PM4 SMP model proposed for system reliability criticality assessment and maintainability improvement

This paper gives a practical systematic approach towards the maintenance procedure optimisation of a critical industrial unit in operation, to improve its maintainability. The resolution of the maintainability challenge in the industrial unit (Vibrating screen unit - VSU) was realised by performing a two-phase critical analysis, encompassing criticality and maintainability assessment. The criticality assessment comprised of failure investigation using fault tree analysis (FTA), vulnerability analysis using reliability block diagram (RBD), and failure mode effect and criticality analysis (FMECA). Furthermore, a maintainability assessment was performed on the industrial unit and improvement opportunities were identified. A generic model (PM4 Model) was conceptualised and used to improve the mean time to repair (MTTR) through a well-documented standard maintenance procedure (SMP).