Parameter Research on the Contact Load of the Over-Bend of Flexible Pipe During Laying

Abstract

Abstract:

The over-bend of the flexible pipe will be subjected to obvious contact load during horizontal laying and failure may occur because of crushing. This usually restricts the application of horizontal laying in deep water. Therefore, it is significant to accurately estimate the contact load on the over-bend of the flexible pipe during laying. We carry out theoretical research on the over-bend contact load, deduce a simplified calculation formula, and investigate the key parameters which affect the contact load in the laying cases by numerical simulation. The results can offer a specific guidance for the over-bend contact load analysis in flexible pipe laying, and provide a reference for the laying design as well.

Key words: flexible pipe, horizontal laying, over-bend crushing, contact load

CLC Number:

TE53

Hai-bin YE, Jian-feng YUE, Yong-biao YE, Qian-jin YUE, Jin-long CHEN. Parameter Research on the Contact Load of the Over-Bend of Flexible Pipe During Laying[J]. Ocean Engineering Equipment and Technology, 2015, 2(3): 184-188.

Figures/Tables 12

Fig.1

Fig.2

Fig.3

Table 1

Table 2

Fig.4

Table 3

Fig.5

Table 4

Fig.1

Table 5

Fig.7

References 14

[1]	汤明刚, 王野, 阎军, 等. 海洋柔性管道骨架层压溃的有限元分析[J]. 哈尔滨工程大学学报, 2013, 34(9): 1135. doi: 10.3969/j.issn.1006-7043.201302003 URL
[2]	卢青针, 岳前进, 汤明刚, 等. 海洋柔性管的抗拉性能及加强设计[C].第十四届中国海洋 (岸) 工程学术讨论会论文集 (上册),2009:100.
[3]	Goto Y, Okamoto T, Araki M, et al.Analytical study of the mechanical strength of flexible pipes[J]. Journal of Offshore Mechanics and Arctic Engineering, 1987, 109(3): 249.
[4]	Malcorps A, Felix-Henry A.Validation of a computer model for flexible pipe crushing resistance calculations[C]. ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering, 2008: 343.
[5]	Franzini G R, Pesce C P, Takafuji F C M, et al. Crushing of flexible pipes under traction: a theoretical-experimental assessment[C]. ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering, 2011: 503.
[6]	De Sousa J R M, Lima E C P, Ellwanger G B, et al. Local mechanical behavior of flexible pipes subjected to installation loads[C]. Proceedings of the 20th International Conference on Offshore Mechanics and Arctic Engineering, 2001.
[7]	American Petroleum Institute. API RP 17B. Recommended practice for flexible pipe[S].2008.
[8]	American Petroleum Institute. API RP 2RD. Design of risers for floating production systems (FPSs) and tension leg platforms (TLPs)[S]. 2006.
[9]	Patel M H, Seyed F B.Review of flexible riser modelling and analysis techniques[J]. Engineering Structures, 1995, 17(4): 293. doi: 10.1016/0141-0296(95)00027-5 URL
[10]	Sun L, Qi B.Global analysis of a flexible riser[J]. Journal of Marine Science and Application, 2011, 10(4): 478. doi: 10.1007/s11804-011-1094-x URL
[11]	Orcina Ltd. OrcaFlex User Manual, v9.5a[EB/OL]. .
[12]	邹景涛. 海底柔性管道铺设设计与分析技术研究[D]. 大连:大连理工大学, 2014.
[13]	哈尔滨工业大学理论力学教研室. 理论力学(第六版)[M]. 北京:高等教育出版社, 2002.
[14]	黄平, 郭丹, 温诗铸. 界面力学[M]. 北京:清华大学出版社, 2013.

铺管船参数	数值
船长/m	80
下水桥半径/m	6
管道与下水桥摩擦系数	0.3
管道外径/mm	450
管道最大允许挤压力/(kN·m^-1)	120
管道拉伸刚度/MN	1 600
管道弯曲刚度/(kN·m^-2)	600
铺设脱离角/(°)	8
管道与下水桥接触刚度/(kN·m^-2)	10 000

水深	最大张力/kN	上弯段最大接触力 /(kN·m^-1)
100	184	56.3
200	333	78.6
300	506	107
400	676	131
500	839	154

下水桥半径/m	最大接触力/(kN·m^-1)
4	152
5	127
6	107
7	92.9
8	81.8

弯曲刚度/(kN·m^-2)	最大接触力/(kN·m^-1)
50	86.2
100	89.1
400	100
1 000	112

接触刚度/(kN·m^-2)	最大接触力/(kN·m^-1)
1×10⁴	108.9
5×10⁴	134.1
1×10⁵	152.3
5×10⁵	200.1
1×10⁶	215.6
1×10⁷	232.3