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Integrated Fitness-far-service Program for Natural Gas Transmission Pipeline
Woosik Kim(김우식),Youngpyo Kim(김영표),Cheolman Kim(김철만),Jonghyun Baek(백종현) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
For fitness-for-service analyses of underground natural gas pipelines, engineering assessment methods against possible defects need to be developed. The assessment methods for high pressure pipeline of KOGAS, was developed using the full size pipe burst tests and the finite element analysis. It included the defect assessment methods for a single and multi -corrosion, corrosion in girth welding part, corrosion in seam welding part, the mechanical damage defects as dent and gouge, crack and large plastic deformation of API 5L X65 pipe. In addition, we developed method to assess pipeline integrity by internal and external load to buried pipeline. Evaluation results were compared with other methods currently being applied to the gas pipeline. The program of Windows environment is made for easily using assessment methods. It provides a consistent user interface, so non-professional technician can easily and friendly use the FFS program from company intranet. Several evaluation programs is easily installed using one installer. Each program constitutes a common input interface and the output configuration program, and evaluation result store and can be recalled at any time. The FFS program based on independent evaluation method is used to evaluate the integrity and safety of KOGAS pipeline, and greatly contribute to safe and efficient operation of pipeline. This paper presents experimental, analytical and numerical investigations to develop the FFS methods for KOGAS pipeline, used as high pressure natural gas transmission pipeline within KOREA. Also, it includes the description of the integrated program for FFS methods.
김우식(Woosik Kim),김영표(Youngpyo Kim),백종현(Jonghyun Baek),김윤재(Yunjae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In case of route change of a small angle in construction of natural gas pipeline, cold bend pipe made in field is used. Hot bend pipe made in shop is used in pipeline route change more than 16o angle. A study on hot bend pipe is still a little. The thickness of hot bend pipe is not uniform, and the bending process changes material properties. The integrity assessment for hot bend pipe has not been presented yet, and the evaluation method of straight pipe is not clear whether or not applicable. In this paper, the integrity assessment method for corrosion defect in hot bend pipe of natural gas transmission pipeline is proposed.
김영표(Youngpyo Kim),김철만(Cheolman Kim),백종현(Jonghyun Baek),김우식(Woosik Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Among the damage that can occur gas pipeline leading to corrosion and mechanical defect by external load as like gouge and dent. Gouge, dent and gouge/dent caused by external load reduce the burst pressure of gas pipeline due to thickness reducing, changes in material properties and stress concentration. Pipeline companies should establish for fitness-for-service assessment method for pipeline defect and need company criteria for pipeline integrity assessment. In this study, we tested the burst pressure of gouge pipe using the full scale pipe burst test facility, and predicted the burst pressure of gouge pipe with various forms using computer finite element method. We developed the optimal engineering limit load equation and established the FFS assessment method of gouge pipe for pipeline operation and maintenance with safety and efficiency.
박종현(JongHyun Park),백종현(JongHyun Paik),김문구(MoonKoo Kim) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.6
시장성장이 정체된 방송통신 시장의 회복과 투자의 동인으로 작용하고 있으며 모바일 융합은 산업간, 서비스간 영역의 해체, 새로운 가치사슬의 형성 등 으로 새로운 수익창출의 기회를 제공한다. 그리고 모바일 융합은 관련 산업과 서비스의 선 순환적 연결고리 역할을 수행하게 된다. 이에 본 글에서는 컨버전스 서비서의 대표적인 서비스로 모바일 융합서비스의 개념 및 특징, 시장조사를 통한 고객 수용도 분석을 바탕으로 모바일 융합서비스의 경쟁력 강화방향을 제시하고자 한다.