AHC Articulate Boom Offshore Crane is a heavy‑duty subsea lifting solution built for harsh offshore operating conditions, integrating articulated knuckle boom structure and high‑performance Active Heave Compensation (AHC) main winch system. It delivers stable and precise underwater hoisting even under rough sea states, widely used for offshore construction, subsea installation, subsea equipment deployment, platform supply vessel, and offshore service vessel projects.
The core AHC‑60t main winch adopts multi‑hydraulic‑motor driven multi‑layer wire rope spooling system. Rated lifting capacity reaches 60t, matching wire rope diameter 60‑65 mm. The reel is equipped with LEBUS grooved sleeve for neat multi‑layer rope winding, supporting around 12‑layer winding. Effective working stroke is 1600 m, total rope storage capacity of multi‑layer reel is approx.1750 m.
Two sets of drive assemblies are arranged on both sides of reel body: each set contains 5 hydraulic motors + 5 built‑in planetary gearboxes + enclosed gear unit (driving pinion & large gear). In total: 10 hydraulic motors, 10 built‑in planetary gearboxes, 2 enclosed gearboxes and one complete LEBUS reel assembly.
A rope excluder is fitted at the rope‑in side to synchronously control the fleet angle less than 1.5°, preventing rope jumping and disorder winding. An angular encoder and travel limit switches are mounted on reel for real‑time measurement of wire rope linear speed and travelling distance. The whole winch unit is rigidly installed on the crane supporting platform.
Active Heave Compensation Working Principle
When the crane spreader operates in deep water, vessel rolling and pitching will bring violent vertical movement to suspended payload. The AHC system, consisting of hydraulic follow‑up system and nitrogen accumulator tank, counteracts vessel heave motion in real‑time.
Driven by signals from MRU (Motion Reference Unit), the hydraulic control subsystem commands hydraulic motors for forward and reverse rotation. The winch continuously pays‑out and pulls‑in wire rope dynamically, to keep loaded spreader nearly stationary at target deep‑water position with minimal vertical displacement. It greatly expands operable weather window for subsea lifting missions.
AHC Main Winch Mechanical Performance
- AHC/AT Load Range: 0‑60 t
- Heave Period: 10 sec
- Nominal Compensation Stroke: ±1.5 m
- Maximum Compensation Speed: 1 m/s
- Reference Sensor: MRU (Motion Reference Unit)
Main Specifications
| Parameter | 100t | 60t | 20t | 10t |
|---|---|---|---|---|
|
SWL (t) |
100 | 60 | 20 | 10 |
| Luffing Min/Max (m) | 5~10 | 5~12 | 5~27 | 5~25.37 |
| Hoist Height Above Deck / Under Deck (m) | 16 / 100 | 28 / 1600 | 28 / 800 | 28 / 8 |
| Hoisting Speed (m/min) | 0‑10 | 0‑20 | 0‑20 | 0‑20 |
| Luffing Time (s) | 0‑150 | ‑ | ‑ | ‑ |
| Slewing Speed (r/min) | 0‑0.5 | ‑ | ‑ | ‑ |
| Total Power Supply | 415V‑50Hz‑3ph | ‑ | ‑ | ‑ |
Key Features
✅ Integrated AHC active heave compensation system for deep‑sea subsea lifting
✅ Multi‑motor heavy‑duty winch with LEBUS reel, large rope capacity up to 1750 m
✅ Rope excluder + encoder + travel limit switches for reliable rope management & safety monitoring
✅ Articulated boom for flexible outreach, compact stowage to save deck space
✅ Closed hydraulic‑mechanical drive system, high reliability for marine salt‑fog environment
✅ Customizable SWL options: 10t / 20t /60t /100t for different project requirements
Application Scenarios
- Subsea equipment installation & recovery
- Offshore platform supply & maintenance
- Offshore wind farm sub‑component handling
- PSV/OSV deck‑mounted lifting operation
- Deep‑water offshore engineering projects
Contact us for custom configuration, class certification (DNV/ BV/ CCS, etc.), and technical proposal.
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