the design service life is based on the precondition of g-l layer failure not occur, on the normal condition of balanced operation and routine maintenance.
设计使用寿命是指在正常平稳操作及正常维护条件下,基于搪瓷层没有产生失效的这一前提下所确定的容器使用寿命。
the mine of yinmusi lead-zinc in fengxian started construction in 1986, the 1990 production, design service life of 19 years, has produced 11.
风县银母寺铅锌矿于1986年开始筹建,1990年投产,设计服务年限19年,至今已生产11年。
with time going on, more and more bridges will reach or approach their design service life and the structural damages will appear because of kinds of reasons.
随着时间的推移,越来越多的桥梁将达到或接近其设计基準期,或因为各种原因发生结构性损伤。
on the condition that the design service life is confirmed, the design reliability level of the chemical structures should include the corrosive environment and its effect on the structures.
因此,在设计基準期预先确定条件下,化工结构的设计可靠度水平应综合考虑腐蚀性环境及其对建筑结构的影响特点来决策。