Hafiz Abdul Ahad Qazi
Abstract
High pressure line pipes are widely used in oil and gas sector for the transportation of natural gas, oil and other petroleum products. Line pipe experiences high operating pressures in gas transportation that ranges from 200 to 1600 PSI depending on the size and length of the line pipe. For the safety point of view, to check integrity of line pipe and before getting the line pipes used in the field, Hydrostatic test is used for verifying mechanical integrity of pipe lines and is applied to check for leakages during hydrostatic testing. Burst test aims to evaluate the point of failure of the line pipe and assess the structural integrity of a welded pipe. In present work, an experiment research work is carried out to confirm weld and structural integrity of two API 5L PSL 2 X70 grade pipes manufactured by Helical submerged arc welding pipe mill. Burst tests are conducted at pressure in excess of the Ultimate tensile strength of the steel pipes and aimed to sustain the pressure as per API requirement. Both the pipes achieved the expected results.