Design of Static Bend Stiffener for Flexible Pipes

Abstract

Abstract:

With the localization of flexible pipes, more and more oil fields use the flexible pipe as conveying flowline. End fitting whose function is to connect the pipe sections is a rigid structure, while the pipe body is flexible, there is a stiffness mutation between them. When subjected to a large bending moment, the pipe body will be damaged, so it is necessary to set a bend stiffener between the pipe and the end fitting. To design a bend stiffener, an applicable material should be selected. We use polyurethane elastomer as the principal material for the bend stiffener. Besides, some steel interface structures are requisite. We mainly introduce a static bend stiffener design. It can protect the pipe during installation and overboarding.

Key words: subsea pipeline, flexible pipe, end fitting, bend stiffener, polyurethane elastomer

CLC Number:

TE973

Lan LI, Yin-na ZHANG. Design of Static Bend Stiffener for Flexible Pipes[J]. Ocean Engineering Equipment and Technology, 2014, 1(3): 223-226.

Figures/Tables 11

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Table 1

Table 2

Fig.9

参数	取值
硬度/HS-D	65±2
拉伸强度/MPa	44
25 ℃时密度/(g· cm^-3)	1.19

参数	取值
屈服强度/MPa	≥345
抗拉强度/MPa	470~630
断裂延伸率/%	≥21

[1]	American Petroleum Institute.API SPEC 17J. Specification for unbonded flexible pipe[S]. 2008.
[2]	American Petroleum Institute.API RP 17B. Recommended practice for flexible pipe[S]. 2008.
[3]	American Petroleum Institute.API SPEC 17L1. Specification for flexible pipe ancillary equipment[S]. 2012.
[4]	American Petroleum Institute.API RP 17L2. Recommended practice for flexible pipe ancillary equipment[S]. 2012.

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