Risk assessment for overdue in-service pressure pipelines based on BOA-SAM-FTA

doi:10.16265/j.cnki.issn1003-3033.2026.04.0454

Abstract

Abstract:

To investigate the failure issues of overdue in-service pressure pipelines, this paper proposed a method based on integration of BOA and SAM for analyzing the failure probability of such pipelines, building upon the FTA framework. First, the causes of failure in overdue in-service pressure pipelines were analyzed, and a fault tree for failure was established. Then, experts were invited to evaluate the basic events of fault tree, and their opinions were aggregated using SAM method and an improved BOA-SAM approach. The accuracy of aggregation was assessed by comparing the uncertainty values of two methods(the lower the uncertainty value, the more precise the aggregation result). Finally, the failure probability of the top event was calculated, and an importance analysis was conducted. The results show that the uncertainty values of the aggregation results obtained using the improved BOA-SAM are significantly lower than those of SAM method. Notably, for the basic event X₆, the uncertainty value decreased by 7.6%. The failure probability of the top event is calculated to be 0.117 641. Stress corrosion cracking, third-party damage, weld cracking and excessive H₂S content in the medium are identified as the key factors contributing to the occurrence of accidents. This study provides a scientific and logical approach for risk assessment and failure analysis of overdue in-service pressure pipelines.

Key words: butterfly optimization algorithm (BOA), similarity aggregation method (SAM), fault tree analysis (FTA), overdue in-service pressure pipelines, risk assessment, failure probability

CLC Number:

X944.4

Tang Huabin, Xu Lei, Chen Siyu, Ma Songhua. Risk assessment for overdue in-service pressure pipelines based on BOA-SAM-FTA[J]. China Safety Science Journal, 2026, 36(4): 57-64.

Figures/Tables 10

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事件及编号	事件及编号	事件及编号
压力管道失效T	螺纹失效M₄₂	内涂层厚度减少或脱落X₁₂
腐蚀相关失效M₁	焊接缺陷M₄₃	第三方破坏X₁₃
材料劣化相关失效M₂	输送流速偏高X₁	外部冲击X₁₄
机械损伤相关失效M₃	介质中H₂S含量偏高X₂	施工缺陷X₁₅
连接失效M₄	介质中 CO₂含量偏高X₃	焊缝开裂X₁₆
内部腐蚀M₁₁	应力腐蚀开裂X₄	密封垫片劣化X₁₇
外部腐蚀M₁₂	外部化学腐蚀X₅	螺栓预警力不足X₁₈
特殊腐蚀M₁₃	杂散电流腐蚀X₆	螺纹腐蚀泄漏X₁₉
温度影响M₂₁	氢脆X₇	过度拧紧滑丝X₂₀
涂层失效M₂₂	腐蚀疲劳X₈	根部未焊透X₂₁
外部破坏M₃₁	高温老化X₉	热影响区裂纹X₂₂
内部缺陷M₃₂	低温脆性X₁₀
法兰泄漏M₄₁	防腐层下积水X₁₁

职称		学历		现场工作经验
等级	权值	等级	权值	等级	权值
正高级	5	博士	5	≥25	10
副高	4	硕士	4	15≤q<25	8
中	3	本科	3	8≤q<15	6
初	2	大专	2	2≤q<8	4
技术	1	中专	1	q<2	2

专家	专家职位	现场工作经验	教育水平	总权值	权重
1	工程师	4	硕士	11	0.113
2	高级工程师	20	博士	18	0.185
3	高级工程师	14	硕士	15	0.155
4	高级工程师	9	硕士	14	0.144
5	高级工程师	13	硕士	15	0.155
6	教授	1	博士	12	0.124
7	教授	1	博士	12	0.124

专家	1	2	3	4	5	6	7	专家	1	2	3	4	5	6	7
X₁	L	H	H	L	L	ML	ML	X₁₂	VL	M	M	VL	M	L	VL
X₂	VH	H	VH	H	M	H	VH	X₁₃	MH	ML	MH	MH	H	MH	H
X₃	L	L	ML	ML	L	M	ML	X₁₄	ML	ML	MH	MH	L	MH	H
X₄	M	MH	H	MH	MH	MH	H	X₁₅	M	ML	M	M	ML	ML	ML
X₅	ML	ML	H	H	M	MH	MH	X₁₆	MH	M	MH	M	MH	H	VH
X₆	MH	L	MH	MH	H	ML	ML	X₁₇	M	ML	M	ML	ML	ML	ML
X₇	ML	H	L	H	L	ML	M	X₁₈	ML	ML	M	ML	ML	ML	ML
X₈	VL	H	VL	H	VL	MH	MH	X₁₉	L	ML	ML	ML	L	ML	ML
X₉	ML	L	ML	L	L	ML	ML	X₂₀	L	ML	M	ML	L	ML	ML
X₁₀	VL	L	VL	VL	L	ML	ML	X₂₁	ML	ML	MH	ML	L	MH	H
X₁₁	VL	VL	VL	VL	L	VL	M	X₂₂	ML	ML	VL	VL	VL	ML	ML

编号	SAM的不确定性值	BOA-SAM的不确定性值	失效概率	编号	SAM的不确定性值	BOA-SAM的不确定性值	失效概率
X₁	0.124 934	0.124 756	0.003 142	X₁₂	0.121 400	0.119 235	0.000 908
X₂	0.121 699	0.119 735	0.036 210	X₁₃	0.175 556	0.172 402	0.012 423
X₃	0.144 954	0.142 456	0.000 885	X₁₄	0.178 368	0.172 599	0.005 431
X₄	0.167 275	0.161 276	0.015 686	X₁₅	0.160 820	0.158 907	0.002 556
X₅	0.157 508	0.154 840	0.008 741	X₁₆	0.154 994	0.148 911	0.013 526
X₆	0.178 275	0.165 630	0.005 659	X₁₇	0.177 496	0.171 582	0.002 121
X₇	0.127 985	0.124 010	0.003 998	X₁₈	0.190 239	0.184 878	0.001 827
X₈	0.147 938	0.146 021	0.003 588	X₁₉	0.178 633	0.173 522	0.000 997
X₉	0.157 211	0.151 943	0.000 688	X₂₀	0.165 729	0.158 212	0.001 255
X₁₀	0.147 806	0.145 462	0.000 174	X₂₁	0.178 368	0.172 537	0.003 865
X₁₁	0.140 769	0.136 410	0.000 073	X₂₂	0.179 66	0.177 46	0.000 352