The mechanical properties of the fixture of internal pressure sheath for marine composite flexible pipes

DAI Zhishuang; FENG Yan; SONG Pingna; CHEN Xing

doi:10.6047/j.issn.1000-8241.2018.11.020

Oil & Gas Storage and Transportation > 2018 > 37(11): 1315-1320. > DOI: 10.6047/j.issn.1000-8241.2018.11.020

DAI Zhishuang, FENG Yan, SONG Pingna, CHEN Xing. The mechanical properties of the fixture of internal pressure sheath for marine composite flexible pipes[J]. Oil & Gas Storage and Transportation, 2018, 37(11): 1315-1320. DOI: 10.6047/j.issn.1000-8241.2018.11.020

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The mechanical properties of the fixture of internal pressure sheath for marine composite flexible pipes

Neptune Offshore Engineering Development Co. Ltd.

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Received Date: February 26, 2017
Revised Date: September 04, 2018
Available Online: August 20, 2023
Published Date: September 06, 2018

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Abstract

Abstract

The effective fixing of internal pressure sheath at the end fitting of composite flexible pipe can reduce the leakage risk of transported fluid at the end fitting. In this paper, the fixing form of internal pressure sheath for composite flexible pipes was introduced. Then, its elastic modulus, linear coefficient of thermal expansion, shear strength and compressive stress relaxation property were tested. In addition, its fixing effect was checked on the basis of its properties. It is indicated that the compressive stress applied on the internal pressure sheath attenuates gradually as the time goes, and its decline rate is 83.9% during the designed service lifetime of the pipe. When the teeth of the fixture of internal pressure sheath are completely pressed in the internal pressure sheath, the axial force provided by the fixture in the initial stage can offset the thermal contraction force resulted from pipeline shutdown. If the stress relaxation behavior of internal pressure sheath is taken into account, the axial force provided by its fixture will be decreased and the internal pressure sheath may be pulled out. In order to avoid this risk, the axial force provided by the fixture can be enhanced by increasing the design length and tooth amount of the fixture of internal pressure sheath. The research results can guide the structure design of the fixture and evaluate the valid fixing period of internal pressure sheath.
- internal pressure sheath,
- fixture,
- stress relaxation,
- axial force

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References (24)

References

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