• 한국가스학회지
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• 제18권3호
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• pp.13-19
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• 2014

이산화탄소 포집 및 저장 시스템(CCS, Carbon dioxide Capture and Storage system)의 수송배관에 대한 연속연성파괴(DDF, Dynamic Ductile Fracture)를 연구하기 위하여 Battlle Two Curve법(BTCM)으로 CCS수송배관의 연속연성파괴거동을 해석하여 천연가스 수송배관의 연속연성파괴거동과 비교하였다. 또한, $CO_2$배관에서의 배관두께 및 사용온도에 따른 연속연성파괴 민감도를 분석함으로써 연속연성파괴에 대한 사용기준을 해석하였다. 우리나라 기후조건에 따른 $CO_2$배관두께와 수송압력 사용기준을 분석하였으며, 상온의 경우에는 기존의 천연가스용 배관을 $CO_2$배관으로 사용하기 위해서는 배관두께가 7mm이상이어야 하고 수송압력은 54bar이하이어야 함을 해석하였다.

• 한국가스학회지
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• 제19권5호
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• pp.104-111
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• 2015

극한지 천연가스 수송배관망의 기술개발은 동토지역의 특수성을 고려해야 하는 매우 흥미롭고 도전적인 분야로서 본 연구는 수송배관의 핵심기술을 파악하기 위하여 극한지 애로기술에 대한 문헌조사와 주요 영향인자를 파악하였다. 특히, 열유동 고려사항에 대한 문헌조사를 통하여 극한지 천연가스 수송배관망 유동확보기술을 개발하기 위한 이론적 접근 주제를 정할 수 있었고, 또한 이론 해석을 통한 기본적인 결과를 도출할 수 있었다.

• 한국가스학회지
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• 제17권2호
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• pp.44-49
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• 2013

천연가스의 사용량이 날로 증가됨에 따라 고용량의 가스를 운송하기 위해 고압배관의 설치 운영이 불가피하고 이에 따라 고압의 매몰 천연가스배관에서 다양한 원인에 의한 결함 발생 시 대규모 누출로 이어지면 높은 압력의 가스 방출에 따른 대기 중 확산 그리고 점화원에 의한 화재 폭발로 인하여 큰 피해가 발생할 수 있다. 이 연구에서는 고압의 매몰 천연가스배관에서 결함 발생 시 매몰된 배관에서의 가스 누출 거동 분석과 가스 확산 및 지연점화에 따른 플래시 화재의 피해 거리를 예측하여, 사고 영향을 감소할 수 있도록 대피거리의 산정 등에 의한 비상조치계획을 세워 안전관리 활동에 도움이 되고자 한다.

• 한국수소및신에너지학회논문집
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• 제27권2호
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• pp.230-235
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• 2016

The purpose of this study is to evaluate the gas leakage for a 30-inch ball valve. The ball valve was designed and manufactured for a natural gas transportation through a long-distance pipeline mainly installed in the permafrost region. The gas leakage assessment is based on the pressure testing criteria of international standards. Pressure conditions of the gas leakage test was employed 70 bar, 100 bar, and 110 bar. The amount of the gas leakage at each pressure condition was small and had a value under the pressure testing criteria, ISO 5208. Gas leakage with respect to the test pressure was predicted by the polynomial curve fitting using the experimental results. It is found that the gas leakage rate according to the pressure is proportion to a second order curve.

• 한국가스학회지
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• 제1권1호
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• pp.14-20
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• 1997

배관망의 해석은 유체역학을 필요로 하며 관내의 유체의 거동과 운전상태에 따른 유동 해석을 위해 여러 식들이 사용되어왔다. 본 연구에서는 정상상태의 유량방정식을 사용해 경인지역가스 배관망에 대한 수학적 모델을 만들고 모사 및 분석을 수행하였다. 개발된 수학적 모델에서 얻어진 데이터에 통계학적인 방법을 도입해 통계학적 모델을 만듦으로써 통계학적 모델을 이용한 배관망 해석의 가능성에 대해 검토하였다.

• 한국안전학회지
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• 제21권2호
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• pp.1-6
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• 2006

It is well known that pipelines have the highest capacity and are the safest and least environmentally disruptive form of transporting oil and gas. However, pipeline damage caused by both internal and external corrosion is a major concern threatening the reliability of oil and gas transportation and the soundness of the pipeline structure. In this study, we estimate the allowable damage by comparing the ASTM B31G code to a modified theory considering diverse detailed corrosive forms. The ASTM B31 G code has been developed as the evaluation method for reliability and incident prevention of damaged pipelines based on the amount of loss due to corrosion and the yield strength of materials. Furthermore, we suggest a method for estimating the expected life span of used pipelines by utilizing the reliability method based on major variables such as the depth and length of damage and the corrosion rate affecting the life expectancy of the pipelines.

• Earthquakes and Structures
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• 제12권3호
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• pp.321-332
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• 2017

The reverse fault is a dangerous geological hazard faced by buried steel pipelines. Permanent ground deformation along the fault trace will induce large compressive strain leading to buckling failure of the pipe. A hybrid pipe-shell element based numerical model programed by INP code supported by ABAQUS solver was proposed in this study to explore the strain performance of buried X80 steel pipeline under reverse fault displacement. Accuracy of the numerical model was validated by previous full scale experimental results. Based on this model, parametric analysis was conducted to study the effects of four main kinds of parameters, e.g., pipe parameters, fault parameters, load parameter and soil property parameters, on the strain demand. Based on 2340 peak strain results of various combinations of design parameters, a semi-empirical model for strain demand prediction of X80 pipeline at reverse fault crossings was proposed. In general, reverse faults encountered by pipelines are involved in 3D oblique reverse faults, which can be considered as a combination of reverse fault and strike-slip fault. So a compressive strain demand estimation procedure for X80 pipeline crossing oblique-reverse faults was proposed by combining the presented semi-empirical model and the previous one for compression strike-slip fault (Liu 2016). Accuracy and efficiency of this proposed method was validated by fifteen design cases faced by the Second West to East Gas pipeline. The proposed method can be directly applied to the strain based design of X80 steel pipeline crossing oblique-reverse faults, with much higher efficiency than common numerical models.

• 한국수소및신에너지학회논문집
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• 제26권5호
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• pp.463-468
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• 2015

This study describes the effect of upstream curved pipe on internal flow characteristics ball valve. Continuity and three-dimensional Reynolds-averaged Navier-Stokes equation have been used as governing equations for the numerical analysis. The upstream curved pipe - ball valve model was assumed that it is used for Alaska pipeline project which was planned to provide reliable transportation of natural gas from ANS to Alaska-Yukon border. Therefore the characteristics of pipe and operating condition of pipeline were from report of Alaska pipeline project. The three curvature and three location of upstream curved pipe were analyzed. The results shows that there are typical flow patterns at ball valve and the upstream curved pipe makes some differences to the internal flow of ball valve.

• Advances in Energy Research
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• 제2권2호
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• pp.61-72
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• 2014

This paper's aim is to do a global evaluation (considering four dimensions: technical-economic, environmental, social and political) in the ways of natural gas transportation (gas pipelines, GNL and GTL) and electric transmission, in order to supply the energy demands of Mato Grosso do Sul, a brazilian state. The transport ways had been compared between itself using a software of decision taking (Decision Lens Suite), which determined a better way for transporting natural gas in this case. In a generalized manner the gas pipeline is the best way of transporting natural gas, therefore it takes advantage in the majority of the analyzed dimensions.

• 한국산업융합학회 논문집
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• 제8권4호
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• pp.197-204
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• 2005

It is well known that pipelines have the highest capacity and are the safest and least environmentally disruptive form of transporting oil and gas. However, pipeline damages caused by both internal and external corrosion is a major concern threatening the reliability of oil and gas transportation and the soundness of pipeline structure. In this study, we estimated the expected allowable damage defect by comparing the ASTM B31G code which has been developed as the evaluation method of reliability and incident prevention of damaged pipelines based on the amount of loss due to corrosion and the yield strength of materials to a modified theory considering diverse detailed corrosional forms. Furthermore, we suggested the method that estimates the expected life span of used pipelines by utilizing the reliability method based on major variables such as, the depth and length of damage and corrosional rate affecting the life expectancy of pipelines.