YFM knuckle boom offshore cranes are tailor-made for vessels, offshore platforms, and harsh marine environments. Adopting high-strength structural design, intelligent hydraulic systems, and modular layout, the crane efficiently performs cargo handling, equipment installation, and maritime rescue support tasks.
When operating under complex and harsh sea conditions, the YFM knuckle boom crane can be fitted with an Active Heave Compensation (AHC) system, which greatly mitigates the impact of wave motion on offshore lifting and engineering operations.
Below we share our representative success story: 35T Electro-Hydraulic Knuckle Boom Offshore Crane(with c/w AHC System).
This project crane is designed and manufactured in full accordance with international marine specifications, with clear technical design standards and environmental adaptability parameters as follows:
1. Design Standards
In strict compliance with international marine industry specifications, our offshore cranes follow authoritative design and certification standards.
1. Certification: Compliant with ABS "Guide for Certification of Lifting Appliance" (2013 edition).
2. Design Life: The YFM offshore crane is engineered for a service life of 20 years.
3. Lifting Application Scope:
- Harbor lift: Lifting operations between vessel and quayside in sheltered waters;
- Internal lift: Lifting tasks on the vessel's own deck;
- Ship-to-ship lift: Applicable to vessel-to-vessel operation with customized derating curves provided;
- Subsea lift: Deep-water lifting with capacity adjusted by deducting submerged rope weight and DAF from the rated SWL, while taking load buoyancy and hydrodynamic forces into account;
- AHC lift: Deep-water lifting supported by the Active Heave Compensation system for general offshore working scenarios.
2. Temperature & Environmental Conditions
- Design temperature: -10°C
- Operating ambient temperature range: -20°C to +45°C
- Wind conditions: Designed in accordance with applicable classification society requirements
- Atmospheric environment: High salinity marine atmosphere
- Relative humidity: Up to 85%
3. Technical Data
3.1 Parameters
| 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.
3.2 Lifting Capacity at Different Depths
| 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.
3.3 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.
4. Product Features
This Offshore AHC Crane has the following characteristics:
- Cab/wireless remote control optional
- Multi-joint knuckle boom structure, saving deck space
- Electric/hydraulic drive, supporting 360° full rotation
- Load range from 5 to 200 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
- Integration of AHC (Active Heave Compensation) technology
5. Product Advantages
These Knuckle boom cranes adopt a distinctive knuckle boom design, achieving a maximum working radius within limited space. It saves more than 30% deck space compared with traditional straight-boom cranes.
Equipped with an intelligent hydraulic system and PLC control, this offshore crane runs smoothly and accurately, lowering operation errors and improving overall working efficiency for long-term marine offshore service.
Built with high-strength steel, IP66 protection grade, and professional anti-corrosion coating, the Knuckle boom crane has passed strict salt spray tests. It can operate steadily in high salinity marine atmosphere, a wide temperature range of -20°C to +45°C, and wind conditions up to Beaufort scale 8.
Fitted with multiple safety protection devices together with standard DAF 1.4 and SFI 1.4, the offshore crane effectively prevents overload and overturning risks. It is certified by mainstream classification societies includes ABS, DNV-GL, BV, CCS, and RS, ensuring high safety of personnel and equipment during operation.
This offshore crane supports both cabin control and wireless remote control.AHC active heave compensation system and DCS dynamic compensation system are optional, and personalized customization is available to match different load, space, and special working environment requirements.
6. Typical application scenarios
The knuckle boom offshore crane is widely applicable to multiple marine working scenarios.
It covers installation and maintenance of offshore wind power equipment, material supply for oil and gas platforms, cargo transfer between ships, as well as emergency rescue and salvage operations.
These knuckle boom cranes are also perfectly matched for working vessels, offshore support vessels, platform supply vessels, and offshore engineering vessels.
It is ideal for daily logistics supply and equipment replacement on offshore platforms, coastal and offshore marine engineering construction, and lifting tasks under narrow deck and space-restricted conditions.
7. Customized Services
YFM crane provides one-stop full-process customized solutions, including:
- Load and installation space adaptation analysis
- Special environmental configuration such as explosion-proof and low-temperature resistance
- Custom matching of AHC / DCS heave compensation system
- Personalized design of wireless remote control and automatic control system
- Custom heavy-duty anti-corrosion coating for high-salinity marine environments
- Voltage and electrical system adaptation according to ship grid parameters
- Non-standard customized design of pedestal size and installation interface
- Customization of multi-language operation interface and control logic
- Custom design of lifting capacity and working radius
- Custom selection of driving mode
- On-site installation guidance, commissioning, and technical training services
8. Why choose YFM cranes?
✅ 15 years of experience in marine lifting equipment manufacturing, with over 100 successful cases worldwide
✅ 24/7 technical support and spare parts supply
✅ OEM/ODM services tailored to customer needs
✅ Strictly designed and manufactured in accordance with international classification society standards
✅ Complete independent R&D and design capability for knuckle boom offshore crane
✅ Excellent environmental adaptability for high salinity and wide temperature working conditions
✅ Strict quality inspection and full factory testing before delivery
✅ Professional one-stop customized solution from design to after-sales
✅ Compact structure with space-saving design suitable for various ship deck installation.
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.