Determination of component categories using logic tree analysis

Abstract

Sterilizer machine plays important role in crude palm oil. Component machine has an important function to determine a maintenance based on the failure. Component failure is used to determine a correct maintenance. The problem faced by the company today is the high downtime of the sterilizer making machine causes the sterilizer production process to be disrupted. Machine breakdown around 35,66 hours/month. Machine failure analysis using the Failure Mode and Effect Analysis (FMEA) method and the Logic Tree Analysis (LTA) method. The LTA method used to determine priority to each failure mode and to review functions and malfunctions produce categories A (evident), B (safety), C (Economic Problem) and D (Hidden Failure) with the largest percentage for category B. The FMEA method analyse the factors causing component failure and its effect on overall system function by giving a Risk Priority Number value (RPN) based on severity, occurrence, and detection. The FMEA method produces the highest RPN values for 5 components namely IGBT, Mosfet, Bearing Bushing, Rool Former, and V-Block. LTA method shows that B Category has the largest percentage of component category. The result of this research is to categorize component failure and determine the Risk Priority Number for sterilizer machine.