USULAN TATA LETAK MATERIAL DAN PERLUASAN GUDANG PADA PROYEK PEMBANGUNAN BENDUNGAN TIU SUNTUK PAKET 1 MENGGUNAKAN METODE CLASS BASED STORAGE

Abstract

PT Nindya Karya is a state-owned enterprise (SOE) engaged in construction services, currently undertaking the development of the Tiu Suntuk Dam project located in West Sumbawa Regency, Indonesia. Based on field observations, it was found that the existing warehouse layout was disorganized, with material placement lacking clear structure, thereby hindering warehouse staff in locating and retrieving required items. Additionally, due to limited storage capacity, not all materials could be accommodated within the warehouse. This condition prompted the need for further study to minimize material damage and inefficiencies in retrieval processes caused by poor organization. This study aims to improve warehouse capacity and layout by implementing the Class-Based Storage method, which categorizes materials into three main classes based on their type and dimensions. As a result, the warehouse was expanded from its original size of 4.7 m × 10.6 m to 14 m × 32 m. The proposed layout organizes materials into three classes: Class 1 comprises solid materials with lengths ranging from 3 to 12 meters; Class 2 includes solid materials shorter than 3 meters; and Class 3 consists of liquid or flammable materials. The analysis showed that the total material handling cost in the initial layout was Rp 2,246,674, which was reduced to Rp 1,068,060 in the proposed layout, indicating a cost efficiency gain of 52.4%. These findings confirm that the Class-Based Storage method is effective in optimizing warehouse layout and reducing internal logistics costs. The study offers practical contributions to warehouse management in construction projects and may serve as a reference for the layout planning of similar infrastructure facilities.