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1 17 th INTERNATIONAL CONFERENCE & EXHIBITION ON LIQUEFIED NATURAL GAS (LNG 17) 17 th INTERNATIONAL CONFERENCE & EXHIBITION ON LIQUEFIED NATURAL GAS (LNG 17) DESIGN OF THE EVOLUTIONARY LNG CARRIER SAYAENDO By <Title of Presentation> <Title of Presentation> Koichi Sato By: By: <Author Name>, <Organization> Mitsubishi Heavy Industries (MHI), Ltd. Japan <Date> & Henry Chung Lloyd s Register Group Limited (LR) Yokohama Design Support Office, Japan 18 April MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved.
2 INTRODUCTION 1. MHI has developed a next-generation spherical tank LNG carrier with a continuous tank cover, nicknamed SAYAENDO, meaning peas in a pod. 2. SAYAENDO has many advantages, such as lighter steel weight, improved fuel consumption, better terminal compatibility, better maintainability. 3. This presentation introduces the design of SAYAENDO and the state-of-the-art engineering verification methodologies applied MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 1
3 CONTENTS OF PRESENTATION 1. Design concept of SAYAENDO (comparison with conventional) 2. Technical key points 3. Advanced Structural Analysis 4. Application to 155 km 3 LNGC 5. Application to cold region 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 2
4 MHI SPHERICAL LNGC DESIGN HISTORY 1. Forty-two LNG carriers delivered since Epoch making 2 nd generation LNGC" with a lower BOR with a forcing vaporizer. 3. Continuous developement with 3 rd generation (137km 3 ) and 4 th generation (147km 3 ) 1st 4th 2nd 3rd 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 3
5 SAYAENDO vs CONVENTIONAL (1) Reduction of steel weight by 5-10%, for ship over 147 k-m 3 due to new structural concept. h 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 4
6 SAYAENDO vs CONVENTIONAL (2) Increase of height of tank cover Increase of steel weight of non hull girder member Increased steel weight of cover (increased steel weight of of non-hull non-strength girder member) Tank cover (non strength member) stretched Main hull (strength member) 125 k-m 3 LNGC 155 k-m 3 LNGC (with stretched tank) 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 5
7 OVERALL CONFIGRATION OF SAYAENDO 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 6
8 KEY POINTS IN DEVELOPMENT 1. Structural design and assessment Longitudinal strength assessment Detail connection design Tank cover and main hull connections including fore and aft ends Interaction between cargo tank and hull Fatigue assessment for structural detail 2. Aerodynamic assessment with wind-tunnel tests 3. Manoeuvrability simulation and mooring analysis 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 7
9 ADVANCED ANALYSIS BY MHI-DILAM (1) 1. Advanced structural analysis by MHI-DILAM carried out for yield, buckling and fatigue criteria. 2. Yield and buckling strength confirmed acceptable against maximum load in ship lifetime. Higher stress Lower stress 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 8
10 ADVANCED ANALYSIS BY MHI-DILAM (2) years of design fatigue life fit for world-wide LNG trading has been confirmed. 2. Reduced hull girder stress has favourable effect in SAYAENDO, allowing possibility of efficient structural design to achieve the given fatigue design specification MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 9
11 ADVANCED ANALYSIS BY MHI-DILAM (3) 1. Comparison of hull girder stress (Deck and Bottom) 2. Comparison of hull / tank interaction force Point-A Deck stress 100 Point-B Bottom stress Point-A Deck stress Upp. Dk. Tank connection skirt connection Point-C Tank stress by hull deflection Neutral axis 147km 3 LNGC Conventional moss type Upp. Dk. Point-B Bottom stress Tank connection skirt connection Point-C Tank stress by hull deflection Neutral axis 155km 3 LNGC SAYAENDO type [Point-A] Deck stress [Point-B] Bottom stress [Point-C] Tank stress by hull deflection 147 LNGC 155 SAYAENDO 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 10
12 THE 155k-m 3 SAYAENDO (1) Conventional 147 k-m 3 Sayaendo 155 k-m 3 Tank capacity Approx. 147,200 m 3 Approx. 155,300 m 3 Loa 288 m 288 m B (mld.) 49.0 m m D (mld.) 26.8 m 26.0 m (stretched) Speed Approx knot Approx knot Main Propulsion Plant Conventional steam turbine UST (Ultra steam turbine) 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 11
13 THE 155k-m 3 SAYAENDO (2) 1. MHI-UST (Ultra Steam Turbine plant), a new turbine plant 2. 25% reduction in fuel consumption compared with conventional ships 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 12
14 ICE BREAKING SAYAENDO 1. Independent tank system: tolerant to local ice impact 2. Overall hull girder strength: highly effective in resisting global ice impact loads MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 13
15 CONCLUSIONS 1. State-of-the-art engineering verification methodologies by the shipyard and the classification society were applied to validate the new design to meet the stringent technical, regulatory and safety requirements of the LNG shipping industry. 2. As a product, SAYAENDO has the following advantage. New structural concept offering more rigidity with less light weight. Compact design, especially in ship s depth. Lower maintenance cost, due to omission of flying passage. Suitability for navigation in cold region MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 14
16 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 15
17 Lloyd s Register: Marine Notable Aspects of Class Consideration Class notation for standard ship: 100A1 Liquefied Gas Carrier, Ship Type 2G, Methane (LNG) in independent spherical tanks type B, Maximum vapour pressure 0.25bar, Minimum temperature 163C, ShipRight(SDA, FDA plus(50,ww), CM, ACS(B)), *IWS, LI, LMC, UMS, ICC with the descriptive notes ShipRight(SCM, BWMP(T)), ETA. Structural Consideration focusing on the Tank Cover: (1) Tank Cover as a Protective Structure for the Cargo Tanks (2) Tank Cover as a Primary Hull Strength Member Design Verification using LR s ShipRight Procedures Safety of overall ship arrangement in respect of: (1) LNG cargo manifold system (2) Arrangement of the cargo machinery room 2012 Lloyd s Register Group Limited. All Rights Reserved. 16
18 Lloyd s Register: Marine Typical Fatigue Checking Locations on Tank Cover Opening iwo Cargo Tank Dome Knuckles iwo Cofferdam BHD Aft Scarphing Structure Upper and Lower Corners iwo Manifold Recess Forward Scarphing Structure Fine mesh hotspot stress Screening 2012 Lloyd s Register Group Limited. All Rights Reserved. 17
19 Lloyd s Register: Marine Typical LNG Trading Pattern for ShipRight(FDA) notation Trading Routes North Sea NE USA North Africa NE USA North Africa Gulf of Mexico North Africa N Europe Middle East NE Asia NW Australia NE Asia SE Asia NE Asia 2012 Lloyd s Register Group Limited. All Rights Reserved. 18
DESIGN OF THE EVOLUTIONARY LNG CARRIER SAYAENDO
DESIGN OF THE EVOLUTIONARY LNG CARRIER SAYAENDO Koichi Sato Mitsubishi Heavy Industries (MHI), Ltd. Japan Henry Chung Lloyd s Register Group Limited (LR) Yokohama Design Support Office, Japan KEYWORDS:
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