Availability Analysis of Roofing Sheet Corrugating Equipment Using Statistical Technique

Abstract

This study investigated the availability of roofing sheet corrugating machines using statistical techniques in Charles Aluminium Nigeria Limited. Data on the failure frequency of the machine components (roll bearings, cutting device, machine motor, and de-coiler) for eight years (2014-2021) was acquired from the industry maintenance records. Statistical tools and probability approaches were adopted for analysis. It was revealed that the system's failure frequency developed to the maximum value in 2021. The minimum rate of roll failure failure in 2014 was 0.000504 per year, and the maximum was 0.00997 per year. The rate of failure of the cutting device was 0.00662 in a year. The machine's minimum and maximum failure rate due to de-coiler was 0.001008 per year and 0.00828 yearly, respectively. The degradation rate due to the system motor increased from 0.00504 per year to 0.00662 per year in 2020. The average reliability of roller bearings was 0.36788. The maximum reliability due to the cutting device was 0.367; the lowest reliability of the system due to the de-coiler was 0.000912/year; the maximum reliability of the system motor was 3.678×10^-1. In furtherance, the least mean time between failures of the system were: rollers, 100 hrs; cutting device, 151 hrs; de-coiler, 121 hrs; system motor, 151 hrs.