Electronic Theses and Dissertation

Perumdam Tirta Daroy merupakan perusahaan daerah yang bergerak di bidang penyaluran air bersih wilayah Kota Banda Aceh. Proses produksi air bersih menggunakan bahan kimia Poly Aluminium Chloride (PAC) powder dan kaporit powder. Pengendalian persediaan bahan kimia PAC powder dan kaporit powder penting dilakukan agar tidak terjadi overstock dan pemborosan biaya persediaan. Penelitian ini bertujuan untuk meramalakan permintaan bahan kimia PAC powder dan kaporit powder menggunakan simulasi Monte Carlo serta melakukan pengendalian persediaan bahan kimia menggunakan metode Heuristic Silver Meal. Peramalan permintaan dilakukan berdasarkan data permintaan bahan kimia periode Januari hingga Desember 2024 menggunakan simulasi Monte Carlo. Hasil peramalan dinyatakan efektif dengan MAPE pada PAC powder dan kaporit powder sebesar 15%. Hasil perhitungan metode Heuristic Silver Meal menghasilkan jadwal pemesanan bahan kimia PAC powder dilakukan 12 kali dalam satu tahun dan kaporit powder dilakukan 8 kali dalam satu tahun. Total biaya persediaan dengan metode Heuristic Silver Meal selama satu tahun pada PAC powder sebesar Rp180.000.000 yang menghasilkan penghematan sebesar 61% dibandingkan perhitungan aktual perusahaan. Sedangkan perhitungan Heuristic Silver Meal pada kaporit powder menghasilkan total biaya persediaan sebesar Rp26.175.600 yang lebih tinggi dibandingkan aktual perusahaan. Banyaknya safety stock yang harus dimiliki perusahaan adalah 5.769 kg PAC powder dan 119 kg kaporit powder setiap periode. Reorder point dilakukan pada saat stok PAC powder tersisa 15.913 kg dan kaporit powder sebesar 398 kg.

Kata kunci : Kaporit, Pengendalian, Heuristic Silver Meal, Persediaan, Poly Aluminium Chloride, , Reorder Point, Safety Stock, Simulasi Monte Carlo

Perumdam Tirta Daroy is a regional company engaged in the distribution of clean water in the Banda Aceh area. The clean water production process uses Poly Aluminium Chloride (PAC) powder and calcium hypochlorite powder as chemical materials. Inventory control of PAC powder and calcium hypochlorite powder is important to prevent overstocking and excessive inventory costs. This study aims to forecast the demand for PAC powder and calcium hypochlorite powder using Monte Carlo simulation and to manage the inventory of these chemicals using the Heuristic Silver Meal method. Demand forecasting was carried out based on the demand data for the period of January to December 2024 using Monte Carlo simulation. The forecasting results were found effective, with a MAPE of 15% for both PAC powder and calcium hypochlorite powder. The results of the Heuristic Silver Meal method calculation indicate that the ordering schedule for PAC powder 12 times in one year and calcium hypochlorite powder 8 times in one year. The total inventory cost using the Heuristic Silver Meal method for one year of PAC powder is Rp180,000,000, which represents a 61% saving compared to the company’s actual calculation. Meanwhile, the Heuristic Silver Meal calculation for calcium hypochlorite powder results in a total inventory cost of Rp26.175.600, which is higher than the company’s actual. The amount of safety stock that the company must maintain is 5.769 kg of PAC powder and 119 kg of calcium hypochlorite powder in each period. The reorder point is set when the PAC powder stock reaches 15.913 kg and calcium hypochlorite powder reaches 398 kg. Keywords : Calcium Hypochlorite, Control, Heuristic Silver Meal, Inventory, Monte Carlo Simulation, Poly Aluminium Chloride, Reorder Point, Safety Stock