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27 August 2020
Horizontal directional drilling or HDD is a specialty service of DirectHitt. HDD is a non-destructive digging method for installing underground utilities such as pipes, conduits or cables. The HDD process uses a surface launch drill rig to create underground paths shaped as a shallow arc or radius. With the many advantages of HDD also comes a number of problems you could anticipate with contractors.
There are differences in soil types and densities that can affect the feasibility of conducting HDD. Gravel soils can often make HDD infeasible unless design and construction measures are put in place. It is important to understand the subsurface soil conditions prior to attempting HDD as significant unanticipated costs may arise from HDD failure in gravel soils. Conducting HDD in difficult soil types and densities is possible with adjusted pipeline alignments and mitigation techniques. HDD profiles are also useful to avoid risky subsurface soils along with planned underground paths.
Contractors need an understanding of pullback forces and operational stresses for effective planning and safety. Consideration of HDD profiles and pipeline alignments is crucial to reducing pullback forces for safe operation and to reduce stress to pipelines during HDD operation of horizontal or vertical paths. Understanding pullback forces and operational stresses prepares the contractor to choose the correct equipment to best complete the project.
HDD contractors may encounter damage to pipelines during the HDD process. HDD places extreme demands on pipeline coatings along with elevated risk of damage to the pipeline itself. As HDD installations are increasing, abrasion and gouging forces on pipelines are also increasing beyond the capabilities of conventional anti-corrosion pipeline coatings. Therefore, it is imperative that experienced HDD contractors are working on your project with an understanding of pipeline coatings.
Get in contact with the DirectHitt contractors to enquire about our horizontal directional drilling service available across Australia. Give us a call or complete our online contact form for a free personalised quote on your next project requiring underground planning.
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