• 제목/요약/키워드: buried pipeline

검색결과 219건 처리시간 0.029초

외면부식 직접평가법 개발 및 국내 도입 연구 (The Development and Introduction of External Corrosion Direct Assessment Measures for Urban Gas Pipelines)

  • 류영돈;이진한;윤영기;임호석
    • 한국가스학회지
    • /
    • 제18권5호
    • /
    • pp.12-19
    • /
    • 2014
  • 매설배관의 부식위험성을 최소화하고 음극방식의 효율극대화를 위해 다양한 비굴착 간접검사기법들이 수십년 전부터 이용되고 있으며, 미국에서는 굴착을 통한 매설배관 외면부식 직접평가법을 CFR 코드에서 규정하고 있다. 국내의 경우에는 도시가스사업법 관련 4개의 기준(KGS Code)에서 배관의 손상여부를 측정할 수 있는 장비를 이용하여 배관의 상태를 점검, 측정하고 이상부위에 대하여 누출검사를 한 경우 매설배관의 기밀시험을 한 것으로 보고 있을 뿐 배관외면부식 직접평가에 대한 규정은 없다. 본 논문에서는 미국, 영국 등 국외의 매설배관 건전성 관리 기준 및 방법을 조사하고, 국내의 매설배관 방식관리 실태 및 피복손상탐지 장치 이용실태 등을 조사한 후 국내 실정에 맞는 매설배관 외면부식 직접평가법을 제시하였다. 본 논문에서 제시한 매설배관 외면부식 직접 평가법은 국내에서 중압배관의 정밀안전진단 제도를 도입하는데 기초 자료로 활용되었다.

가스배관과 철탑접지의 이격거리 관련 기준 (Standards of Distance between Gas Pipeline and Tower Ground)

  • 이현구;하태현;하윤철;배정효;김대경
    • 한국가스학회지
    • /
    • 제11권1호
    • /
    • pp.18-22
    • /
    • 2007
  • 전력선에 지락고장이 발생할 경우 대지로 유입된 고장전류에 의하여 인접한 배관에 아크 용융이 발생하면 가스폭발이나 기름유출과 같은 대형사고를 발생시킬 수 있으며, 배관의 유지 및 보수를 담당하는 작업자의 안전에도 위험을 초래할 수 있다. 본 논문에서는 대지를 통한 철탑과 배관 사이의 아크 발생에 대하여 알아보고, 국내외에서 사용되고 있는 철탑 인근에 매설된 배관의 이격거리 기준을 조사하였다.

  • PDF

Experimental Study of Load Characteristics of Buried and Exposed Large-Diameter Pipelines Using Fiber-Optic Strain Sensor

  • Chung, Joseph Chul;Lee, Michael Myung-Sub;Kang, Sung Ho
    • 한국해양공학회지
    • /
    • 제34권3호
    • /
    • pp.194-201
    • /
    • 2020
  • In this study, an optical-fiber sensor was used to measure loads that could act in an environment similar to the loading conditions that exist in an actual pipe. The structure and the installation method of the optical-fiber strain sensor were applied considering the actual large pipe and the buried pipe environment. Load tests were performed using a displacement sensor and sandbags to determine the deflection of the pipe according to the external load, and the linear measurement results were verified. Considering the conditions that could exist in the actual pipe, the test method was presented, and the strain of the buried pipe generated at this time was measured.

Simplified modelling of continous buried pipelines subject to earthquake fault rupture

  • Paolucci, Roberto;Griffini, Stefano;Mariani, Stefano
    • Earthquakes and Structures
    • /
    • 제1권3호
    • /
    • pp.253-267
    • /
    • 2010
  • A novel simple approach is presented for the seismic analysis of continuous buried pipelines subject to fault ruptures. The method is based on the minimization of the total dissipated energy during faulting, taking into account the basic factors that affect the problem, namely: a) the pipe yielding under axial and bending load, through the formation of plastic hinges and axial slip; b) the longitudinal friction across the pipe-soil interface; c) the lateral resistance of soil. The advantages and drawbacks of the proposed method are highlighted through a comparison with previous approaches, as well as with finite element calculations accounting for the 3D kinematics of the pipe-soil-fault systems under large deformations. Parametric analyses are also provided to assess the relative influence of the various parameters affecting the problem.

천연가스 공급배관의 사용적합성 통합프로그램 (Integrated Fitness-for-service Program for Natural Gas Transmission Pipeline)

  • 김우식;김영표;김철만;백종현
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2008년도 추계학술대회A
    • /
    • pp.269-274
    • /
    • 2008
  • 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.

  • PDF

가스배관과 철탑접지의 이격거리 관련 기준 (Standards of Distance between Gas Pipeline and Tower Ground)

  • 이현구;하태현;하윤철;배정효;김대경
    • 한국가스학회:학술대회논문집
    • /
    • 한국가스학회 2006년도 추계학술발표회 논문집
    • /
    • pp.191-195
    • /
    • 2006
  • 전력선에 지락고장이 발생할 경우 대지로 유입된 고장전류에 의하여 인접한 배관에 아크 용융이 발생하면 가스폭발이나 기름유출과 같은 대형사고를 발생시킬 수 있으며, 배관의 유지 및 보수를 담당하는 작업자의 안전에도 위험을 초래할 수 있다. 본 논문에서는 대지를 통한 철탑과 배관 사이의 아크 발생에 대하여 알아보고, 국내외에서 사용되고 있는 철탑 인근에 매설된 배관의 이격거리 기준을 조사하였다.

  • PDF

가스 배관의 차단 주파수에 따른 음파전달특성 연구 (Acoustic Wave Propagation Characteristics Corresponding to the Cut-off Frequency in Gas Pipeline)

  • 김민수;이상권;장상엽;고재필
    • 한국소음진동공학회논문집
    • /
    • 제18권7호
    • /
    • pp.693-700
    • /
    • 2008
  • High-Pressure gas Pipeline which is buried in underground has the Possibility that will be exposed to unexpected dangerous impact of construction equipment. To protect from this kind of danger, the real-time health monitoring system of the high-pressure gas pipeline is necessary. First of all, to make the real-time health monitoring system clearly, the acoustic wave propagation characteristics which are made from various construction equipment impacts must be identified. In link of technical development that prevents the damage of high-pressure gas pipeline, this paper gives FEM(finite element method) and BEM(boundary element method) solutions to identify the acoustic wave propagation characteristic of the various impact input signals which consist of Direc delta function and convolution signal of 45 Hz square signal and random signal.