Knuckle Boom Crane
--Efficient, flexible, and reliable deck-lifting solutions
YFM Knuckle Boom Crane is specially designed for ships, offshore platforms, and harsh marine environments. It can efficiently complete cargo handling, equipment installation, and rescue support tasks by combining high-strength structures, intelligent hydraulic systems, and modular configurations.
The offshore crane's unique knuckle boom design achieves maximum operational range in limited spaces, saving 30% more deck space than traditional straight-boom cranes. This makes the knuckle boom crane an ideal choice for offshore operations.
In complex and harsh sea conditions, the YFM knuckle boom crane also adopts the active heave compensation(AHC) method to reduce the impact of waves on offshore engineering operations.
Product Features
- Cab/wireless remote control optional
- Multi-joint knuckle boom structure, saving deck space
- Electric/hydraulic drive, supporting 360° full rotation
- Load range from 1 ton to 100 tons (customizable)
- High-strength steel - IP66 protection rating
- Anti-corrosion coating
- Salt spray corrosion resistance test
- Wind and wave resistance up to Beaufort scale 8
- Certified by international organizations such as DNV-GL, RINA, BV, CCS, RS, ABS, etc.
- PLC control panel
- Optional dynamic compensation system (DCS)
- Modular design
- Multiple safety protection devices
Success Design Stories
35T Electro-Hydraulic Knuckle Boom Offshore Crane c/w AHC System
Design Standards
1. Certificate: "Guide for Certification of Lifting Appliance" by ABS,2013
2. Design Life: Crane's design is based on a lifetime of 20 years.
3. Lift definition(s):
- Lifts between vessel and quayside in sheltered waters, i.e., harbor lift,
- lifts on the vessel's deck, i.e., internal lift
- Lifts from vessel to vessel. The derating curve will be issued
- Lifts to deep water, subsea lift, Reduce above SWL with a weight of the submerged rope and DAF due to hydrodynamic forces and add buoyancy of the load
- Lifts to deep water in active heave compensation, AHC lift General
Temperature conditions:
1. Design temperature: -10 degrees Celsius
2. Ambient temperature: -20 to +45 degrees Celsius
3. Wind conditions: According to requirements of the applicable classification society
4. Environment atmosphere: High salinity
5. Humidity: relative 85%
Technical Data
| Slewing Angle | <350º | Luffing time | 100s Up/down | ||
| Slewing Speed | 0~0.7rpm | Loading forces to deck structure | |||
| Dynamic Factor(Daf) | 1.4 | Dynamic overturning moment | 9500 KN.M | ||
| Extra Safetor Factor(SFI) | 1.4 | Dynamic vertical force | 1200 KN | ||
| For slewing system&foundation(Daf+SFI) | 2.0 | Dynamic horizontal force | 185 KN | ||
| Main Winch Data | Lifting Capacity(SWL) | 35T@12m,20T@20m | Aux Winch Data | Lifting Capacity(SWL) | 5T with 1.5T man riding Function |
| Wire Fall | 1 | Wire Fall | 1 | ||
| Working Radius | 5.0m(Min) / 20m(Max) | Working Radius | 5.2m(Min) / 22m(Max) | ||
| Main Lifting Speed(Normal) | 0~20m/min(35T) | Main Lifting Speed(Normal) | 0~60m/min(full load) | ||
| 0~50m/min(Light Load) | |||||
| Drum Capacity | 2000m | Drum Capacity | 110m | ||
| Hook Travel Distance | 1700m | Hook Travel Distance | 100m | ||
| List/trim Condition | 5º/2º | List/trim Condition | 5º/2º | ||
| Steel Wire Dia | 44mm | Steel Wire Dia. | 19mm | ||
| Outer Layer, Full Load | 35T | Outer Layer, Full Load | 5T | ||
| Wire Rope | Anti-Twist Type, Galvanized | Wire Rope | Anti-Twist Type, Galvanized | ||
| Pedestal Diameter(outer) | 2800mm | Pedestal Wall thickness | 20 mm | ||
NOTE: All operational speeds above are based on average volumetric efficiencies from our hydraulic components suppliers. A speed variation tolerance of +10% to -5% is within the accepted range and should be considered.
| Depth | Remaining Hook Lifting Capacity (Wet Condition: t) | Estimated Deployment Capacity (Dry Condition: t) | ||
| 0 | 35 | 35 | ||
| 500 | 30 | 33 | ||
| 1000 | 25 | 28 | ||
| 1500 | 21 | 24 | ||
| 1700 | 17 | 19 | ||
Note: Hydrodynamic forces, etc., are not considered in this table.
Active Heave Compensation data(from Scantrol,Norway):
| 1. Performance Case AHC/AT,0~15T SWL, Active Heave Compensation data: | 2. Performance Case AHC/AT,0~35T SWL, Active Heave Compensation data: | ||||
| Design parameters | Design parameters | ||||
| AHC SWL | 0-15T | AHC SWL | 0-35T | ||
| Displacement | 4m | Displacement | 3m | ||
| Wave period | 10s | Wave period | 12s | ||
| Max Heave compensation speed | 1.4m/s | Max Heave compensation speed | 0.8m/s | ||
Note: 1. Displacement is defined as the vertical movement of the point where the wire leaves the ship. This can be the nose pulley of a crane or a pulley mounted in an A-frame.
Note: The electric system onboard should be able to withstand possible regenerated power from the main motors. The estimated power is calculated as an approximate maximum value that occurs during the lowering of the Maximum load and a peak value in AHC/CT at the maximum load and speed.
Typical application scenarios
✔ Installation and maintenance of offshore wind power equipment
✔ Material supply for oil and gas platforms
✔ Cargo transfer between ships
✔ Emergency rescue and salvage operations
Customized Services
We provide full-process solutions, including:
- Load and space adaptation analysis
- Special environment configurations such as explosion-proof and low-temperature resistance
- Integration of AHC (Active Heave Compensation) technology
Why choose YFM?
✅ 15 years of experience in marine equipment manufacturing, with over 100 successful cases worldwide
✅ 24/7 technical support and spare parts supply
✅ OEM/ODM services tailored to customer needs
👍 www.yfm-crane.com
👍 +86 15818704927
👍 anne@yfm-crane.com/info@yfm-crane.com
👍 https://www.yfm-crane.com/contact-us
One-Stop Marine&Offshore Lifting Equipment Manufacturer in China
Dear Customer,
Should you have any ideas or concerns, please feel free to share them with us at any time. YFM will tailor high-quality and cost-effective lifting equipment solutions to your specific needs, helping your marine business reach new heights.
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