flng safe tandem offloading of lng in severe offshore
TRANSCRIPT
![Page 1: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/1.jpg)
FLNG Safe Tandem Offloading of LNG in Severe Offshore Environments
Allen Liu, Caspar Heyl, Arun Duggal & L. Terry BoatmanSOFEC, Inc.
FLNG 2009, Seoul, South Korea September 24, 2009
![Page 2: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/2.jpg)
Outline
• Why Tandem Offloading for FLNG systems?• Design Requirements• Development of the SOFEC Yoke Mooring System• Equipment on the FLNG Vessel & LNG Carrier• Marine Operations• Summary
![Page 3: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/3.jpg)
Offloading Oil from an F(P)SOTandem and Side-by-Side Gulf of Mexico
![Page 4: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/4.jpg)
Typical Offload Operation Criteria
• Tandem offloading using Nylon Hawser from FPSO to Tanker:– Maximum Connect Hs = 2.5m– Maximum Offload Hs = 3.5m
• Tandem Offloading using DP Shuttle Tankers– Maximum Connect Hs = 4.5m– Maximum Offload Hs = 5.5m
• Side-by-Side Offloading from FPSOs to Oil Tankers:– Maximum Connect Hs ~ 1.5 to 2m– Maximum Offload Hs ~ 2.0 to 2.5m
![Page 5: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/5.jpg)
Simulation Response in Hs 5.5m seas (Orcaflex™ )
![Page 6: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/6.jpg)
Design Requirements
• Offloading from Floating LNG (FLNG) Vessels
• High Safety and Reliability Requirements
• Use Field Proven Technology• Severe Operational
Environmental Conditions:– Offload in Hs = 5.5m seas– Connect mooring and LNG transfer
system in Hs = 4.5m– No additional support vessels
• Offload Frequency ~ 2 offloads / week
![Page 7: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/7.jpg)
LNG Tandem Offloading System Development
SOFEC Duplex Yoke
![Page 8: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/8.jpg)
Mooring System Equipment• Connection hardware on FLNG
– Mooring system– Mooring yoke [parked, floating,
and connected to LNGC]– Hawser winch, constant tension– Auxiliary winches– Lines– Yoke connector cone
• Connection hardware on LNG Carrier– Connection module– Hawser connector– Cone Connector assembly– Auxiliary deck winch
• LNG Transfer system options– FMC Loading Systems
pantograph pipe & swivels– Aerial cryogenic flexible hose
when proven & available
![Page 9: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/9.jpg)
Yoke in Parked Position
Two Winches 325mt capacity
Lift yokeEither will lift yoke
in emergency
Two Auxiliary Winches (225 mt)
Stabilize swayOn port & stbd side
Four part lines,Two part each winch
4” DyneemaSF=6
Hawser winch300 mt capacity
Render & Recover
![Page 10: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/10.jpg)
Arrangement of Yoke Mooring System
Yoke, 42m wide at links• Yoke system steel weights – Tank 600 mt– Yoke 400 mt– Links 200 mt– Total 1200 mt– Water Ballast
adds 1410 tons
![Page 11: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/11.jpg)
Yoke Tip Cone
Pivoting cone on two-axis gimbaled joint with internal vertical axis yaw bearing
![Page 12: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/12.jpg)
Mooring Hook-UpProcedure Summary
![Page 13: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/13.jpg)
Throw-line Zone for LNG Carrier Bow Position
Throw-line Gun PositionReq’d Range: 52m – 102 m
F.P. Position Zone
![Page 14: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/14.jpg)
Lines Required for Hook-Up
• Hawser (Winch on FLNG)– 5” diameter x 400 meters– Dyneema SK-75 HMPE– 975 metric ton MBS– Winch on FLNG
• Floating Pick-Up Line– 2” Polypropylene– 21 mt MBS
• Throw Line– Coiled in pneumatic throw gun– 3/16” Dyneema x 300m – 2.2 mt MBS
• Recovery Line (on LNGC)– 1” diameter x 400m– Dyneema SK-75 HMPE– 44.5 mt MBS– Winch on LNGC
Recovery Line Winch
2” x 40m Poly
5” x 400m HMPE
Hawser Winch
Spooling Drumfor Pick-up line
LNG Carrier
3/16” x 300m HMPE
1” x 400m HMPE
![Page 15: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/15.jpg)
Yoke in Parked PositionReady for LNGC Arrival in Area
Slacken Lines onTwo Auxiliary
WinchesPort & Stbd
Pick-up Line
Final inspection of yoke before connection
Throw line gun ready
Release Hook
![Page 16: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/16.jpg)
Yoke Connection Procedure Hawser pull continues
![Page 17: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/17.jpg)
Yoke Connection Procedure Yoke lifts out of water as hawser is retrieved to FLNG
![Page 18: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/18.jpg)
Yoke Connection Procedure Cone approaches receptacle
![Page 19: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/19.jpg)
Yoke Connection Procedure Yoke connected, propulsion stopped
LNG Pantograph Hook-up sequence begins
![Page 20: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/20.jpg)
Connection Simulation (Orcaflex™ )
![Page 21: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/21.jpg)
Yoke Connection Procedure LNG Pantograph connected & offloading
![Page 22: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/22.jpg)
Mooring Yoke DisconnectSummary
![Page 23: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/23.jpg)
Yoke Disconnection Procedure Pantograph retracted
![Page 24: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/24.jpg)
Yoke Disconnection Connection Procedure LNGC begins thrust astern to back away
Cone Connector releases, Yoke lowers on Hawser
![Page 25: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/25.jpg)
Yoke Disconnection Procedure Hawser retrieved back to LNGC
Hawser End Fitting returns to Cone tip
Floating Pick-up Line
LNGC Departs
![Page 26: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/26.jpg)
Yoke Disconnect Procedure Yoke in Parked Position, Ready for next LNGC Arrival
Unless required by weather, leave snubbing lines slack on Auxiliary
WinchesPort & Stbd
Inspect Yoke after disconnection
Inspect Pick-up Line
Throw line gun made ready
![Page 27: FLNG Safe Tandem Offloading of LNG in Severe Offshore](https://reader037.vdocuments.net/reader037/viewer/2022103010/58667cf61a28ab01408b51e7/html5/thumbnails/27.jpg)
Summary & Conclusions
• Robust tandem mooring system developed for FLNG Offloading in severe environments
• Can be used with existing LNG Transfer Systems• Also suitable for use with cryogenic hoses (under
qualification / not yet field proven)• System has been technically qualified by major
oil companies for mooring & LNG transfer• Marine procedures have been accepted by major
oil company mooring and marine operations officials