Evaluation of Influence Factors of Compressive Buckling by FE Analysis

摘要

It is important to assess the strain capacity of line pipe in SBD (Strain Based Design). In case of compressive buckling, the Japan Gas Association guideline gives the allowable strain limit by the function of D/T regardless of pipe grade up to API X65 (Japan Gas Association, 2000). Application of API X80 grade line pipe has been promoted to increase operating pressure. The assessment of strain capacity of X80 SAW pipe is required for SBD. In addition to the pipe tensile property, pipe dimensions have to be taken into consideration for precise analysis of strain capacity. FEA (Finite Element Analysis) was employed to evaluate strain capacity of 610mm OD (Outside Diameter) X80 line pipe produced by UOE process. The essential factors, which influence strain capacity of X80 SAW pipe, are identified. The effect of internal pressure and thermal aging on compressive buckling is clarified.