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Equipment PP-101
FM dead_leg_corrosion
ISO 14224 mode ELP External leakage - process
Source Synthetic
死角/滞留区腐蚀（Dead-Leg Corrosion）
PP-101 · Piping
Related equipment → PP-101
0.75Source conf.
0.40Evidence conf.
ELPISO 14224 mode
1Failure Mechanism
Function:输送工艺流体，维持设计压力与流量
Failure cause:盲管/死区介质滞留；沉积物下腐蚀；长期未排空
2Source Basis (where this FM comes from)
SyntheticCSB Accident DBPublic newsNUREG (US NRC)Quant benchmark
Source confidence 0.75: this FM is derived from the ontology KB and cross-validated by Synthetic·CSB Accident DB·Public news·NUREG (US NRC)·Quant benchmark.
3Evidence Chain (supporting basis)
Evidence text：None
Evidence conf.：0.4 · Evidence source：synthetic
Governing standards (evidence)：ima://7458030677405755/word_11035ae55c1b08ddb9e6d8bfbece61fe_9e91b9cfd6d537bf9426fc2acf0b97a27458030677405755 — ITP-3 Piping（杜邦制造质量检验测试计划）ima://7458030677405755/word_11035ae55c1b08ddb9e6d8bfbece61fe_ba6bf0b46e5c0701a71c71f6cf627fbf7458030677405755 — ITP-11 Piping-RTP（杜邦制造质量检验测试计划）
4Related Real Accidents (traceable to accident cards)
This FM is recorded in 6 real accident investigation(s); tap the report no. to open the corresponding accident lesson card.
5Applicable Standards & Clauses
API 570API 574API 571API 581ISO 14224:2016API 580GB/T 20801GB/T 44692
Standard clause references (5):
API 570API 571API 581GB/T 20801ISO 14224:2016
6Derived Analysis (seeded from this FM)
5/4/3FMEA Sev/Occ/Det
0.15RBI λ
0.55Monitor pdet
4 月Insp. int.
Current tasks:每月腐蚀/振动监测；每2年超声波壁厚抽检（高风险段加密）
RCFA incident:PP-101 发生死角/滞留区腐蚀，严重程度 5，后果类型 Operational
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task按压差/效率监测设定清洗周期 + 过滤/防堵维护; 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; fouling
Governing standardsAPI 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。