0
research-article

Optimizing Preloading Pressure of Pre-charged gas for Isobaric Gas-tight Hydrothermal Samplers

[+] Author and Article Information
Haocai Huang

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

Liang Huang

Ocean College, Zhejiang University, Zhoushan, China, 316021
lianghuang@zju.edu.cn

Wei Ye

Ocean College, Zhejiang University, Zhoushan, China, 316021
nightcat1029@sina.com

Shijun Wu

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

Canjun Yang

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

Ying Chen

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

Hangzhou Wang

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

1Corresponding author.

ASME doi:10.1115/1.4038901 History: Received July 28, 2017; Revised December 24, 2017

Abstract

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 pre-charged 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 pre-charged 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 pre-charged 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 pre-charged 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.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In