• Title/Summary/Keyword: Chemical Pressure Vessel

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Design Analysis of Butene Storage Spherical Tank (부텐 구형저장조의 설계해석)

  • Ahn, Hee-Jae;Park, Jung-Yean;Lee, Choong-Dong;Lee, Eun-Woo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1994.10a
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    • pp.129-136
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    • 1994
  • Spherical storage tank for chemical plant is analyzed for the loads and their combinations in accordance with Section Ⅷ, Division 2 of the ASME Boiler and Pressure Vessel Code. Design Analysis of Butene storage tank is carried out by utilizing 3-dimensional plate and beam elements of a general purpose finite element program. Two separate 3-D finite element models are used; one for the global analysis of the entire spherical storage tank, the other for the local analysis of junction part and its vicinity of shell-to-supporting structures. The analysis is focused on the equator plate in the shell and the junction part of shell-to-supporting structures.

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Equivalent Mechanical Property for Stress Analysis on Lined Pipe (Lined Pipe의 응력해석을 위한 등가 물성치 계산)

  • Choe, Jae-Seung;Jeong, Jin-Han
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.445-451
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    • 2002
  • The refractory-lined pipe is used to protect the system from high-temperature of the internal flow. The property of the refractory has an effect upon the stress analysis for fluid catalytic cracking(FCC) unit piping design. The equivalent elastic modulus and density considering steel and refractory must be applied in the stress analysis of the system. In the research, the theoretical method to obtain the value of the equivalent property is introduced and then the parametric analysis is carried out to understand the characteristic of the material properties, and the stress analysis is performed with reactor, the part of FCC unit.

Neuro-Fuzzy Contro of Weld Pool Size in Arc Welding Robot System (1st Report : Fuzzy Control of Weld Pool Size) (아크용접 로보트시스템에서 용융지크기의 뉴로-퍼지 제어)

  • Jeon, Euy-Sik
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.4
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    • pp.89-95
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    • 1997
  • Welding technique is widely applied to general industry such as pressure vessel for chemical plant, pipe system, heavy industry, and automobile. There are some points which must be considered when robot system is used in welding automation process for productivity improvement. Welding quality is governed by heat input, and this quantity can be different according to shape, property, and thick of material . For desired heat input , weld input parameters such as welding voltage, current, and welding velocity must be determined with those consideration. Until now these parameters have been determined mainly by experience of operator. In this study, the size of welding zone was predicted by fuzzy rules were constructed from the relation between welding variables and weld pool size. Inverse model method which welding control input for welder is determined with optimum voltage and current by fuzzy controller is validatied by computer simulation.

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Equivalent Elastic Modulus for Lined Pipe Analysis (Lined Pipe 해석을 위한 등가 탄성계수 계산)

  • 정진한;최재승;하대홍
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.547-550
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    • 2000
  • The steel pipe for fluid catalytic cracking(FCC) unit. petroleum refinery, is lined with refractory to protect the system from high-temperature of the internal flow. The property of the refractory has an effect upon the stress analysis of FCC unit. Because 1-D pipe element or 3-D shell element are usually used in commercial codes of stress analysis to evaluate the structural soundness, the equivalent elastic modulus considering steel and refractory should be applied. In the research, the theoretical method to obtain the value of the equivalent property is introduced and then the stress analysis is carried out with the part of FCC unit.

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Do the Health Claims Made for Morinda citrifolia (Noni) Harmonize with Current Scientific Knowledge and Evaluation of its Biological Effects

  • Gupta, Rakesh Kumar;Patel, Amit Kumar
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.8
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    • pp.4495-4499
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    • 2013
  • Morinda citrifolia, also known as Great Morinda, Indian Mulberry, or Noni, is a plant belonging to the family Rubiaceae. A number of major chemical compounds have been identified in the leaves, roots, and fruits of the Noni plant. The fruit juice is in high demand in alternative medicine for different kinds for illnesses such as arthritis, diabetes, high blood pressure, muscle ached and pains, menstrual difficulties, headache, heart diseases, AIDS, gastric ulcer, sprains, mental depression, senility, poor digestion, arteriosclerosis, blood vessel problems, and drug addiction. Several studies have also demonstrated anti-inflammatory, antioxidant and apoptosis-inducing effects of Noni in various cancers. Based on a toxicological assessment, Noni juice was considered as safe. Though a large number of in vitro, and, to a certain extent, in vivo studies demonstrated a range of potentially beneficial effects, clinical data are essentially lacking. To what extent the findings from experimental pharmacological studies are of potential clinical relevance is not clear at present and this question needs to be explored in detail before an recommendations can be made.

Theoretical Analysis of Lined Pipe (Lined Pipe 이론 해석)

  • Jung, Jin-Han;Choi, Jae-Seung
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.964-968
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    • 2001
  • The refractory-lined pipe is used to protect the system from high-temperature of the internal flow. The property of the refractory has an effect upon the stress analysis for fluid catalyst cracking(FCC) unit piping design. The equivalent elastic modulus and density considering steel and refractory must be applied in the stress analysis of the system. In the research, the theoretical method to obtain the value of the equivalent property is introduced and then the parametric analysis is carried out to understand the characteristic of the material properties.

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Study on the Anti-hypertension mechanism of Prunella Vulgaris based on entity grammar systems

  • Du, Li;Li, Man-man;Zhang, Bai-Xia;He, Shuai-Bing;Hu, Ya-Nan;Wang, Yun
    • CELLMED
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    • v.5 no.4
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    • pp.27.1-27.6
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    • 2015
  • Literatures and experimental studies have shown that Prunella has an effect on anti-hypertension, however, its components are complicated, so that it is still difficult to clear the specific roles of its various components in blood pressure regulation in. So we decide to systematically study the anti-hypertension mechanism of Prunella. We integrated multiple databases and constructed molecular interaction network between the chemical constituents of Prunella Vulgaris and hypertension based on entity grammar systems model. The network has 262 nodes and 802 edges. Then we infer the interactions between chemical compositions and disease targets to clarify the anti-hypertension mechanism. Finally, we found Prunella could influence hypertension by regulating apoptosis, cell proliferation, blood vessel development and vasoconstriction, etc. Thus this study provides reference for drug development and compatibility, and also gives guidance for health care at a certain extent.

Study on the Synthesis Method of Simulated CRUD for Chemical Decontamination in NPPs (원전 화학제염을 위한 모의크러드 제조방법 연구)

  • Kang, Duk-Won;Kim, Jin-Kil;Kim, Kyeong-Sook
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.8 no.2
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    • pp.91-97
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    • 2010
  • As nuclear power plants are getting older, interests on a decontaminating process are increasingly attracting more attention. Chemical decontamination is crucial to lower the production of radioactive waste and radiation dose rate. Prior to this, oxidizers and detergents for target material should be chosen so as to decontaminate major systems and components of a nuclear power plant chemically. In order to decontaminate it properly, it is crucial to have information about the chemical composition and crystalline structure of CRUD, analyzing its samples from the target or the decontamination system with components. However, there is no program which enables the extraction of samples directly from the object or the decontamination system with components carrying genuine radioactivity. Therefore, it is limited to samples from corrosion products carrying partial radioactivity as a resource. The composition of CRUD varies considerably depending on refueling cycle because it is closely related to the constituent of basic material. After settling a target, it is crucial to analyze and obtain analytical information about CRUD as a decontamination target. In this paper, various technologies for manufacturing simulated CRUD are introduced as alternatives to unattained samples. A metal oxide or metal hydroxide was used to synthesize simulated cruds having chemical compositions and crystalline stricture similar to the actual one by 12 different methods. CRUD 4(metal oxides in the autoclave vessel) and CRUD 10(metal oxides in a crucible after hydrazing pretreatment)were chosen as the best method for Type 1 and Type 2.respectively. As these CRUD can be synthesized easily without using any specialized equipment or reagents in a short time and in large quantities, they are expected to stimulate the development of decontaminating agents and processes.

Fractional Extraction of DHA and EPA by Supercritical Fluid (DHA와 EPA에 대한 초임계 유체의 분할추출)

  • Hur, Byung-Ki;Noh, Duck-Woo
    • KSBB Journal
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    • v.14 no.6
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    • pp.655-660
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    • 1999
  • Supercritical fractional extraction of DHA and EPA from the mixture of fatty acids composing the fish oil was performed. The compositions, extracted quantities, and cumulative extracted quantities of fatty acids in the extract and the raffinate were investigated according to the fractional steps. The temperature and pressure for the miximum concentration of DHA and EPA in the extract or the raffinate were 60$^{\circ}C$ and 101 bar respectively among the extraction conditions considered in this study. In this case, the weight percent of EPA in the extract was 50% and that of DHA in the raffinate was 40%. These values were two times higher than those in fish oil. THe same temperature and pressure were used to extract DHA and EPA from the mixture of fatty acids whose the initial weight percent of DHA was 34%. The weight percent of DHA in the raffinate after the fourth fractionation was 7-%. And the remaining weight of DHA in the raffinate was 80% of DHA initially loaded in the extraction vessel.

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A Study on the Installation of Rupture Disk for Emergency Discharge of Dangerous Substances in Case of Styrene Monomer Runaway Reaction (스티렌모노머 폭주반응 시 위험물 비상 배출을 위한 파열판 적정 크기 선정에 관한 연구)

  • Sang Ryung Kim;Jae Min Ryu;Hyang Nam Choi;Jong Su Hyun;Hyung Sik Byun
    • Journal of the Korean Institute of Gas
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    • v.28 no.2
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    • pp.24-31
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    • 2024
  • In the chemical industry, fires and explosions constantly occur due to runaway reactions during the production of various chemical products. To prevent this, much research has been conducted, and the possibility of runaway reactions for each substance is reviewed and interlocking devices are installed to prepare for adverse reactions to prepare for fires and explosions. However, despite legal and technical safety measures, accidents due to runaway reactions still occur every year. Accordingly, in this study, based on cases of fire and explosion accidents in styrene monomer reactors, the discharge capacity during runaway reactions was examined through experiments and graphs. Unlike the commonly calculated fire equation, in the case of a runaway reaction where pressure and temperature increase rapidly, discharge is made in two phases rather than a single phase, so the size of the rupture disk must also increase, and the orientation must be adjusted before the rupture disk is installed at the top of the pressure vessel. It was found that position adjustment was necessary.