• 대한조선학회논문집
• /
• 제43권2호
• /
• pp.258-267
• /
• 2006

The present piping modeling method requires detailed inputs from a designer to generate a piping model, and thus it takes much time for the designer to perform such task. Moreover, the piping model has no relation with that of hull structure. Thus, it is time-consuming and requires much effort if design changes arise. In this study, a method that generates quickly many pipes using a pipe tray and a conversion method that converts automatically the pipes into objects related with the hull structure are proposed. A piping modeling system based on the proposed methods is developed. The applicability of the developed system is demonstrated by applying it to the generation of the piping model of a deadweight 300,000ton VLCC(Very Large Crude oil Carrier). The results show that the developed system can quickly generate the piping model in relation with the hull structure.

• 플랜트 저널
• /
• 제11권1호
• /
• pp.39-49
• /
• 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.

• 동력기계공학회지
• /
• 제20권5호
• /
• pp.72-77
• /
• 2016

The present study investigates noise and condensation characteristics of polyvinyl chloride (PVC), which is widely used for drainage piping materials, complex double structure by comparing to those of PVC single structure piping materials. In addition, effects of insulation on drainage noise has been measured experimentally. As the results of the experiments, noise reduction effect of PVC complex double structure is superior to that of PVC single structure in terms of elbow and vertical piping materials which are employed for drainage pipes of toilet bowls and bathtub. The insulation barely have effect on the noise reduction in case of the PVC single structure since there is almost no changes in noise occurrence even though the insulation is applied on both elbow and vertical piping materials. Temperature differences between inside and outside of the pipes have been measures for the PVC single and complex double structures as well. In consequence, outside temperature of the PVC complex double structure is higher than that of the PVC single structure. The condensation occurrence time of the PVC complex double structure shows a distinct difference from that of the PVC single structure, thus, the PVC complex double structure has outstanding effect on preventing the condensation.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 추계학술대회논문집
• /
• pp.187-192
• /
• 2006

The effect where the multiple sound arrest ing goes mad to the human being does the zone. From like that cotton, this dissertation the both sides flag executed the research regarding a sound arresting reduction in the object in one example. It compared the piping structure which generally is space-time and a specific piping structure and it tested and research and the modeling regarding a sound arresting reduction the simulation which leads and it executed result and comparison of existing it analyzed. The duplication where the reduction effect is bigger the result general VG2 piping structure than escape it did with the fact that it appears the large effect the piping structure which it connects. Also, the straight pipe effect of multiple sound arresting could not go mad with the fact that.

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

• 한국지진공학회논문집
• /
• 제26권1호
• /
• pp.39-48
• /
• 2022

Many piping systems installed in the power plant are directly related to the safety and operation of the plant. Various dampers have been applied to the piping system to reduce the damage caused by earthquakes. In order to reduce the vibration of the piping system, this study developed a steel coil damper (SCD) with a straightforward structure but excellent damping performance. SCD reduces the vibration of the objective structure by hysteretic damping. The new SCD damper can be applied to high-temperature environments since it consists of steel members. The paper introduces a design method for the elastoplastic coil spring, which is the critical element of SCD. The practical applicability of the design procedure was validated by comparing the nonlinear force-displacement curves calculated by design equations with the results obtained from nonlinear finite element analysis and repeated loading test. It was found that the designed SCD's have a damping ratio higher than 25%. In addition, this study performed a set of seismic tests using a shaking table with an existing piping system to verify the vibration control capacity on the piping system by SCD. Test results prove that the SCD can effectively control the displacement vibration of the piping system up to 80%.

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

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

• 한국지반환경공학회 논문집
• /
• 제19권3호
• /
• pp.25-33
• /
• 2018

파이핑은 가장 대표적인 제방의 붕괴 유형으로 불투수성 수리구조물과 지반 경계면에서 Backward Erosion Piping인 루핑(Roofing)이 흔하게 발생한다. 루핑에 대한 검토는 주로 경험적 방법인 크립비를 이용하지만 이는 지반-구조물 경계면의 특성을 고려하지 않는 문제가 있다. 본 연구에서는 지반-구조물 경계면 특성이 루핑에 미치는 영향을 평가하기 위해 모형시험과 수치해석을 이용하여 파이핑 위험도를 고찰하였다. 모형시험에서 경계면 조도가 커질수록 파이핑 포텐셜이 감소함을 확인하였으며, 이를 수치해석에 적용하였다. 기존의 일반적인 수치해석방법은 수위차만을 고려하므로 경계면에서의 입자거동을 적절히 모사할 수 없다. 논문에서는 침투해석을 통해 침투력을 구하고, 입자해석기법을 이용해 파이핑의 입자거동을 모사한 침투-입자거동 연계해석을 수행하여 지반-구조물 경계면 조건에 따른 루핑 포텐셜을 조사하였다. 해석결과 경계면의 조도가 감소할수록 루핑 발생 확률이 증가함을 확인하였다.

• 한국해양공학회지
• /
• 제34권3호
• /
• pp.217-226
• /
• 2020

An offshore plant is an offshore platform that can process oil and gas resources in rough seas with a poor working environment. Moreover, it is a complex structure with different types of offshore facilities and a large amount of outfitting that connects different offshore installations. In particular, an enormous amount of various piping materials is installed in a relatively narrow space, and thus, the difficulty of working is relatively high compared to working in ships or ground plants. Generally, when the 3D detailed design is completed, an offshore plant piping process is carried out at the shipyard with ISO 2D fabrication drawings and ISO 2D installation drawings. If a worker wants to understand the three-dimensional piping composition in the working area, he can only use three-dimensional viewers that provide limited functionality. As offshore plant construction progresses, correlating work with predecessors becomes more complicated and rework occurs because of frequent design changes. This viewer function makes it difficult to identify the 3D piping structure of the urgently needed part. This study deals with the process support method based on a system using a 3D simulator to improve the efficiency of the piping process. The 3D simulator is based on the Unity3D engine and can be simulated by considering the classification and priority of 3D models by the piping process in the system. Further, it makes it possible to visualize progress information of the process. In addition, the punch content can be displayed on the 3D model after the pipe inspection. Finally, in supporting the data in relation to the piping process, it is considered that 3D-simulator-supported piping installing could improve the work efficiency by more than 99% compared to the existing method.