• Title/Summary/Keyword: Chemical Tanker

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An Investigation on the Optimal Ship Size for Chemical Tankers by Main Shipping Routes (케미컬 탱커선 운항노선별 최적선형에 관한 연구)

  • Kim, Jae-Ho;Kim, Taek-Won;Woo, Su-Han
    • Journal of Navigation and Port Research
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    • v.39 no.6
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    • pp.439-450
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    • 2015
  • This study objects to find characteristics in chemical tanker markets and to determine optimal chemical tanker size using a total shipping cost in main trading route of asia chemical tankers .Precedent studies of determination of the optimal ship size and case studies about chemical tankers was carried out and tried to introduce a cost model which is applicable to chemical tanker. This study is dependant on numerical analysis and involves scenario analysis to minimize sensitivity of results. This analysis shows as follows. First, 12,000DWT tanker is an optimal size on the 'Far East-Middle East' services, 9,000DWT tanker is a most competitive on the 'Far East-South East Asia' services and 3,000DWT tanker is a most economic size on the 'Inner Far East' services at average market situation. Second, the bigger size of chemical tanker, the more competitive advantage the tanker will obtain when bunker fuel prices rise. Small size ship gets more competitive during bunker prices down. Third, market fluctuation of time charter rate for chemical tanker is less than 20% against its average time charter hire which means less volatile. And tanker's competitiveness per each size is remained mostly same when time charterer rates rise at same proportion. Fourth, bigger size chemical tankers have cost advantages when tanker's quantity of each part cargo increase. And small-sized tanks are more competitive when part cargo scales decrease. For the last, ship's port stay strongly influences on the determination of the optical tanker size. When vessel has shorter port stay, bigger-sized tanker will be more competitive and even can be competitive if applies in short voyage as well.

Structural Safety Evaluation for 75,000 TDW Chemical Tanker Applied Common Structural Rules (CSR을 적용한 75,000 TDW 화학제품 운반선의 구조 안전성 평가)

  • Sim, Ye-Eun;Haa, Chung-In;Nam Gung, Mun;Kim, Gi-Jae;Lee, Kyung-Seok;Kim, Man-Soo
    • Special Issue of the Society of Naval Architects of Korea
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    • 2013.12a
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    • pp.1-7
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    • 2013
  • In past decades, a maximum standard vessel size for chemical tankers is not normally larger than 55,000 TDW due to the characteristic of chemical product shipment which is so variable but small quantity unlike single product carries such as crude oil tankers. These days, as demand of very large chemical tanker is rising due to the change of market trend of chemical product shipment, 75,000 TDW class chemical tanker has been developed. The newly developed vessel's structure has been designed based on CSR (Common Structural Rule) for double hull oil tankers (hereafter CSR) published by IACS (International Association of Classification Societies). However, due to the large difference from typical oil tankers, many items should be specially considered such as on deck transverse and corrugated bulkheads. In addition, two longitudinal bulkheads without upper stool have been constructed in order to maximise the number of cargo tanks and the volume of each cargo tanks. In this study, key word of the vessel has been briefly reviewed and the structural reliability of the proposed vessel has been investigated.

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A Study of the Examination of the Freeboard of a Chemical Tanker Considering Deck Wetness (갑판침수를 고려한 화학제품운반선 건현 검토에 관한 연구)

  • Park, Jong-Heon
    • Journal of Ocean Engineering and Technology
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    • v.24 no.2
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    • pp.41-46
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    • 2010
  • This paper deals with the problem of developing a new decision procedure for the freeboard of a coastal chemical tanker going on the coast. The decision procedure is mainly constructed with the algorithm of estimating statistically the time period that deck wetness will last on the deck of the ship. Deck wetness is one of the most important safety factors for sailing of a coaster. It generally means the situation in which the amplitude of the relative motion between the deck and the surface of the wave exceeds the freeboard. Therefore, in this paper, we proposed that the time during which the amplitude remains above the level of the freeboard should be appraised on the basis of statistical theory. A series of numerical calculations were executed for four different coastal chemical tankers (199G/T Type II, III & 499G/T Type II, III). It was demonstrated that the present decision procedure of freeboard is practical for planning the type of coaster sailing in the sea.

An Experimental Study on IMO 2nd Generation Stability Assessment in Dead Ship Condition of 13K Chemical Tanker (13K Chemical Tanker의 기관 제어 불능상태 IMO 2세대 안정성 평가에 관한 실험적 연구)

  • Lee, Sang-Beom;Moon, Byung-Young
    • Journal of the Society of Naval Architects of Korea
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    • v.59 no.2
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    • pp.89-95
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    • 2022
  • The stability of the existing ships has been evaluated through numerical calculations in the steady-state, but recently the IMO proposed a new stability assessment criteria that the stability is evaluated in the state in which environmental loads from such as waves and wind act like the loads under actual ship operating conditions. In this study, IMO 2nd generation stability assessment method and procedure were summarized for the dead ship condition, and Direct Stability Assessment (DSA) was performed on 13K chemical tanker through basin model test. The model test is performed in the ocean engineering basin to implement wave and wind loads, and environmental conditions for waves were set height and period of the incident wave, considering the regular wave and wind generation range reproducible in the ocean engineering basin. In addition, to consider the effect of wind speed, the Beaufort Scale for wind speed was applied in the model test.

A Study on the Insurance System for Oil Pollution Risk (유류오염 리스크와 보험담보의 문제)

  • Choi, Mi-Soo
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.41
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    • pp.185-202
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    • 2009
  • With the rapid development of oil and chemical industry in the late 20C, massive transportation of oil by oil tanker vessel has grown and it caused the big oil pollution accidents. When oil spill from the oil tanker, damages reach into the astronomical figures in economically and damages affect wide area and many people with break the balance of ecosystem. Recently in Korea, the oil pollution accidents has occurred frequently as growing of oil consumption and it caused large-scale damages to the victim. Oil pollution in Korea offshore takes not only Korean fisherman from their life ground and break the ecosystem but it takes too much time and money to recover. To minimize oil pollution damages, it is necessary to make pre-caution effort as a ship owner and relevant government bodies should endeavor to prevent from more damages. But once oil pollution accidents occurs in territorial sea, compensation for victim is very important. But it is true that compensation is not paid to victim smoothly. So this study aims at the problems of oil pollution compensation to the Korean victim and find the best way to get reasonable compensation.

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A Study on the Stability of a Low Freeboard Coastwise Tanker Capsized in Turning (2) - Experimental Examination of the Outward Heel Moment Induced by Flooding of Seawater onto the Deck - (선회중 전복한 저건현 내항 탱커의 복원성에 관한 연구 (2) - 갑판상 해수 침입이 경사 모멘트에 미치는 영향에 대한 실험적 조사 -)

  • 김철승;공길영;김순갑
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2002.03a
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    • pp.145-153
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    • 2002
  • A coastwise chemical tanker sailing at full speed has capsized in calm water and whole turing. In the precious paper, we investigated reasons of the accident by demonstrating the proper correction for the free surface effect of the liquid cargo and the bow-sinkage effect. In this paper, we also carry out model experiments of a transverse pressure under the seawater and an outward heel moment according to the heel angle and rudder angle, on the basis of radius of turning circle, ship's speed and drift angle of model ship occurring in turning. It is also shown that the flooding of seawater onto the deck occurring in turning generated a significant outward heel moment and the vertical distance between the center of gravity of the ship and the renter of lateral water drag.

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Maneuverability of a DWT 8,000-ton oil/chemical tanker by real sea trials - A comparison between the semi-balanced rudder and the flap rudder - (실선시험에 의한 DWT 8,000톤 선박의 조종성능 - Semi-balanced rudder and flap rudder -)

  • An, Young-Su;Lee, Hyeong-Geun;Park, Byung-Soo;Jang, Choong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.2
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    • pp.257-264
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    • 2015
  • This study is intended to provide navigator with specific information necessary to assist the avoidance of collision and the operation of ships to evaluate the maneuverability of dead weight tonnage 8,000 tons Oil/Chemical tanker. The actual maneuvering characteristics of ship can be adequately judged from the results of typical ship trials. Author carried out sea trials based full scale for turning test, Z" maneuvering test, man overboard rescue maneuver test, inertia stopping test. Consequently, $2^{st}$ Overshoot yaw angle of the semi balanced rudder and flap rudder in ${\pm}20^{\circ}$ zig-zag test showed $22.2^{\circ}$ and $18.0^{\circ}$, respectively. The maneuverability of the vessel was good in the flap rudder. The man overboard rescue maneuver maneuverability test was most favorable in the flap rudder and the full load condition. The results from tests could be compared directly with the standards of maneuverability of IMO and consequently the maneuvering qualities of the ship is full satisfied with its.