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Equipment V-201A
FM bottom_weld_crack
ISO 14224 mode STD Structural deficiency
Source OPC Ontology KB
底板焊缝开裂 (Bottom Weld Crack)
V-201A · Storage tank
Related equipment → V-201A
0.75Source conf.
0.80Evidence conf.
STDISO 14224 mode
1Failure Mechanism
Function:承受液柱静压，防止泄漏至地基
Failure cause:焊接质量缺陷（如未熔合、气孔）；底板变形引起的附加应力；介质应力腐蚀环境
2Source Basis (where this FM comes from)
OPC Ontology KBCSB Accident DBQuant benchmark
Source confidence 0.75: this FM is derived from the ontology KB and cross-validated by OPC Ontology KB·CSB Accident DB·Quant benchmark.
3Evidence Chain (supporting basis)
Evidence text：None
Evidence conf.：0.8 · Evidence source：API_653
Governing standards (evidence)：ima://7458030677405755/word_11035ae55c1b08ddb9e6d8bfbece61fe_a261222a8a070345158934949919a5e37458030677405755 — ITP-6 Tanks - Shop Fabricated（杜邦制造质量检验测试计划）ima://7458030677405755/word_11035ae55c1b08ddb9e6d8bfbece61fe_ef31c26853319b4b471659463e26846d7458030677405755 — APPENDIX A7-1 Tanks MIQA Inspection Template
4Related Real Accidents (traceable to accident cards)
This FM is recorded in 16 real accident investigation(s); tap the report no. to open the corresponding accident lesson card.
5Applicable Standards & Clauses
API 580GB/T 7826-2012ISO 14224:2016SAE JA1011_202411
Standard clause references (22):
GB/T 7826-2012GB/T 27921-2011GB/T 36894-2018GB/T 44958-2024GB/T 37243-2019GB/T 4888-2008GB/T 29639-2020AQ/T 3034-2022API 581API 580API 510API 653API 571API 579-1/ASME FFS-1API 754API 576API 689API 755ISO 14224:2016ISO 20815:2018IEC 61511:2016ISO 31000:2018
6Derived Analysis (seeded from this FM)
9/4/5FMEA Sev/Occ/Det
0.34RBI λ
0.8Monitor pdet
4 月Insp. int.
Current tasks:定期进行焊缝无损检测（如MT、UT） | 优化焊接工艺，降低残余应力 | 控制液位变化速率，减少循环载荷
RCFA incident:V-201A 发生底板焊缝开裂 (Bottom Weld Crack)，严重程度 9，后果类型 Operational
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task沉降/变形观测 + 支撑/基础评估; 无损检测(UT/VT/MT/PT), 按 API 581 RBI 风险定级设定检验间隔; 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=corrosion; deformation; seal_leak
Governing standardsAPI 510API 570API 571API 579API 581API 653API 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。