Barge Master has launched the BM – 001, its first operational motion compensation platform in December to provide stability and safety to offshore crane operations. The moving platform uses a drive and control system from Bosch Rexroth to neutralize the roll, pitch, and heave caused by waves and considerably expands the uses for standard floating cranes.
Crane stability has been a major challenge for offshore installation and decommissioning work because even small waves on the sea produce major movements for the tip of the crane, endangering the crew.
“Right now, standard floating cranes encounter difficulty with waves cresting at 30 centimeters. Safe crane operation can no longer be guaranteed,” said Barge Master Director Jan-Paul van den Bos. Working with Rexroth, Barge Master developed a comprehensive solution including all necessary drive and control components to compensate for movements in three degrees of freedom.
Special sensors deliver motion data to the controls which calculates how the platform must move to compensate for wave action. Three degrees of freedom (heave, roll, and pitch) are compensated by three hydraulic cylinders that attach the crane to the hull of the ship. By measuring the motions of the vessel, and controlling the motion of the actuators, the cylinders’ compensate for the waves.
The remaining degrees of freedom (surge, sway, and yaw) are compensated by dynamic positioning of the vessel or traditional mooring systems.
The launch of the Barge Master platform will let cranes weighing about 400 tons operate in swells up to five times greater than allowed by current systems. “With motion compensation we have expanded the application window for the floating cranes – handling waves of up to 150 cm,” says van den Bos.