of Mini-Horizontal Directional Drilling for Placement of HDPE (PE4710) Pipe in Municipal Applications, as referenced in the 2022 edition of ASTM F1962. The ASTM document provides overall guidelines for a maxi-HDD operation, addressing preliminary site investigation; safety and environmental considerations, regulations and damage prevention; bore path layout and design; implementation; and inspection and site cleanup. HDD | Horizontal Directional Drilling | Pipe Line Road Crossing These units may be capable of anywhere from 5,000 lbs to 100,000 lbs of thrust/push force and may be used for spanning between a house basement to a nearby shared water pipe. This phenomenon is referred to as the capstan effect, as it is the principle of the capstan winch, as illustrated in FIGURE 5.