Monitoring of HDPE Pipe during Horizontal Directional Drilling Installations

This paper presents the results of three field installations of high-density polyethylene (HDPE) using the Horizontal Directional Drilling (HDD) process. One each of 114 mm (4 in.) diameter standard dimension ratio (SDR) 17 HDPE pipe, 219 mm (8 in.) diameter SDR 17 HDPE pipe, and 324 mm (12 in.) diameter SDR 17 HDPE pipe were installed in a cohesionless soil medium. Various testing parameters were captured during the pullback phase of these three installations. These testing parameters consisted of utilizing pressure transducers to capture the pullback and rotational pressures on the drilling rig, linear potentiometers installed inside the HDPE pipe to measure the axial strain on the pipe, and the application of an external load cell to quantify the loading on the pipe during the pullback phase. Comparisons of the pullback and rotational pressure on the drilling rig, loading on the HDPE pipe, and average and maximum strain experienced by the HDPE pipe are presented with respect to the installed pipe diameter.