December 2011

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HP Reliability: Spare parts availability and the need for non-OEM options

Reliability engineers and their associated job functions often try hard to make their responsible supply-chain staff or purchasing departments understand that it is impossible for the maintenance depa..

Bloch, H. P., Hydrocarbon Processing Staff

Reliability engineers and their associated job functions often try hard to make their responsible supply-chain staff or purchasing departments understand that it is impossible for the maintenance department to plan, or accurately predict, spare parts demand. The reason is that a major proportion of equipment and systems fail randomly. A good example would be rolling element bearings in all industries worldwide. According to bearing manufacturers’ statistics, 91% fail before they reach the end of their conservatively estimated design lives, and only 9% reach the end of design life. The millions that prematurely fail every year can all be slotted in one or more of the seven basic failu

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