The Difference Between Down-the-Hole Drill Pipe and Top Hammer Drill Pipe
DTH Drill Pipes vs. Top Hammer Drilling Pipes Down-the-hole (DTH) drilling and top hammer drilling are two common methods used in the mining, quarrying, and construction industries for drilling holes in rocks and other hard materials. The main difference between them lies in the position of the drilling mechanism and the type of drill pipe used. 1. Down-the-Hole Drill Pipe : Down-the-hole drilling, also known as DTH drilling, involves a drilling mechanism located at the bottom of the drill string. The drill bit is placed at the end of the drill pipe, and a percussion hammer mounted above it delivers powerful blows directly to the bit. The drill bit rotates while simultaneously hammering into the rock, creating a hole. DTH drill pipes are generally heavier and longer compared to top hammer drill pipes. They are designed to withstand the high impact forces generated by the percussion hammer and the weight of the drill string. DTH drilling i...