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Risk-Based Inspection

API ICP Self Study Notes

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f) Deterioration rate under some extremes of conditions is so high that failure<br />

can occur within a very short time. Even though no deterioration is found<br />

during an inspection, failure could still occur as a result of a change or<br />

upset in conditions. For example, if a very aggressive acid is carried over<br />

from a corrosion resistant part of a system into a downstream vessel that is<br />

made of carbon steel, rapid corrosion could result in failure in a few hours<br />

or days. Similarly, if an aqueous chloride solution is carried into a stainless<br />

steel vessel, chloride stress corrosion cracking could occur very rapidly<br />

(depending on the temperature).<br />

极 端 高 劣 化 率 , 导 致 故 障 可 能 发 生 在 很 短 的 时 间 内 ( 例 如 : 操 作 更 改 或 工 艺 颠<br />

覆 状 况 )<br />

API 580<br />

Charlie Chong/ Fion Zhang

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