API 521中有这么一句话 不知如何理解？ 建议你把这句话重新组合，分成两句话，就容易理解了： 1. for determining relief loads, it may be assumed that manual and remotely operated valves remain in operation at their normal operating positions. 2. " the manual and remotely operated valves " are normally open and functioning at the time of inadvertent closure or failure, and "they" are not affected by the primary cause of failure. 查看更多
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