Turret Design and Operational Integrity
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1 OFFSHORE ENERGY Turret Design and Operational Integrity Andrew Newport, Technology Director, SBM Offshore
2 Turret Design and Operational Integrity Overview of turret mooring systems Design and Operational integrity Overview of the Stones turret mooring
3 Weathervaning systems
4 Turret System Components
5 Internal versus External
6 Permanent versus Disconnectable
7 16 floating units in the fleet USA Brazil Equatorial Guinea Angola Asia
8 Turnkey turrets
9 Turret Design and Operational Integrity Overview of turret mooring systems Design and Operational integrity Mooring legs and Out of Plane (OPB) bending Weathervaning system Swivels Overview of the Stones turret mooring
10 Mooring legs
11 Traditional chain connectors
12 Anchor Leg Configuration
13 Out of Plane Bending Fatigue T M A Interlink angle a int M B MA=-MB+Tsin( a total - a int )*4d 4d T a total Tension Angle Out of Plane Bending (OPB) fatigue was first identified in 2002 (Girasol Deep Water Buoy)
14 OPB Guidance OTC MS Chain Out of Plane Bending (OPB) Joint Industry Project (JIP) Summary and Main Results Lucile Rampi, SBM Offshore, Fata Dewi, SBM Offshore, Pedro Vargas, Chevron OMAE Chain Out of Plane Bending (OPB) Joint Industry Project (JIP) Static Test Program and OPB Interlink Stiffness Lucile Rampi, SBM Offshore, Fata Dewi, SBM Offshore, Michel Francois, Bureau Veritas, Arnaud Gerthoffert, Bureau Veritas, Pedro Vargas, Chevron Energy Technology Co. OMAE Chain Out of Plane Bending (OPB) Joint Industry Project (JIP) FEA Results and Multiaxiality Study Results Lucile Rampi, SBM Offshore, Andre Bignonnet, Ab Consulting, Cedric Le Cunff, Principia, Francois Bourgin, Principia, Pedro Vargas, Chevron Energy Technology Co OMAE Chain Out of Plane Bending (OPB) Joint Industry Project (JIP) Fatigue Test Program Result and Methodology Lucile Rampi, SBM Offshore, Arnaud Gerthoffert, Bureau Veritas, Michel Francois, Bureau Veritas, Andre Bignonnet, Ab Consulting, Pedro Vargas, Chevron Energy Technology Co
15 Double articulated chain connector Roll Body Pitch Body Hawse Pipe Chain Long hawse pipe and low friction bushes ensures the connector rotates before the chain links bend significantly
16 Articulated Rod Connecting Arm (ARCA)
17 Technology Readiness Level
18 Turret Design and Operational Integrity Overview of turret mooring systems Design and Operational integrity Mooring legs and Out of Plane (OPB) bending Weathervaning system Swivels Overview of the Stones turret mooring
19 Load transfer between fixed turret and rotating vessel Single forged 3 race roller bearings are limited to approximate 10m diameter. This limits load capacity and riser count
20 Segmental Bearings Segmental bearings can be used on top mounted turrets and external turrets Available in diameters up to 21m, but with limited offshore experience
21 3 race roller bearings are used in all main turret configurations External BMIT TMIT
22 Loads on the bearing Mooring and riser loads Inertia of the turret system Vessel deformations Bearing companion structure deformations
23 Loads on the bearing Mooring loads, riser loads and inertia loads are all directly imposed on the bearing system
24 Hull hogging and sagging ovalizes the deck around the moonpool
25 Isolated from vessel deformations to avoid additional loads on rollers
26 Companion structure deformations must be limited Bearing support structure (Rotating part) Bearing Outer ring Inner & Outer bolts Rollers Inner ring Seals arrangements
27 Regular slamming loads on the bearing should be avoided
28 Bogie bearings provide a high capacity alternative to roller bearings Virtually no limit on riser number Virtually no limit on mooring loads Bogies and radial wheels are standard components Bogies and radial wheels are inspectable and replaceable
29 The bogie bearing system incorporates bogies and radial wheels TO TOPSIDE GANTRY BOGIES RADIAL WHEELS DECOUPLING BOGIE SUPPORT STRUCTURE Sea level
30 Lowering the turret cyclinder through the moonpool Bogies support axial loads Radial wheels support radial loads The bogie design is standard, and the number used is selected to accommodate the design loads (N+1) Dry access in turret for inspection and maintenance
31 The system provides dry access for inspection and maintenance
32 Stoppers gives a massive increase in load capacity for extreme events Gap only closed during extreme loads Lower stoppers then provide additional load path Lower stoppers limit uplift on the bogies SCHIEHALLION Mooring force ~ 2000T SKARV, PRELUDE, ICHTYS Mooring force > 5000T
33 Turret Design and Operational Integrity Overview of turret mooring systems Design and Operational integrity Mooring legs and Out of Plane (OPB) bending Weathervaning system Swivels Overview of the Stones turret mooring
34 Swivels transfer fluids, utilities, power and signals
35 A range of swivel types are required Fluid Swivels for oil, water and gas (Pipe Swivels) Fluid Swivels for oil, water and gas (Toroidal Swivels) Utility Swivels for transfer of chemicals, hydraulics, air/gas, firewater and vents) Electrical and Optical Swivels for the transfer of power and signals / information
36 Swivels are assembled into swivel stacks
37 Torodial fluid swivels are the principal component of most swivel stacks
38 Sealing concepts are fundamental to swivel design Isolation & primary seals form the Oil Barrier cavity The Oil Barrier is maintained at a higher pressure than the process fluid Secondary seals are used to back-up primary seals, and permit leak monitoring
39 Seal replacement method should minimize disruption to production SBM s approach is to preinstalled spare seals Seals can also be replaced in-situ using seal welding technology No impact on adjacent swivels Tools to aid seal changeout are provided with the swivel stack
40 Seals can be replaced in-situ
41 Turret Design and Operational Integrity Overview of turret mooring systems Design and Operational integrity Overview of the Stones turret mooring
42 The Stones fieldis located 200 miles (320 km) south of New Orleans
43 FPSO Turritella is an Suezmax conversion with 7000 t topsides
44 The novelty was concentrated in the turret mooring system Remains connected in winter storms Disconnectable to avoid hurricanes Installed in 2,900m water depth Buoy supports steel lazy wave risers (SLWR) 6000 t displacement buoy Buoy is a hybrid construction of steel and syntactic foam Heave compensation system provided to pull in the buoy Distributed locking system to connect and disconnect the buoy
45 Syntactic foam used to counter high water pressure on the buoy
46 A trial fit of the lower turret and buoy was carried out in the fabrication yard
47 A distributed locking system connects the buoy to the turret
48 A generic prototype was developed to reach TRL 4
49 The locking devices were installed in the lower turret prior to integration
50 Successful dynamic drop test of the buoy
51 Installation of the bogie bearing support
52 The first application of steel risers on a disconnectable mooring system
53 Summary Operational integrity is highly dependent upon the system design, particularly at component level Out of Plane (OPB) bending fatigue is now recognized and well understood, and chain connector design must account for this phenomenon Bearing design must account for all external loads, including future loads and the effects of the riser installation program. The bearing companion structure should be stiff enough to avoid excessive deflections of the bearing, and should isolate the bearing from deck strains A distributed bearing system such as a bogie bearing allows redundancy in design, and the ability to change out components offshore In the event of damage to a seal, quick seal change-out with minimum disruption to production is paramount
54 Thank you for your attention Andrew Newport Technology Director SBM Offshore
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