50% larger than pipe diameter to enable easy pull-through of the pipe string. Sometimes several passes may be required before the desired bore diameter is achieved. The second stage involves attaching a reamer of approximately the same size as the product pipe to the end of the drill string after removing the drill bit and pulling it back to the entry point. When the drill string reaches the exit point, the second stage is initiated. The pilot hole is approximately 1 to 5 inches in diameter along the proposed centerline of pipe alignment. The first stage involves drilling a pilot hole using a steerable guided drill along a planned path. After reaming is completed, the pipe is pulled in through the hole. The HDD method consists of two main stages, i.e.
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