• Nuclear Engineering and Technology
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• 제55권10호
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• pp.3581-3590
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• 2023

High-temperature design evaluations were conducted on Type 316L stainless steel piping for a 700 ℃ large-capacity thermal energy storage verification test loop (TESET) under construction at KAERI. The hot leg piping with sodium coolant at 700 ℃ connects the main components of the loop heater, hot storage tank, and air-to-sodium heat exchanger. Currently, the design rules of ASME B31.1 and RCC-MRx provide design procedures for high-temperature piping in the creep range for Type 316L stainless steel. However, the design material properties around 700 ℃ are not available in those rules. Therefore, a number of material tests, including creep tests at various temperatures, were conducted to determine the insufficient material properties and relevant design coefficients so that high-temperature design on the 700 ℃ piping may be possible. It was shown that Type 316L stainless steel can be used in a 700 ℃ high-temperature piping system of Generation IV reactor systems or a renewable energy systems, such as thermal energy storage systems, for a limited operation time.

• 플랜트 저널
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• 제11권1호
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• pp.39-49
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• 2015

본 연구는 석유화학 플랜트 설계, 구매 시공에 직간접적으로 많은 영향을 주는 배관자재의 관리 효율성을 높이기 위하여 자재 코드 및 자재관리 시스템의 근간이 되는 배관자재 코드 분류체계를 개선하였다. 기존 배관자재 코드 분류체계를 개선하기 위하여 내재된 문제점을 자세히 파악하고 국내외 대형 EPC 기업의 배관자재 코드 분류체계 특징을 조사하였으며, 최근 대형화, 전문화 되어가는 프로젝트의 특성을 고려하여 개선 방향을 설정하였다. 배관 자재별 특성에 맞는 코드분류체계를 정의하고, 표준 속성을 추가하고, 신규 자재 및 재질을 고려한 코드 자릿수 확장 및 계층적 분류 구조를 통하여 효율적 배관 자재관리를 위한 배관 자재 코드 분류체계의 개선 구조를 도출하였다. 개선된 배관자재 코드 분류체계를 수행중인 프로젝트에 적용한 결과, 자재 구매사양서의 재 작업률이 평균 4.98%에서 2.48%로 감소하였으며, 3차원설계에서 요구되는 배관 형상 구축 작업시간이 기존 평균 작업인원 2명이 6개월 소요 되었으나, 1명이 4개월로 67% 감소 효과를 가져왔다. 또한 피라미드 코드 구조를 통하여 전사 자재관리 시스템과 연동되어 구매, 견적 등 유관 부서에서 다양한 데이터를 축적하고 내부 경영관리 의사결정을 위한 프로젝트 분석에 활용할 수 있게 되었다.

• 한국화재소방학회논문지
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• 제32권2호
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• pp.38-47
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• 2018

본 연구에서는 배관 재료의 물성을 고려한 공학적 내진설계방식과 소방시설의 내진설계의 기준에 따른 사양위주의 설계방식에 대하여 비교 분석하였다. 배관 재료의 물성을 고려한 내진설계 방식의 경우는 배관에서 발생되는 비틀림 응력과 굽힘 응력의 합성 값을 통해 배관의 안전성을 분석하게 된다. 하지만 사양위주의 설계방식의 경우는 배관 재료의 안전성이 아니라 배관이 움직이는 힘을 해석하여 흔들림 방지버팀대가 견딜 수 있는지 여부를 해석하고 있다. 소화배관은 하나의 연결된 구조체로 일정구간에서 발생되는 흔들리는 힘을 통해서는 배관의 안전성을 보장받을 수 없기 때문에 배관 재료의 응력과 변위의 안전성 분석을 통해서 가능하다. 그러므로 안전성 있는 소화 설비 배관의 내진설계를 위해서는 배관 재료의 물성과 건축 구조물의 내진성능을 고려한 해석방법을 적용할 필요가 있다.

• 설비공학논문집
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• 제29권4호
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• pp.185-194
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• 2017

Currently, in comparison with other architectural estimations, the estimation work regarding building mechanical-service systems is time-consuming, and the process is continuously becoming more difficult because of the increased usage of the attached piping materials such as fittings and hangings in addition to their complicated construction processes. To improve this problem, the Korean authority provides a simple estimation method for the attached-material rate regarding the main piping material, which is the most time-consuming work in the architectural-mechanical estimation. However, to be an applicable method on construction sites, a proper conversion rate of the attached-piping material is still required for the proposed method regarding building usage and working types. Therefore, the purpose of this research is the calculation of the rate of the attached-piping materials such as the fittings and supports through the building of the mechanical-service work types of mechanical rooms, air conditioning, domestic water and hot-water supplies, and the drain-, vent-, and gas-piping work in office buildings that have been designed after 2010.

• 대한조선학회논문집
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• 제55권3호
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• pp.243-251
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• 2018

In the shipyard, a lot of data is generated, stored, and managed during design, construction, and operation phases to build ships and offshore structures. However, it is difficult to handle such big data efficiently using existing data-handling technologies. As the big data technology is developed, the ship and offshore industries start to focus on the existing big data to find valuable information from it. In this paper, the material requirement estimation method of offshore structure piping materials using big data analysis is proposed. A big data platform for the data analysis in the shipyard is introduced and it is applied to the analysis of material requirement estimation to solve the problems in piping design by a designer. The regression model is developed from the big data of piping materials and verified using the existing data. This analysis can help a piping designer to estimate the exact amount of material requirement and schedule the purchase time.

• 대한건축학회연합논문집
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• 제20권6호
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• pp.1-8
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• 2018

In generally, the estimation work regarding building mechanical service system in comparison with other architectural estimations is time-consuming, and the process is continuously getting more difficult because of the increased usage of the attached piping materials such as fittings and supports in addition to their complicated construction processes. In order to improve this problem, the Korean authority provides a simple method to estimate the attached material rate regarding the main piping material, which is the most time-consuming work in the architectural mechanical estimation. However, to be an applicable method on construction site, a proper conversion rate of the attached piping material is still required for the proposed method regarding building usage and working types. Therefore, the purpose of this research is the suggestion of the material and labor cost rate of the attached piping materials such as the fittings and supports by work types and fitting methods of indoor fire, sprinkler, and extinguishing gas piping work of mechanical fire protection facilities in office buildings that have been designed after 2010.

• Current Research on Agriculture and Life Sciences
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• 제3권
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• pp.44-54
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• 1985

In order to determine the critical head values of boiling and piping, several experiments were performed for 3 cases of model dykes on 7 kinds of pervious foundations. The results obtained are as follows : 1. It appears that the coarser and the denser the foundation material, the higher the critical heads of boiling and piping, and that the lower the permeability of the foundation, the higher the critical heads of boiling and piping. 2. A difference in head between the moments of boiling and piping is greater in the case 2 or case 3 than in the case 1 because of the additional hydraulic resistance. And it is found that the coarser the foundation material, the greater the head difference. 3. The critical heads of boiling and piping is directly prortional to the seepage length. 4. The piezometric heads close to the singular point are of the same magnitude, provided that the geometry of the model dyke and foundation material are the same. 5. Variations of the weight of model dyke can not affect the critical head. According to the conclusions shown above, the critical head of piping can be more practically predicted for prototype using the results from laboratory tests on scale model.

• Ocean Systems Engineering
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• 제9권1호
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• pp.79-95
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• 2019

The material analysis of an offshore structure is generally conducted in the contract design phase for the price quotation of a new offshore project. This analysis is conducted manually by an engineer, which is time-consuming and can lead to inaccurate results, because the data size from previous projects is too large, and there are so many materials to consider. In this study, the piping materials in an offshore structure are analyzed for contract design using a big data framework. The big data technologies used include HDFS (Hadoop Distributed File System) for data saving, Hive and HBase for the database to handle the saved data, Spark and Kylin for data processing, and Zeppelin for user interface and visualization. The analyzed results show that the proposed big data framework can reduce the efforts put toward contract design in the estimation of the piping material cost.

• 대한조선학회논문집
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• 제55권2호
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• pp.124-135
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• 2018

In order to secure manufacturing competitiveness of offshore plants, piping process is one of the most important processes. This study is about the design of management system for piping materials manufacturing of the offshore plant. As a result of the study, we analyzed the system and algorithms needed for the processing of piping material products and designed the structure of the entire management system. We conducted a process analysis of the design, manufacturing and installation processes. And also we proposed a system structure to improve the various problems that have come out. We also proposed an algorithm to determine the delivery order of the pipe spools, and proposed a raw material management system for the manufacturing of the pipe spools. And we designed a manufacturing process management system to manage the risk of pipe materials delivery. And finally we proposed a data structure for the installation process management system. The data structures and algorithms were actually implemented, and applied the actual process data to verify the effect of the system.

• 한국해양공학회지
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• 제15권3호
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• pp.63-68
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• 2001

SG-365 steel is an important material and used for manufacturing a pressure vessel which the gas piping. In this investigation, the elastic plastic fracture toughness of this material is evaluated by the an unloading compliance method according to the ATM E813-97 method on the smooth and side groove 1CT specimens. The effect of smooth and side groove is studied on the elastic plastic fracture toughness. The side grooved specimen is very useful in estimation of the $J_IC. Because it is much easier than the smooth specimen to the onset of the ductile tearing by the R curve method. Besides, it improves the accuracy of toughness values, decreases the scattering of them and tunneling and shear lip by the side groove.