• Title/Summary/Keyword: Drillship

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FEA Procedure for Design Certification of Drillship Flare System (드릴십용 플레어 시스템의 설계승인을 위한 전산해석 절차)

  • Choi, Joo Hyoung;Heo, Tae Wook
    • Transactions of the KSME C: Technology and Education
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    • v.1 no.1
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    • pp.27-31
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    • 2013
  • The Flare system is the offshore plant equipment for protecting humans and equipments from high heat radiations of waste gas and oil burning. As Primary equipment of well test systems, the flare system is essential Class(DNV, ABS etc) design certification. Therefore, this paper is introduced to be related to computational analysis of flare system design certification procedure.

On the Fatigue Analysis of Large Crane Pedestal in Drillship (드릴십의 대형 크레인 페데스털의 피로해석에 관한 연구)

  • Lee, Jeong-Hoon;Lee, Joo-Sung
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.4
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    • pp.342-345
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    • 2011
  • Drillship has several large cranes to handle the various equipments for drilling work. These cranes are supported by crane pedestals which are installed on main deck. Two major loads, i.e., hull girder bending moment and crane operation loading shall be considered to confirm the structural strength in way of crane pedestal. In this paper, the fatigue analysis is performed for the structures in way of crane pedestal considering two(2) loads as mentioned in the above is introduced.

Repair Procedure and Structural Strength Analysis to Damage of Moon-Pool Structure for Drillship During Construction (드릴쉽 건조 중 문풀 구조 수정 작업 및 구조적 안정성 검토)

  • Yoo, In-Sang;Sohn, Sang-Young;Baek, Seung-Jung;Choi, Young-Lack;Yoo, Hae-Kun;Yoon, Ki-Jeong
    • Special Issue of the Society of Naval Architects of Korea
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    • 2011.09a
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    • pp.12-16
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    • 2011
  • During the shipbuilding construction, the repair works will be occurred by various reasons such as the natural disaster, mistakes of engineers or workers, defect of material, and so on. The one of the engineer's responsibilities is to design considering every possibility and to prevent the repair works due to the mistakes during construction stages, but actually it is very difficult and impossible to avoid every mistake. However, it is also the responsibility of engineers to find the best solution for the unavoidable mistakes which is to maintain the capacity of vessel and guarantee the safety for the repair works considering the construction schedules and economic cost. In this paper, it will be introduced the brief of repair works to the structural damage of the moon-pool structure in drillship which is built in our shipyard. For the verification of the structural strength, the fatigue analysis has been carried out based on the guide of Classification society. Furthermore, the modifications of structure design and welding procedure have been applied to avoid the stress concentration in the moon-pool structure.

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An Experimental Method of Model Installed Dynamic Positioning System for Drillship (드릴쉽에 대한 DPS 모형시험 기법개발)

  • Dong-Yeon Lee;Mun-Keun Ha
    • Journal of the Society of Naval Architects of Korea
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    • v.38 no.2
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    • pp.33-43
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    • 2001
  • The design and construction of special purpose vessels such as drillship and shuttle tankers have been increased. These vessels install the DPS(dynamic positioning systems) to maintain the position and heading for long-time operation. This paper deals with the experimental method for model-based DP system and the control theory and filter algorithms. In this experiment, the length of model ship is 4 meters and it has three thrusters to maintain the position. The ability of tracking along the given course and keeping of heading in waves are confirmed. For the calculation of thruster input the PID control theory are adopted and the effects of PID gain were investigated. To estimate the low frequency motions Kalman filter and digital filter were used and their effects were investigated.

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Understanding of Offshore Drilling System and Trend Analysis (해양 시추시스템 구성요소에 대한 이해 및 동향분석)

  • Woo, Nam-Sub;Kwon, Jae-Ki;Park, Jong-Myung;Kim, Sang-Shik;Kim, Young-Ju
    • Transactions of the KSME C: Technology and Education
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    • v.1 no.1
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    • pp.33-38
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    • 2013
  • Offshore drilling refers to a mechanical process where a wellbore is drilled through a seabed. It is typically carried out in order to explore for and subsequently extract petroleum which lies in rock formations beneath the seabed. There are many different type of facilities from which offshore drilling operations take place. These include bottom founded drilling rigs, combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units including semi-submersibles and drillships. These are capable of operating in water depths up to 3,000 m. In this paper, we introduce the drilling system, which is mounted on the offshore drilling facilities.

A Study on the Design Parameters of Controller for Dynamic Positioning System (자기위치 유지시스템 제어기의 설계변수에 관한 연구)

  • 이동연;하문근
    • Journal of the Society of Naval Architects of Korea
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    • v.40 no.1
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    • pp.8-19
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    • 2003
  • Special purpose vessels such as drillship and ocean research vessels install the DPS(Dynamic Positioning System) to maintain the position and heading for long-time operation. This paper deals with the design parameters for the control theory and filter algorithms of DP system. for the environmental loadings wind forces, current forces and wave forces were considered. In order to estimate the low frequency motions without first-order wave motion, the Kalman filter was used and it was assumed that the first-order wave forces correspond to system noises and first-order wave motions are measurement noises. In this simulation, the length of research vessel is 65 meters and it has four thrusters to maintain the position. The ability of keeping position and heading was confirmed. For the calculation of thruster input the LQR and LOI control theory were adopted and the effects of gain were investigated.

Fire extinguishing Performance of the Water mist nozzle for Accommodation of Cruise ships (특수선 및 크루즈선 거주구역용 미분무수 노즐의 화재진압성능평가 - 공공장소 화재시험 -)

  • Kwark, Ji-Hyun;Kim, Young-Han
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2010.04a
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    • pp.141-146
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    • 2010
  • 특수선(FPSO, Drillship)의 거주구역이나, 대형 여객선(크루즈선) 공간의 70% 이상을 차지하는 수용시설(accommodation) 즉, 객실, 라운지, 공공장소, 창고 등은 24시간 사람이 상주하는 구역임으로 화재로부터 완벽하게 보호되어야 한다. 이를 위해 국제해사기구(IMO)에서는 SOLAS II-2 Reg. 10.6과 FSS code Ch. 8에 적합한 미분무수 소화설비를 설치할 것을 강제화하고 있다. 이러한 미분무수 소화설비는 미분무수 노즐, 압력용기, 섹션밸브, 펌프유닛 등으로 구성되는데 특히 핵심부품인 미분무수 노즐은 IMO Res. MSC 265(84)에 따라 노즐성능시험 및 화재진압성능시험을 통해 형식승인을 득해야 한다. 본 연구에서 이러한 기준에 만족하는 미분무수 노즐을 개발하고자 선실 및 복도에 대한 화재시험에 이어 공공장소 화재시험을 수행하였으며, 두 가지 천장 높이에 대한 화재진압성능을 평가하였다.

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