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Ajeng Tri Rahayu
Universitas Muhammadiyah Gresik

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The ANALISIS KEANDALAN CONVEYOR BELT DI AREA NPK2 PT. X BERDASARKAN DATA KERUSAKAN DAN WAKTU OPERASI M.Zakarsyi Lilma Abid; Alviani Hesthi Permata Ningtyas; Ajeng Tri Rahayu
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

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Abstract

Conveyor systems play an important role in supporting material handling processes in the fertilizer industry. Continuous operation under high workloads can lead to component wear, increased failure frequency, and downtime that disrupts production continuity. These conditions highlight the need for reliability evaluation to ensure optimal conveyor performance. This research analyzes the reliability of the conveyor system at NPK Plant 2 of PT. X using historical maintenance data collected from July 2024 to June 2025. The analysis was conducted using reliability parameters, including Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR), Availability, Failure Rate, and Reliability. In addition, Failure Mode and Effect Analysis (FMEA) was applied to identify critical components and determine maintenance priorities based on the Risk Priority Number (RPN). The results indicate that most conveyor units exhibit high availability and reliability; however, several units still experience relatively high downtime and repair duration. The conveyor belt component shows the highest RPN value and therefore requires priority attention in maintenance activities. Implementing more effective preventive maintenance and enhanced monitoring of critical components is expected to reduce downtime and improve the reliability and operational efficiency of the conveyor system.
A ANALISA KINERJA LOW PRESSURE HEATER (LPH) BERBASIS STANDAR ASME PTC DI PLTU UP GRESIK Moch Afifur Rosikh; Alviani Hesthi Permata Ningtyas; Ajeng Tri Rahayu
ENIGMA: Engineering in Green Machinery Vol. 2 No. 2 (2025): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/enigma.v2i2.11002

Abstract

Steam Power Plants (PLTU) have an important role in providing reliable electrical energy for the community and industrial sector. One of the components that affect the thermal efficiency of the generating system is the Low Pressure Heater (LPH), which functions to heat feed water using heat from turbine extraction steam. This study was conducted at LPH 4 Unit 4 at PT PLN Nusantara Power UP Gresik with the aim of assessing the performance of the equipment based on the ASME PTC 12.1 standard, through the analysis of three main parameters, namely Terminal Temperature Difference (TTD), Drain Cooler Approach (DCA), and Temperature Rise (TR). The method used is quantitativedescriptive with operational data collection from July to August 2025. The results of the analysis show that the actual TTD value is much higher than the commissioning value, which indicates a decrease in the effectiveness of heat transfer. Meanwhile, the DCA and TR values are still close to the commissioning value so that the condensate heating and cooling process can be said to be running efficiently. The decline in performance in TTD is thought to be influenced by the age of the LPH, variations in operating loads, and suboptimal data collection patterns. These findings provide important input for PLTU managers in improving system reliability and efficiency through regular maintenance and optimizing performance monitoring methods.
Co-Authors Alviani Hesthi Permata Ningtyas M.Zakarsyi Lilma Abid Moch Afifur Rosikh