• Title/Summary/Keyword: 내압용기

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Forecasting of Inspection Demand for Pressure Vessels in Hydrogen Fuel Cell Electric Vehicle using Bass Diffusion Model (Bass 확산모델을 이용한 수소전기차 내압용기 검사수요 예측)

  • Kim, Ji-Yu;Kim, Eui-Soo
    • Journal of the Korean Institute of Gas
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    • v.25 no.3
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    • pp.16-26
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    • 2021
  • The global warming problem has arose, the supply eco-friendly vehicles such as HFCEVs is increasing around world and Korea is fully supporting subsidies, tax cut to form an initial market for HFCEVs. The key to the safety of HFCEVs is pressure vessels stored hydrogen, and although these pressure vessels must be inspection regularly, the existing inspection stations are insufficient to meet the demand for inspection. Therefore, it is important to establishment of pressure vessels inspection station for safety management of HFCEVs. In this study, it estimates innovation coefficient, imitation coefficient in Bass model by using electric vehicle sales data, and foretasted the supply of HFCEVs by region & the demand for inspection by region using the Bass diffusion model. As a result, the inspection demand for pressure vessels in HFCEVs in 2040 was 690,759 units, and it was confirmed 191 new inspection stations and 1,124 inspectors were needed to prepare for this.

Shape Change Analysis of a Small Propane Container by Pressure Test (소형프로판용기 내압시험을 통한 용기의 형상변화 분석)

  • Lee, Jong-Sang;Jang, Kap-Man;Lee, Yoon Hyoung;Yim, Sang-Sik;Lee, Jin-Han
    • Journal of the Korean Institute of Gas
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    • v.18 no.6
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    • pp.40-44
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    • 2014
  • In this study, it is analyzed that a change in the shape of small propane containers made of STS304 when increasing of internal pressure. When internal pressure of a small propane container increased, bottom of end plate is convexly changed. This test is applied to a water bath pressure test to analyze the characteristics of the container. Water bath is able to analyze relationship between internal pressure and volume. In result, shape change section is confirmed because bottom of end plate is convexly changed. In addition, this section tend to decrease internal pressure because a volume increment increase out of proportion to pressure. The results of this study are expected to contribute to improving the safety of the pressure vessel, as well as various small propane container.

원자로 RI 생산용 조사용기 제작 및 시험

  • 박울재;한현수;조운갑;홍순복;이철영
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.763-768
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    • 1998
  • 방사성동위원소 생산용 표적을 중성자 조사하기 위해 하나로의 제반 특성을 고려하여 조사용기를 개발하였다 IP(Isotope Production), HTS(Hydraulic Transfer System) 조사공별로 내.외부용기를 제작하였으며 재료는 검증된 Al-1050을 사용하였다. 내부용기는 냉간용접(Cold Welding) 하고, 외부용기는 TIG(Tungsten Inert Gas) 또는 전자빔으로 용접한 후 He을 충진하고 밀봉하였다. 조사용기의 건전성을 입증하기 위해 기포누설시험, 내압시험, 가열시험, 침투탐상시험, He 누설시험을 수행하였다. 기포누설시험 결과 내부용기는 90% 이상이 3x$10^{-6}$atm.cc/sec 이하의 누설율을 보였고, 내압시험 결과 파단압력은 28kg/$\textrm{cm}^2$ 정도였다. 외부용기는 TIG 용접시 70%, 전자빔 용접시 90% 이상이 누설율 1x$10^{-8}$atm.cc/sec 이하였다. 개발된 조사용기를 사용하여 하나로에서 200여회 방사성동위원소를 생산하였으나 중성자 조사중 누출을 포함한 기타의 문제가 발생하지 않았다. 조사용기 개발에서 확립된 밀봉시험, 내압시험 및 가열시험 방법은 기체표적이나 내압이 발생하는 표적용기의 개발 및 시험에 응용할 수 있다.

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High Temperature Tensile Stress Behavior of Hydrogen Vessel Composite Materials for Hydrogen Fuel Cell Bus (수소버스용 내압용기 복합재의 열적환경에 따른 기계적 물성 연구)

  • Hyunseok, Yang;Woo-Chul, Jung;Kwang Bok, Shin;Man-Sik, Kong
    • Composites Research
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    • v.35 no.6
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    • pp.425-430
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    • 2022
  • In this study, the mechanical properties of the pressure vessel composite exposed to the thermal environment were evaluated to establish the standard for high temperature static pressure test of the pressure vessel for hydrogen bus. As the tensile strength of the composite material approaches the glass transition temperature of the epoxy resin, the strength decreases due to the deterioration of the epoxy resin. In addition, it was confirmed that the tensile strength increased again due to the post-curing of the epoxy resin during long-term exposure. Therefore, the accelerated stress rupture test conditions of the pressure vessel for the hydrogen bus should be set based on the epoxy resin properties of the carbon fiber composite material.

A Study on the Propensity for the Deformation and Failure of a Small Pressurized Cylinder (소형 압력 용기의 변형 및 파열 경향에 대한 연구)

  • Yim, Sang-Sik;Jang, Kap-Man;Lee, Jin-Han;Choi, Ye-Roo;Kim, Ki-Bum
    • Journal of Energy Engineering
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    • v.23 no.3
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    • pp.146-149
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    • 2014
  • Compared to Butane tank, the propane tank should have a higher compressive strength due to its higher vapor pressure. In this study, a theoretical analysis was performed to evaluate the effect of change in the geometry of bottom plate on the mechanical property of tank, and an experiment was also carried out to observe the propensity of the deformation and failure of the vessel using hydraulic pressurizing device. The compressive strength of the vessel was observed to improve 1.5-2.5 MPa as the curvature of the bottom plate was decreased 62 mm and the thickness of the bottom plate was increased 0.25 mm. This study are expected to provide viable information conducive to achieve on-going development of a small vessel for the pressurized propane gas.

Pressure Vessel Design and Structural Analysis of Unmanned Underwater Vehicle (심해용 무인잠수정의 내압용기 구조설계)

  • Joung, Tae-hwan;Lee, Jae-hwan;Nho, In-Sik;Lee, Pan-mook;Aoki Taro
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.6
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    • pp.140-146
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    • 2004
  • This paper presents the structural analysis of the pressure vessels in the unmanned underwater vehicle (UUV) under developing at KORDi, which consists of a ROV, an AUV and a launcher at 6000 m depth in the ocean. Analytical, linear and nonlinear stress and buckling analysis of cylindrical pressure vessels using FEM (ANSYS) are performed to verify the safety of the current design.

An Experimental Study on Pressure-resistant Performance of a Re-fillable LPG Cylinder (LPG 재충전 소형 용기의 내압성능에 관한 실험적 연구)

  • Yim, Sang-Sik;Jang, Kap-Man;Lee, Jin-Han
    • Journal of the Korean Institute of Gas
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    • v.18 no.2
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    • pp.16-20
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    • 2014
  • In this paper, the performance of pressure-resistance is validated by experiment on LPG re-fillable cylinder which has increased demands for spreading of camp culture. Propane has increased suppliable requirements as fuel because of easily vaporizing effect of low boiling point. However, propane can be occurring safety problems inevitably by high vapor pressure. So, the priority is that safe cylinder should furnish in order to be circulated as safe fuel. LPG re-fillable cylinder for high pressure is tried to furnish internationally, that is restricted by safe issues. For these reasons, the pressurization and rupture are performed by using pressurizing device that is operated by hydraulic system. Also, this paper will offer rupturable characteristics comparing with vapor pressure of propane. This paper is expected as basis research for developing re-fillable cylinder and using standard for supplying them.

The Design, Structural Analysis and High Pressure Chamber Test of a Thick Pressure Cylinder for 2000 m Water Depth (수심 2000m 용 두꺼운 내압용기의 설계, 구조해석과 내압시험)

  • Choi, Hyeuk-Jin;Lee, Jae-Hwan;Kim, Jin-Min;Lee, Seung-Guk;Maring, Kothilngam
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.2
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    • pp.144-153
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    • 2016
  • This paper aims to demonstrate the design, structure analysis, and hydrostatic pressure test of the cylinder used in 2000m water depth. The cylinder was designed in accordance with ASME pressure vessel design rule. The 1.5 times safety factor required by the general rule was applied to the design of the cylinder, because ASME rule is so excessive that it is not proper to apply to the hydrostatic pressure test. The finite element analysis was conducted for the cylinder. The cylinder was produced according to the design. The hydrostatic pressure test was conducted at the hyperbaric chamber in KRISO. The results of finite element analysis(FEM) and those of the hydrostatic pressure test were almost the same, which showed that the design was exact and reliable.