May 2016

Special Report: Maintenance/Reliability

Apply a short-term, high-temperature carbon steel solution to piping systems

Carbon steel (CS) piping and equipment are used extensively in refineries and petrochemical plants, where fluid temperatures vary from moderate to high for various processes.

Tiwari, V., Choudhury, M. G., Reliance Engineering Group (REG)

Carbon steel (CS) piping and equipment are used extensively in refineries and petrochemical plants, where fluid temperatures vary from moderate to high for various processes. The American Society of Mechanical Engineers (ASME) code B31.3 limits the use of CS material in piping systems operating up to a maximum temperature of 427°C, due to the conversion of carbides to graphite that may occur after prolonged exposure to temperatures above 427°C. Stress analysis of such systems becomes critical because the allowable stress values are much lower at temperatures above 427°C. In the hydrocarbon process industries (HPI), some systems will be exposed to temperatures above 427°C for a short durati

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