Horizontal directional drills are commonly used when it's either impractical or impossible to dig a trench, such as under a highway, body of water, or railroad.rnThe basic process consists of drilling a pilot hole, reaming it to the appropriate size, and pulling the new section of pipe back through the bore. How do you take that difficult process, which is fraught with challenges, and make it even more challenging? You ream the bore to a diameter of 54 inches, and instead of pulling one new pipe section through it, you pull 10 bundled casings, totaling nearly 2,100 feet in length.
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