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Inventory management of spare parts in an energy company

Guajardo, Mario; Rönnqvist, Mikael; Halvorsen, Ann Mari; Kallevik, Svein Inge
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http://hdl.handle.net/11250/227259
Utgivelsesdato
2012-06
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  • Discussion papers (FOR) [529]
Sammendrag
We address a problem of inventory management of spare parts in the context

of a large energy company, producer of oil and gas. Spare parts are critical

for assuring operational conditions in offshore platforms. About 200,000

different items are held in several inventory plants. The inventory system

implemented at the company corresponds to a min-max system. The control

parameters are decided based mainly on the expert judgment of the planners.

Also, though the inventory plants can in practice be supplied from each

other, the inventory planning is performed separately by the plant planners.

This is because of different ownership structures where the studied company

has the operative responsibility. The company is pursuing a system in which

all planners conform to the same inventory management approach and evaluation,

as well as being more cost efficient. Our work focuses on supporting

this goal. We apply methods to decide the inventory control parameters for

this system under a service level constraint. The methodology we use distinguishes

unit-size and lot-size demand cases. We perform computational

experiments to find control parameters for a sample of items. After the control

parameters are found, we use them to explore the impact of risk pooling

among the plants and inaccuracy arising from duplicate item codes.
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Discussion paper;06/12

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