Where cables and other utilities are identified in close proximity to the proposed alignment they should be exposed so that progress of the drilling can be monitored and stopped if required. Reliable communications must be in place between the pipe entry location and the drilling rig operator, so the rig can be stopped immediately if required. Monitoring and contingency planning should be in place prior to and during drilling below or in the proximity of environmentally sensitive locations.
See also Standards and Codes of Practice. At diameters up to and including mm 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.
At mm the maximum length on a coil is generally metres, and smaller diameters can be longer. The two major sources of possible damage to the new pipe are excessive pulling force exerted if the pipe seizes during pull-back as might occur if some of the bore collapses, and scoring by any hard or rock fragments in the bore. Because the operator of the drilling rig might not notice a momentarily excessive pulling force, a load link inserted between the swivel and the PE pipe to record pulling load can be used to record the maximum axial load exerted on the pipe.
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. This is to be avoided if at all possible. 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. Pipes installed by HDD may increase in diameter, and therefore decrease in length, when pressurised, which will result in some axial tension.
It is important that, if the pipe to which the new pipe is being connected has spigot and socket joints, which will have little end load resistance, means must be provided to absorb the axial tension. 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 pipe must be appropriately aligned with the bore and at an appropriate bending radius to avoid any risk of kinking. Along with providing a brief introduction to the association, the webinar will focus on the benefits of using pre-compounded PE materials certified by the association and highlight some of the PE technical guidance.
Pilot Tube Microtunnelling. Impact Moling. Mole Ploughing. Pipe Rehabilitation Methods Die Drawing. Slip lining. Pipe Bursting and Splitting. Pipe Reaming. Pipe Extraction. Supporting Processes Pipe Assembly and Handling. Installation Manual. End fittings. Piecing Up. Standards and Codes of Practice. PE Pipe : Properties and Types.
Quick access. The pipeline is prefabricated at the end of the bore opposite the drill rig. A reamer is attached to the drill string, and then connected to the product by a pulling head and swivel. The swivel allows for the reamer to turn without the product turning. The directional drilling rig then begins the pullback operation, rotating and pulling on the drill string as well as circulating drilling fluids.
The pullback continues until the reamer exits the bore path by the directional drill rig and the pipeline is in place. If the horizontally bored conduit is to carry power lines, fiber optic cable, or some other product, an aircraft cable is inserted into the pipe prior to pulling into position.
After the pipe installation, the directional drill rig is used to pull the product into position within the pipe. Less equipment, manpower and fuel needed per meter of installation. Lower surface restoration costs and economical costs caused by road closures. Be careful when transporting the machine off of or onto the trailer. Place warning cones around the trailer and truck; use other traffic control devices if required by the local authority. When unloading a machine from a trailer, make sure the trailer is on level ground and drive slowly off the ramps.
Do not unload the machine if the trailer surface is slick from ice or snow that could cause the machine to slide off the trailer. Horizontal Directional drilling White Papers. Go to white papers. Horizontal Directional Drilling equipment at locations. Contact us. Have any questions? Reach out today! Call now.
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