배관 체계 자율 복구 알고리즘 비교, 분석 및 고찰

양대원,이정훈,신윤호,Yang, Dae Won,Lee, Jeung-hoon,Shin, Yun-Ho 한국안전학회 2021 한국안전학회지 Vol.36 No.4

Piping systems comprising pumps and valves are essential in the power plant, oil, and defense industry. Their purpose includes a stable supply of the working fluid or ensuring the target system's safe operation. However, piping system accidents due to leakage of toxic substances, explosions, and natural disasters are prevalent In addition, with the limited maintenance personnel, it becomes difficult to detect, isolate, and reconfigure the damage of the piping system and recover the unaffected area. An autonomous recovery piping system can play a vital role under such circumstances. The autonomous recovery algorithms for the piping system can be divided into low-pressure control algorithms, hydraulic resistance control algorithms, and flow inventory control algorithms. All three methods include autonomous opening/closing logic to isolate damaged areas and recovery the unaffected area of piping systems. However, because each algorithm has its strength and weakness, appropriate application considering the overall design, vital components, and operating conditions is crucial. In this regard, preliminary research on algorithm's working principle, its design procedures, and expected damage scenarios should be accomplished. This study examines the characteristics of algorithms, the design procedure, and working logic. Advantages and disadvantages are also analyzed through simulation results for a simplified piping system.

Base-Isolated NPP의 Interface 배관계통에 대한 내진해석방법 연구

김대수(Daesoo Kim),이효승(Hyoseung Lee),류동원(Dongwon Lyu),김수겸(Sookyum Kim),장성철(Seongcheol Jang) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

A study of the application of seismic isolation system have been widely researched in order to increase the safety of seismic analysis for nuclear power plant(NPP). In the design of base isolated NPPs, the seismic analysis of interface piping system multi-supported between base-isolated and fixed building is one of the key issues. For the seismic design of interface piping system, it is needed not only rigidity to withstand the force of the inertia response generated by excitations from base-isolated and fixed building but also flexibility to cope with the large relative displacements between two buildings. In order to meet seismic requirements of interface piping system, this paper utilized two methods to perform the seismic analysis of MS interface piping system. First, in order to satisfy the rigidity requirement of MS interface piping system, this paper adapts Multiple Input Response Spectrum (MIRS) method together with the SRSS combination between support groups, USNRC Regulatory Guide 1.61 damping as seismic analysis method to consider different vibration characteristics of base-isolated and fixed building. Second, in order to secure the flexibility of MS interface piping system, this paper use the method to adjust the stiffness of pipe supports installed on MS interface piping system, and performs the sensitivity study on the stiffness of pipe support to find the optimal stiffness that can distribute the excessive piping stress and support loads occurred in the local portion of MS interface piping system.

지역난방 이용 공동주택 통합배관시스템의 효용성 검증

오규성(Gyu Sung Oh),김영일(Young Il Kim),김선혜(Sean Hay Kim) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.10

This study validates effectiveness of a combined piping system for an apartment using district heating. The existing district heating system is composed of four pipes (four-pipe system), but the suggested combined piping system is composed only of two pipes (two-pipe system). Thanks to this simplification, the two-pipe system will reduce heat loss of supplied heating energy. Performance of the four-pipe system and the two-pipe system were analyzed using TRNSYS 17 in the aspect that 1) If it can provide sufficient heating energy for space heating and hot water simultaneously, and 2) How much of the heat loss of the hot water supply pipe may be reduced. Measured energy consumption were compared with simulation results, that revealed good agreement. This study also proposes an optimal operation strategy of the hot water set temperature for the two-pipe system. It is confirmed that the two-pipe system can provide sufficient heating energy and uses less energy compared to the four-pipe system.

라이프라인의 Smart-Pipe 시스템 도입을 위한 이익정량화 방안

전환돈,김중훈,조문수,백천우,유도근 한국방재학회 2008 한국방재학회논문집 Vol.08 No.04

As the water distribution system which is one of the critical lifeline system is deteriorated and pipe failures occur frequently, the more efficient pipe monitoring system becomes a critical issue in the water industry. One of the pipe monitoring systems is called "Smart-pipe" which is permanent, comprehensive and an automated SIM (Structural Integrity Monitoring) system and has superiorities to existing monitoring system. To implement a smart-pipe on a water distribution system, assessment of its indirect benefit obtaining from smart-pipe such as the ratio of preventing water main failures must be preceded. However, only some researches on this field have been performed. In this paper, the concept of smart-pipe is compared with the current monitoring systems for a water distribution system, and a method to quantify its benefit using the inconvenient time for customers in man-hours is suggested. The suggested method was applied to a real water distribution system to estimate its applicability and benefit. 상수관망의 노후화에 따른 잦은 파괴로 인해 보다 효율적인 상수관망 모니터링시스템 구축이 중요한 문제가 되었다. 상수관망의 모니터링 시스템의 하나인 smart-pipe는 영구적이며 포괄적인 자동화된 형태의 SIM 시스템으로 기존의 모니터링 시스템에 비해 많은 장점을 가지고 있다. Smart-pipe를 도입하기 위해서는 상수관 파괴를 미리 예측하여 갑작스러운 상수관 파괴를 막는 것과 같이 smart-pipe 설치를 통해 발생하는 간접적 이익의 정량화가 우선되어야 한다. 그러나 이와 관련된 연구는 국내외적으로 매우 미비한 실정이다. 본 연구에서는 smart-pipe의 개념을 기존 상수관 모니터링 시스템과 비교하였으며 smart-pipe 설치에 따른 이익을 수용가불편시간으로 정량화하는 방안을 제시하였다. 제안된 방법을 고양시의 상수관망에 적용하여 적용성을 검증하였으며, smart-pipe시스템의 도입을 위한 기초자료로 활용될 수 있을 것으로 판단되었다.

면진 원전 면진-비면진구간 연결 배관의 내진성능 평가

함대기,박준희,최인길 한국지진공학회 2014 한국지진공학회논문집 Vol.18 No.3

A methodology to evaluate the seismic performance of interface piping systems that cross the isolation interface in the seismically isolated nuclear power plant (NPP) was developed. The developed methodology was applied to the safety-related interface piping system to demonstrate the seismic performance of the target piping system. Not only the seismic performance for the design level earthquakes but also the performance for the beyond design level earthquakes were evaluated. Two artificial seismic ground input motions which were matched to the design response spectra and two historical earthquake ground motions were used for the seismic analysis of piping system. The preliminary performance evaluation results show that the excessive relative displacements can occur in the seismically isolated piping system. If the input ground motion contained relatively high energy in the low frequency region, we could find that the stress response of the piping system exceed the allowable stress level even though the intensity of the input ground motion is equal to the design level earthquake. The structural responses and seismic performances of piping system were varied sensitively with respect to the intensities and frequency contents of input ground motions. Therefore, for the application of isolation system to NPPs and the verification of the safety of piping system, the seismic performance of the piping system subjected to the earthquake at the target NPP site should be evaluated firstly.

3D CAD 모델 기반 해양플랜트 배관 공정 모니터링 시스템 개발

김현철,이규홍 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.2

3D Models of offshore plant piping materials designed by 3D CAD systems are provided to the production processes in the form of 2D piping drawings and 2D piping installation drawings. In addition to the standard engineering information, the purchasing, procurement, manufacturing, installation, and inspection of raw materials are managed systematically in an integrated process control system. The existing integrated process management system can help reduce the processing time by managing the flow and progress of resources systematically, but it does not include 3D design model information. Hence, it is difficult to understand complicated pipe structures before installing the pipe. In addition, when design changes or immediate design modifications are required, it is difficult to find related data or exchange information quickly with each other. To solve this problem, an offshore plant-piping process-monitoring system was developed based on a 3D model. The 3D model-based piping monitoring system is based on Visual Studio 2017 C# and UNITY3D so that the piping-process work information can be linked to the 3D CAD model in real time. In addition, the 3D model could check the progress of the pipe installation process, such as block, size, and material, and the progress of functional inspection items, such as cleaning, hydraulic inspection, and pneumatic inspection. 3D CAD 시스템으로 설계된 해양플랜트 배관재 모델들은 2D 배관 제작도와 설치도의 형태로 생산 공정에 제공되고, 기본 엔지니어링 정보와 함께 통합 공정관리시스템에서 원자재의 구매, 조달, 제작, 설치 및 검사가 체계적으로 관리되어 진행된다. 기존의 통합 공정관리시스템은 자원의 흐름 및 진행 상황을 체계적으로 관리하여 공정 시수 절감에 많은 기여를 하고 있지만, 3D 설계 형상 모델 정보를 포함하고 있지 않기 때문에 배관 설치 작업 전에 복잡한 배관 구조를 파악하거나, 잦은 설계 변경으로 인해 연관된 도면을 찾을 때 상호간 신속한 정보 교류가 어려운 단점을 가지고 있었다. 이러한 문제점을 해결하기 위해 3D 모델을 기반으로 하는 해양플랜트 배관 공정 모니터링 시스템을 개발하였다. 본 시스템은 3D 모델 기반 배관 모니터링 시스템은 Visual Studio 2017 C#과 UNITY3D를 기반으로 배관 공정 작업 정보가 3D CAD 모델과 실시간 연동될 수 있도록 구성하였다. 그리고 블록, 크기, 재료에 따른 배관 설치 공정 진행 흐름 뿐만 아니라, 청소, 수압검사, 공압검사 등 기능 검사 항목별 진행 흐름을 3D 모델상에서 실시간으로 확인할 수 있도록 하였다. 작업자는 개발된 시스템을 통해 생산 현장에서 실시간으로 배관 공정 진행 흐름을 포함한 3D CAD 모델을 쉽게 파악함으로써 작업 효율성 향상에 많은 기여를 할 것으로 기대된다.

유동식 그루브 조인트로 연결된 엘보 요소의 한계상태 평가

김성완,윤다운,전법규,박동욱,장성진 한국구조물진단유지관리공학회 2024 한국구조물진단유지관리공학회 논문집 Vol.28 No.3

배관시스템은 다양한 산업 분야에서 이용되는 중요한 설비이며 생활 및 안전과 관련된 영역에서 사용되고 있다. 배관시스템은 건축물 및 시설의 주요 구조부에 고정되어 있으나 외부 하중을 지지하지 않으며 주어진 고유기능을 수행하는 비구조요소이다. 지진하중으로 인한 배관시스템은 두 지지점 사이의 서로 다른 거동으로 발생하는 위상차로 인한 상대 변위의 영향을 받으며 변위 지배적인 반복거동 때문에 손상이 발생할 가능성이 있다. 배관시스템에서 피팅과 조인트는 지진하중에 취약한 대표적인 요소이다. 배관시스템의 피팅과 조인트에 대한 내진성능과 한계상태를 평가하고자 한다면 상대변위를 모사하기 위한 높은 스트로크를 가지는 엑츄에이터가 필요하나 실험을 수행할 수 있는설비가 많지 않아 어려움이 있다. 따라서 피팅과 조인트로 연결된 배관시스템의 내진성능과 한계상태를 평가하기 위해서는 요소 단위의 실험이 필요하다. 이 연구에서는 수직배관시스템에서 지진하중에 취약한 요소인 피팅과 조인트를 포함하는 엘보 시험체에 대하여 내진성능을 평가하는 방법을 제시하였다. 엘보 시험체는 90° 배관 엘보의 양단에 직관부를 유동식 그루브 조인트를 이용하여 연결하였다. 엘보 시험체에 대하여 변형각에 기반을 둔 주기하중 프로토콜을 이용하여 내진성능을 평가하였다. 평가된 내진성능에 대한 여유도를 확인하기 위하여 일정한진폭에 대한 주기하중을 적용하여 한계상태를 평가하였다. Piping systems are crucial facilities used in various industries, particularly in areas related to daily life and safety. Piping systems are fixed to the main structures of buildings and facilities but do not support external loads and serve as non-structural elements performing specific functions. Piping systems are affected by relative displacements owing to phase differences arising from different behaviors between two support points under seismic loads; this can cause damage owing to the displacement-dominant cyclic behavior. Fittings and joints in piping systems are representative elements that are vulnerable to seismic loads. To evaluate the seismic performance and limit states of fittings and joints in piping systems, a high-stroke actuator is required to simulate relative displacements. However, this is challenging because only few facilities can conduct these experiments. Therefore, element-level experiments are required to evaluate the seismic performance and limit states of piping systems connected by fittings and joints. This study proposed a method to evaluate the seismic performance of an elbow specimen that includes fittings and joints that are vulnerable to seismic loads in vertical piping systems. The elbow specimen was created by connecting straight pipes to both ends of a 90° pipe elbow using flexible groove joints. The seismic performance of the elbow specimen was evaluated using a cyclic loading protocol based on deformation angles. To determine the margin of the evaluated seismic performance, the limit states were assessed by applying cyclic loading with a constant amplitude.

PIV와 신경망을 이용한 배관시스템 원격 미세변위 측정과 실시간 작동상태 진단

전민규,조경래,오정수,이창제,도덕희 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.3

Piping systems play an important role in gas and oil transferring system. In the piping system, there are many elements, such as valves and flow meters. In order to check their normal operating conditions, each signal from each element is displayed on the monitor in the pipe control room. By the way, there are several accidental cases in the piping system even if all signals from the local elements are judged to be normal on the monitor in the control room. Further, opposite cases often happen even the monitor shows abnormal while the local elements work normal. To overcome this abnormal functions, it is not so easy to construct the environment in which sensors detecting the working states of all elements installed in the piping system. In this paper, a new non-contact measurement technique which can calculate the elements' delicate displacements by using a PIV(particle image velocimetry) and diagnose their working states by using a neural network is proposed. The measurement system consists of a host computer, a micro system, a telescope and a high-resolution camera. As a preliminary test, the constructed measurement system was applied to measure delicate vibrations of mobile phones. For practical application, a pneumatic system was measured by the constructed system.

고온 배관 시스템의 손상부위 확인을 위한 시스템 응력 해석 적용에 대한 연구

김주용(Joo Yong Kim),유종민(Jong Min Yu),딘 홍보(Dinh Hong Bo),흐튠 녜인(Htun Nyein Chan Zan),윤기봉(Kee Bong Yoon),김지윤(Ji Yoon Kim) 한국위험물학회 2015 한국위험물학회지 Vol.3 No.1

Petrochemical piping usually carries out high flammable and explosible gas under high pressure and high temperature, so it always has a risk of being damaged and failed. When damaged is worried in pipe components such as T-section, it is usual practice to conduct the system stress analysis to check the high stress is probable cause of damage. In this study, system stress analysis was conducted under three conditions of a process piping system with two T-sections. i.e, design condition, steady operating condition and start-up process condition. Since some damage was detected in a T-section, it should be confirmed that the cause of the damage is high system stress caused by thermal distortion of the piping. Results show that the cause of the damage cannot be the system stress but the other causes such as material defect or improper internal process fluid. Advantages and disadvantages of the system stress analysis method for root cause analysis are also discussed.

화력발전소 고온배관의 진단 및 실시간 변위감시

허재실(J.S. Heo),현중섭(J.S. Hyun),허정렬(J.R. Heo),이성기(S.K. Lee),조선영(S.Y. Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

High temperature steam pipes of fossil power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue mechanisms and poor or mal functional support assemblies can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical pipe system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-Dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder type sensors, this system was installed and operated on the Y fossil power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.