Operations
Subsea Lifting
Controlling dynamic loads from the splash zone to the seabed — so subsea lifts stay inside the operating window and land safely the first time.
Subsea lifting exposes the payload to the harshest part of any offshore lift. Crossing the splash zone it meets wave slamming and snap-load risk; through the water column it carries added mass and drag; and at the hook it inherits the vessel’s heave. Norwegian Dynamics builds the heave compensation and shock absorption that keep these forces inside the crane and rigging limits — extending the weather window and de-risking the lift.
What we control
Splash-zone slamming & snap loads
As the payload enters the water, slamming and momentary wire slack can spike loads far above static weight. POLARIS caps a discrete slam or snap peak, while passive heave compensation steadies the cyclic heave load.
Drag & added mass through the column
Velocity-squared drag and entrained water mass add force as the payload descends. Passive and adaptive passive compensation is sized to the payload using DNV-RP-N103 coefficients.
Vessel heave at the hook
Wave-driven vessel motion transfers straight to the load. RIGEL, ANTARES and CYGNUS absorb it passively; VEGA adds active feedback where the case demands it.
Controlled landing
Touchdown on the seabed needs controlled speed to protect the structure and the payload. Compensation is tuned so the final approach stays within the landing-speed window.
Choose the right compensator
The engineering behind it
For the full method and worked examples, see the engineering guide — forces are sized to DNV-RP-N103 and checked against the crane’s derated capacity.
Have a subsea lift in mind?
Send SWL, stroke, sea state, payload and operation sequence. We’ll come back with a recommended compensator, an operating-window view and the next engineering step.