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SPECIAL SECTION PAPERS

Composite Cylinders for Deep Sea Applications: An Overview

[+] Author and Article Information
Peter Davies

Marine Structures Laboratory,
Centre Bretagne,
IFREMER,
Plouzané F29280, France
e-mail: peter.davies@ifremer.fr

Dominique Choqueuse

Marine Structures Laboratory,
Centre Bretagne,
IFREMER,
Plouzané F29280, France
e-mail: dominique.choqueuse@sfr.fr

Benoît Bigourdan

Marine Structures Laboratory,
Centre Bretagne,
IFREMER,
Plouzané F29280, France
e-mail: Benoit.Bigourdan@ifremer.fr

Pierre Chauchot

Marine Structures Laboratory,
Centre Bretagne,
IFREMER,
Plouzané F29280, France
e-mail: pierre.chauchot@orange.fr

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 24, 2016; final manuscript received June 7, 2016; published online July 18, 2016. Editor: Young W. Kwon.

J. Pressure Vessel Technol 138(6), 060904 (Jul 18, 2016) (8 pages) Paper No: PVT-16-1028; doi: 10.1115/1.4033942 History: Received February 24, 2016; Revised June 07, 2016

In order to develop the knowledge base necessary to design deep sea pressure vessels, it is essential to understand the full chain from design and manufacturing through nondestructive testing (NDT) and characterization to long-term behavior under hydrostatic pressure. This paper describes results from European and national research programs focusing on the use of composites for underwater applications over the last 20 years. Initial tests on small glass/epoxy cylinders were followed by large demonstration projects on carbon/epoxy cylinders with implosion pressures of up to 600 bar, corresponding to 6000 m depth. Numerical modeling has enabled end closures design to be optimized for test performance. Thin and thick wall cylinders have been tested under quasi-static, and long-term loading. Both thermosetting and thermoplastic matrix composites have been tested to failure, and the influence of defects and impact damage on implosion pressure has been studied. These deep sea exploitation and exploration studies were performed for oceanographic, military, and offshore applications, and extensive data are available. The aim of this paper is to indicate existing results, particularly from European projects, in order to avoid costly repetition.

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References

Figures

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Fig. 1

Examples of composite cylinders before and after test

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Fig. 2

Ultrasonic C-scan inspection map of thick (50 mm) 175 mm inner diameter carbon/epoxy filament wound cylinder. Vertical dimension is cylinder length (300 mm). Dark areas correspond to delaminations.

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Fig. 3

Finite element (FE) models of cylinder end closure contact (left image: contact on end and right image: end and inner wall contacts)

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Fig. 4

Five-hundred millimeter inner diameter carbon/epoxy cylinder with composite dome in pressure vessel before implosion test

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Fig. 5

Forty millimeter thick carbon/epoxy composite cylinder before implosion test

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Fig. 6

Example of inner wall midlength strain recordings during implosion test showing mode 2 buckling

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Fig. 7

Instrumented glass/epoxy cylinders for long term immersion tests at 2500 m depth, and example of inner wall midlength strains versus immersion time

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Fig. 8

Impact damage in carbon/epoxy cylinder wall

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Fig. 9

Influence of impact damage on implosion pressure, glass/epoxy cylinders

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Fig. 10

General view of SEPCOMP subsea oil separation system, designed by Doris Engineering

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Fig. 11

FE analysis of SEPCOMP cylinder

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Fig. 12

Composite versus metal design, SEPCOMP

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Fig. 13

Collapse failure mode of steel/composite hybrid cylinder under hydrostatic pressure

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Fig. 14

Post-test FE analysis of hybrid tube collapse

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