Cranemaster has built up a strong track record in the offshore renewables market over the last years. Installation of monopiles, jacket foundations, transition pieces and wave energy devices are some of the projects we have been involved in. Cranemaster® units are designed to protect both the crane and the equipment from shock loads and excessive forces. This is resulting in reduced downtime for the installation, increased operational weather window and reduced risk of damaging equipment and personnel.
Based on requests from key players in the industry, Cranemaster has developed special shock absorbers that will reduce snap loads during pile runs (pile drops) to acceptable levels. As a result, risk for personnel is significantly reduced and expensive interruptions or damage to equipment can be avoided.
Typical applications where Cranemaster® should be considered
- Lift-off from barges (feeding). Cranemaster® will reduce DAF and therefore increase the operational weather window.
- Splash zone crossing of large objects (monopile templates, mono buckets, jacket foundations with suction buckets). Cranemaster® will reduce DAF and reduce probability of slack slings.
- Installation of transition pieces (TP) on monopoles from floating vessels. Cranemaster® will increase ship stability and prevent rapid heeling.
- Pile runs or pile drops – protection of crane and rigging against snap loads during piling.
- Subsea landing and subsea re-positioning or recovery of heavy objects.
Protection of crane and rigging during pile hammering
Reducing risk in piling operations
Sudden free fall of the piles during pile hammering due to layering in the soil, so called pile runs, is an increasing concern in the industry. The snap loads following pile runs can be very high, exposing both personnel and equipment to high risk.
In cooperation with key players in the industry, Cranemaster has developed special shock absorbers that will reduce the snap loads to an acceptable level. As a result, risk is reduced, and expensive interruptions in the piling process can be avoided.
Pile run with and without Cranemaster®
This simulation shows a pile hammer, 300 ton weight in air. The hammer falls a distance of 0,8 meter and is then stopped by the crane wire.
• Snap load = 513T
• Ringing eliminated
• Snap load = 964T
• Significant ringing effect in crane and pile hammer
Examples of pile runs / pile drops
Increasing operability for splash zone crossing of large met masts
Cranemaster® units have been used for installation of large met masts in the North Sea. The structures had a height of 45 meters and weights of 300-400 ton.
Cranemaster performed calculations and lift simulations in close cooperation with the customer. Due to the large suction bucket, the splash zone crossing was a challenge with respect to dynamic forces and stability. Utilizing Cranemaster® units, these challenges were overcome, and the structures were successfully installed.
Cranemaster used for installation of transition pieces
Installation of transition pieces (TPs) from floating vessels can be challenging. With a Cranemaster® unit equipped with Lock & Release functionallity, vessel heeling is controlled, and snap loads are eliminated. Cranemaster® units with SWL of 250 ton were used during the Greater Gabbard project for this purpose as shown in the pictures below.