Screw Press Failure Risk Analysis Using FMEA at PT SISIRAU Pressing Station

Dewiyana; Ryan Pramanda; Ariel Pradana

Authors

Dewiyana Universitas Samudra
Ryan Pramanda Universitas Samudra
Ariel Pradana Universitas Samudra

Keywords:

Failure Mode and Effects Analysis (FMEA), Risk Priority Number (RPN), Preventive Maintenance, Screw Press, Palm Oil

Abstract

The screw press is a critical machine in crude palm oil (CPO) extraction, and its failure may reduce production efficiency and increase oil losses. This study identifies failure modes in screw press components, examines their causes and effects, and prioritizes preventive maintenance using Failure Mode and Effects Analysis (FMEA). Data were obtained from field observations, interviews with three personnel, and company records at the PT SISIRAU palm oil mill. Six components were assessed: the worm screw, press cage, bearing, hydraulic system, main shaft, and electric motor. The worm screw had the highest Risk Priority Number (RPN) of 196, followed by the press cage (168) and bearing (126). The principal contributing factors included heavy operating loads, continuous friction, inadequate lubrication, and foreign materials entering the pressing system. Recommended preventive measures include routine inspection, installation of a magnetic separator, scheduled lubrication, condition monitoring, and timely component replacement. These recommendations are intended to reduce failure risk and support reliable, continuous CPO production.

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