• Title/Summary/Keyword: Gas Leakage

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Assessment of Gas Leakage for a 30-inch Ball Valve used for a Gas Pipeline (가스 파이프라인용 30인치 볼 밸브의 누설량 평가)

  • KIM, CHUL-KYU;LEE, SANG-MOON;JANG, CHOON-MAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.2
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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.

A Study on the Analysis of the Leakage Characteristics and the Selection of Leakage Scenarios of the Blending Hydrogen into Natural Gas Pipeline (수소혼입 천연가스 배관망의 누출 특성 분석 및 누출 시나리오 선정에 관한 연구)

  • Song Su Tak;Ki Seop Lim
    • Journal of the Korean Society of Safety
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    • v.39 no.1
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    • pp.27-32
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    • 2024
  • This study analyzed cases of hydrogen (H2) and natural gas (CH4) leakage from a hydrogen-blended natural gas pipeline to determine a range of leakage characteristics, including leakage type, pipe material, pipe diameter, pressure, and damage size. Based on the results of this analysis, five hydrogen-blended natural gas leakage scenarios were selected. The national vision for a carbon-neutral society by 2050 is a very important strategic objective and promotes environmentally sustainable economic development in the age of the climate crisis. Accordingly, zero-carbon and low-carbon policies are being promoted in various fields, including energy production, consumption, and industrial processes. Hydrogen-blended natural gas is eco-friendly and is considered an important step towards carbon neutrality, with various countries including the United States and several European countries conducting empirical research to further investigate its potential. In Korea, a national research project commenced in April 2023 to verify and demonstrate the life cycle safety of blending hydrogen into the natural gas network. The results of this study will provide important data for the analysis of the damage impacts caused by the leakage of hydrogen-blended natural gas, such as the diffusion of gas clouds, fires, and gas explosions.

Diffusion Range and Pool Formation in the Leakage of Liquid Hydrogen Storage Tank Using CFD Tools

  • Kim, Soohyeon;Lee, Minkyung;Kim, Junghwan;Lee, Jaehun
    • Applied Chemistry for Engineering
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    • v.33 no.6
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    • pp.653-660
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    • 2022
  • In liquid hydrogen storage tanks, tank damage or leakage in the surrounding pipes possess a major risk. Since these tanks store huge amounts of the fluid among all the liquid hydrogen process facilities, there is a high risk of leakage-related accidents. Therefore, in this study, we conducted a risk assessment of liquid hydrogen leakage for a grid-type liquid hydrogen storage tank (lattice-type pressure vessel (LPV): 18 m3) that overcame the low space efficiency of the existing pressure vessel shape. Through a commercially developed three-dimensional computational fluid dynamics program, the geometry of the site, where the liquid hydrogen storage tank will be installed, was obtained and simulations of the leakage scenarios for each situation were performed. From the computational flow analysis results, the pool formation behavior in the event of liquid hydrogen leakage was identified, and the resulting damage range was predicted.

A Study on Characteristics of Hydrogen Leakage in Hydrogen Town Governor Room (수소타운 정압기실 내 수소 누출 특성 연구)

  • NAM, TAE-HO;KIM, DONG-HWAN;LEE, JUNG-WOON;LEE, SEUNG-KUK;LEE, YEON-JAE
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.6
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    • pp.685-692
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    • 2016
  • Hydrogen will be a future eco-friendly energy source that can replace current fossil fuels However when hydrogen gas leaks and people inhale a lot of hydrogen gases, they can have fatal effects fell into comas. Therefore, we need to develop a safety technology and related guidelines for reducing risks of hydrogen leakage. In this regard, we carried out demonstration tests assuming a situation of hydrogen leakage. Before the experiments, we analyze the standards for governor facilities to check vent positions and sensor positions. Then, we select four types of ventilation structures and proceeds with the experiments of hydrogen leakage at 1 LPM and 1.5 LPM. Based on the experimental results, we propose the direction on optimization of vent positions and sensor positions in the hydrogen leakage situation.

A Study on the Gas Leakage and Friction of the Self-lubricating Piston Seal Rings (자체 윤활 피스톤 씨일 링의 가스 누출과 마찰에 대한 연구)

  • 심현해;권오관;이규한;김병환;임윤철
    • Tribology and Lubricants
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    • v.12 no.4
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    • pp.7-12
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    • 1996
  • Present study was undertaken to investigate the leakage and friction of self-lubricating piston seal rings. A crank-piston type gas leakage test set-up was constructed. The piston rings were made of PTFE-polyimide composite. The free gap configurations of the seal rings were butt and step types. Eccentric tension rings were used to give the seal rings prepressure between the seal rings and cylinder wall. Two sizes of the tension rings were installed to investigate their effect on the gas leakage and friction of the seal rings. The results showed that step type seal rings are superior than the butt types. High tension spring rings resulted in low leakage and high friction loss. In order to reduce the gas leakage and friction loss of the piston seal rings, there should be compromise between the number of ring stages and prepressure of the tension rings.

A Study on the Improvement of Leak Alarm Reliability of Gas Meter for Leak Inspection according to Boiler Usage Pattern (보일러 사용 패턴에 따른 누출점검용 가스계량기 누출 알람 신뢰도 개선 연구)

  • Jin-Du Yang;Seung-Won Lee;Eun-Il Choi;Sung-Hyeon Lim
    • Journal of the Korean Institute of Gas
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    • v.27 no.3
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    • pp.72-76
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    • 2023
  • Among urban gas-using facilities, more and more cases are using gas meters for leakage inspection instead of inspection ports for concealment pipes. Leak alarm alarms were continuously generated according to the boiler's special usage pattern in an environment where there was no actual gas leakage among some households where this meter was installed. It does not perform its original function of detecting actual gas leakage. Based on these problems, this study analyzed the conditions under which the gas meter for leakage inspection generates leakage alarms according to the boiler's special gas use pattern, and sought a set value that can generate an alarm only in the case of actual gas leakage. Through this, it is intended to relieve citizens' anxiety about gas use due to malfunction of the alarm and at the same time perform the original function of the meter that can detect leaking gas.

A Phenomenological Review on the Damage of Hot Gas Parts caused by Explosion of Gas Turbine Cooling System (가스터빈 내부 냉각계통 발화에 의한 고온부품 손상의 현상학적 고찰)

  • Yu, Won-Ju;Lee, Seong-Hyun
    • Journal of the Korea Safety Management & Science
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    • v.12 no.2
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    • pp.75-82
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    • 2010
  • Gas turbines for power generating operate in a very high temperature condition and use natural gas for fuel. For this reason, many cases of damage happen at hot gas parts which are severely affected by high temperature gas and many cases of explosion occur by fuel gas. So a lot of efforts should be made to prevent hot gas parts damage and gas explosion accidents. Though there are many damage cases and explosion accidents, it is very difficult to find out the root causes of hot gas parts damage caused by gas explosion due to gas leakage in the heat exchanger for air cooling and gas heating. To prevent gas turbine from damage caused by gas explosion, removal of leakage gas from gas turbine is inevitably required before firing the gas turbine and installing alarm systems is also required for detecting gas leakage at stop valve to turbine while shut down.

A Phenomenological Review on the Damage of Hot Gas Parts caused by Explosion of Gas Turbine Cooling System (가스터빈 내부 냉각계통 발화에 의한 고온부품 손상의 현상학적 고찰)

  • Yu, Won-Ju;Lee, Seong-Hyun
    • Proceedings of the Safety Management and Science Conference
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    • 2010.04a
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    • pp.81-95
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    • 2010
  • Gas turbines generating power operate in high temperature condition and use natural gas as fuel. For that reason, there are many cases where damage is done to the hot gas parts caused by the high temperature and many accidents occur like gas explosions, then various efforts are needed to maintain the hot gas parts and prevent accidents. It is difficult to find the root causes of damage to the hot gas parts from the gas explosion caused by gas leakage through rotor cooling air line from fuel gas heat exchanger during the shut down. To prevent gas turbine from damage, removal of gas leakage inside of gas turbine is required by purging the turbine before firing, improving the fuel gas heating system and installing alarm systems for detecting gas leakage from stop valve to turbine while the gas turbine has shut down.

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Experimental Study on the Safety of a Valve for a Special Gas Cylinder (특수가스용기용 밸브의 안전성에 관한 실험적 연구)

  • Kim, Chung Kyun
    • Journal of the Korean Institute of Gas
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    • v.17 no.3
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    • pp.14-19
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    • 2013
  • This paper presents an experimental study on the safety of a valve for a special gas cylinder. The test valves that were randomly dismantled from the special gas cylinder were experimented on the gas leakage and operation safeties. The crack, wear and deformation of the valve body, screw thread, safety disk, vent hole, stem and handle components that may affect to the gas leakage safety of a used valve were not found in this experimental study. A painted handle of a valve was partly stripped from the coated surface, and the surface of PT screw of a used valve body was rusted. But, these paint and rust problems do not affected to the gas leakage safety of used valves. And there was no gas leakage in the dismantled valve, and the permanent deformation and partial scars of a valve stem and O-rings were observed on the rubbing surfaces. Thus, the valve seat and O-rings are recommended to be replaced for a gas leakage safety of a dismantled valve. And it is necessary to repair and inspect handle fastening forces for a safe opening and closing operations of a valve.

Nondestructive Testing of Welding Flaw at Gas Pipeline by Measuring Magnetic Flux Leakage (누설자속 측정에 의한 가스배관의 용접결함에 대한 비파괴 탐상)

  • Ryu, Kwon-Sang;Park, Soo-Yung;Kim, Yong-Il;Lee, Wan-Kyu;Lim, Jae-Kyun;Nam, Young-Hyun
    • Journal of the Korean Institute of Gas
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    • v.12 no.2
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    • pp.53-56
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    • 2008
  • We have developed a system for nondestructive measurement of the magnetic flux leakage at welding flaws, existing in a gas pipeline by Hall sensor. For measuring the magnetic flux leakage, we designed a reference specimen having four kinds of welding flaws. Magnetic flux leakage is measured around the welding flaws of the specimen. The possibility for classification of different kinds of welding flaws is carried out by means of the peak-peak value and the interval between peak-peak of the magnetic flux leakage.

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