Effective management of material supply costs is essential to ensure the success of the project

Oct 13, 2025 by wbrum.org 77 views

Optimization of Concrete Iron Supply Costs: Comparing the LTC and POQ methods on the Kuala Tanjung railroad bridge project

Infrastructure development projects, such as railroad bridges, involve various complex aspects that require careful planning and efficient management of resources. One crucial aspect in the construction project is material supply management. The cost of material supply, especially concrete iron, is a significant factor that affects the total cost of the project. Effective management of material supply costs is essential to ensure the success of the project.

In this context, the Least Total Cost (LTC) method and Period Order Quantity (POQ) approach are two methods that can be used to optimize the cost of concrete iron supply. The LTC method is an approach that aims to minimize the total costs associated with material supply, taking into account the cost of ordering, storage costs, and material shortage costs. The POQ method, on the other hand, combines the concept of Economic Order Quantity (EOQ) with a discrete ordering period approach, aiming to determine the optimal number of orders for each certain period, taking into account factors such as demand and storage costs.

Case Study: Railroad Bridge Construction Project in Kuala Tanjung - North Sumatra

A case study on the railroad bridge construction project in Kuala Tanjung - North Sumatra analyzed the optimization of the cost of concrete iron supply using the LTC and POQ methods. The analysis showed that the LTC method produced a total cost of concrete iron supply of Rp. 613,796,088, while the POQ method produced a total cost of Rp. 613,845,288. The difference between the two methods is not significant, only the difference of Rp. 49,200. It is essential to note that these results are obtained based on project-specific data and assumptions used in the analysis.

As a comparison, based on Purchase Order (PO) in the field, the total cost of concrete iron supply reaches Rp. 614,262,590.2. This shows that the application of the LTC and POQ methods is able to produce savings of Rp. 417,302.2.

Benefits of Applying the LTC and POQ Method

The application of the LTC and POQ method has several benefits, including:

Penghematan Biaya (Cost Savings): The LTC and POQ methods can help minimize the total cost of concrete iron supply by optimizing the number of orders and ordering time.
Efisiensi Operasional (Operational Efficiency): The application of the LTC and POQ methods can improve operational efficiency by minimizing material stockpiling and shortages.
Perencanaan yang Lebih Baik (Better Planning): The LTC and POQ methods provide a strong basis for more accurate and effective material supply planning.

Recommendation

Based on the analysis, the following recommendations are made:

Melakukan Analisis Sensitivitas (Sensitivity Analysis): Conduct a sensitivity analysis to evaluate the impact of key factors such as demand, storage costs, and ordering costs on the total cost.
Combining LTC and POQ Methods with Integrated Inventory Management Systems: Combine the LTC and POQ methods with more integrated inventory management systems to achieve more optimal results.
Perform Periodic Evaluations: Perform periodic evaluations of the performance of the LTC and POQ methods to ensure their effectiveness in the long run.

Conclusion

The application of the LTC and POQ method on the railroad bridge construction project in Kuala Tanjung shows a significant potential in optimizing the cost of concrete iron supply. Although the two methods produce relatively the same total costs, the LTC and POQ methods have better advantages and planning compared to the PO method in the field. The LTC and POQ methods can be used as a valuable tool for material supply management in infrastructure development projects.

Future Research Directions

Future research can focus on:

Developing a more comprehensive model: Developing a more comprehensive model that incorporates the LTC and POQ methods with other inventory management techniques.
Applying the LTC and POQ methods in different industries: Applying the LTC and POQ methods in different industries to evaluate their effectiveness and adaptability.
Evaluating the impact of uncertainty: Evaluating the impact of uncertainty on the LTC and POQ methods and developing strategies to mitigate its effects.

By optimizing the cost of concrete iron supply, infrastructure development projects can achieve significant cost savings and improve their overall efficiency. The LTC and POQ methods provide a valuable tool for material supply management, and their application can lead to better planning and operational efficiency.
Frequently Asked Questions (FAQs) about the Least Total Cost (LTC) and Period Order Quantity (POQ) Methods

The Least Total Cost (LTC) and Period Order Quantity (POQ) methods are two popular approaches used in material supply management to optimize the cost of concrete iron supply. In this article, we will answer some frequently asked questions about these methods to provide a better understanding of their application and benefits.

Q: What is the Least Total Cost (LTC) method?

A: The LTC method is an approach that aims to minimize the total costs associated with material supply. It takes into account the cost of ordering, storage costs, and material shortage costs.

Q: What is the Period Order Quantity (POQ) method?

A: The POQ method is a method that combines the concept of Economic Order Quantity (EOQ) with a discrete ordering period approach. It aims to determine the optimal number of orders for each certain period, taking into account factors such as demand and storage costs.

Q: What are the benefits of using the LTC and POQ methods?

A: The benefits of using the LTC and POQ methods include:

Penghematan Biaya (Cost Savings): The LTC and POQ methods can help minimize the total cost of concrete iron supply by optimizing the number of orders and ordering time.
Efisiensi Operasional (Operational Efficiency): The application of the LTC and POQ methods can improve operational efficiency by minimizing material stockpiling and shortages.
Perencanaan yang Lebih Baik (Better Planning): The LTC and POQ methods provide a strong basis for more accurate and effective material supply planning.

Q: How do the LTC and POQ methods compare to the Purchase Order (PO) method?

A: The LTC and POQ methods can produce savings compared to the PO method. In the case study, the LTC and POQ methods produced a total cost of Rp. 613,796,088 and Rp. 613,845,288, respectively, while the PO method produced a total cost of Rp. 614,262,590.2.

Q: What are the limitations of the LTC and POQ methods?

A: The limitations of the LTC and POQ methods include:

Sensitivity to assumptions: The LTC and POQ methods are sensitive to assumptions about demand, storage costs, and ordering costs.
Complexity: The LTC and POQ methods can be complex to implement and require significant data and computational resources.
Uncertainty: The LTC and POQ methods do not account for uncertainty in demand and supply.

Q: How can the LTC and POQ methods be improved?

A: The LTC and POQ methods can be improved by:

Developing a more comprehensive model: Developing a more comprehensive model that incorporates the LTC and POQ methods with other inventory management techniques.
Applying the LTC and POQ methods in different industries: Applying the LTC and POQ methods in different industries to evaluate their effectiveness and adaptability.
Evaluating the impact of uncertainty: Evaluating the impact of uncertainty on the LTC and POQ methods and developing strategies to mitigate its effects.

Q: What are the future research directions for the LTC and POQ methods?

A: Future research directions for the LTC and POQ methods include:

Developing a more comprehensive model: Developing a more comprehensive model that incorporates the LTC and POQ methods with other inventory management techniques.
Applying the LTC and POQ methods in different industries: Applying the LTC and POQ methods in different industries to evaluate their effectiveness and adaptability.
Evaluating the impact of uncertainty: Evaluating the impact of uncertainty on the LTC and POQ methods and developing strategies to mitigate its effects.

By understanding the LTC and POQ methods and their benefits, limitations, and future research directions, organizations can make informed decisions about their material supply management strategies and optimize their costs.