Horizontal Directional Drilling (H.D.D.)

Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trechless method of installing underground pipes, conduits and cables in a shallow arc along aprescribed bore path by using a surface launched drilling rig, with minimal impact on the surrounding area. Directional boring is used when trenching or excavating is not practical. Directional boring minimizes environmental disruption. It is suitable for a variety of soil conditions and jobs including road, landscape and river crossings. Installation lengsths up tı 6.500'(2,000m) have been completed, and diameters up to 56" (1,200mm) have been installed in shorter runs. Pipes can be made of materials such as PVC, polyethylene, Ductile iron, and steel if the pipes can be pulled through the dirlled hole.