. It aims to balance safety, reliability, and cost control by systematically categorizing and classifying spare parts and formulating corresponding inventory, procurement, and usage strategies. Common classification systems mainly include the ABC classification method, importance grading (Critical/Essential/Non-essential), and multi-level grading (such as AAA‑CCC, A‑E five categories). Although different systems have slightly different focuses, their core goal is the same: to prioritize the protection of “key, high-value, and frequently needed” spare parts to reduce the risk of downtime caused by stockouts; and to use economic order quantities or external commissioning methods for “low-value, infrequently needed” spare parts to reduce capital occupation.
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