Finite Element Simulation of Hoop Stress of High Grade Thick Wall Longitudinal Submerged Arc Welded Pipe during Hydrostatic Pressure Test

The hoop stress of high grade (X70) longitudinal submerged arc welded pipe with wall thickness of 32 mm during hydrostatic pressure test was simulated by finite element method and was computed using API SPC 5L, DNV-OS-F101 and mechanical engineer manual, and the computation results were compared with the simulation ones. The results show that the simulation results was correspondent with computation results for the same X70 steel pipe during hydrostatic pressure test, especially with the results of thick wall pipe computed using mechanical engineer manual, and the error of hoop stress on internal and external surface was 0.1% and 1.1%, respectively.