• Title/Summary/Keyword: Offshore plant

Search Result 405, Processing Time 0.027 seconds

Experimental Investigation of the Hydrodynamic Force Acting on Ship Hull and Rudder in Various Wave Direction

  • Nguyen, Van Minh;Nguyen, Tien Thua;Seo, Juwon;Yoon, Hyeon Kyu;Kim, Yeon Gyu
    • Journal of Advanced Research in Ocean Engineering
    • /
    • v.4 no.3
    • /
    • pp.105-114
    • /
    • 2018
  • In the past, traditional methods of research on ship maneuvering performance were estimated in calm waters. However, the course-keeping ability and the maneuvering performance of a ship can be influenced by the presence of waves. Therefore, it is necessary to understand the maneuvering behavior of a ship in waves. In this study, the force acting on a moving ship and a rudder behind the model ship will be performed in regular waves in Changwon National University (CWNU). In addition, the prediction force acting on the rudder in calm waters was carried out and compared with those of Computational Fluid Dynamics (CFD). Model test in regular wave was performed to predict the force acting on the ship and the rudder behind the model ship in various wave directions. The effects of wavelength and wave direction on hydrodynamic forces acting on the ship hull versus rudder angle is discussed.

A Study on the optimal design of lattice boom crane for offshore plant (해양플랜트용 라티스 붐 크레인의 최적 설계에 관한 연구)

  • Kim, Hyun-ji;Kim, Ji-hye;Park, Sang-hyeok;Choi, Si-yeon;Huh, Sun-chul
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.22 no.6
    • /
    • pp.757-765
    • /
    • 2019
  • In manufacturing An offshore plant is a structure that produces resources buried in the seabed. It can be classified into fixed, floating, and hybrid methods depending on the installation method. In particular, the Lattice boom type crane is typically used because it is used for a long time in the sea and moves to other seas, which is less affected by wind. In this study, the crane was designed by using three-step optimization design in the early stage of the design of Lattice boom crane for offshore plant. Finite element analysis was performed to verify the safety factor, deflection, buckling coefficient and fatigue life of the designed crane and the results were verified.

A Study on the Decommissioning of Oil and Gas Platform (오일 및 가스 플랫폼의 해체에 관한 연구)

  • Jeon, Chang Su
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.23 no.6_2
    • /
    • pp.1081-1091
    • /
    • 2020
  • The most recent issue of offshore plants that produce oil and gas are the decommissioning engineering of aged or discontinued platforms. There are many platforms that are being dismantled in the United States, Europe, and areas in Southeast Asia. In particular, more than 400 old platforms in Southeast Asia (Indonesia, Malaysia) are preparing to dismantle. They are spread out across Southeast Asia with a water level of 50 meters and small-scale of less than 10,000 tons. However, this offshore plant decommissioning market is a very suitable market for small and medium-sized shipyards in Korea to enter with their established equipment and engineers. Platform decommissioning is conducted according to decommissioning procedures. However, there are some difficulties in market advances as no developed case studies or process models are established on how platform structures and components are to be dismantled and how the dismantled material is to be reused and recycled. Therefore, this study presented domestic and foreign regulations on the reuse and recycling of oil and gas producing offshore plant platforms, case analyses on developed decommissioning engineering, platform reuse and recycling guidelines, and platform and pipeline decommissioning processes and methods.

Integrated engineering environment for the process FEED of offshore oil and gas production plants

  • Hwang, Ji-Hyun;Roh, Myung-Il;Lee, Kyu-Yeul
    • Ocean Systems Engineering
    • /
    • v.2 no.1
    • /
    • pp.49-68
    • /
    • 2012
  • In this paper, an offshore process front end engineering design (FEED) method is systematically introduced and reviewed to enable efficient offshore oil and gas production plant engineering. An integrated process engineering environment is also presented for the topside systems of a liquefied natural gas floating production, storage, and offloading (LNG FPSO) unit, based on the concepts and procedures for the process FEED of general offshore production plants. Various activities of the general process FEED scheme are first summarized, and then the offshore process FEED method, which is applicable to all types of offshore oil and gas production plants, is presented. The integrated process engineering environment is presented according to the aforementioned FEED method. Finally, the offshore process FEED method is applied to the topside systems of an LNG FPSO in order to verify the validity and applicability of the FEED method.

NUMERICAL ANALYSIS FOR FLOW CHARACTERISTICS WITH GEOMETRIC SHAPE AND CONTROL CONDITIONS IN SUBSEA BY-PASS VALVE (심해저 바이패스 밸브의 기하학적 형상과 제어조건에 따른 유동특성에 관한 수치해석적 연구)

  • Lee, J.H.;Min, C.H.;Oh, J.W.;Cho, S.;Kim, H.W.
    • Journal of computational fluids engineering
    • /
    • v.21 no.2
    • /
    • pp.99-105
    • /
    • 2016
  • The present study has been carried out to analyze the flow characteristics with geometric shape and control conditions in subsea by-pass valve. The function of by-pass valve is to prevent reverse flow. In this study, the static analysis has been perform for analyzing fluid flow in open state. In order to consider the turbulent effect, the standard ${\kappa}-{\varepsilon}$ model was used. A variety of parametric studies, such as by-pass valve type or size, volume flow rate, leakage hole size, leakage hole position, block type, block shape, were performed. The pressure difference across the valve in the model broadened the flow channel cross-sectional area was greater than the base model for the same operating conditions. As the pipe diameter in the block decreases the pressure difference is greatly increased. The pressure difference according to block shape such as edge type and round was almost negligible. For the same Reynolds number the pressure difference was little changed according to the size of the valve.

Study of a Photovoltaic System as an Emergency Power Supply for Offshore Plant Facilities (해양플랜트 설비의 비상전원공급을 위한 태양광 발전시스템 연구)

  • Choi, Gun Hwan;Lee, Byung Ho;Jung, Rho-Taek;Shin, Kyubo
    • Journal of Ocean Engineering and Technology
    • /
    • v.32 no.4
    • /
    • pp.279-286
    • /
    • 2018
  • The use of eco-friendly energy in the offshore plant system is expanding because conventional generators are operated by fossil fuel or natural gas. Eco-friendly energy, which replaces existing power generation methods, should be capable of generating the power for lighting protection equipment, airborne fault indication, parameter measurement, and others. Most of the eco-friendly energy used in offshore plant facilities is solar and wind power. In the case of using photovoltaic power, because the structure must be constructed based as flat solar panels, it can be damaged easily by the wind. Therefore, there is a need for a new generation system composed of a spherical structure that does not require a separate structure and is less influenced by the wind. Considering these characteristics, in this study we designed, fabricated, and tested a unit that could provide the most efficient spherical photovoltaic power generation considering wind direction and wind pressure. Our test results indicated that the proposed system reduced costs because it did not require any separate structure, used eco-friendly energy, reduced carbon dioxide emissions, and expanded the proportion of eco-friendly energy use by offshore plant facilities.

Hydraulic Cylinder Design of Lifting Pump Mounting and Structural Safety Estimation of Mounting using Multi-body Dynamics (다물체 동역학을 이용한 양광펌프 거치대의 유압 실린더 설계 및 구조 안전성 평가)

  • Oh, Jae-Won;Min, Cheon-Hong;Lee, Chang-Ho;Hong, Sup;Kim, Hyung-Woo;Yeu, Tae-Kyung;Bae, Dae-Sung
    • Journal of Ocean Engineering and Technology
    • /
    • v.29 no.2
    • /
    • pp.120-127
    • /
    • 2015
  • When a deep-seabed lifting pump is kept this device has bending and deformation in the axis due to its long length(8m). These influences can be caused a breakdown. Therefore, a mounting must be developed to keep the lifting pump safe. This paper discusses the hydraulic cylinder design of the lifting pump and structural safety estimation of the mounting using SBD(simulation-based design). The multi-body dynamic simulation method is used, which has been used in the automotive, structural, ship building, and robotics industries. In this study, the position and diameter of the hydraulic cylinder were determined based on the results of the strokes and buckling loads for the design positions of the hydraulic cylinder. A structural dynamic model of the mounting system was constructed using the determined design values, and the structural safety was evaluated using this dynamic model. According to these results, this system has a sufficient safety factor to manufacture.

Analysis for Nonlinear Turbine Effect of Inclined OWC Wave Energy Converter (경사형 진동수주 파력발전장치의 비선형 터빈효과의 분석)

  • Kim, J.S.;Nam, B.W.;Park, S.W.;Kim, K.H.;Shin, S.H.;Hong, K.Y.
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2018.11a
    • /
    • pp.59-60
    • /
    • 2018
  • The oscillating-water-column wave energy converter represents the complex physical characteristics associated with the water column, turbines, generator, and power converter. This study focuses on the derivation of the physical relationship between the water column and turbine based on the 1/ 4 scale model test. The aerodynamic characteristics of the OWC ducted turbine were simulated using an orifice. The turbine effect, a key element in the OWC-chamber performance evaluation, can be represented by the flow rate and pressure drop through the orifice. The turbine effect of OWC-WEC was confirmed to have a non-linear relationship from the measured flow rate and pressure drop in the model test.

  • PDF

Installation of Meteorological Mast for the Test Bed of Offshore Wind Power (서해 100MW 해상풍력 실증단지 기상타워 구축사례)

  • Ryu, Moosung;Kang, Keumseok;Kim, Jiyoung;Lee, Junshin
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2011.05a
    • /
    • pp.55.2-55.2
    • /
    • 2011
  • The final site of offshore wind power plant should be decided by comprehensive examination of various conditions such as wind resource, sea depth, geology, grid connection, social circumstance and environmental issue. Wind condition is typically regarded as the most important factor because wind energy increases in proportion to wind velocity and it directly relates to the amount of power output, efficiency of power plant and profitability. Advanced countries in the offshore wind power sector such as Denmark, UK and Germany, they are analyzing wind resource accurately by installing the meteorological mast in the ocean in order to get the optimal type of wind turbine and maximum generation efficiency. Also, it is made much of designing offshore power plant on the basis of actual measurement by met-mast and those wind farms have a chance to get the loan with reduced interest rate in project financing. In Korea, the HEMOSU-1 is installed in the ocean around Wido island to analyze wind resource of test bed of 100MW offshore wind power on october last year. This paper deals with the design and construction procedure of the first met-mast in Korea and also shows the site characteristics of test bed. Therefore, this paper will give useful information to local governments and private business sector who are trying to construct offshore wind farm and it can also be a good reference for the following projects of meteorological mast in near future.

  • PDF

Challenges and Strategies for Commissioning of FLNG

  • Lee, Dong Hyun;Seo, Kwang Su;Yeo, Jong Su;Kim, Myung Ki
    • Journal of Advanced Research in Ocean Engineering
    • /
    • v.2 no.3
    • /
    • pp.129-135
    • /
    • 2016
  • After the construction of offshore plants, the function and integrity of system in offshore plants should be commissioned. As the executor of many FLNG projects, Samsung Heavy Industries Co., Ltd has faced some challenges for commissioning which are not similar to those in other offshore project. This study shows the differences between the commissioning of typical offshore projects and the one of FLNG projects. By the characteristics of offshore, performing the commissioning activity of FLNG near shipyard as much as possible reduces the risk of malfunction. The possible solutions to achieve these strategies are introduced.