Spare parts stock control for redundant systems using reliability centered maintenance data

W. van Jaarsveld, Rommert Dekker

Research output: Contribution to journalArticleAcademicpeer-review

40 Citations (Scopus)

Abstract

In the classical approach to determine how many spare parts to stock, the spare parts shortage costs or the minimum fill rate is a key factor. A difficulty with this approach lies in the estimation of these shortage costs or the determination of appropriate minimum fill rates. In an attempt to overcome this problem, we propose to use the data gathered in reliability centered maintenance (RCM) studies to determine shortage costs. We discuss the benefits of this approach. At the same time, the approach gives rise to complications, as the RCM study determines downtime costs of the underlying equipment, which have a complex relation with the shortage cost for spare parts in case multiple pieces of equipment have different downtime costs. A further complication is redundancy in the equipment. We develop a framework that enables the modeling of these more complicated systems. Based on the framework, we propose an approximative, analytic method that can be used to determine minimum stock quantities in case of redundancy and multiple systems. In a quantitative study we show that the method performs well. Moreover, we show that including redundancy information in the stocking decision gives significant cost benefits.

Original languageEnglish
Pages (from-to)1576-1586
Number of pages11
JournalReliability Engineering and System Safety
Volume96
Issue number11
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

Keywords

  • Inventory control
  • Redundancy
  • Shortage costs
  • Spare parts

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