Numerical study on sealing characteristic of rubber X-ring exposed to high-pressure hydrogen by considering swelling effect

2019 ◽  
Vol 71 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Chilou Zhou ◽  
Mohan He ◽  
Guohua Chen ◽  
Saihua Jiang
Keyword(s):  
High Pressure ◽  
Numerical Study ◽  
Mechanical Damage ◽  
Element Analysis ◽  
Content Type ◽  
User Subroutine ◽  
Sealing Performance ◽  
Ring Seal ◽  
Insight Into ◽  
Pressure Hydrogen

Purpose This paper aims to investigate the sealing characteristic of the rubber X-ring combined seal used in high-pressure hydrogen service and clarify the effect of swelling due to dissolved hydrogen on the sealing behavior. Design/methodology/approach A finite element analysis method with a user subroutine is proposed to investigate the sealing characteristic of rubber X-ring seals in conjunction with the swelling effect. Findings The swelling has a noticeable impact on the sealing behavior. The higher peak contact stress suggests that the X-ring seal may be superior to the O-ring seal, while the calculated increase in Mises stress suggests the X-ring exhibits a higher propensity to mechanical damage under low pressure conditions. Originality/value This paper describes a method with a user subroutine developed within ABAQUS to simulate the sealing performance coupled hydrogen swelling. The suitability of X-ring seals is evaluated. This work provides insight into the swelling effect on sealing behavior of an X-ring, which is of great value for the design and application of rubber seals used in hydrogen service.

A Study of the Sealing Performance of a New High-Pressure Cone Valve for Deep-Sea Gas-Tight Water Samplers

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Shi-Jun Wu ◽  
Can-Jun Yang ◽  
Ying Chen ◽  
Yan-Qing Xie
Keyword(s):  
Finite Element Analysis ◽  
High Pressure ◽  
Deep Sea ◽  
Hydrothermal Fluid ◽  
Contact Model ◽  
Element Analysis ◽  
Sea Trial ◽  
Sealing Performance ◽  
Pressure Cone ◽  
Gas Tight

The cone valve plays an important role in high-pressure sealing applications. In this paper, a new high-pressure cone valve, based on the titanium alloy poppet-to-polyetheretherketone seat sealing structure, is proposed for deep-sea gas-tight water samplers. In order to study the sealing performance of the new valve, both the conforming poppet-seat contact model and the nonconforming poppet-seat contact model were evaluated. Finite element analysis based on the two models was performed and validated by experiments. The results indicate that the nonconforming poppet-seat contact model has a better sealing performance than the conforming poppet-seat contact model. The new cone valve also was applied in a gas-tight hydrothermal fluid sampler and successfully tested in a sea trial during the KNOX18RR cruise from 9 July to 12 August 2008.

Numerical study on the mechanism of spontaneous ignition of high-pressure hydrogen in the L-shaped tube

2020 ◽  
Vol 45 (56) ◽  
pp. 32730-32742
Author(s):  
Liang Gong ◽  
Kaiyan Jin ◽  
Shengnan Yang ◽  
Zeyu Yang ◽  
Zhisheng Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Numerical Study ◽  
Spontaneous Ignition ◽  
Shaped Tube ◽  
Pressure Hydrogen

Effect of δ-ferrite on susceptibility to hydrogen embrittlement of 304 austenitic stainless steel in high-pressure hydrogen atmosphere

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fan Bao ◽  
Kaiyu Zhang ◽  
Zhengrong Zhou ◽  
Wenli Zhang ◽  
Xiao Cai ◽  
...  
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Hydrogen Embrittlement ◽  
Hydrogen Gas ◽  
304 Stainless Steel ◽  
Content Type ◽  
Gas Environment ◽  
Type 304 ◽  
Pressure Hydrogen

Purpose The purpose of this paper is to demonstrate the effect of δ-ferrite on the susceptibility to hydrogen embrittlement of type 304 stainless steel in hydrogen gas environment. Design/methodology/approach The mechanical properties of as-received and solution-treated specimens were investigated by the test of tensile and fatigue crack growth (FCG) in 5 MPa argon and hydrogen. Findings The presence of δ-ferrite reduced the relative elongation and the relative reduction area (H2/Ar) of 304 stainless steel, indicating that δ-ferrite increased the susceptibility of hydrogen embrittlement in 304 stainless steel. Moreover, δ-ferrite promoted the fatigue crack initiation and propagation at the interface between δ-ferrite and austenite. The FCG tests were used to investigate the effect of δ-ferrite on the FCG rate in hydrogen gas environment, and it was found that δ-ferrite accelerated the FCG rate, which was attributed to rapid diffusion and accumulation of hydrogen around the fatigue crack tip through δ-ferrite in high-pressure hydrogen gas environment. Originality/value The dependence of the susceptibility to hydrogen embrittlement on δ-ferrite was first investigated in type 304 steel in hydrogen environment with high pressures, which provided the basis for the design and development of a high strength, hydrogen embrittle-resistant austenitic stainless steel.

Numerical Study on Characteristics of High-Pressure Hydrogen Gas Flow in a Critical Nozzle

2019 ◽  
Vol 2019.72 (0) ◽  
pp. D15
Author(s):  
Shigeru MATSUO ◽  
Yusuke FUKUSHIMA ◽  
Kazuki NIIBAYASHI ◽  
Toshihiro MORIOKA ◽  
Naoya SAKODA ◽  
...  
Keyword(s):  
High Pressure ◽  
Gas Flow ◽  
Numerical Study ◽  
Hydrogen Gas ◽  
Critical Nozzle ◽  
Pressure Hydrogen

Parameter optimization of sealing performance for packer rubber

2019 ◽  
Vol 71 (5) ◽  
pp. 664-671
Author(s):  
Fuying Zhang ◽  
Hao Che Shui ◽  
Yufei Zhang
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Response Surface ◽  
Inclination Angle ◽  
Rubber Tube ◽  
Test Results ◽  
Element Analysis ◽  
Content Type ◽  
Sealing Performance ◽  
Maximum Contact

Purpose The purpose of this paper is based on the response surface method, the authors determined the conditions for achieving the optimum rubber-sealing performance by using the maximum contact stress as the response value. Design/methodology/approach A two-dimensional model of a compression packer rubber was established by finite-element analysis software. Under the single axial load of 53.85 MPa, the four single factors of the end-face inclination angle, subthickness, height of rubber and friction coefficient of the rubber were analyzed. Findings Results show that the optimum sealing performance of the rubber tube is achieved when the end-face angle is equal to 45º and the thickness of the rubber tube is 9 mm. The response surface designed by Box–Behnken shows that the sealing performance of the rubber tube is the optimum when the end-face inclination angle is 48.1818°, the subthickness is 9 mm, the height of rubber is 90 mm and the friction coefficient is 0.1. Verification test results show that the model is reliable and effective. Originality/value Packer operations are performed downhole, and research on real experiments is limited. In this work, the feasibility of such experiments is determined by comparing finite-element modeling with actual experiments, and the results have guiding significance for actual downhole operations.

scholarly journals A Numerical Simulation on the Leakage Event of a High-Pressure Hydrogen Dispenser

2021 ◽  
Vol 12 (4) ◽  
pp. 259
Author(s):  
Benjin Wang ◽  
Yahao Shen ◽  
Hong Lv ◽  
Pengfei He
Keyword(s):  
High Pressure ◽  
Numerical Study ◽  
Large Mass ◽  
Hydrogen Fuel Cell ◽  
Hydrogen Fuel ◽  
Working Pressure ◽  
Hydrogen Fuel Cell Vehicles ◽  
Long Time ◽  
Increasing Demand ◽  
Pressure Hydrogen

For the sake of the increasing demand of hydrogen fuel cell vehicles, there are more concerns on the safety of hydrogen refueling stations. As one of the key pieces of equipment, the hydrogen dispenser has drawn attention on this aspect since it involves massive manual operations and may be bothered by a high probability of failure. In this paper, a numerical study is conducted to simulate the possible leakage events of the hydrogen dispenser based on a prototype in China whose working pressure is 70 MPa. The leakage accident is analyzed with respect to leakage sizes, leak directions, and the time to stop the leakage. It is found that, due to the large mass flow rate under such high pressure, the leak direction and the layout of the components inside the dispenser become insignificant, and the ignitable clouds will form inside the dispenser in less than 1 s if there is a leakage of 1% size of the main tube. The ignitable clouds will form near the vent holes outside the dispenser, which may dissipate quickly if the leakage is stopped. On the other hand, the gas inside the dispenser will remain ignitable for a long time, which asks for a design with no possible ignition source inside. The results can be useful in optimizing the design of the dispenser, regarding the reaction time and sensitivity requirements of the leakage detector, the size and amount of vent holes, etc.

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