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Equipment PSV-101
FM failure_to_open
ISO 14224 mode PSV fail to open PSV fail to open
Source synthetic + standards-based engineering estimate (ISO 14224 / API / IEC 61511 框架归类)
拒动（超压不开启）
PSV-101 · Pressure Safety Valve (Relief Device)
Related equipment → PSV-101
0.82Source conf.
—Evidence conf.
PSV fail to openISO 14224 mode
1Failure Mechanism
Function:超压时开启泄压
Failure cause:卡涩/整定漂移/堵塞
Damage mechanism：超压时阀门未开启，容器超压风险（API 521 后果）
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 521 — Pressure-relieving and Depressuring Systems · 机理级工程估计，非实测；引用 governing standard 作为分类出处std:API 581 — Risk-based Inspection Methodology · 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)
9/2/3FMEA Sev/Occ/Det
0.05RBI λ
0.8Monitor pdet
6 月Insp. int.
Current tasks:在线/离线起跳试验 | RBI 高风险管控
RCFA incident:拒动（超压不开启）：卡涩/整定漂移/堵塞，后果类型 Safety，严重度 9
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task绝缘/电气试验 + 继电保护定值校核 + 操动机构特性测试; 标定/零点-跨度校验 + SIL Proof test + 阀门行程试验 + 变更管理; 按压差/效率监测设定清洗周期 + 过滤/防堵维护
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=electrical; fouling; instrument
Governing standardsAPI 571GB/T 14285GB/T 21109IEC 60034IEC 61511IEEE C57ISA 84厂家规范
⚠ 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。