Prediction of the burst pressure for defective pipelines using different semi-empirical models

Abstract

The main aim of this work is to predict the theoretical burst pressure of defective pipelines using different semi-empirical models and compare them with the hydrostatic test results. A new methodology was formulated with accounting for a minimum thickness (weakest section of the pipe) over the length of the pipe to predict the most conservative burst pressure. With a simple analytical expression, a reasonable accuracy and more conservative burst pressure can be obtained for any arbitrary defect shapes. A variation of burst pressure was found between theoretical prediction and hydrostatic burst test results with respect to the different semi-empirical models even for the same corroded defects. Different defect geometry shape and pipe material conditions are the possible causes for variation in the burst pressure between the semi-empirical models, so a careful selection of these parameters is necessary. The proposed methodology predicted a more conservative burst pressure for all arbitrary defects shapes and can predict reasonably accurate values if it accounts for the axial stress.

Strength Performance Evaluations of Vehicle Cylindrical LPG Tanks

“…The BP values of shallow spherical and torispherical caps [16], steel toriconical shells [17], and large diameter-to-thickness ratio thinwalled steel cylinders [18] were computed using both experimental and numerical studies. The BP of pipelines [19], strain distributions and the BP [20], and explosion burst tests [21,22] of the pressure cylinders were calculated analytically. The BP [23] and fracture failures [24] of the LPG cylinders were studied.…”

Numerical prediction of the ductile damage for axial cracks in pipe under internal pressure

“…The mixture of oil and natural gas coming out of a well must be transported as two-phase flow by pipelines to processing facilities before the oil can be separated from the gas. The fracture prediction and the reliability of such piping systems in various practical applications are primordial given their impact on the economic plan and security [1][2][3][4]. Several authors have been studied pipe fracture problems by means of numerical simulation in order to assess the mechanical integrity, taking into account different crack shapes [5][6][7].…”