FAILURE ANALYSIS OF PIPES IN A CONSTRUCTION

Abstract

The high working pressure, temperature, and corrosivity of the fluid flowing in the pipe cause problems in pipe failure in operation. The purpose of the analysis is to obtain information related to working conditions at pressure, temperature, and fluid corrosivity, causes of failure, initial cracking of materials, and types of materials used in a construction. The analysis method includes tracing the results of previous pipe research, studying mechanical properties, composition, hardness, stress concentration, fluid corrosivity, heat treatment, comparison between results, discussion and conclusions. Application of pipe analysis in a construction of production facilities, and factories. The conclusions obtained include: rupture of coal boiler pipes at 1100°C, tensile strength of 48.2 MPa with fluid at 730°C; dezincification and deposits with sulfur content of ~0.60 wt%, and Cl ~9.45 wt% which are corrosive; exposure to hydrogen sulfide concentrations up to 1000 ppm, the presence of localized pitting corrosion due to chloride attack up to 88 °C; erosion rate of 26.77 mm/year and corrosion rate of 1.107 mm/year causing thinning of the elbow wall of 20# steel pipe, diameter 600 mm, thickness 10 mm; working pressure of diesel engine fuel pipe at 637.5 MPa or 63.8 Bar; and so on