Maxi-HDD Pull Loads for Entry and Exit Points at Different Elevations
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 6, Issue 3
Abstract
ASTM guidelines provide a procedure for estimating pull loads and stresses on polyethylene pipe as primarily a function of the drilled path and buoyant weight of the pipe in the drilled hole. The equations were initially developed assuming a level grade or that the horizontal directional drilling (HDD) entry and exit elevations are the same. In practice, however, it is not uncommon that there would be a finite grade or difference in elevation between the entry and exit points of the drilling operation. The equations and methodology have been expanded to address the placement of polyethylene pipe for the case of a nonlevel grade, including the installation of pipe with and without antibuoyancy measures. The theoretical model and associated results were primarily based on a particular generic borehole geometry, recognizing that specific trends and conclusions may differ somewhat for other possible bore paths. This paper therefore investigates an alternate generic geometry for traversing different entry and exit elevations, representing a reasonable bore path in many practical applications. The results help provide a better understanding of the factors influencing the pull loads in the maxi-HDD installation of pipelines.
Get full access to this article
View all available purchase options and get full access to this article.
References
Slavin, L. M., Najafi, M., and Skonberg, E. R. (2011a). “Maxi-HDD pull loads for nonlevel grade for polyethylene pipe.” J. Pipeline Syst. Eng. Prac., 64–69.
Slavin, L. M., Najafi, M., and Skonberg, E. R. (2011b). “Maxi-HDD pull loads in non-level grade for polyethylene pipe including ballast.” Proc., Pipelines 2011, ASCE, Reston, VA.
Information & Authors
Information
Published In
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 17, 2011
Accepted: Mar 7, 2013
Published online: Mar 9, 2013
Discussion open until: Jul 18, 2014
Published in print: Aug 1, 2015
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.