Subsea Pipeline Appendage Finite Element Analysis and Comparison of Different Checking Criteria

Abstract

Abstract:

Subsea pipeline system consists of pipelines, risers, spools and appendages. For pipelines and risers, special softwares is used for analysis and design; for the appendages, common finite element analysis (FEA) software is used. We use the ANSYS software to do the analysis for appendages. Considering the real load of the appendages, FEA model is built, and the stress distribution is obtained. According to DNV-OS-F101 code and ASME Ⅷ Div2 code, stress checking is carried out to estimate if the appendages can meet the requirements and ensure the safe operation. Besides, the comparison between the two checking criteria can provide a reference for future projects.

Key words:marine oil and gas pipeline,subsea pipeline appendage,finite element analysis,checking criterion

CLC Number:

TE973

Jie ZHANG, Guo-min SUW, Hong-qi MA, Guo-yang LAN. Subsea Pipeline Appendage Finite Element Analysis and Comparison of Different Checking Criteria[J]. Ocean Engineering Equipment and Technology, 2015, 2(2): 93-98.

Figures/Tables18

Fig.1

Fig.2

锚固件类型	参数	取值
Ⅰ型	L₁	200
L₂	400
L₃	20
R	10
Ⅱ型	L₁	200
L₂	400
L₃	20
R	10

Table 1

描述	设计值
制造工艺	铸造
材料级别	ASTM A694 F65
最小屈服强度/MPa	450
最小拉伸强度/MPa	535
钢材密度/(kg·m^-3)	7850
弹性模量/MPa	2.07×10⁵
泊松比	0.3
设计压力/MPa	2.3
设计温度/℃	92
内腐蚀裕量/mm	3.0
介质密度/(kg·m^-3)	980

Table 2

描述	数据
管线级别	API 5L PSL2 X65
内管外径/mm	219.1
外管外径/mm	323.9
内管壁厚/mm	14.3
外管壁厚/mm	12.7
最小屈服强度/MPa	450
最小拉伸强度/MPa	535
钢材密度/(kg·m^-3)	7850
弹性模量/MPa	2.07×10⁵
泊松比	0.3
线膨胀系数/K^-1	11.7×10^-6

Table 3

Fig.3

Fig.4

锚固件类型	力/N	弯矩/(N·m)
Ⅰ型	内管	822570	9	-85	1045	235	-1498
外管	-824371	855	-792	3071	-274	-5843
Ⅱ型	开始端	93775	3926	23609	1495	-62318	11433
结束端	807108	2926	2714	364	-5877	7358

Table 4

Fig.5

Fig.6

Fig.7

Fig.8

锚固件类型	最大应力 /MPa	许用应力^* /MPa	UC值 /%	校核结果
Ⅰ型	166	284.6	58.3	OK
Ⅱ型	269	284.6	94.5	OK

Table 5

Table 6

Bulkhead checking criteria of ASME Ⅷ Div2 standard

应力强度	荷载组合	许用应力
一次总体薄膜应力	p_m	$S m *$
一次局部薄膜应力	p_L	1.5S_m
一次局部薄膜应力+ 一次弯曲应力	p_L+p_b	1.5S_m

Table 6

Fig.9

Fig.10

荷载组合	锚固件应力 /MPa	许用应力 /MPa	UC值/%	校核结果
p_m	131	222.9	58.8	OK
p_L	155	334.3	46.4	OK
p_L+p_b	167	334.3	50.0	OK

Table 7

荷载组合	锚固件应力 /MPa	许用应力 /MPa	UC值/%	校核结果
p_m	208	222.9	93.3	OK
p_L	253	334.3	75.7	OK
p_L+p_b	261	334.3	78.1	OK

Table 8

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