The International Society for Trenchless Technology
Glossary
There are 211 entries in this glossary.| Term | Definition |
|---|---|
| Walkover System |
See Locator |
| Washover pipe |
A pipe inserted in the borehole to stabilize the hole when using small diameter drill string, when recovering a stuck drill pipe, or when retracting a drill string to change bits or to re-tool. Washover pipes may also be used to stablilize the bore when drilling in difficult unstable formations. |
| Water Jetting |
Internal cleaning mechanism of the cutterhead in which high-pressure water is sprayed from nozzles to help remove cohesive soils. |
| Wireline |
Surface system consisting of a grid of energized wire coil, which in combination with a downhole survey probe, tracks the location of the drill string. |
| Working Shaft |
A general term applied to the more specific description of thrust or reception pits. |
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Thematic words
trenchless technology involves installation replacement renewal underground utilities minimum excavation surface disruption several construction techniques methods details technologies successfully water sewer industrial pipelines electrical conduit fiber optics particularly attractive option urbanized heavy pedestrian traffic numerous existing crossing roadways other transportation corridors rivers waterways install rehab replace located environmentally sensitive areas