Analisis Strategi Pengendalian Persediaan Suku Cadang: Studi Kasus di Sebuah Industri Pembangkit Listrik

Andini, Puti (2024) Analisis Strategi Pengendalian Persediaan Suku Cadang: Studi Kasus di Sebuah Industri Pembangkit Listrik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam mendukung kegiatan pemeliharaan peralatan di pembangkit listrik diperlukan adanya ketersediaan material pemeliharaan di waktu yang tepat serta mengetahui jumlah pembelian yang optimal agar kegiatan pemeliharaan dapat terselesaikan dengan baik. Nilai gudang untuk material cadang rutin mendominasi sebesar Rp7,8 miliar dan perlu dilakukan analisis pengendalian persediaan material di gudang untuk tipe tersebut agar tidak mengalami stockout maupun overstock. Dalam upaya pengendalian persediaan yang optimal perlu meminimalkan material deadstock dimana material tersebut seharusnya bergerak selama tidak lebih dari dua tahun. Terdapat risiko bahwa persediaan suku cadang akan menjadi usang jika tidak digunakan dalam waktu yang lama (deadstock). Suku cadang pada kelas terpilih berdasarkan hasil Analisis ABC dan Klasifikasi ADI – CV selanjutnya dilakukan percobaan dengan menghitung parameter berdasarkan kebijakan pengendalian persediaan yang sesuai dengan pendekatan model continuous review (s, Q) dan (s, S) serta periodic review (R, S) dan (R, s, S) menggunakan Simulasi Monte Carlo untuk menentukan jumlah yang harus dipesan, waktu pembelian, dan periode kontrol stok untuk meminimalkan total biaya persediaan maupun peningkatan service level. Uji sensitivitas dengan penyesuaian parameter (peningkatan dan penurunan parameter) untuk mengetahui perubahan dalam beberapa variabel input yang mempengaruhi hasil dari sistem dan juga untuk mengidentifikasi variabel yang paling berpengaruh terhadap output model tersebut. Hasil akhir dari simulasi menunjukkan total biaya persediaan optimal yang menjadi indikator performansi kebijakan pengendalian persediaan. Simulasi dilakukan pada 10 item terpilih dan didapatkan peningkatan service level dan penurunan total biaya persediaan. Hasil simulasi dengan model continuous review menghasilkan penurunan total biaya persediaan rata-rata sebesar Rp82.127.927 dan terjadi peningkatan sebesar 2,3% nilai service level. Sedangkan hasil simulasi dengan model periodic review menghasilkan penurunan total biaya persediaan rata-rata sebesar Rp93.088.330 dan terjadi peningkatan nilai service level sebesar 3%. Pada komponen dari peralatan kritis yang telah ditentukan dari penilaian tingkat kekritisan dilakukan analisis jumlah pembelian optimal menggunakan metode reliability age replacement dengan mencari interval optimal umur peralatan tersebut.
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To support equipment maintenance activities at power plants, it is necessary to have maintenance materials available at the right time and to know the optimal purchase amount so that maintenance activities can be completed properly. The warehouse value for routine spare materials dominates at IDR 7.8 billion and it is necessary to analyze material inventory control in warehouses for this type so that there are no stockouts or overstocks. To control optimal inventory, it is necessary to minimize deadstock material where the material should move for no more than two years. There is a risk that spare parts inventory will become obsolete if not used for a long time. Spare parts in the selected class are based on the results of ABC Analysis and ADI – CV Classification, then experiments are carried out by calculating parameters based on inventory control policies that are in accordance with the continuous review (s, Q) and (s, S) and periodic review (R, S) model approaches. and (R, s, S) uses Monte Carlo Simulation to determine the quantity to be ordered, purchase time, and stock control period to minimize total inventory costs and increase service levels. Sensitivity testing with parameter adjustments (increasing and decreasing parameters) to determine changes in several input variables that influence the results of the system and to identify the variables that most influence the model output. The results of the simulation show the optimal total inventory costs which are an indicator of the performance of inventory control policies. Simulations were carried out on 10 selected items and obtained an increase in service level and a decrease in total inventory costs. The simulation results using the continuous review model resulted in a decrease in total inventory costs on average of Rp82,127,927 and an increase of 2.3% in service level value. Meanwhile, the simulation results using the periodic review model resulted in a decrease in total inventory costs on average of Rp93,088,330 and an increase in service level value of 3%. For components of critical equipment that have been determined from the criticality level assessment, an analysis of the optimal purchase quantity is carried out using the reliability age replacement method by finding the optimal age interval for the equipment.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Analisis ABC, Continuous Review (s, Q) dan (s, S), Klasifikasi ADI – CV, Periodic Review (R, S) dan (R, s, S), Pengendalian Persediaan, Reliability Age Replacement, Simulasi Monte Carlo ============================================================= ABC Analysis, ADI – CV Classification, Continuous Review (s, Q) and (s, S), Periodic Review ((R, S) and (R, s, S), Inventory Control, Monte Carlo Simulation, Reliability Age Replacement
Subjects:	H Social Sciences > HD Industries. Land use. Labor > HD55 Inventory control
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User:	Puti Andini
Date Deposited:	01 Aug 2024 01:47
Last Modified:	01 Aug 2024 01:47
URI:	http://repository.its.ac.id/id/eprint/109365

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