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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.
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.
API 5L X65 배관의 신뢰도 평가를 위한 파열압력 분포 추정에 관한 연구
김성준 ( Seong-jun Kim ),김도현 ( Dohyun Kim ),김철만 ( Cheolman Kim ),김우식 ( Woosik Kim ) 한국품질경영학회 2020 품질경영학회지 Vol.48 No.4
Purpose: The purpose of this paper is to present a probability distribution of the burst pressure of API 5L X65 pipes for the reliability assessment of corroded gas pipelines. Methods: Corrosion is a major cause of weakening the residual strength of the pipe. The mean residual strength on the corrosion defect can be obtained using the burst pressure code. However, in order to obtain the pipe reliability, a probability distribution of the burst pressure should be provided. This study is concerned with estimating the burst pressure distribution using Monte Carlo simulation. A response surface method is employed to represent the distribution parameter as a model of the corrosion defect size. Results: The experimental results suggest that the normal or Weibull distribution should be suitable as the probability distribution of the burst pressure. In particular, it was shown that the probability distribution parameters can be well predicted by using the depth and length of the corrosion defect. Conclusion: Given a corrosion defect on the pipe, its corresponding burst pressure distribution can be provided at instant. Subsequently, a reliability assessment of the pipe is conducted as well.