• Title/Summary/Keyword: 압력용기

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A Study on Model for Gas Venting Characteristic of Pressure Vessel for Propulsion System (추진체계 가압용 압력용기의 기체배출특성 모델에 관한 연구)

  • Hwang, Yoojun;Byun, Jung Joo;Lee, Ju Young;Kim, Kiun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.268-276
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    • 2017
  • Developing a model was carried out to predict the characteristic of a pressure vessel from which the gas was vented through an orifice. An experimental test was conducted on a pressure vessel applicable to a propulsion system so that representative pressure and temperature were measured. Simulations were conducted with models using assumptions considering heat transfer inside the vessel, and the results were compared to those from the experiment. As a result, it was found out that a proposed heat transfer model was proper to predict pressure and temperature of the vented gas comparable to the measured data.

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The Structural Integrity Evaluation of Composite Pressure Vessel Using Acoustic Emission (음향방출을 이용한 복합재 압력용기의 건전성 평가)

  • 이상호;최용규
    • Journal of the Korean Society of Propulsion Engineers
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    • v.1 no.2
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    • pp.1-11
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    • 1997
  • During hydroproof test of composite pressure vessel, acoustic emission signal was measured and analyzed to evaluate structural integrity of composite motor case. When pressure was held for 1 min. at constant pressure from low pressure level to high pressure level, the pattern of hit rate of good composite pressure vessel is increased with higher value than that of bad composite pressure vessel. This report also presents detection possibility of burst location approximately in the range of 25∼36% of burst pressure using energy rate. In case that it is difficult to detect burst location of composite motor case, it is possible to detect burst location, i.e. structurally weak location of composite pressure vessel with applying same pressure lower than maximum expected operating pressure(MEOP) repeatedly.

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A Study on Measurement of Internal Defects of Pressure Vessel by Digital Shearography(II) (전자 전단 간섭법을 이용한 압력용기의 내부결함 측정에 관한 연구(II) (전자 전단 간섭법을 이용한 압력용기의 내부결함 검출 시스템의 오차 분석))

  • Kang, Young-June;Park, Nak-Kyu;Ryu, Won-Jae;Kim, Dong-Woo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.4
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    • pp.402-410
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    • 2002
  • Recently the necessity of study on optical measuring method using laser to detect the pipeline's defect in nuclear facilities, chemical industries and power plants has been increased. Because laser light can be delivered to a remote area without any difficulties, the application of laser in many industries can solve several difficulties from the limitation of access in danger area and reduce the risks of workers. Therefore, we applied a new experimental technique to the measurement of internal defects in pressure vessels with the combination of shearography and image processing technique and detected the internal cracks of pressure vessels in the former paper. In this paper, we used the same optical system as in the former study and found the optimum shearing magnitude by comparing the real length of specimen with experimental results. A variety of conditions were applied to certify the validity of this method. Actually, several specimens which have different lengths and depths were used in this experiment under the three diverse pressure. Consequently, we have carried out this experiment to determine the limit of measurement ability with analyzing errors.

개량형 경수로 격납용기내 재장전수탱크의 수위계측기 선정

  • 한규성;박순희;최현호;김인식;손갑헌
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.550-555
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    • 1996
  • 기존 발전소의 재장전수탱크는 격납용기 외부에 설치되어 있으며, 압력/차압 계측기를 이용하여 재장전 수탱크 수위를 측정하고 있다. 한편, 개량형 경수로기 경우에는 재장전수탱크를 격납용기 하부에 설치하도록 되어 있으므로 격납용기 벽이나 수집체적조 및 원자로 공동과 인접하게 되어 수위감시를 위한 압력/차압 계측기를 격납용기내에 설치하는 것은 매우 어려울 것으로 판단된다. 따라서, 본 논문에서는 격납용기내 재장전수탱크, 수집체적조 및 원자로 공동 수위계측기에 적용되는 미국 원자력규제위원회 및 전력연구소의 설계기준, 환경 및 기기생존 요건들을 검토한 후, 이에 따라 이 계측기들이 유지해야 할 설계 기능요건을 평가하고, 수위계측기의 형태 선정에 필요한 설계고려사항들을 파악하여 개량형 원자로의 해당 수위계측기의 선정 및 설계와 관련된 개념들을 설명하였다. 검토결과, 격납용기내 재장전수탱크 수위지시를 위해서는 압력/차압 계측기를 격납용기 외부에 설치하고, 수집체적조 및 원자로 공동의 수위감시를 위해서는 부유형 감지기를 사용하는 것이 발전소 운전 및 보수측면에서 장점이 있는 것으로 판단되어 이를 개량형 경수로 설계에 적용할 것을 제안하고자 한다.

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Numerical Study on the Strength Safety of High Pressure Gas Cylinder (고압가스 압력용기의 강도안전성에 관한 수치해석적 연구)

  • Kim, Chung-Kyun;Kim, Seung-Chul
    • Journal of the Korean Institute of Gas
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    • v.14 no.2
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    • pp.1-6
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    • 2010
  • The strength safety of high pressure gas cylinder has been analyzed by using a finite element method. In this study, the internal gas pressures of a steel bombe include a service charging pressure of $9kg/cm^2$, high limit charging pressure of $18.6kg/cm^2$, high limit of safety valve operation pressure $24.5kg/cm^2$, and hydraulic testing pressure of $34.5kg/cm^2$. The computed FEM results indicate that the strength safety for a service charging pressure of $9kg/cm^2$ and high limit charging pressure of $18.6kg/cm^2$ is safe because the stress of a gas cylinder is within yield strength of steel. But the stress for a hydraulic testing pressure of $34.5kg/cm^2$ sufficiently exceeds the yield strength and remains under the tensile strength. If the hydraulic testing pressures frequently apply to the gas cylinder, the bombe may be fractured because a fatigue residual stress is accumulated on the lower round end plate due to a plastic deformation. The computed results show that the concentrated force in which is applied on a skirt zone does not affect to the lower round end plate, and the most weak zone of a bombe is a middle part of a lower round end plate between a bombe body and a skirt for a gas pressure. Thus, the FEM results show that the profile of a lower round end plate is an important design parameter of a high pressure gas cylinder.

Evaluation on Radioactive Waste Disposal Amount of Kori Unit 1 Reactor Vessel Considering Cutting and Packaging Methods (고리 1호기 원자로 압력용기 절단과 포장 방법에 따른 처분 물량 산정)

  • Choi, Yujeong;Lee, Seong-Cheol;Kim, Chang-Lak
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.14 no.2
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    • pp.123-134
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    • 2016
  • Decommissioning of nuclear power plants has become a big issue in South Korea as some of the nuclear power plants in operation including Kori unit 1 and Wolsung unit 1 are getting old. Recently, Wolsung unit 1 received permission to continue operation while Kori unit 1 will shut down permanently in June 2017. With the consideration of segmentation method and disposal containers, this paper evaluated final disposal amount of radioactive waste generated from decommissioning of the reactor pressure vessel in Kori unit 1 which will be decommissioned as the first in South Korea. The evaluation results indicated that the final disposal amount from the top and bottom heads of the reactor pressure vessel with hemisphere shape decreased as they were cut in smaller more effectively than the cylindrical part of the reactor pressure vessel. It was also investigated that 200 L and 320 L radioactive waste disposal containers used in Kyung-Ju disposal facility had low payload efficiency because of loading weight limitation.

Research on Laminate Design Parameters to Maximize Performance Index of Composite Pressure Vessel (복합재 압력용기의 성능지수 최대화를 위한 적층 설계변수 연구)

  • Jeong, Seungmin;Hwang, Taekyung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.529-535
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    • 2017
  • In this paper the laminate design parameters are researched to maximize the performance index of a composite pressure vessel. The pressure-resistant performance and the light-weight concept with contained internal space are implied in the performance index. To maximize the performance index, the three design variables that the thickness of each of helical and hoop layers and the length of hoop layer are considered under the assumption of fixed internal space. To optimize the variables, the response surface method is introduced for construction of the surrogate model and the ANOVA(analysis of variance) is performed to evaluate the effects of the variables. The optimization problem is formulated to maximize performance index under the burst pressure constraint. To verify the effectiveness of the research, numerical analyses are performed for the optimum model.

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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.

FMEA 를 이용한 보일러사고 원인의 정성적 분석

  • 윤상권;문준식;장통일;임현교
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • pp.299-302
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    • 2001
  • 동력으로서 중요한 역할을 하고 있는 증기의 사용이 증가함에 따라 보일러 및 압력용기가 다양화되고, 용기의 기능도 구조면에서나 성능 면에서 현저한 발달을 보이고 있으며, 그 보급대수도 꾸준히 증가하고 있다. 이러한 상황하에서 보일러나 압력용기에 관련되는 재해발생은 관계자들의 노력으로 감소하고는 있지만, 아직도 재해사고는 발생하고 있으며 일단 사고가 발생하게 되면 많은 사상자가 생기고 인적 물적 피해와 더불어, 사고 당사자 뿐만 아니라 사회적·국가적으로 그 피해가 파생되어 많은 문제를 야기시키게 된다.(중략)

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압력 기기 용접부 검사 자동화 시스템 - 원자로 자동 탐상 시스템 압력 배관 자동 탐상기 -

  • 김재희
    • Nuclear industry
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    • v.19 no.12
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    • pp.59-65
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    • 1999
  • 원자력발전소는 우라늄 핵연료를 태워서 물을 끓여 증기를 발생시키고 이 고압 증기로 터빈을 돌려 전기를 생산하는데, 이와 같은 일련의 과정은 고압 용기나 배관을 사용하여 가능하게 된다. 이와 같은 고압 용기 및 고압 배관은 그 기기 안에 핵반응 물질이 들어 있다는 점을 고려해 볼 때 그 기기의 건전성 확보는 매우 중요한 일 중 하나이다. 본고에서는 원자력발전소의 원자로 압력 용기를 비롯하여 압력 배관의 용접부에 대한 결함 탐지에 사용되는 자동 초음파 탐상 기기에 관하여 서술하고자 한다.

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