Research on Current and Potential Distribution of Horizontal Directional Drilling Pipeline

Abstract The Horizontal Directional Drilling (HDD) process represents a significant improvement over traditional cut and cover methods for installing pipelines beneath obstructions. However, cathodic protection monitoring at HDD locations is typically limited to the entry/exit extremities, with protection levels in the intervening span either assumed or speculated. In this essay, the theoretical calculation method of current distribution on HDD will be shared. The laboratory and field experiment results show that the soil resistivity is the main influencing factor of the cathodic protection current distribution of the HDD. This article also gives a test method for the effectiveness of cathodic protection of HDD.