Major overhauls or installations may be scheduled during plant shutdowns or over weekends, which requires scheduling of maintenance manpower to work during those periods.

大修或装置可能被安排在工厂停工或在周末，这需要维护的人力调度，在这些时期内的工作。

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Results showed that usage of maintenance cost and manpower are 92.8% and 99.9%, respectively.

计算结果表明，维修费用和维修人员的使用率分别达到92.8%和99.9%。

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The field spot-usage testifies that this kind of stuffing box is characterized by its simple structure, easy operation, manpower saving, maintenance time saving and high efficiency.

经现场使用表明，该装置的特点是结构简单、使用方便、节省劳力、减少维修时间、工效高。

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There are a bunch of economic reasons: These plants require lots of maintenance and manpower because they are dealing with a feedstock that is constantly changing.

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