INCREASED OPERATIONAL WEATHER WINDOW
Cranemaster units are designed to protect both the crane and the equipment from shock loads and excessive forces. For lifting operations offshore the result is an increased operational weather window, reduced waiting time, and increased utilization of valuable assets.
- Increase offshore crane lifting capacity
- Reduce DAF in offshore lifts
- Increase weather window for splash-zone crossing
- Remove possibility for resonance during subsea lowering operations
- Reduce landing speed and motion for subsea installations
- Protect the crane/winch during subsea recovery and decommissioning operations
- Load tensioning for air or subsea installations
- Protect equipment or personell from shock loads
- Cranemaster used as load cell
- Cranemaster as flexible pipe tensioner
- Cranemaster used to avoid overload in tug winch
Please contact us for further information of special applications.
For the Neptune Deep Water Port Project (DWPP) APL made use of a 400T 4300mm stroke Cranemaster for lowering and installation of 16 suction anchors. The operation took place in Massachusetts bay at 80 meters depth. Due to the suction anchor’s hydrodynamic properties, a Cranemaster unit was required to reduce the dynamic loads in the splash zone.
Two SWL250T stroke 2500mm Cranemaster units in series were used by Technip USA for cross haul and landing of 167T weight piles, manifolds and pump stations. The structures were installed at 2700m water depth from the Deep Blue at Petrobras America Cascade and Chinook gas fields in the Gulf of Mexico. The Cranemaster units were used as a passive heave compensation system to reduce landing speed on the sea floor. Particular to this project, the Cranemaster units were deployed through the moon pool of the Deep Blue.
For the North Amethyst project in Canada, Technip and Jumbo made use of a 250T 2500mm stroke Cranemaster for the installation of a Module Suport Frame (MSF) at 120 meters water depth. The MSF had a dry weight of 139T and a submerged weight of 109T. Cranemaster was in this case mainly used to ensure a safe landing on the sea bed and avoid re-bouncing. Cranemaster also increased the operational weather window for lifting through the splash zone.
Subsea 7 successfully completed installation of protection covers in the Shetland waters. Analysis was done upfront by Cranemaster, giving Subsea 7 a weather window of significant wave heights up to 3.5m. Without use of Cranemaster, the operational window was significantly less. Cranemaster units were used both for splash zone crossing and landing speed reduction. For the latter, Cranemaster was used in combination with AHC on the vessel crane for added performance and protection.
Installation of 6 large structures was successfully conducted in the South China Sea. The dry weights of the structures were in the order of 200-400 tons. Due to the water depth of 1500m, potential risk of resonance had to be mitigated. By using two 400T Cranemaster units in parallel, the resonance frequency was shifted out of the operational weather window such that risk of resonance was not limiting the operational weather window for the operation. A swivel of 700T was used to avoid torsional forces in the parallel configuration. The successful completion was a result of joint analysis and cooperation between Cranemaster and the customer.
EXAMPLE OF SPECIAL APPLICATIONS
When lifting the loading buoy into the ships docking bay, the ships movement can give high peak loads on the lifting gear. To dampen and avoid these excessive loads, Cranemaster designed a special unit which is permanently installed in the top of the loading buoy as an overload protector. The Cranemaster unit will stroke as the load exceeds the preset pressure. This ensures a smooth and safe docking of the loading buoy. The units have now been in operations for many years, undergoing the required inspections and services required by certification authorities. Cranemaster units are installed in APL loading buoys on the Vincent and Reliance fields.
The vessel “Normand Seven” was chartered from Solstad Offshore ASA by Subsea 7 and converted into a subsea pipe laying vessel for a long-term contract in Brazilian waters. Subsea7 looked into ways to dynamically test the flexible pipe tensioner installed on the vessel and a standard Cranemaster rental unit available from stock was chosen as an affordable, convenient and safe solution for this operation.
A CM4-400T-4300-A Cranemaster was attached to the vessels’ stern and a wire was run from the Cranemaster to the a test pipe hold by the pipe tensioner. The pipe was then run out and in of the tensioner to test that it could work under max work load. To increase the load on the wire which was retained by the cable tensioner, the Nitrogen pressure in the Cranemaster was simply increased. If the cable tensioner should break down or the wire snap, the only thing that would happen was that the piston rod would safely return to zero stroke. When the load test was finished the Nitrogen pressure was released and the unit hooked of.
EXAMPLE OF CONTROL SYSTEMS
For a offshore wind farm project off the UK coast, Jumbo Offshore included Cranemaster for installation of transition pieces for offshore wind mills. To limit the lifting height above the ship deck, a custom made "lock and release" system was designed and included in the development of two new 400T 2500mm stroke units for this project.
Cranemaster was mainly used to reduce the crane wire tension and to ensure a safe landing of the transition pieces onto the piles offshore.
The Cranemaster Quick Lift System(QLS) was used in this project to avoid reentry (re-contact) when lifting a platform structure from a barge onto the platform. 2 x CM4-400T-4300-A Cranemasters was utilized.
List of selected projects
Below is a list of selected projects for the last years. Please contact us for more information.
- Shetland waters, crossing the splash zone and removing dynamic forces subsea for large protection covers
- PLR installation at medium water depth, Alseas' Audacia.
- Ikhwezi project, South Africa, installation of subsea structures
- Liwan, installation of large subsea structures, resonance avoidance
- Dogger bank, Installation of met-masts for windmills.
- Golf of Mexico, subsea structure installation, splash zone and reduction of landing speed.
- Costa Concordia removal project, installation of foundation.
- Project Installation of holdback anchor. Splash zone and passive heave.
- Bien Dong Vietnam. Deploying MWA in splash zone.
- Seminole Project. Installation of suction anchors. Splash zone.
- Mudmat installation. Splash zone.
- Goliat Development Project. Cover installation. Passive heave.
- Gumusut Kakap Project. Pile installation. Overload Protection.
- Fairfield Dunlin Gas. Recovery of clump weight. Overload Protection.
- Liuhua Project. Overload protection when opening hatches.
- Audacia A frame upgrade. Installation of suspension frame splash zone.
- SHWE Field Development. Installation of manifolds splash zone.
- Shell PWRI. Installation of cover. Passive heave Gorgon & Janz. Installation of PLET Foundation. Passive heave.
- Liuhua Project. Lowering structure through the splash zone.
- Noble Tamar. Installation of structure. Splash zone.
- Montara Pile Installation. Overload protection.
- Tordis Decommissioning. Move cover into wet storage area. Passive heave.
- Marulk. Move cover into wet storage area. Passive heave.
- Husky Frame. Retrieval and wet-tow FPSO bottom cover plate.
- Lagan Tormore. Lowering of structure through the splash zone.
- Shelly Decommissioning. Recovery of mattress baskets. Overload protection.
- Hibernia OLS Replacement. Recovering of Fast Frame. Overload protection.
- Angola Block 31. Lowering and installation of SPHU. Passive heave.
- Gjøa-Vega. Recovery of Pig Trap Hatches. Passive Heave.
- Jubilee Phase 2. Installation of different structures. Passive heave.
- West Delta Deep Well servicer. Landing of piping module. Passive heave.
- Barrow Island. Caisson Installation. Splash zone
- Retrieval of pipeline skid. Overload Protection.
- PhPc Taurt and Ha’py. Deployment of manifolds. Passive heave.
- Goliat template installation. Submerged wet tow.
- Gjøa-Vega. Recovery of hahtches. Passive Heave.
- Pazfloor. Installation of piles. Overload protection.
- Trym. Recovery of cover. Passive Heave.
- Devenick. Installation of structure. Passive heave
- PSVM BP Angola. Installation of suction piles. Splash zone
- Jubilee Phase 1. Installation of mudmats. Passive heave.
- Deployment of trenching vehicle. Passive heave
- Greater Gabbard. Installation of windmill structures. Overload Protection
- Jubilee Phase 1 Ghana. Installation of suction piles. Splash zone
- West Delta Deep Well servicer. Installation of TS Piping module Passive heave.
- Recover pipeline injection skid from seabed. Overload protection.
- Cascade Chinook. Rigid jumper installations. Passive heave
- Gjøa Tie In. Installation of covers. Splash zone.
- Versabar vessel Bottom Feeder. Installation of Securing Pins. Overload Protection.
- North Amethyst. Landing of structures. Passive heave
- Oyo Field Nigeria. Installation of suction piles. Splash zone.
- Murphy Thunderhawk. Installation of suction piles. Splash zone