Simulation of lifting large diameter pipelines in horizontal directional crossing

Abstract:

During hoisting of the pipeline in horizontal directional drilling, the hoisting point on the pipeline determines the entry angle into ground. If the entry angle is too large or too small, it may cause either sticking or collapse of the pipeline. Through the simulating analysis for the influence of the entry angle and the lifting point during the lifting process, it is obtained that with the distance between the lifting point No.2 and the front end of the pipeline at 10m, when the entry angle is 10°, the allowable space between the two lifting points is 22～28m; when the entry angle is 12°, the allowable space between the two lifting points is 28～36m; when the entry angle is 14°, the allowable space between the two lifting points is 30～36m. In such a way, the pipeline is in a safe state during the lifting process. When the entry angle exceeds 16°, the pipeline stress exceeds its yield stress; thus, the entry angle should not exceed 16°.

Key words:directional horizontal crossing; hoisting large diameter pipelines; lifting point; entry angle