RELIABILITY IMPROVEMENT OF HYDRAULIC STEERING CYLINDER OF LHD MINING EQUIPMENT (CASE STUDY: PT FREEPORT INDONESIA)

• Main Author: RUDY IRNANTO 29115301 , ANDIK
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21047
• Institution: Institut Teknologi Bandung

PT Freeport Indonesia (PTFI) is a mining company operating in Papua province, <br /> <br /> Indonesia, producer of copper and gold and have a plan to shut down the open pit <br /> <br /> (Grasberg) in 2018 then will focus on underground mine. Deep Ore Zone (DOZ) is one <br /> <br /> of underground mine area which character is muddy rock which have potential can be <br /> <br /> landslides and jeopardize the safety of employees in the area. To achieve safe mining <br /> <br /> process then PTFI apply the MINEGEM system that is an underground automation <br /> <br /> system. This system designed to enhance safety and boost operator efficiency and <br /> <br /> effectiveness in underground mining operation because it is a system for controlling <br /> <br /> underground machine remotely so it can reduce the risk of workplace accidents in the <br /> <br /> DOZ area and this system allows an underground machine can operated from the surface. <br /> <br /> The MINEGEM system have installed on several Load Haul Dump (LHD) machines <br /> <br /> because it deals with the machine’s function of loading and transporting ore from danger <br /> <br /> area. <br /> <br /> LHD equipment is one of the heavy equipment to support underground mining activities <br /> <br /> have an issue about low reliability of hydraulic steering cylinder since last two years with <br /> <br /> average reliability was 26.7% of target and the reliability gap was 58.3% with potential <br /> <br /> loss USD 507K/Year. <br /> <br /> By focus group discussion to analysis the root cause of problem then using Current <br /> <br /> Reality Tree (CRT) to determine the common root cause then continue using Failure <br /> <br /> Mode and Effect Analysis (FMEA) to rank the root cause then identify which root causes <br /> <br /> has the highest risk value. Applied Failure Analysis (AFA) used to determine the root <br /> <br /> cause of damaged steering cylinder more specific by technical approach. <br /> <br /> Analytic Hierarchy Process (AHP) used to determine the best solution of several solutions <br /> <br /> that will implemented to improve the reliability of hydraulic steering cylinders of LHD <br /> <br /> equipment and the reengineering design by fabricate guard to protect steering cylinder is <br /> <br /> chosen to eliminate the damaged steering cylinder caused of hit by the rocks. By <br /> <br /> implementing fabricate guard protection, it will increase reliability become 55.9% and <br /> <br /> potential loss will reduce become USD 359K/Year. <br /> <br /> The implementation plan shall perform by all stakeholders, including monitoring the <br /> <br /> progress and output of the project.