Introduction of Scenario for Safe Use of Welded Joints Under High Pressure Hydrogen Gas

2017 ◽  
Author(s):  
Hajime Fukumoto ◽  
Hiroshi Kobayashi ◽  
Shinji Oshima ◽  
Kazunori Kawamata
Keyword(s):  
High Pressure ◽  
Fuel Cell ◽  
Significant Loss ◽  
Hydrogen Gas ◽  
Fuel Cell Vehicle ◽  
Stable Operation ◽  
Demonstration Program ◽  
Mechanical Joints ◽  
The Past ◽  
Pressure Hydrogen

Japan began constructing and upgrading HRS (Hydrogen Refueling Stations) for its FCV (Fuel Cell Vehicle) demonstration program in 2002, as shown in Fig. 1. In 2013, Japanese energy providers started constructing commercial HRS for refueling FCV with 70 MPa hydrogen, and almost 100 HRS are now in service. Maintaining the reliability of refueling equipment is essential for safe, stable operation of commercial HRS. However, as a result of experience with commercial HRS operation during the past few years, Japanese energy providers have recognized that maintenance for small leaks from cone and thread mechanical joints involves a significant loss of resources.

Development of New Material Testing Apparatus in High-Pressure Hydrogen and Evaluation of Hydrogen Gas Embrittlement of Metals

2007 ◽  
Author(s):  
Seiji Fukuyama ◽  
Masaaki Imade ◽  
Kiyoshi Yokogawa
Keyword(s):  
High Pressure ◽  
Stainless Steels ◽  
Pressure Vessel ◽  
Austenitic Stainless Steels ◽  
Material Testing ◽  
Hydrogen Gas ◽  
Stage Ii ◽  
Fuel Cell Vehicle ◽  
Stage Iii ◽  
Pressure Hydrogen

A new type of apparatus for material testing in high-pressure gas of up to 100 MPa was developed. The apparatus consists of a pressure vessel and a high-pressure control system that applies the controlled pressure to the pressure vessel. A piston is installed inside a cylinder in the pressure vessel, and a specimen is connected to the lower part of the piston. The load is caused by the pressure difference between the upper room and the lower room separated by the piston, which can be controlled to a loading mode by the pressure valves of the high-pressure system supplying gas to the vessel. Hydrogen gas embrittlement (HGE) and internal reversible hydrogen embrittlement (IRHE) of austenitic stainless steels and iron- and nickel-based superalloys used for high-pressure hydrogen storage of fuel cell vehicle were evaluated by conducting tensile tests in 70 MPa hydrogen. Although the HGE of these metals depended on modified Ni equivalent, the IRHE did not. The HGE of austenitic stainless steels was larger than their IRHE; however, the HGE of superalloys was not always larger than their IRHE. The effects of the chemical composition and metallic structure of these materials on the HGE and IRHE were discussed. The HGE of austenitic stainless steels was examined in 105 MPa hydrogen. The following were identified; SUS304: HGE in stage II, solution-annealed SUS316: HGE in stage III, sensitized SUS316: HGE in stage II, SUS316L: HGE in FS, SUS316LN: HGE in stage III and SUS310S: no HGE.

Materials Safety for Hydrogen Gas Embrittlement of Metals in High-Pressure Hydrogen Storage for Fuel Cell Vehicles

2012 ◽  
Author(s):  
L. Zhang ◽  
M. Wen ◽  
Z. Y. Li ◽  
J. Y. Zheng ◽  
X. X. Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Cell ◽  
Hydrogen Storage ◽  
Crack Growth ◽  
Hydrogen Gas ◽  
Materials Testing ◽  
Fuel Cell Vehicles ◽  
Growth Data ◽  
Type Iii ◽  
Pressure Hydrogen

Materials safety and selection for the application of metals in high-pressure hydrogen storage of fuel cell vehicles were introduced based on the hydrogen gas embrittlement (HGE) examinations using the materials testing equipment. Testing steps are as follows; the 1st step is the tensile test in high-pressure hydrogen by slow strain rate technique to evaluate the effect of hydrogen and divide the materials into five categories based on stress-strain curves. The materials of type III, IV and V are picked up and their yield points and ultimate tensile strengths are collected. The 2nd step is the fracture mechanics test to obtain KICs and KIHs of type III, IV and V materials. The materials of type IV and V are considered to be applicable as usual. The 3rd step is the crack growth test to obtain the fatigue crack growth data. A special consideration of HGE is taken for the design of the equipment with limited operation period or cycles for the materials of type III. The issue of the Kth’s reproducibility remains unresolved, which calls another testing method and design concept. Candidate materials are then nominated following the procedure of materials selection.

scholarly journals The Evaluation of Hydrogen Leakage Safety for the High Pressure Hydrogen System of Fuel Cell Vehicle

2012 ◽  
Vol 23 (4) ◽  
pp. 316-322 ◽  
Author(s):  
Hyun-Ki Kim ◽  
Young-Min Choi ◽  
Sang-Hyun Kim ◽  
Ji-Hyun Shim ◽  
In-Chul Hwang
Keyword(s):  
High Pressure ◽  
Fuel Cell ◽  
Fuel Cell Vehicle ◽  
Hydrogen System ◽  
Pressure Hydrogen

Effects of High Pressure Hydrogen on Wear of PTFE and PTFE Composite

2009 ◽  
Author(s):  
Y. Sawae ◽  
K. Nakashima ◽  
S. Doi ◽  
T. Murakami ◽  
J. Sugimura
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Wear Behavior ◽  
Wear Test ◽  
Passive Layer ◽  
Hydrogen Gas ◽  
Fuel Cell Vehicle ◽  
316L Austenitic Stainless Steel ◽  
Sealing Materials ◽  
Pressure Hydrogen

Machine components in the fuel cell vehicle and related hydrogen infrastructures are operating within high pressure hydrogen gas. Especially, polymer seals used in gas compressors and regulator valves should be articulating against their metal counter face in pressurized hydrogen gas. However, the effect of high pressure hydrogen gas on tribological behavior of sliding surfaces has not been identified yet. In this study, effects of the pressurized hydrogen gas environment on wear behavior of polymeric sealing materials were examined by exposing polymer specimens and their sliding counterface to the high pressure hydrogen gas prior to the wear test. Unfilled polytetrafluoroethylene (PTFE) and 15% graphite filled PTFE were tested as representative polymer sealing materials and 316L austenitic stainless steel was used as a sliding counterface. Results of X-ray photoelectron spectrometer (XPS) analysis of the exposed stainless surface indicated that metal oxides in the surface passive layer of 316L stainless steel could be reduced to some extent by high pressure hydrogen. Increased metal contents of the stainless surface enhanced the development of polymer transfer film and consequently lower the specific wear rate of PTFE and PTFE composites.

scholarly journals Test Method to Establish Hydrogen Compatibility of Materials in High Pressure Hydrogen Gas Environments for Fuel Cell Vehicles

2021 ◽  
Vol 61 (4) ◽  
pp. 1333-1336
Author(s):  
Mitsuo Kimura ◽  
Nobuhiro Yoshikawa ◽  
Hiroaki Tamura ◽  
Takashi Iijima ◽  
Ayumu Ishizuka ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Cell ◽  
Hydrogen Gas ◽  
Test Method ◽  
Fuel Cell Vehicles ◽  
Compatibility Of Materials ◽  
Pressure Hydrogen

Study on Fatigue Characteristics of CFRP

2018 ◽  
Author(s):  
Tatsumi Takehana ◽  
Toshihiro Yamada ◽  
Takeru Sano ◽  
Katsuyuki Kimura ◽  
Tetsuji Miyashita ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Cell ◽  
Carbon Fiber ◽  
Hydrogen Gas ◽  
Carbon Fiber Reinforced Plastic ◽  
Fuel Cell Vehicles ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Fatigue Characteristics ◽  
Pressure Hydrogen

With the widespread use of fuel cell vehicles in recent years, the development of hydrogen containers for vehicles and accumulators for hydrogen refueling stations has been actively carried out. For these containers and accumulators, in addition to being lightweight and combination of materials that don’t deteriorate with high-pressure hydrogen gas, composite containers using carbon fiber reinforced plastic (CFRP) have attracted attention.

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