The oil and gas processing plant is a chaotic network of equipment, piping networks, Infrastructure etc. Cost control and cost-effective maintenance of machines with lower breakdowns of equipment and piping systems increase the enterprise's production. How malfunctions affect capacity, quality, and operating cost. Choosing the right maintenance policy in a wide range of maintenance policies generates profits. In this paper, A case study of Production operations (Maintenance) is conducted to identify Division wise pre-planned maintenance (PPM) and Shut down Maintenance (SM) parts, together and compare them with the cost-benefit analysis model. However, crafting a maintenance strategy depends on some factors, including downtime cost, reliability characteristics, and asset duplication. Thus, the balance between Division wise PPM and SM to reduce costs between institutional equipments and assets. Studies on the relationship between PPM and SM costs have been studied in this article by analyzing historical data. Statistics of the study results show that PPM benefit is positive and more beneficial with the benefit to cost ratio and its comparison with Shut down maintenance. At the same time, increase the operating plant availability and productivity. However, the results depend on including / excluding user costs, as well as individual oil and gas regulatory parameters.