The International Society for Trenchless Technology

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Glossary

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Horizontal Directional Drilling (HDD)

Method for the installation of pipes, conduits and cables using a surface-launched drilling rig. A pilot bore is drilled using a rotating drill string and is then enlarged by a back reamer to the size required for the product pipe. During the pilot bore the direction of the drill string is controlled by the orientation of a slanted face to the drill head, eccentric fluid jets or a combination of these, usually in conjunction with a locator.

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