In pneumatic DTH water well drilling, the drill pipe performs two jobs simultaneously: it acts as a structural drill-string component and as an air-delivery passage.
Compressed air flows through the DTH drill pipe to power the hammer at the bottom of the hole.
For this reason, internal diameter is an important specification.
A smaller internal passage can increase airflow resistance, particularly when the drill string becomes long.
The complete air system should consider:
The DTH hammer converts compressed air into impact energy.
If the air supply reaching the hammer is inadequate, hammer performance may decrease.
After operating the hammer, exhaust air helps transport cuttings toward the surface.
Effective cuttings removal helps:
Increasing wall thickness may improve certain structural characteristics but can reduce the internal flow area if the outside diameter remains unchanged.
Therefore, wall thickness should not be selected independently.
A larger internal diameter alone cannot solve an undersized compressor or unsuitable hammer configuration.
The pipe, compressor, hammer, bit, and borehole diameter must be evaluated together.
YKDRILL provides DTH drill pipes in multiple diameters and wall thicknesses for different water well drilling systems.
