การปรับปรุงการควบคุมวัสดุคงคลัง กรณีศึกษาบริษัทฮัลลิเบอร์ตัน เอ็นเนอร์จี เซอร์วิสเซส สาขาสงขลา

Abstract

This research has the objective to improve raw material inventory system. The problem found that some of materials inventory was sometime higher or lower than demand. Therefore, this study proposes an appropriate inventory management system. The methodologies for solving this problem were as followings. Firstly, ABC analysis technique was used to classify raw materials in the stock into 3 groups A, B and C. The inventory problem was under uncertain demand. Continuous review system and (Q, R) model were choose to develop simulation model to find the best of order quantity and appropriate reorder point. The target is to minimize inventory management cost. After that, simulate (Q, R) model by using @RISK and RISKOptimizer program. The result from simulation for 21 items has shown that the average total inventory cost is 1,163,899 baht per year. If we compare with current method which has total inventory cost 1,486,766 baht per year. The total inventory cost will be reducing about 322,867 baht or 21 % reduction of the existing method.