Heave compensation and shock absorption for offshore lifting.
Six product lines cover passive, adaptive and active heave compensation, crane shock absorption and riser tensioning — every unit sized from first principles and screened in CONSTELLATION before it ships.
Screened in CONSTELLATION to DNV-RP-N103
Start with the lift, not the catalogue.
The control level rises across the family — from manually set passive units to full active feedback. Start with your operating case; the simplest suitable product is usually the right starting point.
Basic passive heave compensator
The compact passive choice for splash-zone crossings and simple subsea lifts — manual damping, set on deck, DNV Type Approval in progress.
Passive heave compensator
Wide-range passive control for heavy, deep subsea lifts beyond the RIGEL range — self-centering spring, manual damping, rated to 3,000 m.
Adaptive passive heave compensator
Automatic damping control and quick lift for complicated, multi-step subsea lifts — the unit adapts through the phases of the operation.
Lightweight crane shock absorber
Topside overload protection for falling-object loads such as a piling hammer — the whole function in a single cylinder, no accumulators, no needle valves.
Active heave compensator
MRU-driven active cylinder control with automatic damping, powered by a large onboard battery — no umbilical, no external power. VEGA-T topside first; VEGA-S subsea.
Riser tensioner
Backup riser tensioning and controlled compensation for drilling and workover duties — long-stroke, topside, selected from the operating window and required tension.
Lift screening & operability
Our in-house time-domain lift simulator — the whole operation modelled deck to seabed and screened across every sea state to DNV-RP-N103. Every unit above is sized with it.
Custom Hydraulic Equipment
Cylinders, telescopic units, rams, intensifiers, accumulators, valve blocks and HPUs — designed, built and tested to your specification for offshore and subsea service. Duplicates of existing units welcome.
The 2026 product brochure.
The whole constellation in ten pages — verified SWL and stroke ranges, entry prices, the application matrix, photos of delivered hardware and worked CONSTELLATION screening results. English and Chinese editions — the download links appear right here after one short form.
The product family, compared
| Compare | RIGEL | CYGNUS | ANTARES | VEGA | POLARIS | SIRIUS |
|---|---|---|---|---|---|---|
| Type | Basic PHC | Passive heave compensator | Adaptive PHC | Active HC | Shock absorber | Riser tensioner |
| Best fit | Simple splash-zone crossings and compact PHC | Passive lifts across the widest SWL range | Complicated, multi-step subsea lifts | Topside or subsea active motion compensation | Crane shock absorption and overload protection | Backup riser tensioning |
| SWL | 55–1,000 t | 12.5–10,000 t | 30–4,000 t | 75–2,500 t | 75–4,000 t | 350 / 500 t |
| Stroke | 1.0–6.0 m | 1.0–6.0 m | 2.5–8.0 m | 2.5–6.0 m | 1.0–8.0 m | 3.0–12.0 m |
| Control | Manual damping | Manual damping, self-centering spring | Automatic damping, self-centering spring, quick lift | Automatic damping, active cylinder control, self-centering spring | Manual damping | Manual damping |
| Form factor | Subsea | Subsea | Subsea | Topside / subsea | Topside | Topside |
| Budget from | USD 35,000 | USD 15,000 | USD 100,000 | In development | USD 20,000 | In development |
Engineering review depends on sea state, wave period, payload, water depth and operation sequence. Budget figures are entry points for the smallest configurations — final pricing follows capacity, stroke and classification.
Open the full selection guide →
Every unit is sized in CONSTELLATION.
Send the lift data and operation sequence — we model the whole operation deck to seabed, screen it across every sea state, and return your operating window, the governing limit and the recommended configuration.