Horizontal directional drilling (HDD) is a technique used for trenchless installation of underground pipelines, such as HDPE (high-density polyethylene) pipes. The process involves drilling a small pilot hole along a predetermined path and then gradually enlarging the hole using a drilling rig and a reaming tool until it is large enough to accommodate the pipe.
The HDPE pipe is typically pulled through the hole using a special device called a pipe puller. The pipe is attached to the pipe puller, which is then pulled back through the hole, dragging the pipe behind it. The process is slow and requires careful monitoring to ensure that the pipe is not damaged during installation.
HDD installation of HDPE pipe is a popular choice because it offers several advantages over traditional open trench installation. For example, it reduces the amount of excavation required, minimizes disruption to the surrounding area, and can be used to install pipes in areas where open trench installation is not feasible, such as under roads, buildings, or waterways.
HDD installation of HDPE pipe is commonly used for a variety of applications, including water distribution, gas distribution, and sewer lines. It is an efficient and cost-effective way to install pipes underground, and it has become increasingly popular in recent years as more and more municipalities and utilities seek to minimize the disruption caused by traditional open trench installation.