Research for KGS FS551 Amendment Using Abroad Code and Structure Simulation

Byung-Ik Kang(강병익),Byung-Gi Kim(김병기),Byung-Duk Kim(김병덕) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.9

According to KGS FS551, the safety of an exposure pipe system should be calculated quantitatively by calculating the stress of exposed piping for thermal expansion. However, many pipe system designs and installation sites are not equipped for this. Therefore, KGS FS551 suggested the use of safe gas by presenting the recommended pipe shape. The shapes of various pipe systems have been derived. However, the recommended shape could not be an absolute evaluation standard. Furthermore, the ongoing debate over standards between a plumbing installer and an inspector is an obstacle to the efficient and safe use of gas. Therefore, the correct pipe system evaluation method is examined in this study, and the safety of the existing exposed pipe system is verified.

루츠형 중진공펌프 국산화 개발

탁봉열,김병덕,양해경,한기영,이소아,Tak, Bong-Yeol,Kim, Byung-Duk,Yang, Hea-Gyeong,Han, Gi-Young,Lee, So-A 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.19 No.3

Due to a roots type medium vacuum pump is operated in condition of $1{\sim}10^{-3}$ torr vacuum, it could be applied for production and process of industrial parts, such as precise processing, vaporization, enrichment, separation, casting, metaling, welding, transportation. Therefore, the demand of this pump is increasing nowadays in our industrial markets of semiconductor, electric, electronic, automobile, material, environmental and transporting industries. However, the pumps are almost imported, because the domestic pumps are inferior in fields of vacuum range as under $10^{-1}$torr, relevant techniques(design, fabrication, casting, test, etc.) to the imported ones. In this study, essential parts of the development pump are designed with using of CFD and 3D decodes, FEM for analysing strength and deformation, generated heat, vibration and noise control, and are casted with using of mechanochemistry techniques for decreasing of weights, increasing of heat resistances and abrasion durability of materials for pump caing and impellers especially. Besides, in order to achieve ultimate vacuum around $10^{-3}$torr, this pump is composed of 6 stages, among which 1st stage is operated separately from remained stages. Additionally, a test rig for prototype pumps(300$m^3/h$ and 2,500$m^3/h$) is designed and procured as to apply for multi-staged rootz type vacuum pump, with modification of the test method recommended by KS B 6314 "Positive-displacement oil-sealed rotary vacuum pumps".

루츠형 중진공펌프 국산화 개발

탁봉열(Bong-Yeol Tak),김병덕(Byung-duk Kim),양해결(Hea-Gyeong Yang),한기영(Gi-Young Han) 한국유체기계학회 2010 유체기계 연구개발 발표회 논문집 Vol.2010 No.12

Due to a roots type medium vacuum pump is operated in condition of 1~10?³ torr vacuum, it could be applied for production and process of industrial parts, such as precise processing, vaporization, enrichment, separation, casting, metaling, welding, transportation. Therefore, the demand of this pump is increasing nowadays in our industrial markets of semiconductor, electric, electronic, automobile, material, environmental and transporting industries. However, the pumps arc almost imported, because the domestic pumps arc inferior in fields of vacuum range as under 10?¹torr, relevant techniques(design, fabrication, casting, test, etc.) to the imported ones. In this study, essential parts of the development pump arc designed with using of CFD and 3D decodes, FEM for analysing strength and deformation, generated heat, vibration and noise control, and arc casted with using of mechanochemistry techniques for decreasing of weights, increasing of heat resistances and abrasion durability of materials for pump caing and impellers especially. Besides, in order to achieve ultimate vacuum around 10?³torr, this pump is composed of 6 stages, among which tsr stage is operated separately from remained stages. Additionally, a test rig for prototype pumps(300㎥/h and 2,500㎥/h) is designed and procured as to apply for multi-staged rootz type vacuum pump, with modification of the test method recommended by KS B 6314 "Positive-displacement oil-sealed rotary vacuum pumps".

AOV Actuator의 진단시험기술 개발

정경열(Kyung-Yul Chung),김병덕(Byung-Duk Kim),류석현(Suk-Hyun Ryu),오상훈(Sang-Hoon Oh) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-

This paper was written to develop diagnosis technique and a data acquisition method of an AOV actuator performance for a purpose to solve a problem of AOVs and accessories in the domestic power plants. as a result, we confirmed that an AOV actuator was correctly designed and executed, and performed calibration of an AOV actuator with signature analysis.

원자력플랜트 배수관용 PE배관 열융착부 결함크기에 따른 유한요소 해석

길성희(Seong Hee Kil),김병덕(Byung Duk Kim),권정락(Jeong Rock Kwon),윤기봉(Kee Bong Yoon) 한국가스학회 2013 한국가스학회 학술대회논문집 Vol.2013 No.11

국내 대학 실험실 독성가스 시설의 안전관리를 위한 표준 체크리스트 개발

이성진(Sungjin Lee),김병덕(Byung-Duk Kim),하동명(Dong-Myeong Ha) 한국가스학회 2015 한국가스학회지 Vol.19 No.6

독성가스는 고압가스안전관리법에 의해 관리된다. 독성가스는 “고압가스안전관리법에서 규정한, 31종의 가스와 LC<SUB>50</SUB>이 5000 ppm 이하인 가스”이다. 전자산업의 발달에 따라 우리나라 독성가스 사용량은 폭발적으로 증가하였다. 이에 국내 대학교 실험실의 독성가스 관련 연구 수요도 함께 증가해 왔다. 그러나 국내 실험실 독성가스 안전관리와 관련한 연구는 전무한 상태이다. 본 연구에서는 국내 대학 실험실의 실태조사를 통해 독성가스 안전관리에 있어서의 약점들을 파악하였다. 이 같은 약점을 극복하기 위해 독성가스 안전관리 방안을 제시하였다. 또한 제시된 방안에 따라 독성가스 시설이 안전하게 관리되는지를 확인하고, 이를 통한 개선을 위해 표준 체크리스트를 개발하였다. 이 연구 결과는 국내 대학 실험실에서 독성가스 시설의 안전관리를 강화할 것이며, 이를 모든 실험실에 대한 안전 지침으로 제공한다. Toxic gases are managed by High Pressure Gas Safety Control Act. Toxic Gases are “31 designated species and each gas of which the permissible concentration(LC<SUB>50</SUB>) is equal to or less than 5000 ppm as defined in High Pressure Gas Safety Control Act.”. Korean toxic gas usage in accordance with the growth of the electronic industry has increased explosively. The demand of toxic gas research in domestic university laboratories has grown together. But the research associated with toxic gas safety management in the domestic laboratory is nonexistent state. In this study, we identified weak points of toxic gas safety management through a survey of domestic university laboratory facilities. This paper presented toxic gas safety measures in order to overcome those weak points. Also this paper developed a standard checklist to improve and ensure safe management of toxic gas facility in accordance with the proposed measures. This research is to enforce safety management of toxic gas facilities in domestic university laboratory and it will provide safety guidelines for every laboratory.

지반 침하를 고려한 도시가스 입상배관의 응력평가

길성희(Seong-Hee Kil),김병덕(Byung-Duk Kim),권정락(Jeong-Rock Kwon),윤기봉(Kee-Bong Yoon) 한국가스학회 2013 한국가스학회지 Vol.17 No.2

본 연구에서는 공동주택의 외벽에 설치되어 있는 도시가스 입상배관이 지반 침하에 의해 손상된 사례를 약 120여건 조사하였다. 조사결과 약 100mm~200mm 지반 침하가 발생한 것으로 확인되었으며 지반 침하로 인하여 배관이 절단되어 가스가 누출될 정도로 배관이 손상된 사례도 있었는데 이때 절단된 배관 사이의 간격이 약 50mm 이상 되었다. 지반 침하에 의한 배관의 침하량을 측정하기 위한 장치를 설계 및 제작하여 실제 공동주택에 설치한 후 약 5개월 동안 배관의 침하량을 측정한 결과 약 1.3mm 정도 배관이 침하되었음을 확인하였다. 현장 측정 결과를 토대로 현장 상황을 모사한 이론적 배관응력평가를 실시하였다. 그리고 지반 침하가 발생한 경우 가스 입상 배관 전단부에 설치 가능한 신축흡수방법을 검토하고 신축흡수방법을 설치한 경우를 고려하여 가스 입상 배관의 안전성을 평가하였다. In this study, 120 cases of damage due to ground subsidence of city gas pipeline which is hanging on apartment outer wall were investigated. From the survey results, it was determined to be approximately 100m~200mm ground subsidence occurred and at severe damage, pipeline was cut and the gap was about 50mm between two cut pipeline. Device for measuring the amount of deformation of standing gas pipeline was designed and fabricated. And installed it on apartment outer wall for measuring the deformation due to ground subsidence, after 5 months measurement the amount of ground subsidence was measured to 1.3mm. Stress assessment was conducted based on results of ground subsidence occurred on standing gas pipeline.

Non-Destructive Testing of Damaged Thermoplastic Pipes Electrofusion Joints Using Phased Array Ultrasonic

Seong-Hee Kil(길성희),Byung-Duk Kim(김병덕),Jeong-Rock Kwon(권정락),Kee-Bong Yoon(윤기봉) 한국가스학회 2013 한국가스학회지 Vol.17 No.5

열가소성 플라스틱배관의 전기융착부에 대한 비파괴검사방법은 융착부의 안전성을 확보하고 장기적인 신뢰성을 확보하기 위한 방법이다. 정상적인 방법에 의하여 융착된 접합부에서도 배관의 진원도와 전기융착 소켓과의 진원도 차이 또는 기공 등에 의해 융착부에 결함이 발생할 수 있다. 본 연구에서는 위상배열초음파를 이용하여 손상된 폴리에틸렌 전기융착부의 검사를 수행하였다. 검사 대상인 250mm 직경의 폴리에틸렌 배관 전기융착부는 1994년 12월에 융착되었으며 실제 작동 압력은 2.45kPa이다. 2004년 2월 소켓 이음부 근처에서 가스가 누설되어 수거되었다. 손상된 전기융착부에 대하여 첫 번째로 육안검사를 실시하고 다음에 위상배열초음파를 이용한 비파괴검사를 실시하였다. 그리고 절단 검사를 실시하여 각각의 검사 결과와 비교하였으며 위상배열 초음파를 이용한 검사결과와 절단 검사 결과가 동일함을 확인하였다. Non destructive testing(NDT) methods of electrofusion(EF) joints of thermoplastics pipes are required for fusion joint safety and for the long term reliability of a pipe system. Electrofusion joints, which are joined at the proper fusion process and procedures, may encounter defects due to the difference of ovality between pipes and coupling, improper fusion process or porosity result from electrofusion joining. These defects can cause the failure of pipeline and by extension, they can be caused the limit to expand the use of plastics pipes. This paper studies inspection results using ultrasonic imaging method for damaged polyethylene electrofusion joints. Gas was leaking from 250mm diameter polyethylene electrofusion joints at February 2004 which was electrofused at December 1994 and operation pressure was 2.45kPa. First, surface inspection was conducted and then in order to find the types of defects examination using ultrasonic imaging method was performed. Lack of fusion and inappropriate inserting for polyethylene pipes into electrofusion coupling were found and causes of the gas leak were judged that misalignment and insert defect. Cutting inspection was performed and each inspection results were compared to. Results of ultrasonic imaging method and cutting inspection were the same.

루츠형 중진공펌프 국산화 개발

탁봉열(Bong-Yeol Tak),김병덕(Byung-duk Kim),양해경(Hea-Gyeong Yang),한기영(Gi-Young Han),이소아(So-A Lee) 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.14 No.3

위험도 기반 검사(RBI; Risk-Based Inpection)기법을 이용한 석유 · 가스 산업의 환경 정화 비용 평가 연구

김신영(Shin-young Kim),최송천(Song-Chun Choi),김병덕(Byung-Duk Kim) 한국가스학회 2013 한국가스학회 학술대회논문집 Vol.2013 No.5