Component Replacement Planning for the Digester and Screw Press Machine at PT SMART Tbk Padang Halaban Mill

Valeriesa, Trivia Arneld (2023) Component Replacement Planning for the Digester and Screw Press Machine at PT SMART Tbk Padang Halaban Mill. Diploma thesis, Universitas Andalas.

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Abstract

PT SMART Tbk Padang Halaban Mill (PHLM) is one of the palm oil mills owned by PT SMART Tbk which is engaged in the processing of Fresh Fruit Bunch (FFB) into Crude Palm Oil (CPO) and Palm Kernel (PK) with production capacity as 60 tons/hour. Machine failures when the machine is operating which causes PHLM to have to carry out corrective maintenance still often occur, especially on digester machines and screw press machines. Therefore, this research aims to obtain a preventive replacement plan that can minimize downtime. There are two methods used in this research. The first method is Optimal Preventive Replacement Age to Minimize Downtime which is used to determine the optimal component replacement time with the aim of minimizing machine downtime. The second method is Time-Based Modularity Design which is used to group components that have the closest optimal replacement time into one component replacement module. Based on the research conducted, it was found that the longest replacement time is for the shaft component on screw press machine number 6 as 4400 hours. Meanwhile, the shortest replacement time is the adjusting cone bolt for 240 hours. There are three modules on machines number 1, 2 and 3, one module on machine number 4, and there are two modules on machines number 5 and 6. The reductions in downtime on screw press and digester machines number 1, 2, 3, 4, 5 and 6 respectively by 47.17%, 31.23%, 41.05%, 37.40%, 44.79%, and 42.96%. Overall, the downtime reduction for all the screw press and digester machine is 40.83%.

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