The permanent ground displacements are among the major destructive factor of lifelines. The buried pipelines are elongated structures that due to their length, pass through different geological complications. For instance, they may pass through fault regions and consequently be endangered by the deformations induced by faulting. The investigation of the behavior of these lifelines subjected to the destructive phenomenon of faulting is seriously important. In this study the behavior of polyethylene pipelines crossing strike slip faults has been evaluated. The pipe is modeled by shell elements and the surrounding soils are modeled by three-dimensional continuum elements. In order to consider the nonlinear stress-strain behavior of polyethylene, the hyper elastic-plastic constitutive model is employed for this material. The comparison of the numerical results with experiments indicate that the numerical results are in good accuracy. A parametric study is performed to investigate the effects of different parameters on the behavior of pipeline including the burial depth, the pipeline thickness and diameter and the friction angle of soil.