Extruding Research of PVDF Used in Large Diameter Flexible Pipe as Inner Pressure Sheath

Abstract

Abstract:

The key points of polyvinylidene fluoride (PVDF) extruding process and the influence of manufacturing temperature are analyzed. The manufacturing process is confirmed and material properties are tested. According to the test results, PVDF can satisfy the requirements of subsea composite flexible pipes. It has good mechanical and thermal properties. PVDF also has good creep resistance and aging resistance, as well as low permeation.

Key words: flexible pipe, PVDF, manufacturing process, double extruding

CLC Number:

TE832

Wei-feng WANG, Dong-jie LIU, Zheng-she PEI, Jing CAO, Yong SHA, Li-wei LI. Extruding Research of PVDF Used in Large Diameter Flexible Pipe as Inner Pressure Sheath[J]. Ocean Engineering Equipment and Technology, 2014, 1(1): 76-79.

Figures/Tables 6

Table 1

Table 2

Table 3

Table 4

序号	机筒				连接体	机头	口模	工艺性能
序号	一区				连接体	二区	三区	四区
1	200	220	230	220	220	220	210	壁厚不均匀, 有凹坑
2	200	220	230	230	220	220	230	壁厚均匀, 表面较光滑
3	210	230	230	230	220	220	230	表面光滑, 壁厚均匀, 外径稳定
4	220	240	240	240	230	230	230	颜色发黄, 挤出量大, 尺寸不稳定

测试温度 /℃	屈服强度 /MPa	拉伸强度 /MPa	断裂伸长率 /%
-20	57.4	52.6	20.8
23	39	30.4	45
80	20	>19	>250(未破坏)
120	9.9	>10	>250(未破坏)

渗透介质	测试温度 /℃	测试压力 /MPa	渗透体积 /(cm³ ·cm·cm^-2 ·s^-1·Pa^-1)
CH₄	111	10	4.2×10^-3
CH₄	130	10	9.0×10^-3
CO₂	130	11	4.7×10^-2
CO₂	130	48.5	5.7×10^-2
H₂S	130	10	1.36×10^-1

[1]	卓震. 聚偏二氟乙烯(PVDF)特性及其在过程工业中应用[J].腐蚀科学与防护技术, 2004, 16(2): 118.
[2]	倪震宇. VDF,PVDF国内外市场及技术进展[J].有机氟工业, 2007(1): 51.
[3]	American Petroleum Institute.ANSI/API Specification 17. Specification for unbonded flexible pipe[S]. Washington: American Petroleum Institute, 2008.

[1]	LUO Shi-yong, WANG De-jun, LIU Xiao-xia, HUANG Jun. Application of Flexible Pipe in Deepwater Subsea Pipeline [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 53-56.
[2]	CHEN Wei, LIANG Xu, CHEN Da-jiang, SONG Ping-na, WANG Ling-yu. Subsea Flexible Pipeline Installation Protection Technology and Application [J]. Ocean Engineering Equipment and Technology, 2018, 5(6): 384-389.
[3]	JIANG Xiao, MA Tao, YUAN Bo, ZHOU Rui-jia. Study on Manufacturing Process of Lashing Bridge on 21 000 TEU Ultra Large Container Ship [J]. Ocean Engineering Equipment and Technology, 2018, 5(5): 351-358.
[4]	GONG Hai-chao, CHEN Wei, GONG Rui, WANG Ling-yu. Development and Application of Pipe Laying System Suitable for Flexible Pipe in Bohai Bay [J]. Ocean Engineering Equipment and Technology, 2017, 4(1): 43-47.
[5]	DAI Zhi-shuang, WANG Hong-xuan, LU Cheng-lin, SONG Ping-na, CHEN Xing, YUAN Xiao-yan. Creep Behaviors of HDPE Applied in Composite Flexible Pipes [J]. Ocean Engineering Equipment and Technology, 2016, 3(2): 135-139.
[6]	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.
[7]	Cheng-lin LU, Lan LI, Ping-na SONG, Jing CAO, Yong SHA, Wei-wei ZHOU. Global Performance Analysis for Deepwater Flexible Riser [J]. Ocean Engineering Equipment and Technology, 2015, 2(2): 88-92.
[8]	Lan LI, Yin-na ZHANG. Design of Static Bend Stiffener for Flexible Pipes [J]. Ocean Engineering Equipment and Technology, 2014, 1(3): 223-226.