Jacket Pile Grippers
DESIGN
- Sizeable to any pile diameter
- Balanced design in number of cylinders versus gripping capacity
- Ring height sufficient to limit heat affected zone close to cylinder fittings and hydraulics during installation (welding) at yard
- Compliant to standards and 3rd party Design Approval (DAD)
FEATURES
Tailored to jacket design and offshore installation methodology, allowing for
- Clearance for hammer and drilling equipment
- The installation (and clearance) of levelling equipment
- The placement of the grout
OPERATION
- Hydraulically operated with fail-safe
- Operation redundancy – from surface and/or ROV-panel
- Ability to re-grip by dual-acting cylinders
INSTALLATION
- FAT and packed ready for shipment at fabrication site
- Transport can be arranged for
- Optional on-site installation support, commissioning and SAT
Examples / Proposals
HVDC-Platform Centre Manche
2GW-Platform TENNET/AMPRION
Project Input
Centre Manche
CASE – OFFSHORE SUBSTATION
Tailored to jacket design and offshore installation methodology, allowing for
- 6 legs
- 10 pile sleeves
- Jacket weight 5,250T excl. piles
- Pile diameter 2,438mm (96”)
- Pile sleeve diameter 2,890mm
GRIPPING SCENARIOS
| Scenario | Pile Grippers (#) | Max Horizontal / Force Fh,max (t) | Max. Vertical / Force Fv,max (t) |
| Pile gripper per pile sleeve | 10 | 242.64 | -993.96 |
| Pile gripper per leg | 6 | 298.43 | -1043.39 |
Design – Centre Manche
PILE GRIPPER – STRUCTURE
- Scenario one (1) gripper per leg (6 total)
- Eight (8) hydraulic jacks for sufficient clamping force
- No vertical adjustment capability
- Funnel and sleeves are not part of scope
- Grippers to be installed (welded) upon jacket at yard
- Ring height sufficient to limit heat affected zone during installation (welding) close to hydraulics and fitting of jacks
DESIGN ALLOWS FOR:
- Clearance for hammer and drilling equipment so underwater cutting of piles is avoided later
- The installation (and clearance) of levelling equipment
- The placement of the grout.
Operation – Centre Manche
PILE GRIPPER – HYDRAULICS
- Double acting cylinders
- Rigid piping installed on gripper ring to feed jacks
PILE GRIPPER – OPERATION
- Base case is one (1) ROV-panel and hot stab per gripper
- Connecting frame on ring to bolt on ROV-Panel
- Standard operating pressure of 250 bar is assumed
- Stab and receptacle have Ø35 hydraulic bores, when used on 8 jacking cylinders act gradually
- Control from surface is optional
EPC Bid – Centre Manche
DETAILS
- 2.438 mm Hydraulic pile gripper
- S355J2 steel
- 8* Ø250 mm * 200mm stroke double-acting hydraulic cylinders
- Hydraulic piping for connections between cylinders and ROV panel
- Necessary NAS 6 Biodegradable hydraulic oil BIOVESTA 46
- Surface treatment SA 21/2 Blasting + 150mm epoxy
- Assembly and factory test
- Load testing TBD with client
- Packaging
SERVICES
- On-site support for fitting and commissioning + SAT on day rate
- Class certification on a cost+15% basis
- Transport from fabrication site to construction yard on a cost+15%
Project Input
2GW Platform
CASE – 2GW OFFSHORE SUBSTATION
- Five (5) platforms
- Eight (8) Jacket Pile Grippers per jacket
- Each Jacket Pile Gripper has 1,500T gripping capacity
- Jacket weight 12,850T excl. piles
- Pile diameter OD 2,743mm
- Pile sleeve diameter & thickness 3,125x50mm
Design – 2GW Platform
PILE GRIPPER – STRUCTURE
- Eight (8) Jacket Pile Grippers per jacket
- Eight (8) hydraulic jacks for sufficient clamping force (8*1,500T)
- No vertical adjustment capability
- Funnel and sleeves are not part of scope
- Grippers to be installed (welded) upon jacket at yard
- Ring height sufficient to limit heat affected zone during installation (welding) close to hydraulics and fitting of jacks
DESIGN ALLOWS FOR:
- Clearance for hammer and drilling equipment so underwater cutting of piles is avoided later
- The installation (and clearance) of levelling equipment,
- The placement of the grout
Operation – 2GW Platform
PILE GRIPPER – HYDRAULICS
- Double acting cylinders
- Rigid piping installed on gripper ring to feed jacks
PILE GRIPPER – OPERATION
- Base case is one (1) ROV-panel and hot stab per gripper
- Connecting frame on ring to bolt on ROV-Panel
- Standard operating pressure of 250 bar is assumed
- Stab and receptacle have Ø35 hydraulic bores, when used on 8 jacking cylinders act gradually
- Control from surface is optional
EPC Bid – 2GW Platform
DETAILS
- 3,125 mm Hydraulic Jacket Pile Gripper
- Design / 3 modelling / 2d drawings / FEM and DNV Design Approval
- IOM Manuals and MRB package
- S420 steel
- 8* double-acting hydraulic cylinders
- ROV-Panel
- Hydraulic piping for connections between cylinders and ROV panel
- Rotating hoist rings + Bolts and washers
- Necessary NAS 6 Biodegradable hydraulic oil BIOVESTA 46
- Surface treatment and Sigmacover380 DFT=125μm+Sigmacover456 DFT=125μm (colour TBD)
- Assembly and factory test
SERVICES
- On-site support for fitting and commissioning + SAT against cost+15%
- Transport from fabrication site to construction yard against cost+15%
- Batched transport possible 5*8 dependent delivery schedule
- Load-test and number of tests (test interval) TBD
