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Research Papers: Design and Analysis

Optimizing Preloading Pressure of Precharged Gas for Isobaric Gas-Tight Hydrothermal Samplers

[+] Author and Article Information
Haocai Huang

Ocean College,
Zhejiang University,
Zhoushan 316021, China;
Laboratory for Marine Geology,
Qingdao National Laboratory for Marine
Science and Technology,
Qingdao 266061, China
e-mail: hchuang@zju.edu.cn

Liang Huang

Ocean College,
Zhejiang University,
Zhoushan 316021, China
e-mail: lianghuang@zju.edu.cn

Wei Ye

Ocean College,
Zhejiang University,
Zhoushan 316021, China
e-mail: nightcat1029@sina.com

Shijun Wu

The State Key Lab of Fluid Power
& Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China
e-mail: bluewater@zju.edu.cn

Canjun Yang

The State Key Lab of Fluid Power &
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China
e-mail: ycj@zju.edu.cn

Ying Chen

The State Key Lab of Fluid Power &
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China
e-mail: ychen@zju.edu.cn

Hangzhou Wang

The State Key Lab of Fluid Power &
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Ocean College,
Zhejiang University,
Zhoushan 316021, China
e-mail: hangzhouwang@zju.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 28, 2017; final manuscript received December 24, 2017; published online January 24, 2018. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 140(2), 021201 (Jan 24, 2018) (9 pages) Paper No: PVT-17-1137; doi: 10.1115/1.4038901 History: Received July 28, 2017; Revised December 24, 2017

Isobaric gas-tight hydrothermal samplers, with the ability to maintain pressure, can be used to keep in situ chemical and biological sample properties stable. The preloading pressure of the precharged gas is a major concern for isobaric gas-tight hydrothermal samplers, especially when the samplers are used at different sampling depths, where the in situ pressures and ambient temperatures vary greatly. The most commonly adopted solution is to set the preloading pressure for gas-tight samplers as 10% of the hydrostatic pressure at the sampling depth, which might emphasize too much on pressure retention; thereby, the sample volume may be unnecessarily reduced. The pressure transition of the precharged gas was analyzed theoretically and modeled at each sampling stage of the entire field application process. Additionally, theoretical models were built to represent the pressure and volume of hydrothermal fluid samples as a function of the preloading pressure of the precharged gas. Further, laboratory simulation and examination approaches were also adopted and compared, in order to obtain the volume change of the sample and accumulator chambers. By using theoretical models and the volume change of the two chambers, the optimized preloading pressure for the precharged gas was obtained. Under the optimized preloading pressure, the in situ pressure of the fluid samples could be maintained, and their volume was maximized. The optimized preloading pressure obtained in this study should also be applicable to other isobaric gas-tight hydrothermal samplers, by adopting a similar approach to pressure maintenance.

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Figures

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Fig. 1

(a) Gas-tight hydrothermal sampler developed by Zhejiang University and (b) schematic diagram of the sample and accumulator chambers used in this study

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Fig. 2

The improved version is taking samples from vents on the Atlantic ridge

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Fig. 3

Schematic profile of the sampling process

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Fig. 4

A typical temperature–depth ocean water profile in low to middle latitudes

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Fig. 5

Equivalent elastic strain and total deformation distribution simulation of the sampler under 30 MPa pressure

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Fig. 6

Photo of sample chamber with resistance strain gauges attached, during the experiment

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Fig. 7

Relationship between the different precharge pressure, different depth, and pressure maintaining performance of the sampler: (a) Ps/Pf-Ppre/Pf curves at different depth and (b) Ps/Pf -H curves at different Ppre/Pf

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Fig. 8

Relationship between the different precharge pressure, different depth, and sampling volume of the sampler; Vs/Va1-Ps/Pf curves at different depth

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Fig. 9

Curve fitting of the optimized precharged internal pressure

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Fig. 10

The optimized internal pressure sampling performance compared to previously suggested 10% of seabed pressure: (a) comparison of pressure maintenance performance and (b) comparison of sampling volume

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