PS3-6
Transcript of PS3-6
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Shell Global Solutions
Chiksan Marine Loading Arms
Enhanced for Application
In Exposed Areas
C.A.C. Van der Valk & J.J.M. Vreeburg
Shell Global Solutions International B.V.
R. Le Devehat & J.C. Cartereau
FMC Technologies
LNG-14, Doha, Qatar, March 21-24, 2004
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Side-by-side Loading Is Preferred Option
- Least introduction
of new technologies
- Compatible with
mid-ship Manifolds
-Applied for LPG
- Benign metocean conditions required
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LPG Loading in Early 70s Loading of Crude Oil
Examples of Side-by-side Loading
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Study of Relative Motions Between Vessels
Relative motions
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Marine Loading Arm in Offshore Environment
Inertia forces on Loading Arm structure
Larger rotations of swivels and bearings
High flow rate in hydraulic system
Connecting operations under motions
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New Connecting Mechanism
LNG Carrier
Guide Cable
Acquisition Winch
Alignment Cone
Receiving Spool
Barge
Pulley
Constant Tension
Winch
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Semi-automated Connecting Procedure
- Connect cable using messenger line
- Command for tension on cable
- Command for crawling of QC/DC
- Command for reducing the tension in cable
(small tension is left to avoid slack conditions)
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Full Scale Testing of Loading Arm
Dynamic test
bench representing
the manifold on the
LNG CarrierMotion envelope:
4 m x 5 m
Manifold flange
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Testing of Connecting Operation
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Hydraulic QC/DC With Seal Protection
Protection Ring
Seal
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QC/DCERS
Rotation System
Box with
Acquisition Winch
Components of Connector Assembly
Guide Cable
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Cable Release After Emergency Disconnection
Barge BargeLNGC
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High Level of Safety
Less potential for human errors
- Minimum manual interference
(connecting of guide cable only)
- Control of only one hydraulic system
(command to acquisition winch)
- Automatic centering of flanges
(using alignment cones)
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Test Results
Insight into dynamic response of system
(oscillations and load fluctuations)
Functionality of newly added equipment,
mechanisms, and hydraulic and electrical
control systems
Logic of methods and procedures
(operator handling and communications)
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Validation and Calibration
of a Numerical Design Tool
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Application of Numerical Design Tool
To analyze Loading Arms with different
sizes and weight distributions (inertia
effects) To analyze effects of different berth
positions and freeboard heights of LNG
Carriers
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Conclusions
The Chiksan Marine Loading Arm has beensuccessfully enhanced with a mechanism for
connecting under severe dynamic conditions
The new connecting procedure provides lesspotential for human error
The new system opens opportunities for offshore
LNG production and regasification units,
exposed jetties, and avoidance of breakwaters.