OPTIMALISASI ANGLE STUCTURAL DENGAN METODE EOQ DAN POQ PADA GALANGAN KAPAL SURABAYA

Abstract

The shipbuilding company at Ujung Surabaya requires raw aluminium material to carry out its
operational activities. However, in 2021 the shipyard company experienced a stockout of raw aluminum
material of 152 units of structural angle material, 41 units of bar metal, 31 units of elbow, 33 units of
pipe, 36 units of plate metal, 28 units of raceway, and 37 units of sheet metal. This resulted in delays in
procurement activities for the KCR5 project which should have been 557 days to 635 days. Therefore, the
purpose of this final project is to get the optimal number of orders and purchase frequency and to get the
total cost of raw material inventory that is more efficient for the company. This study uses the Economic
Order Quantity (EOQ) and Periodic Order Quantity (POQ) methods to calculate the number of economic
orders, safety stock, reorder points and optimal frequency, then uses the Total Annual Cost (TAC)
calculation to calculate the inventory costs to be incurred. The objects in this study are 17 materials
consisting of structural angle materials, pipes, plate metal, and sheet metal. The results of the study
obtained the optimal number of orders, reorder points, and safety stock values to anticipate raw material
shortages and obtained the total annual cost of the proposed EOQ method which could save 7,64% of the
total annual cost of the company's policy.