Abstract
PT. X is an industrial company engaged in the production of pipes. In producing HDPE pipes, the company uses various raw materials ordered from foreign suppliers. The raw material needed in the HDPE pipe production process is HDPE plastic seeds. The company orders raw materials to meet existing demand, inventory stocks often experience differences with demand and orders are made if there is not enough supply to meet demand, Shipments of materials in containers via sea transport with a square off time of 1 month. In practice the number of orders is determined based on the number of requests in 1 month. In this study the method used is a simulation to determine the optimal HDPE raw material order quantity with total inventory cost (Total Cost Inventory) as a comparison, the order size determination is also carried out using the probabilistic EOQ method. The optimal order size with the Q system for a reorder point of 60,000 kg is 80,000 kg and a total inventory cost of 378,465,389, -.
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