horizontal directional drilling hdpe pipe
The planned bore path, such as illustrated in FIGURE 2, must be consistent with the steering capability of the maxi-HDD equipment, and the bending capability of the drill rods. The route planning should include subsurface investigations/survey to identify ground conditions, so that appropriate equipment can be selected. [citation needed], Horizontal directional drilling is done with the help of a viscous fluid known as drilling fluid. Whilst the drilling equipment is able to drill down from the surface at the start and come back up to the surface at the exit, there does need to be an excavation at each end to act as a sump for drilling fluid reclamation, but the most critical factor is to provide the space to transfer the new pipe from ground level down to the bore, and this will depend upon both the diameter and length of the installed pipe. The use of HDPE pipes in trenchless technology is rapidly becoming a repair building and civil engineering The preferred method of domain pipeline. A bore diameter of 1.2 to 1.5 times the PE100 pipe OD is normally required. cut-and-cover and horizontal directional drilling (HDD) techniques are used to install utility pipes under flexible pavements. 3), PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council At the surface a receiver (usually a hand-held. as well as possible bends in the horizontal plane, should be avoided, and will increase the required pulling forces. The technique is routinely used when conventional trenching or excavating is not practical or when minimal surface disturbance is required. The exposed leading end of the pipe should be inspected for possible damage and a pressure or leakage test may be required, for fluid transport applications. To improve your experience, other cookies may be used: you can choose to disable them. The MGS, even without the use of the wire grid, has been accurate to over 2km with an accuracy of 2% at depth. It is conducive to protecting the environment and does not affect the normal passage of roads. The tensile load on the pipe during installation must be calculated to establish whether it exceeds the maximum allowable load. Because of its high ductility and flexibility, and ability to be fused in continuous lengths, per the well-established ASTM standards and by experienced contractors, PE, particularly high-density polyethylene (HDPE), is the most commonly used pipe product for HDD projects. The project quality is good. High-density polyethylene pipes are now widely used in the sewer industry. F1962 Standard Guide for Use of Maxi-Horizontal Directional Pipes installed by HDD may increase in diameter, and therefore decrease in length, when pressurised, which will result in some axial tension. CANTEX's CAN>LOC and CAN>GRIP systems offer many benefits over HDPE, which is the conduit most used for HDD applications. 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FIGURE 2 illustrates a typical geometry for a maxi-HDD operation, in this case corresponding to a river crossing. 0000015903 00000 n Experience: Actively engaged in horizontal directional drilling for minimum of 3 years. 0000002386 00000 n 0000004070 00000 n tensile strength to meet the required tensile forces, and the User can MDPE and HDPE pipes shall conform to the current ASTM D1248, ASTM D2513, ASTM D3350, and ASTM F714. Why choose PE compounds for pressure pipe ? Day 1 Equipment Arrives Days 2-5 Locate and identify utilities . Since uncontrolled drilling can lead to damage, different agencies/government authorities owning the urban right-of-way or the utilities have rules for safe work execution. This material is significantly tougher than older, previous polyethylene (PE) products, facilitating successful completion of more complicated, difficult maxi-HDD projects. The HDPE pipe chosen for the twin sewage tunnels has an outside diameter of 740mm and an internal diameter of 600mm, with a standard dimensional ratio (SDR) of 11 and a pressure rating of 16 bars. 0000021613 00000 n D2dIFya New York, NY: ASME, 2008. 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. 29), PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council As the use of trenchless technology continues to grow in popularity and use, so too does the importance of using top-quality pipe material that meets the specific requirements of the particular technique being used. 0000029482 00000 n For the geometry shown in FIGURE 2, with relatively shallow entry and exit angles, the associated load amplification due to this effect is not major; although for more complex paths, the effect could be very important. One of the most significant contributions of ASTM F1962 is the provision of a rational, analytical method for selecting the pipe strength based on estimated installation loads on the PE pipe. Horizontal directional drilling (HDD) consists of several installation steps. sufficient tensile strength to meet the required tensile forces, based [citation needed], Location and guidance of the drilling head is an important part of the drilling operation, as the drilling head is under the ground while drilling and, in most cases, not visible from the ground surface. 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. 7_ In the absence of anti-buoyancy techniques, such as internal water ballast, the frictional drag developed within the borehole is generally much greater than that developed outside, because of the high buoyant weight for an empty PE pipe. Drilling mud is used to cool the cutter and transmitter electronics, to flush excavated soil from the borehole and to lubricate the borehole. True-Size), Wall Type (DR, SDR or Schedule), Diameter (nominal size), Welcome customers to visit the factory, or third party factory inspection is acceptable. MAB-08 (2022) - MAB Guidelines for Fusing HDPE Pipe in Cold and Inclement Weather, Horizontal Directional Drilling Estimating Pipe Pulling Tensions, Dr. Lawrence M. Slavin, Aug 2022. In the absence of ballast, the maximum total calculated tension will typically occur towards the end of the installation; e.g., at point C or D. The net resulting peak tensile stress is required to be less than the safe pull tensile stress of the HDPE pipe. The plastics pipe industry is a strategic industry, where hardware needs to be reliable for extended periods of time. printed as a PDF file or as a paper file. HDPE pipes are ideal for pulling through long, underground holes as they are flexible, robust, and resistant to almost all aggressive elements. For the larger diameters, the equipment is large, and requires support equipment such as generators and hydraulic power units. %%EOF The most significant was to the alternative guidelines TR-46 provided by the Plastics Pipe Institute (which has been superseded by its Municipal Advisory Boards MAB-7), as more appropriate for mini-HDD operations. The image above shows a sonde and battery fitted inside a slant face drilling head. HDPE pipe are widely used for trenchless sewer lateral replacement. xref endstream endobj startxref Horizontal drilling, one type of directional drilling, is a method that is used to install pipes, conduits and cables underground in a long shallow arc. This method is regularly used on distribution systems, which typically use small diameter mains, and on rural distribution systems it often enables mains to be installed alongside the carriageway without impeding traffic flow, as the drilling equipment is compact and self contained. The traversing pipeline can fully meet the design curve and deep buried, and the quality is safe and reliable. FIGURE 2 illustrates a typical geometry for a maxi-HDD operation, in this case corresponding to a river crossing. [citation needed], For longer more challenging crossings, tractor trailer mounted drills capable of 1,320,000 lbs (thrust/pullback force) and 150,000 ft-lbs (rotary force) may be used [600 tonnes- 204,000 N-M ]. ASTM F 1962 provides formulae for determining the buoyant weight under various conditions. This information is transmitted through the wire-line fitted within the drill string. The route of the new main should be carefully investigated to identify any potential clashes with existing buried infrastructure and, where necessary, the exact locations of any such clashes should be proved by trial holing. Example of Capstan Effect (Courtesy of Outside Plant Consulting Services, Inc.). In many instances, smaller bores do not require the use of drilling fluid, only water, and in even less significant bores no fluids at all. ASTM F1962 addresses the overall planning and design, product selection and installation practices for the placement of PE pipe using maxi-HDD equipment. With a magnetic guidance system (MGS), the tool reads inclination and azimuth. select the wall type based on those results and other factors. The driller increases the diameter according to the outer diameter of the conduit and to achieve optimal production. All three systems have their own merits, and a particular system is chosen depending upon the site requirements. Joints in traditional piping materials are the biggest source of leakage. 1.1 Pipe Approved materials for HDD include: medium-density polyethylene (MDPE), high-density polyethylene (HDPE), steel, fusible PVC, restrained joint PVC, and ductile iron pipe. Pipeline geo-environmental design and geohazard management. selecting the most appropriate wall thickness of HDPE conduit to be used 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. 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. The initial decision involves selecting the size and capacity of the machine. Image Courtesy:Exova Utilities, Barrel Reamer.Image Courtesy:Exova Utilities, Mud recycling plant. 0 Due to the magnitude and complexity of maxi-HDD equipment and control systems, a well-trained, experienced crew is essential to plan and execute the operation. 745 0 obj <> endobj 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. 450046. Advancement of tooling within loose uncemented soils is largely accomplished by hydraulic excavation. Pressure capability is dependent upon pipe SDR and is not a function of the method. ?5Hb0CB$ 17C``!Dc@ q The indicated bore/pipe path comprises three segments spanning the pipe entry (point A) to its exit point (point D), with horizontal projected distance Lbore, equal to the sum of the three horizontal (projected) segments L, exterior to the drilled path allows for handling at both ends and possible other effects (path curvature, thermal contraction, stretching, etc.). Residential neighbourhoods remain unscathed, commercial districts do not have to deal with loss of business, and rural regions remain undisturbed. Drilling fluid may escape to the surface or other facilities unless carefully managed. Advantages of the High Density Polyethylene Trenchless Pipes For Horizontal Directional Drilling The biggest advantage of HDPE HDPE trenchless pipes for HDD besides its long-life expectancy, is its heat-fused joints, which make the pipe a single homogenous pipeline. Soils containing high percentage of gravel and cobbles are best avoided unless the contractor is especially experienced in the conditions. Thus, ASTM F1962 provides a means of determining project feasibility, as well as initial design information. At the "maxi" end of the range, several loads of equipment are typically shipped to site and the site area required is a significant consideration. HDPE Pipes and Fittings for Water and Gas, HDPE Pipes and Fittings for Drinking Water, Steel Wire Reinforced HDPE Composite Pipe, HDPE Pipes and Fittings for Natural Gas & Oil. It has a wide range of applications and is not affected by water currents, climate and environment. 0000019257 00000 n The pipe must be securely gripped, including a swivel and possible breakaway link. Unnecessarily large curvatures (sharp bends) also contribute to bending stresses in the HDPE pipe, but generally are not significant for such a flexible product. Image Courtesy: Exova Utilities, Large "maxi" drilling rig.
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