Supporting the 10 main sections, several appendices provide the physical properties of selected PE material, as well as a means of determining the post-installation loads and pipe deflection. Special care must be taken with the pressure of drilling mud, especially when the operation is shallow. Directional Drilling Directional drilling is the drilling of non vertical wells. At diameters up to and including 180mm the new pipe can be supplied as a coil, and this will be loaded into and dispensed from a coil trailer, positioned adjacent to or over the entry excavation. Safety and environmental considerations (Section 5). Pipeline geo-environmental design and geohazard management. [2], Directional boring/HDD is generally accomplished in three principal phases. Lengths well in excess of 1000m can be installed with this technique, though depending upon the diameter required the limiting factor may be the axial load capacity of the PE100 pipe for pull-back into the bore. The use requires that the operator have complete information about existing utilities so that they can plan the alignment to avoid damaging those utilities. It is the only system that has the capability of verifying the location. Anticipated Schedule. Although pipe stiffness effects may generally be ignored for flexible PE pipe, there is a potentially important effect can be due to route bends or any path curvature of significance. New York, NY: ASME, 2008. Why choose PE compounds for pressure pipe ? Directional boring offers significant environmental advantages over traditional cut and cover pipeline/utility installations. Often used in trenchless applications where digging is difficult or impossible, high density polyethylene (HDPE) pipes have many characteristics that make them the choice product. F1962 Standard Guide for Use of Maxi-Horizontal Directional The MGS, even without the use of the wire grid, has been accurate to over 2km with an accuracy of 2% at depth. Because trenchless technology greatly reduces the need for invasive excavations, it has a much smaller impact on the surrounding environment, both ecologically and socially. 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. 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. This arc follows a preset bore path using a surface drilling rig. 19), PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council Horizontal directional drilling (HDD) is a cost-effective method for installing polyethylene (PE) gas pipe in urban and congested suburban areas, and many gas utilities have come to appreciate its advantages. The image above shows a straightener re-rounder being used on a 180mm pipe, and whilst it is in the trench here, it can be attached to the coil trailer if so desired. 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This is a highly specialised technique, and needs an experienced and highly trained operating team, an essential member of which is the drilling mud technician, particularly on the larger diameters. Thus, a commonly used procedure for difficult or very long installations is to fill the pipe with water to reduce the buoyancy. The traversing pipeline can fully meet the design curve and deep buried, and the quality is safe and reliable. It offers unmatched corrosion and chemical resistance, is flexible, durable and available in long reel lengths to reduce joints and installation time. The Calculator uses input such as directional changes in the bore path, and other project variables, to determine the Calculated Tensile Load on the selected HDPE conduit, as compared to the . %%EOF This material is significantly tougher than older, previously used PE products, facilitating successful completion of more complicated, difficult maxi-HDD projects. This picture shows a slant face drilling bit, also fitted with carbide tipped teeth that enable it to penetrate hard ground. Pilot holes are enlarged in pre-reaming stages using a reamer (soft soils) or a hole opener (rock). The full range of PE100 diameters from the smallest to a maximum diameter of around 1200mm can be installed by HDD, though the required installation length may limit the use of PE100 pipe even if a heavy wall pipe is used. 0000017340 00000 n Soils containing high percentage of gravel and cobbles are best avoided unless the contractor is especially experienced in the conditions. The benefits of using HDPE for this applications are: Pipefusion provides polyethylene pipe, on-site fusion services, molded and fabricated fittings and custom fabrication to Directional Drilling contractors across Canada. When drilling through harder ground formations and in rock a mud motor is used to drive the drilling bit independently of drill rod rotation. [citation needed], For smaller bores, proportionally smaller and more portable equipment is available. During pull-in of the pipe a load link should be inserted between the swivel and the pipe to show and record the axial load applied. For such cases, the buoyant weight of the submerged pipe, in combination with the corresponding frictional characteristics, is the major factor in determining the required pull force. At the surface, the navigator in the drill cab performs the necessary calculations to confirm the parameters have been met. The primary focus is on commonly used high-density polyethylene (HDPE) pipe with a material designation code of PE4710. Drilling fluid may escape to the surface or other facilities unless carefully managed. Thus, FIGURE 2 shows the drilling operation proceeding from right to left, in contrast to FIGURE 1, where the drilling proceeds from left to right. Smaller drilling rigs suitable for installation of smaller diameters pipes are self-propelled rigs, typically track mounted, requiring little in the way of additional support equipment. 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. ASTM F 1962 provides formulae for determining the buoyant weight under various conditions. Polyethylene pipe is the pipe of choice for trenchless installations using directional drilling. Horizontal directional drilling shall consist of the drilling of a small diameter pilot hole from one end of the alignment to the other, followed by enlarging the hole diameter for the pipeline insertion. This information is encoded into an electromagnetic signal and transmitted through the ground to the surface in a walk-over system. The intermediate horizontal segment, L3, may be of zero length. sufficient tensile strength to meet the required tensile forces, based CANTEX's CAN>LOC and CAN>GRIP systems offer many benefits over HDPE, which is the conduit most used for HDD applications. Joints in traditional piping materials are the biggest source of leakage. FIGURE 1 illustrates the operation in a city or urban application. Horizontal Directional Drilling Plastic Pipe (HDPE & MDPE) Home; HDD (Polyethylene Pipe) - Input; Please [ Log . selecting the most appropriate wall thickness of HDPE conduit to be used 0000003343 00000 n The planned bore path, such as illustrated in. Successive reamers are then pulled back to enlarge the bore diameter to the desired size. [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 ]. For standardization of the techniques, different trenchless technology promoting organizations have developed guidelines for this technique. v. Hinueber, Edgar (iMAR Navigation) (2006). Any pipe installed by HDD is subject to loads of a different type and/or magnitude than are experienced in other construction methods, including by direct burial in a trench. Certain users require weak links that fail before the pipe if overload occurs but this will result in a partly installed pipe with no means of completing the installation without major disruption, cost and delay. For diameters greater than 180mm, the pipe should be made into a continuous string by butt fusion of straight lengths, and sufficient space must be available on site to make up and store the string ready for installation. select the wall type based on those results and other factors. The stiffness of the steel drill rods determines their allowable curvature, in order to avoid fatigue. NyPipe offers quality products, competitive pricing and reliable service. Fluid exhaustion associated with smaller bores is proportionally less as well. Typical Entry Site Layout. Especially HDPE raw materials have good adhesion and toughness. Horizontal Directional Drilling, Pipe Bursting, Microtunnelling and Pipe Jacking, Rev 1, February 2010; b. 0000017112 00000 n Recycled water pipeline completed in Encinitas, Calif. Drill bit location for smaller and shallow installations is typically transmitted by a battery powered sonde, located just behind the bit, the signals being picked up by a receiver operated at the surface. Used in the oil industry to cross the river oil pipeline, Used in power system for the telecommunications cable conduit, Used in the construction of municipal drainage pipelines, Water and gas pipeline network transformation. Complete Tooling Line ( All Types of Bits, Subs, Housings) Drill Rod Drilling Muds & Fluids Mule Tape Couplers Darts HDPE Pipe PVC Pipe & Fittings PVC Glue h4~r High-density polyethylene pipes are now widely used in the sewer industry. Directional drilling is the drilling of non vertical wells. The pipe string is attached to the back-reamer through a swivel device. Horizontal directional drilling is used to connect underground pipes, wires, cables, and ducts with a trenchless underground drill technique that minimizes damage to infrastructure and environment. H0+X u7A@>&F True-Size), Wall Type (DR, SDR or Schedule), Diameter (nominal size), 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 MGS, also has a secondary means of location verification utilizing wire grids laid on the ground surface. Chapter 12 Horizontal Directional Drilling 416 borehole on pullback. Welcome customers to visit the factory, or third party factory inspection is acceptable. Load on the selected HDPE conduit, as compared to the allowable Safe Horizontal directional drilling is often used where open cut installations are not feasible, such as road and river crossings. FIGURE 2 illustrates a typical geometry for a maxi-HDD operation, in this case corresponding to a river crossing. They also have many advantages in terms of cost-effectiveness, minimal impact on the environment, and safer processes. The ASTM International document provides overall guidelines, addressing preliminary site investigation, safety and environmental considerations, regulations and damage prevention, bore path layout and design, implementation, and inspection and site cleanup. 3.0 SCHEDULE . The third stage places the product or casing pipe in the enlarged hole by way of the drill stem; it is pulled behind the reamer to allow centering of the pipe in the newly reamed path. HDPE pipes are ideal for pulling through long, underground holes as they are flexible, robust, and resistant to almost all aggressive elements. Pressure capability is dependent upon pipe SDR and is not a function of the method. User Inputs. 4498 0 obj <>/Filter/FlateDecode/ID[<4208EEF0A5E3F94484FA965871FBCC68><35164F1782C1CE48B496975219464345>]/Index[4487 20]/Info 4486 0 R/Length 74/Prev 887916/Root 4488 0 R/Size 4507/Type/XRef/W[1 3 1]>>stream Membership; Articles; Analyses . The Conduit Design Calculator automates the Mini-HDD calculations described in PPI TR-46 Guidelines for Use of Mini-Horizontal Directional Drilling for Placement of High Density Polyethylene Pipe.. xb```c````e`` @v @s@( LTo18R(l1kUpaqHO(>HHblBU2f$,G.9|lL7. When new pipe is to be installed or it is not possible to rehabilitate a pipe, so that it needs to be replaced but is in a congested area of buried infrastructure so that conventional methods such as bursting cannot be used safely, then a new or replacement PE100 pipe can often be installed by horizontal directional drilling. Horizontal directional drilling (HDD) is a safe method of installing an underground pipeline. The driller increases the diameter according to the outer diameter of the conduit and to achieve optimal production. Pipe manufacturers can advise on the allowable loads. HDD Analyser is a comprehensive program for the design analysis of pipelines crossings by horizontal direction drilling methodology. Safe for the environment, recyclable and does not emit hazardous toxins during manufacturing or installation. The risk of scoring of the pipe can be minimised by ensuring the reamed bore is of sufficient diameter and properly cleaned and proved prior to pipe pull-back. illustrates the operation in a city or urban application. 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. [4], The equipment used in directional boring depends on the length of the (proposed) crossing, the pipe properties (of the to-be-installed pipeline), and the (anticipated) subsurface conditions. 0 must be consistent with the steering capability of the maxi-HDD equipment, and the bending capability of the drill rods. Add: 13th F, Longyu International Building, Zhengzhou Area(Zhengdong), China(Henan) Pilot Free Trade Zone. For flexible PE pipe, with minimal bending stiffness, the considered bearing forces are those due to the: In addition, the drilling fluid/slurry flowing along the length of the pipe also contributes, but is relatively low, based on the present model. Coiled products should be restrained before being released or cut. several outputs are shown simultaneously, along with a summary of the An additional length L1 exterior to the drilled path allows for handling at both ends and possible other effects (path curvature, thermal contraction, stretching, etc.). Experience: Actively engaged in horizontal directional drilling for minimum of 3 years. 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. hbbd``b`$mA,k D\ It is used instead of other techniques to provide less traffic disruption, lower cost, deeper and/or longer installation, no access pit, shorter completion times, directional capabilities, and environmental safety. The technique is routinely used when conventional trenching or excavating is not practical or when minimal surface disturbance is required. Those directly related to the setup and operation of the maxi-HDD equipment (machine and hydraulic operations, as well as the drilling fluid under high pressure). As the drill string is withdrawn to the drilling rig, the back-reamer enlarges the borehole and the pipe string is pulled into the hole. It's flexibility, strength and fused joints as strong as the original pipe itself, make it ideal for HDD applications. For direct comparison, two instrumented 200mm SDR-17 DIPS HDPE pipes were . See also Excavations, pit sizes, Space and Access. 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. HDD is a steerable trenchless technique of installing everything from pipe to cable with minimal construction footprint and minor impact on surrounding areas.
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