Failure Analysis of Oil Pipe Fracture in Steam Turbine Oil Supply System of Power Plant

Abstract Oil pipe fracture of the steam turbine oil supply system of a thermal power plant is carried out by macro inspection, spectral analysis, metallographic analysis, hardness analysis, and scanning electron microscope analysis. The results show that the fractured tubing is a fatigue fracture, and the source of the crack is the fatigue crack formed by the stress concentration of the weld, which eventually leads to the fracture and leakage at the place.