E.C. Obinabo, C.U. Ochonogor, On the Performance Assessment of a Class of Industrial Fans with Substantial Process Variability for On-Condition Monitoring and Control System Design, International Journal of System Signal Control and Engineering Application, Volume 2,Issue 3-4, 2009, Pages 40-44, ISSN 1997-5422, ijssceapp.2009.40.44, (https://makhillpublications.co/view-article.php?doi=ijssceapp.2009.40.44) Abstract: This study presents a statistical quality control study for on-condition monitoring of draught fans in a steelmaking process. The study proposes a procedure for obtaining consistent estimates of peak vibration levels for performance assessment the machines based on independent measurements of the variable assuming the time between successive occurrences of the peak vibration were distributed with a probability density function. Keywords: experimental design and modelling;probability density function;Statistical quality control;vibration monitoring;machine;Nigeria