Definition - What does Conductor Casing mean?
A conductor casing is the first and largest in diameter pipe installed in the bore. It extends 80-150 feet below the Earth's surface and is cemented throughout its full length. A conductor casing has two primary purposes. The first is to prevent unconsolidated sediments from entering the bore and the second is to prevent shallow groundwater, such as rainwater-based infiltration, from entering and contaminating the bore or interfering with the services or facilities placed within the bore.
Trenchlesspedia explains Conductor Casing
The conductor casing Is dependent on geotechnical reports for the area, its soil type, slope, soil consolidation factors related to the likelihood of rainwater infiltration. The type of utility to be installed in the bore is also taken into account, along with shallow groundwater levels, the depth and proximity of water wells, and other shallow hydrologic conditions.
A conductor casing may not be necessary in all circumstances, for example, in locations where the soil is well consolidated or well-drained, or where rainwater infiltration is not likely to be a problem.