Operations
Weather-Window Extension
Raising the sea state your lift can work in — so fewer days are lost waiting on weather, and each window does more.
Every offshore lift carries an operational sea-state limit: above a given significant wave height, vessel heave drives dynamic loads past the crane and rigging margins and work stops. Heave compensation breaks that link. By decoupling the payload from crane-tip motion, Norwegian Dynamics compensators cut the dynamic amplification that sets the limit, so the same lift can stay inside its load envelope at a higher Hs, subject to sizing and analysis. The result is a wider operating window — more workable days across a campaign, more tolerance for forecast uncertainty, and a de-risked path to completing the scope in a single mobilisation.
What we control
Vessel heave at the hook
Wave-driven vessel motion transfers straight to the payload and sets the sea-state cut-off. RIGEL passive heave compensation absorbs it on routine lifts; CYGNUS carries the same principle to heavy subsea loads at lighter weight than RIGEL allows.
Presetting the window for a campaign
When the operating range must be as wide as possible, ANTARES adaptive passive compensation lets the gas-spring and damping be tuned to the payload and expected sea state, holding the response flat across the band rather than at a single design point.
Active control where passive falls short
For cases where passive or adaptive passive response is not enough, VEGA adds active stroke control with feedback to hold the payload against motion the window would otherwise rule out. (In development.)
Sizing the window honestly
The achievable Hs gain is set by how much the compensator reduces dynamic amplification for your payload, rigging and sea state — sized to DNV-RP-N103 and checked against the crane's derated capacity, not assumed.
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.
Want to widen your operating window?
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.