← Back to KB navigation
Equipment GB-101
FM gear_tooth_surface_pitting
ISO 14224 mode Gear tooth pitting Gear tooth pitting
Source synthetic + standards-based engineering estimate (ISO 14224 / API / IEC 61511 框架归类)
Gear-tooth Pitting
GB-101 · Gearbox (Speed Reducer/Increaser)
Related equipment → GB-101
0.82Source conf.
—Evidence conf.
Gear tooth pittingISO 14224 mode
1Failure Mechanism
Function:传递转矩并改变转速
Failure cause:接触疲劳在齿面萌生微裂纹
Damage mechanism：齿面接触疲劳（ISO 6336 接触应力超过疲劳极限），赫兹接触区萌生点蚀坑
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:ISO 6336 — Calculation of load capacity of spur and helical gears · 机理级工程估计，非实测；引用 governing standard 作为分类出处std:API 677 — General-purpose Gear Units for Petroleum, Chemical and Gas Industry Services · 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 2 real accident investigation(s); tap the report no. to open the corresponding accident lesson card.
5Applicable Standards & Clauses
API 677ISO 6336AGMA 2001ISO 14224:2016GB/T 3480GB/T 6075ISO 13372API 580GB/T 7826-2012SAE JA1011_202411
No separate clause reference.
6Derived Analysis (seeded from this FM)
6/4/4FMEA Sev/Occ/Det
0.22RBI λ
0.9Monitor pdet
6 月Insp. int.
Current tasks:齿面磁粉/涡流检测 | 振动齿轮啮合频率分析
RCFA incident:齿面点蚀：接触疲劳在齿面萌生微裂纹，后果类型 Operational，严重度 6
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task无损检测(UT/MT/PT) 监测裂纹萌生, 关键转动件定时拆检; 无损检测(UT/VT/MT/PT), 按 API 581 RBI 风险定级设定检验间隔; 振动频谱分析 + 动平衡 + 激光对中, 状态监测趋势管理
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; fatigue; vibration
Governing standardsAPI 570API 571API 579API 581API 612API 670API 684ASME VIIIISO 10816
⚠ 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。