"Ship To Ship Lng Transfer Technology"
Ship to Ship LNG Transfer Technology Excelsior Class EBRV 138,000 m3 2 LNG STS Transfer Double Banked at Anchor 3 LNG STS Configurations LNG transferred across dock from LNG Carrier LNG transferred from LNG Carrier to EBRV down the dock Gas Delivered from EBRV to facility via HP Gas Arm Gas Delivered from EBRV to facility via HP Gas Arm LNG Gas LNG Gas LNG Transferred via Ship to Ship Transfer Gas Delivered from EBRV to facility via HP Gas Arm LNG Gas 4 LNG Lightering 5 Double-Banked at Bahia Blanca 6 Bahía Blanca GasPort (Argentina) • Dockside LNG regasification Utilizes ship-to-ship LNG transfer with continuous natural gas send out Gas offloading arm Capable of 400 mmscfd throughput (closed-loop mode) Provides seasonal service Bahía Blanca GasPort during Argentine winter • Short development time and low cost Final investment decision to in- service in less than 6 months Fixed facilities cost <5% of a land-based LNG terminal • Project partners are YPF and Repsol-Gas Natural Excelsior docked at the Bahía Blanca GasPort 7 LNG STS Transfer Risk Management LNG means Let’s Not Guess 8 LNG STS Transfer Partners / Development Basis • Developed with partners Exmar NV / Exmar Offshore USA Skaugen PetroTrans • STS Operation must meet applicable standards IMO - Gas code Class approvals by BV for LNG-RV’s, focus unrestricted liquid levels / all shipboard systems. IACS rules for LNGC: - Liquid level restrictions due to sloshing loads OCIMF / SIGTTO ○ Ship to Ship Transfer Guide (Liquefied Gases) Second Edition / Draft LNG STS Transfer Guidelines ○ SIGTTO LNG specific STS Transfer Considerations USCG: 33 CFR 156 Subpart B and C EN 1474 - 2 standards for cryogenic transfer systems 9 LNG STS Transfer Initial Engineering & Feasibility • By BUREAU VERITAS Target: assess measurable operational criteria to avoid sloshing damage in LNG-C due to any level of partial filling during LNG transfer Conclusion: LNG-C maximum roll angle 2° ; keep heading +/-30° into direction of significant waves Hs < 2.0 m • BY GTT Target: determine the maximum LNG transfer flow rate compatible with the treatment capacity of the increased Boil-Off Gas (BOG) Conclusion: Up to 6,000 m3/h with 60 mbar cargo tank pressure difference between LNG-RV and LNG-C • HAZID / HAZOP : Original STS design Lloyds Register / BMT 10 LNG STS Transfer Risk Based Assessments • Computer Motion Simulation Exmar Offshore / Yokohama Rubber Co. Ltd. • Maneuvering Simulations Ship Maneuvering Simulator Training Center – Trondheim / Antwerp Maritime Academy / Lloyds Register / South Tyneside Technical College / SIPORT – Madrid • STS Operations Plan Skaugen PetroTrans • Dynamic Mooring Analysis Tension Technologies International • Operation Manuals for rigging STS equipment Developed based on extensive practical tests on board • HAZID / HAZOP : final review Including operation manuals, training and procedures (Lloyds Register) 11 LNG STS Transfer Manifold Configuration 3 liquid lines 6 hoses Blank flange 1 vapour line 2 hoses Feeder ship LNGRV Spool pieces Saddles Flexible hoses Dry-Break ERC Water curtain & bath 12 LNG STS Transfer Gear General Arrangement 13 LNG STS Transfer Equipment Class Approvals • Reducing ‘Y’ Spool Pieces Class approval (BV) • Emergency Release Couplings Type approval (BV) • LNG Cargo Transfer Hoses Type approval (DNV) • Manifold platform structural verification Class approval (BV) • Hose Support Saddle verification Class approval (BV) 14 LNG STS Transfer Cargo Transfer Hose • Stainless Steel End Fittings • Epoxy Filled & Swaged • Standard ANSI 8” Flange •Type Approved by Class for STS Transfer of LNG •EN 1474 Compliant 15 LNG STS Transfer Cargo Transfer Hose • 57 Layers of Polyethylene • Film and Fabric • Inner / Outer Stainless Mandrel • Electrically Continuous • Failure Mode • Leak before fail • 400,000 Cryogenic Cycles • Comprehensive testing by TNO • Flow tests at Nikisso w/ up to 1500 m3/hr 16 LNG STS Transfer Cargo Transfer Hose • Composite Hose • 8” Diameter • 15 m Length • 0.65 m Min. Bend Radius • 300 Liter Volume per Hose • DNV Type Approved • Fit for Purpose • Light and Flexible 17 LNG STS Transfer Cargo Hose Storage • Hose Storage on EBRV • Test Blinds on Hose Ends • Internal Nitrogen Blanket • Test, Inspection, Records 18 LNG STS Transfer Cryogenic Hose Impact Test • 224 kg x 1.5 m •3 bar LN2 •No Leakage 19 LNG STS Transfer Sudden Impact! 20 LNG STS Transfer Cryogenic Hose Impact Test 21 LNG STS Transfer Cryogenic Hose Crush Test •200 mm Crush Plate •270 kN Load @ 3 bar LN2 •106 bar Pressure Test •Severe Leakage – No Burst 22 LNG STS Transfer Cryogenic Hose Crush Test 23 LNG STS Transfer Cryogenic Hose Pressure Test 24 LNG STS Transfer Cryogenic Hose Integrity • 50% Damage of Outer SUS Wire • 6 bar – No Leakage • 34 bar – Burst Pressure – No Jetting 25 LNG STS Transfer Cryogenic Hose Cycling • 400,000 Cycles • 2 Meter Stroke • Certified by TNO 26 LNG STS Transfer Hose Support Saddle • One per Hose Pair – Total Four Saddles on Each Vessel • Provides Protection and Support in Way of Hand Rails • Maintains Adequate Bend Radius of Hose • Transfer Loads from Hoses to Manifold Deck • Chafe Protection for Hoses • 8 mm Marine Aluminum • FMEA on saddle 27 LNG STS Transfer Hose Support Saddle 28 LNG STS Transfer Reducing Wye Spool Pieces • 16 “ x 12” x 8” (2) • Standard ANSI 150# Flanges • BV Class Approved • Handled by Crane Horizontally 29 LNG STS Transfer Specific Controls and Safety • Emergency Shut Down (ESD) Pneumatic ESD systems connecting LNGC with EBRV Electric and / or Fiber Optic umbilical available • Additional Water Curtain System at both manifold areas Protect ships’ trunk deck / cargo tank covers from accidental LNG release Includes ‘water bath’ on main deck under manifold area 30 LNG STS Transfer Water Curtains & Bath • Additional water curtain rigged under each manifold • Water bath installed on deck under manifold using dams 31 LNG STS Transfer Emergency Release Couplings Emergency Release Couplings (ERC) KLAW quick release couplings => quick disconnect of hoses in emergency situations Remote operation ‘Dry Break’ Extensive test in cryogenic conditions for STS type approval Actuator reinforced for cryogenic operations 32 LNG STS Transfer ‘Dry-Break’ Emergency Release Coupling 33 LNG STS Transfer Emergency Release Coupling • BV Class Approved • Function Tested w/ 1” ‘Hard’ Ice • Liquid Nitrogen @ 10 bar 34 LNG STS Transfer ERC Actuated 0.8 Liter Volume Between The Disks 35 LNG STS Transfer Hose Brake System 36 LNG STS Transfer Equipment, Controls and Safety • Emergency Shut Down (ESD) Pneumatic ESD systems connecting LNGC with EBRV Electric and Fiber Optic umbilical available • Additional Water Curtain System at both manifold areas Protect ships’ trunk deck / cargo tank covers from accidental LNG release Includes ‘water bath’ on main deck under manifold area • Emergency Release Couplings KLAW quick release couplings offer quick disconnect of hoses in emergency situations Remote operation ‘Dry Break’ 37 LNG STS Transfer Fender Arrangement 38 LNG STS Transfer Approach Maneuver 39 LNG STS Transfer Coming Alongside 40 LNG STS TRANSFER Mooring Operation 41 LNG STS Transfer Cargo Hoses Rigged 42 LNG STS Transfer Gear Placement 43 LNG STS Transfer Hose Connection 44 LNG STS Transfer Line Cooldown 45 LNG STS Transfer Projected Time Line • Rigging Fenders 1 hr • Approach Maneuver 1 hr • Mooring 2 hrs • Pre-Transfer Meeting / Gauging 1 hr • Connect Hoses 2 hrs • Line Cooldown 1-½ hr • ESD / ERC Tests ½ hr • Cargo Transfer (130,000 m3 @ 5000 m3/hr) 26 hrs • Hose Drain / Purge / Disconnect 4 hrs • Unmooring / Vessel Separation 1 hr • Fender Recovery 1 hr Total Projected Time 41 hrs 46 1st Commercial STS Transfer Scapa Flow – 8-9 February 2007 47 LNG STS Transfer Site Specific Assessments • Simulator training with Scapa Flow Pilots and EBRV senior staff at South Shields Technical College (UK) • Ballast Water Management issues regarding environmental preservation • Waterway management risk assesment with Orkney Harbor Authority, Scotish National Heritage and BMT-Isis • Simulator training with Bahia Blanca Pilots and EBRV senior staff at SiPort • Risk assessment of non-standard conditions prior to STS operation Primarily for weather considerations and forecasted conditions 48 LNG STS Transfer Full Rate Cargo Transfer (5,950 m3/hr) 49 LNG STS Transfer Routine Inspections 50 LNG STS Transfer Drain & Purge Hoses 51 LNG STS Transfer CTMS EXCALIBUR EXCELSIOR Opening Volume (m3) 132,379 1,197 Volume Transferred (m3) 132,296 131,830 Closing Volume (m3) 83 133,027 BOG Consumed (m3) 215 273 52 LNG STS Transfer Statistics 53 LNG STS Transfer 54