Operations
Reducing Dynamic Loads (DAF)
Cut the dynamic amplification factor on your lift, so the same crane and rigging work safely across a wider weather window.
On an offshore lift, wave-driven crane-tip motion turns a static payload into a moving load: tension spikes on the up-stroke, slack on the down-stroke, and the peak force can run well above the static weight. That ratio is the dynamic amplification factor (DAF), and it sets your crane derating, rigging margins and weather limit. Norwegian Dynamics compensators decouple the payload from crane-tip heave to bring the DAF down toward the project limit, while POLARIS caps transient shock peaks. The payoff is a wider operating window and a de-risked lift, designed to DNV-ST-0378 and DNV-RP-N103.
What we control
Decouple the payload from heave
RIGEL, our passive heave compensator, absorbs crane-tip motion in a single robust cylinder so the hook sees a steadier load — the default, cost-effective way to pull DAF down on routine lifts.
Preset the response to the lift
ANTARES is an adaptive passive compensator with tunable gas-spring and damping, so the DAF reduction can be set to the payload, sling length and forecast sea state before the lift rather than fixed by hardware.
Hold DAF down at large SWL
CYGNUS is a high-capacity passive compensator in a cross-accumulator configuration — lighter than RIGEL at large safe working loads, so heavy subsea lifts keep their dynamic margin without an outsized unit.
Cap the shock peak
POLARIS, a pilot-controlled crane shock absorber, limits the transient force from splash-zone slamming, pile-run or a snap load. It is a single-shock device and needs reset time between events — not for rapid repeated shocks.
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.
Tell us your sea state and payload — we'll size the compensator to keep DAF within your limit
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.