Cost Reductions Through Life Cycle Improvements

This technical report discusses the significant maintenance challenges faced by a 160-inch plate mill's descaling pumps, which had a mean time between repairs of only 6 to 8 months. The report outlines a series of improvements implemented over several years to enhance the pumps' reliability and performance. It begins with a Root Cause Analysis-Rotor Condition Analysis to identify the underlying issues affecting the pumps, including high noise levels, vibration, and wear. The report details a phased approach to upgrades, addressing system, mechanical, material, and hydraulic problems. Key improvements included the addition of a water filtration system, tighter pump clearances, dynamic balancing of rotors, and the use of advanced materials for wear components. The report concludes with a cost analysis, demonstrating that the upgrades extended the pump life cycle from approximately 8 months to 60 months, resulting in substantial cost savings for the mill. Overall, the enhancements led to improved reliability and product quality.