The Way to Eco-Vessel: Reducing VOC from Hull Structural Aspects Hull Basic Design Team Samsung Heavy Industries.

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1 The Way to Eco-Vessel: Reducing VOC from Hull Structural Aspects Samsung Heavy Industries 1/23 Contents Introduction Structural design for KVOC system and hull integration Structural design for higher tank pressure application Installation and tank tests Conclusion remarks 2/23 1

2 Introduction What is VOC? VOC regulation Ho to control VOC? Overvie 3/23 What is VOC? VOC(Volatile Organic Compounds) A mixture of light end components (Methane to octane) NMVOC: Non Methane VOC (Ethane to octane) NMVOC + NOX Ground level ozone Detrimental effect on human health (eyes and lungs) and vegetation Source of VOC in Crude Oil Tankers Loading 4/23 2

3 VOC regulation MARPOL Annex VI Chapter III Reg. 16 Vapor emission control system is required. Res. MEPC. 176(58): VOC management plan is required since July 1, 2010 To provide ritten procedure for minimizing VOC emission To give consideration to the additional VOC generated by crude oil ashing Res. MEPC. 185(59): Guideline for VOC management plan North sea Recovery efficiency at least 78% is required by Noregian regulation. (Minimum requirement) 5/23 Ho to control VOC? VOC prevention method: reducing the generation of VOC KVOC VOCON Increased Tank Pressure Supplier Operation Knutsen OAS Shipping Loading Samsung Heavy Industries Yard VOC recovery method: re-collecting the occurred VOC Re-liquefaction Re-absorbtion Supplier Hamorthy APL GBA Marine Venturie Operation Loading, Loading, 6/23 3

4 Overvie Introducing a shuttle tanker of Samsung Heavy Industries Size: Aframax (109K) Operation area: North sea VOC control method KVOC application Higher tank pressure application Structural design of KVOC and hull integration Cargo tank boundaries and their supporting members ith higher tank pressure 7/23 Structural design of KVOC and hull integration KVOC Structural arrangements Fatigue calculation Reinforcement 8/23 4

5 KVOC General System developed by Knutsen OAS Shipping proven by extensive onboard test Significant reduction of VOC during loading up to 80% Principle Most of VOC is emitted during loading by flashing of dissolved gas due to vacuum in the drop line To prevent vacuum in the drop line, the line diameter is increased by about 2 times Also the crude oil loaded smoothly folloing the pipe all in order to prevent flash avoiding impact on the flo 9/23 Structural arrangement KVOC installed on main deck of mid cargo hold area idely open to major hull girder loads Upper deck level Trans. bulkhead KVOC KVOC Longi. bulkhead Inner bottom 10/23 5

6 Fatigue calculation Simplified approach as per DNV CN30.7 Check locations KVOC column penetration to main deck Butt connection of KVOC insert plate and main deck KVOC KVOC column penetration Butt connection 11/23 Fatigue calculation SCF for KVOC column penetration 12/23 6

7 Fatigue calculation SCF for butt connection 13/23 Fatigue calculation Results of fatigue calculation Sleeve thickness increase, 2mm 14/23 7

8 Structural design for higher tank pressure application Work scope Lo cycle fatigue Reinforcement 15/23 Work scope Resultant valve pressure increased up to 0.7 bar Objective Verification of tank boundaries and their supporting members ith higher tank pressure Folloing calculation updated; Local scantling for local and primary supporting members 3D cargo hold analysis Lo cycle fatigue analysis 16/23 8

9 W.T.BHD STR.2 (8420 A/B) 800 X R X R A/ B BASE LINE C B A X 6 LONGITUDINAL SPACING : 775 X OFF.C.L OFF.C.L X + R O. HD INNER BOTTOM BOTTOM SHELL Lo cycle fatigue Simplified approach as per DNV CN X ORDINARY SECTION 725 X X X X R2400 NO.1 STRINGER PLAN (14740 A/B) Toe 1620 * * * * * * Heel Heel Toe 17/23 Reinforcement Ordinary section Deck longi. stiffeners: Changed to T-bar ith size increase Inner longi. bhd.: Plate: 1~1.5 mm Longi. stiff.: AH32 AH36 Center longi. bhd.: Plate: 1.5~2.0 mm Longi. stiff.: Size increase and Mild AH32 Inner botom: Plate: 0.5~1.0 mm Longi. stiff.: AH32 AH36 18/23 9

10 Reinforcement Transverse members Plate: 0.5~1.0 mm V. stiff.: Mild AH32 Plate: 0.5~4.0 mm Face area: +45% V. stiff: Mild AH32 O. ulkhead Plate: 0.5~3.0 mm Face area: +40% Transverse ebs 19/23 Stringer Installation and test Installation Test 20/23 10

11 Installation Manufacturing Moving Lifting & Laying Fixing Setting Handling Welding 21/23 Test To verify the structural integrity ith 0.7 bar hydro static pressure, 7m height pipe is applied on deck. Tank test plan 22/23 Tank test 11

12 Conclusion remarks Summary VOC reducing methods ere successfully applied to Aframax shuttle tanker. Structural arrangement and fatigue assessment ere carried out for KVOC and hull integration. Tank boundaries and their supporting structures ere reinforced to ithstand higher tank pressure. Local scantling 3D cargo hold analysis Lo cycle fatigue calculation Tank test as performed to check the structural integrity of tank boundaries. Samsung Heavy Industries are expanding this successful experience to more crude oil tankers. This ould be a good example of eco-friendly vessel to comply ith the needs of eco-friendly operation orldide. 23/23 12

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