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Risk-Based Inspection

API ICP Self Study Notes

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7.4.2 Start-up and Shutdown 启 动 和 关 机<br />

Process conditions during start-up and shutdown can have a significant effect<br />

on the risk of a plant especially when they are more severe (likely to cause<br />

accelerated deterioration) than normal conditions, and as such should be<br />

considered for all equipment covered by the RBI assessment. A good example<br />

is polythionic acid stress corrosion cracking (PTASCC). The POF for<br />

susceptible equipment is controlled by whether mitigation measures are applied<br />

during shutdown procedures to avoid PTASCC. Start-up lines are often<br />

included within the process piping and their service conditions during start-up<br />

and subsequent operation should be considered.<br />

启 动 和 关 机 过 程 中 的 工 艺 条 件 , 可 能 对 设 备 加 速 劣 化 从 而 对 风 险 有 显 著 负 面 影 响 .<br />

这 也 是 RBI 评 估 应 考 虑 的 范 围 .<br />

API 580<br />

Charlie Chong/ Fion Zhang

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