operational life span

英 [ˌɒpəˈreɪʃənl laɪf spæn]

美 [ˌɑːpəˈreɪʃənl laɪf spæn]

使用寿命期

In order to improve wearing resistance of the seal and prolong the operational life span, surface modification must be done to the seal.
为提高密封面耐磨性，延长使用寿命，需对密封面进行改性处理。
The process of detection-assessment-repairing and reinforcement is an effective operational chain to assure the integrity of the pipelines. The technology of repairing and reinforcement for pipelines is one of the most important ways to assure their integrity and prolong their operational life span.
管道进行检测-评估-维修补强是保证管道完整性的一个有效的作业链，管道维修补强技术是保证管道完整性和延长管道使用寿命的重要手段。
The main performances of resistance muffler include insert loss, pressure loss, processing property of manufacture and operational life span.
衡量抗性消声器的性能指标主要包括：插入损失、压力损失、装配性能、结构工艺性和使用寿命。
The application of Pb-PAN composite coating in electrodeposition zinc. The indexs of composite coating such as current efficiency, cell voltage and so on, is superior to pure lead coating, but the operational life span need to be improved.
测试了Pb-PAN复合镀层在电积锌应用中的槽电压、电流效率、加速腐蚀寿命等指标，其性能均优于纯铅镀层，但其使用寿命有待进一步提高。