Offshore Crane Main Boom Luffing Cylinder
Offshore Crane Main Boom Luffing Cylinder
Lifting 100-tonne loads from a supply vessel to a platform deck — 40 metres above the waterline, in 3-metre swells. The main boom luffing cylinder raises and lowers the boom through its full arc, controlling the reach and height of every lift with 8,454 KN of thrust.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Offshore Crane Main Boom Luffing Cylinder |
| Features | Provides thrust force for pitching the crane boom |
| Bore Diameter | Up to 580 mm |
| Rod Diameter | Up to 440 mm |
| Stroke | Up to 5,635 mm |
| Thrust Force | Maximum 8,454 KN (bore 580 mm / 32 MPa) |
| Working Pressure | Up to 32 MPa |
| Application | Offshore Crane |
How the Main Boom Luffing Cylinder Controls Crane Reach
An offshore crane sits on a pedestal mounted to the deck of a platform, FPSO, or construction vessel. The main boom pivots at its base — the luffing cylinder pushes the boom upward (increasing the boom angle, reducing reach, increasing height) or allows it to lower (decreasing angle, increasing reach, reducing height). The operator controls the boom angle to position the hook precisely over the load — which may be on a supply vessel heaving 2–4 metres in the waves.
The 5,635 mm stroke covers the full boom arc from near-horizontal (maximum reach for loading from supply vessels alongside) to near-vertical (stowed position for storm survival). The 8,454 KN thrust must overcome the boom weight, the suspended load, wind forces, and the dynamic acceleration from vessel motion — all simultaneously. Browse the offshore hydraulic cylinder range for related crane products.
Offshore Crane Hydraulic Cylinder Family
Korea Ever-Power manufactures three hydraulic cylinder types for offshore cranes — each for a different boom configuration:
Raises/lowers the main boom. Single-direction thrust (push only). Bore ≤580 mm, thrust 8,454 KN.
Adjusts the knuckle joint angle on folding-boom cranes. Dual-direction: push 8,454 KN + pull 3,589 KN.
Controls the A-frame mast angle. Dual-direction: push 8,454 KN + pull 3,589 KN.
Key Advantages for Offshore Crane Applications
- Designed for dynamic sea-state loading — the cylinder must handle not just the static boom weight and load, but also the dynamic forces from vessel roll, pitch, and heave. FEA analysis verifies fatigue life under combined static + dynamic loading.
- Integrated load-holding valves — prevent boom drop in case of hydraulic supply failure. A falling boom on an offshore crane is a catastrophic safety event — the valve must hold the full boom + load weight indefinitely.
- ️ Marine-grade anti-corrosion — ceramic spraying (HVOF), laser cladding, or hard chrome on the rod. The cylinder operates in the splash zone at boom pivot height — one of the most corrosive positions on the crane structure.
- ⚙️ SWL certification — the luffing cylinder is part of the crane's certified Safe Working Load (SWL) system. Korea Ever-Power provides documentation for DNV, LR, ABS, and BV crane classification. Contact the Korea Ever-Power hydraulic cylinder team for crane projects.
Offshore Crane Cylinder OEM & ODM
Provide the crane model, boom weight, maximum SWL at each radius, luffing angle range, system pressure, and classification requirement. Korea Ever-Power delivers the complete luffing cylinder with FEA report, test certificates, and classification documentation.
Frequently Asked Questions
What Our Customers Say
"The main boom luffing cylinder on our 250-tonne SWL pedestal crane has been in offshore service for 11 months. The laser-clad rod shows zero corrosion despite continuous exposure to North Sea salt spray at the boom pivot."
Eng. G. Thorsen — Crane Superintendent, Norwegian platform operator
"Korea Ever-Power supplied luffing cylinders for 2 identical cranes on our FPSO. The matched pair performance is excellent — boom angle synchronisation between the two cranes is within 0.3° at all positions."
K. Osei — Mechanical Engineer, West African FPSO
"Reliable cylinder at a competitive price. The integrated load-holding valve passed our annual crane inspection without comment. One minor observation: the paint on the barrel exterior could be upgraded to a heavier marine epoxy for splash-zone installations."
T. Hashimoto — Quality Inspector, Japanese crane manufacturer
"Emergency replacement for a failed luffing cylinder on our platform crane. Korea Ever-Power delivered a form-fit replacement in 7 weeks — our European OEM quoted 18 weeks. The crane was back in service before the next scheduled supply vessel visit."
A. Bakri — Operations Manager, Middle East offshore platform
"Third order from Korea Ever-Power. We now specify their luffing cylinders on all new crane installations across our platform fleet. The DNV documentation package is consistently thorough and accepted first-time."
Capt. V. Nair — Fleet Engineering Director, Indian offshore company
Related Hydraulic Cylinder Categories
Additional information
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