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Equipment PSV-101
FM failure_to_reseat
ISO 14224 mode PSV fail to reseat PSV fail to reseat
Source synthetic + standards-based engineering estimate (ISO 14224 / API / IEC 61511 框架归类)
回座失效（持续泄漏）
PSV-101 · Pressure Safety Valve (Relief Device)
Related equipment → PSV-101
0.82Source conf.
—Evidence conf.
PSV fail to reseatISO 14224 mode
1Failure Mechanism
Function:泄压后关闭
Failure cause:阀座损伤/异物卡阻
Damage mechanism：泄压后阀座不回座持续泄漏（API 527 泄漏）
2Source Basis (where this FM comes from)
synthetic + standards-based engineering estimate (ISO 14224 / API / IEC 61511 框架归类)
Source confidence 0.82: this FM is derived from the ontology KB and cross-validated by synthetic + standards-based engineering estimate (ISO 14224 / API / IEC 61511 框架归类).
3Evidence Chain (supporting basis)
This FM has no offline curated evidence text; it is derived from the ontology KB and cross-validated by the listed standard clauses and related accident investigations.
Governing standards (evidence)：std:API 520 — Sizing, Selection, and Installation of Pressure-relieving Devices · 机理级工程估计，非实测；引用 governing standard 作为分类出处
4Related Real Accidents (traceable to accident cards)
This FM is recorded in 3 real accident investigation(s); tap the report no. to open the corresponding accident lesson card.
5Applicable Standards & Clauses
API 520API 521API 526API 510API 570API 574ASME VIIIGB/T 20801API 581ISO 14224:2016API 580GB/T 7826-2012SAE JA1011_202411
No separate clause reference.
6Derived Analysis (seeded from this FM)
6/3/3FMEA Sev/Occ/Det
0.12RBI λ
0.7Monitor pdet
6 月Insp. int.
Current tasks:回座检查 | 阀座研磨
RCFA incident:回座失效（持续泄漏）：阀座损伤/异物卡阻，后果类型 Operational/Environmental/Safety，严重度 6
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task泄漏监测 + 密封/填料定期更换, 螺栓热紧固
Suggested intervalHigh risk 1-3 mo / Medium 6-12 mo / Low risk at turnaround (by API 581 RBI risk ranking)
Decision basis机理类别=seal_leak
Governing standardsAPI 510API 682
⚠ This decision is engineering-inferred by RCM logic from the damage mechanism / root cause / failure cause — it is not derived from measured site history. Confirm with the equipment owner and process before execution.
⚠ 本卡技术正文（功能 / 致因 / 损伤机理 / RCFA 叙事）保留中文原文——依可信 AI 红线，自由技术文本不自动机翻、不编造英文译文。UI、设备类型、FM 名、ISO 码、标准号均为英文。