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Risk-Based Inspection

API ICP Self Study Notes

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9.3 Failure Modes 失 效 模 式<br />

Once a credible damage mechanisms has been identified, the associated<br />

failure mode should also be identified. For example, local thinning could lead to<br />

a pinhole leak in the pressure containing boundary. There may be more than<br />

one credible failure mode for each damage mechanism. For example, cracking<br />

could lead to a through-wall crack with (1) a leak before break scenario or (2)<br />

could lead to a catastrophic rupture.<br />

The failure mode will depend on the type of cracking, the geometric orientation<br />

of the cracking, the properties of the material of construction, the component<br />

thickness, the temperature, and the stress level. Examples of failure modes<br />

include: 一 旦 一 个 可 靠 的 损 伤 机 制 被 确 定 , 相 关 的 故 障 模 式 ( 或 多 个 ) 也 应 查 明 . 故<br />

障 模 式 的 例 子 包 括<br />

a) pinhole leak, 针 孔 泄 漏<br />

b) small to moderate leak, 小 到 中 等 泄 漏<br />

c) large leak, 大 量 泄 漏<br />

d) ductile rupture, 韧 性 开 口<br />

e) brittle fracture. 脆 性 断 裂<br />

API 580<br />

Charlie Chong/ Fion Zhang

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