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Research Papers: Operations, Applications and Components

Reliability Assessment of the Water Distributing Valve of a Hydrostatic Sediment Corer

[+] Author and Article Information
Huawei Qin

Associate Professor
The Institute of Mechatronic Engineering,
Hangzhou Dianzi University,
Hangzhou 310018, China
e-mail: qinhw@hdu.edu.cn

Hangmin Hu

The Institute of Mechatronic Engineering,
Hangzhou Dianzi University,
Hangzhou 310018, China
e-mail: hu_hangmin@163.com

Wei Ye

Department of Engineering,
University of Wolverhampton,
Telford TF2 9NT, UK
e-mail: wei.ye07@wlv.ac.uk

Jianjun Wang

Shanghai Institute of Aerospace
Systems Engineering,
Shanghai 201108, China
e-mail: wangjianjun@zju.edu.cn

Zhen Cai

The Institute of Mechatronic Engineering,
Hangzhou Dianzi University,
Hangzhou 310018, China
e-mail: opposite913@gmail.com

Ying Chen

Professor
Department of Ocean Science and Engineering,
Zhejiang University,
Hangzhou 310058, China
e-mail: ychen@zju.edu.cn

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 14, 2013; final manuscript received February 21, 2014; published online September 4, 2014. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 136(6), 061601 (Sep 04, 2014) (7 pages) Paper No: PVT-13-1065; doi: 10.1115/1.4026979 History: Received April 14, 2013; Revised February 21, 2014

The hydrostatic corer is designed for sampling sediment from the seafloor. Its operation relies on a water distributing valve which converts the potential pressure difference between ambient seawater and a built-in chamber with atmospheric pressure to the dynamic energy as the driving power. As the valve is exposed to the ambient water, the deformation of its components may exceed their fitting tolerance under the high pressure and low temperature on seafloor, and thus cause the failure of the valve. Three possible failure modes have been taken into account, representing the positions where interference of fitting tolerance is likely to occur. Corresponding models are then created considering the coupled effects of pressure and temperature on the valve. Based on the model results and the reliability requirement of the corer, one failure mode is selected to calculate the reliability of the valve and is used as guidance for the future improvement of the design.

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References

Figures

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Fig. 1

A portion of the schematic profile of the sediment corer

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Fig. 4

Theoretic Model for the valve core

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Fig. 5

Finite element model for the valve core

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Fig. 6

Horizontal nodal displacement of the valve core under 55.6 MPa pressure

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Fig. 7

The submarine topography of the South China Sea [11]

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Fig. 8

PDF and CDF of variable: (a) PDF of variable and (b) CDF of variable

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Fig. 9

Temperature–depth relationship [15]

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Fig. 10

Curve fitting for the temperature–depth relationship

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Fig. 11

PDF and CDF of variable: (a) PDF of variable and (b) CDF of variable

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