• Title, Summary, Keyword: 압력용기

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Man-hour Reduction with a Regulatory Review Program for a Pressure Vessel Design (관련규정 검토 프로그램 활용 시 압력용기 설계시간 단축 효과)

  • Joo, Jung-Min;Yoo, Ho-Seon
    • Plant Journal
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    • v.8 no.1
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    • pp.60-72
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    • 2012
  • In this study to reduce the review time of the pressure vessel regulations pressure vessel legislation review program has been developed. During the course of this research program to develop the domestic construction in a real project, saving 47% of the time was found.

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Processing and Pressure Test of Filament Wound Composite Pressure Vessels for Oxygen Tanks (복합재료 산소 압력용기의 성형 및 내압 시험)

  • 황병선;김병하;김병선;박승범;엄문광
    • Composites Research
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    • v.14 no.3
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    • pp.10-17
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    • 2001
  • A reseach was peformed to develop composite pressure vessels in conjunction with design, fabrication, and test. Fiber pattern and angels were decided by CADFIL software and they were [$liner/15^{\circ}/15^{\circ}/90^{\circ}/18^{\circ}/90^{\circ}/21^{\circ}/21^{\circ}/90^{\circ}$]. Fabrication of bottles were done by 5-axis filament winding machine. During fabrication fiber optic sensors were embedded to measure the strain at points when internal pressure was applied by water pump. Conventional strain gage instrumentation showed the stable test results. The test results were compared to finite element analysis results and they were close each other in strain values. One can see the successful design and fabrication of single boss composite vessels.

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A Study on Measurement of Internal Defects of Pressure Vessel by Digital Shearography(I) (전자 전단 간섭법을 이용한 압력용기의 내부결함 측정에 관한 연구(I))

  • Kang, Young-June;Park, Nak-Kyu;Ryu, Won-Jae;Kim, Kyung-Suk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.4
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    • pp.393-401
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    • 2002
  • Pipelines in power plants, nuclear facilities and chemical industries are often affected by corrosion effects. It is important to inspect the internal defects in pipelines in oder to guarantee safe operational condition. We have taken relatively much time, cost and manpower to use conventional NDT methods because these methods are contact measuring methods. In this paper, we used digital shearography, a laser-based optical method which allows full-field measurement of surface displacement derivatives. This method has many advantages in practical use, such as low sensitivity to environmental noise, simple optical configuration and real time measurement. The experiment was performed with pressure vessels which has different internal cracks and detected internal cracks in the pressure vessels at a real time using phase shifting method.

Analysis of Acoustic Emission Signal for Vehicle CNG Tank Using Wideband Transducer (광대역 탐촉자를 이용한 자동차용 CNG 탱크의 음향방출 신호 분석)

  • Jee, Hyun-Sup;Lee, Jong-O;Ju, No-Hoe;So, Cheal-Ho;Lee, Jong-Kyu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.32 no.1
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    • pp.1-6
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    • 2012
  • This study is damage evaluation for CNG fuel tank during the burst test through the analysis of acoustic emission signals. Kaiser effect until the pressure 420 bar appears, but More than 420 bar by the creep effect appears significantly damaged vessels, and 480 bar pressure, the Kaiser effect of the rising phase was missing. Resonant transducer at 540 bar than 480 bar decreased activity such as energy and count Continually, but increased wideband transducer. In addition, through the rise time or frequency analysis of composite pressure vessels in order to observe the damage mechanisms wideband transducer is more effective than resonant transducer.

Acoustic Emission Application for Aerospace Composite Materials (항공용 복합재료에 대한 음향방출의 활용)

  • Lee, Sang-Ho
    • Journal of the Korean Society for Nondestructive Testing
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    • v.21 no.3
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    • pp.313-318
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    • 2001
  • To establish nondestructive test method for aerospace composite materials, various composite specimens were tested and analyzed using acoutic emission. The hit rate of acoustic emission closely was rotated with crack initiation and propagation. This report also presents defection capability of crack initiation pressure, initial crack active location, and crack propagation using acoustic emission.

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구형 압력용기의 초소성 성형 공정에서 두께변화 예측에 관한 이론해석

  • Yoon, Jong-Hoon;Lee, Ho-Sung;Jang, Young-Soon;Yi, Yeong-Moo
    • Aerospace Engineering and Technology
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    • v.2 no.2
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    • pp.133-141
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    • 2003
  • When superplastic forming process is employed in manufacturing spherical pressure vessel, the thickness and spherical profile are not constant and varies during the forming process. In the current study, theoretical analysis for the prediction of thickness change was carried out under the consideration of membrane theory which has been employed in Kuglov et. al.'s study. Then the thickness of initial blank to obtain the required thickness at the final forming step, the time vs. pressure profile which yields uniform deformation in blank, and the thickness distribution according to the position at each forming step have been determined. The employed model and the developed analytical code were verified throughout comparing the theoretical predictions at each forming stage with the experimental results shown in literature.

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Development of a Design Theory of a Pressure Vessel with Combined Structure of the Metal and the Composite (금속재와 복합재 이종구조물로 된 압력용기의 설계이론 개발)

  • Lee Bang-Eop;Kim Won-Hoon;Koo Song-Hoe;Son Young-Il
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.2
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    • pp.23-30
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    • 2006
  • A thery was developed to design a high pressure vessel with combined structure of the metal and the composite to withstand the pressure of several tens of thousands psias to reduce the weight of the impulse motor which produces high level of thrust within several tens of seconds. The elastic-plastic stress analyses were carried out to prove the validity of the design theory. A combustion chamber of the impulse motor was designed by the design theory, fabricated, and tested by the hydraulic pressure and the static firings. The bursting pressures from the tests were compared to those predicted by the design theory and the stress analyses and found to be almost the same. It will be possible to design the high pressure vessel with combined structure of the metal and the composite very easily by the proposed design theory.

Assessment of Low Velocity Impact Damage of Filament Wound Composite Vessels with Surface Protective Materials (필라멘트 와인딩 복합재 압력용기의 저속충격손상 평가에 관한 연구)

  • Lee, Jang-Ho;Kang, Ki-Weon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.8
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    • pp.2741-2749
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    • 2010
  • This paper presents the impact damage behavior of filament wound composite vessels and the effect of surface protective materials on their impact resistance. Using an instrumented impact testing machine, a series of impact tests was performed on the base panels and the protected panels (panels with surface protective materials of rubber, kevlar/epoxy or glass/epoxy laminates) that were cut from the full scale vessel. And the impact damage parameters were used to identify the effect of protective materials on the damage resistance of composite vessels. Damage resistance of the composite vessels was considerably affected by the protective materials regardless of the shape of the indenters. Among the protective materials, glass/epoxy laminates was the most effective mean for improving the damage resistance of composite vessels.

Natural Aging Effect on the Fiber Tensile Strength of Carbon Epoxy Pressure Vessel (자연 노화에 따른 카본 에폭시 압력용기의 섬유 인장 강도 변화)

  • Hwang, Tae-Kyung;Park, Jae-Byum;Kim, Hyoung-Geun;Doh, Young-Dae
    • Composites Research
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    • v.20 no.2
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    • pp.1-9
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    • 2007
  • To evaluate and investigate the aging characteristics and the structural service lifetime of the CFV(carbon fiber pressure vessel), natural aging tests were carried out using the CFVs, which had been placed and aged at outdoor and indoor laboratories for 10 and 15 years, respectively. To obtain the probabilistic characteristics of ageing characteristics in aged CFVs, inner pressure loading test was conducted with ring specimens taken from aged CFVs. And, to observe the interface morphology of aged CFVs, the micro-photographs were taken by SEM microscope and the fractured interfaces between the carbon fiber and the matrix resin were scrutinized. Based on the Weibull parameters of the tensile failure strain of aged CFVs, the degradation of the 10 and the 15 year aged CFV occur by 19% and 23%, respectively, and the effect of the placement, whether being placed inside the laboratory or not, is not so significant. However, the outer layer protection, such as painting, is found very advantageous to prevent CFV from aging.

A Study on the Pressure Vessel containing tension material used the Prestressed Concept (프리스트레스트 개념을 적용한 긴장재가 구비된 압력용기 연구)

  • Yim, Heon-Wook
    • Journal of Convergence for Information Technology
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    • v.7 no.5
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    • pp.103-109
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    • 2017
  • A pressure vessel is a cylindrical container that accommodates a pressurized fluid. In real life, there are propane canisters and butane canisters. According to data from the Korea Gas Safety Corporation, The number of domestic gas accidents is average 33 cases of domestic gas accidents occurred per year and 20.8 for mobile butane gases. The purpose of this study was to investigate a method to prevent this kind of explosion. Common studies include forced drain through safe holes, forced separation of butane canisters, and manufacturing of high-strength steel. This paper uses a concept that reduces stress inside the cylinder using prestressed method that precede compression. In other words, install a long liner in both ends of the pressure vessel. I want to develop a safety device that acts like a gas intermediate valve.