4 Horizontal Directional Drilling Available to Purchase

The horizontal directional drilling (HDD) process represents a significant improvement over traditional cut and cover methods for installing pipelines beneath obstacles that warrant specialized construction attention. In order for these advantages to be realized, creative engineering must be applied in advance of construction. Design engineers should have a working knowledge of the process in order to produce designs that can be efficiently executed in the field. This chapter describes the fundamentals involved in designing a drilled installation as well as contractual and construction monitoring considerations. Topics covered include site investigation, drilled path design, temporary workspace requirements, drilling fluids, pipe specification, contractual considerations, and construction monitoring.