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Equipment H-101
FM bend_thinning
ISO 14224 mode STD Structural deficiency
Source OPC Ontology KB
回弯头减薄 (Bend Thinning)
H-101 · fired_heater
Related equipment → H-101
0.82Source conf.
0.80Evidence conf.
STDISO 14224 mode
1Failure Mechanism
Function:连接相邻炉管
Failure cause:介质流速过高或含固体颗粒；弯头处流道突变加剧冲刷；材质耐腐蚀性不足
Damage mechanism：回弯头冲蚀/冲刷减薄（erosion/thinning at return bends, 固含/高速）
2Source Basis (where this FM comes from)
OPC Ontology KBCSB Accident DBQuant benchmark
Source confidence 0.82: 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_560
Governing standards (evidence)：std:API-571 — API 571 — Damage Mechanisms Affecting Fixed Equipment · 损伤机理归类框架std:API-574 — API 574 — Inspection Practices for Piping System Components · 管道元件检验std:API-570 — API 570 — Piping Inspection Code · 工艺管道检验
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 580API 581-2025GB/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 570API 571API 579-1/ASME FFS-1API 754API 576API 689API 755ISO 14224:2016ISO 20815:2018IEC 61511:2016ISO 31000:2018
6Derived Analysis (seeded from this FM)
8/5/3FMEA Sev/Occ/Det
0.4RBI λ
0.55Monitor pdet
4 月Insp. int.
Current tasks:定期测量回弯头壁厚 | 检查冲刷腐蚀
RCFA incident:H-101 发生回弯头减薄 (Bend Thinning)，严重程度 8，后果类型 Safety/Environmental
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task壁厚/型线超声测厚 + 耐磨层状态检查, 视情修复或涂层; 温度/红外热成像监测, 超温报警与根因排查; 无损检测(UT/VT/MT/PT), 按 API 581 RBI 风险定级设定检验间隔
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; erosion; overheat
Governing standardsAPI 510API 530API 570API 571API 581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。