Abstract
This paper deals with reliability–availability–maintainability (RAM) of the sheet manufacturing system of a steel industry. The system comprises of various subsystems viz. conveyors, extractor, furnace, de-scaling unit, roughing mill, Steckel mill, down coiler, and strapping machine. State transition diagram has been developed which depicts various states (fully operational/reduced capacity/failed) of the system. Chapman–Kolmogorov differential equations have been developed from this diagram using mnemonic rule. Mathematical analysis has been carried out using supplementary variable technique. Repair rate has been varied whereas failure rate has been kept constant. Meantime between failure and transient state availability of the system has been calculated using Simpson’s 3/8 rule and Runge–Kutta fourth order method (using MATLAB), respectively. The conclusions drawn may be helpful to the plant management in enhancing system performance by taking accurate and timely maintenance decisions.
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