Modelling of Maintenance ServiceWorkshop and Inventory Operations for a Short Cycle Operational Region.
Master thesis
Permanent lenke
https://hdl.handle.net/11250/3088407Utgivelsesdato
2023Metadata
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Sammendrag
The North Sea region sees a high operational cycle of tools that require frequent maintenancecheck-ups, repairs, and preparations for subsequent operations. Given thequick-paced nature of these operations, the availability of spare parts at the maintenanceworkshop is critical for maintaining minimal flowtime. Adding to the challengeis the practice of sourcing spare parts from best-cost countries, leading to a lead timeof approximately one year, thus necessitating an optimal economic order quantityand reorder point. The balancing act between maintaining sufficient inventory atthe workshop and managing operational expenses through batch ordering of spareparts is a complex one. Frequent supply requirements contribute to the environmentalimpacts through increased spare part scrap rates. With these challenges in mind,this thesis aims to develop a simulation model capable of quantifying the costs andbenefits associated with reusing repaired spares, as compared to procuring newlybuilt spares from best-cost countries. To achieve this, a case study focusing on aspecific maintenance workshop within the North Sea region was carried out. Thecomprehensive tool repair and spare part supply operations were conceptualized andmodeled using a simulation approach. Two operational scenarios were simulated:the first, where the maintenance workshop was completely dependent on newly builtspares sourced from best-cost countries, with no inventory stock dedicated for sparesre-usage. In the second scenario, the workshop primarily relied on repaired spares,with a safety level of new build stock maintained. The results, guided by the researchquestion probing the impact of implementing a repair-path cycle process within themaintenance process, showed that the enhanced model significantly outperformedthe baseline model across several key metrics over a model time run of three years.These include a 78% reduction in lead times, a 116% improvement in worker utilization,a 73% reduction in crowding levels, a 52% reduction in scrap rate, and a potentialprofit increase of roughly three million NOK (20%). This thesis provides evidence thatthe enhanced model, with its focus on repaired spares, presents a more sustainable,efficient, and profitable solution to the challenges of inventory management in highcycleoperations. It is important to note, however, that the sensitivity of these resultsis closely tied to the high procurement lead times.