A pipeline is considered as shell structure so its design is based on stability concepts due to the exerted high pressure, local instability is probable to occur and so prevention of its occurrence and propagation are important subjects in its design. In this paper, dynamic buckle propagation has been modeled by 3D finite element method, results are verified with experimental tests and velocity of dynamic buckle propagation is calculated for pipes with different diameter to thickness ratios. Due to the effect of velocity in designing of marine pipelines, separate relations based on the initiation pressure are derived for the velocity of propagation and the influence of diameter to thickness ratio on the propagation velocity is studied.

This study investigated buckling of steel cylinders in otherresearches. Here by using MATLAB software,aprogram to buckling pressure rangeof steel cylindrical shell under external pressure is provided. By comparing the output results and analysis charts, the risk of buckling in the cylinders can be detected with very good accuracy. After determining the proper correlationto predict buckling, hydrostatic pressure testing system with record pressure and volume changes for online registration prepared. In order to prevent suddenly destruction, buckling test equipment withvolume control method has been prepared andthe hydrostatic pressure tests were carried out on specimens of steel.So from overall load which make buckling will be prevented.By this method, prediction of buckling pressure and prevention of samplesdestruction can be done with about 16% error.