有关压力容器？ cyclic pressure from 0.018 mpag to 0.086 mpag. ucc&ptc estimates 200000 cycles per year. ucc&ptc recommends designing for a conservative vessel life (30~50 years) as these vessels are not typically replaced. ultimately, the number of cycles to be used for the vessel design others decision based on the design code used, expected vessel life, process parameters, production rate, and inspection frequency consideration. the inspection frequency must be increased as the vessel ages. it is impossible to predict exactly when fatigue cracks will begin. once the vessel experiences a high number of cycles, others will have to reqply on inspection, not cycle counts, to determine the vessel's capacity. any cracks that are discoverred must be repaired promptly. ultimately, the inspection frequency will need to increase as the vessel ages. （e---c）循环压力为 0.018~0.086mpag 。 ucc&ptc 估 计 每年循环 200000 次。 考虑到 该容器 不宜替换 ， ucc&ptc 推荐容器的设计使用寿命为 30-50 年。 最终， 容器的循环次数应根据设计规范、预计使用寿命、 工艺参数 、生产率和 检验频率 来确定。检验频率随容器的使用年限而增加。 何时产生疲劳裂纹无法精确估计。 一旦容器达到 高循环次数 ，则容器的工作能力取决于检验结果而非循环次数。裂纹一经发现必须立即修补。 最终检验频率 应随容器使用年限而增加。 just for reference! 查看更多
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