Ro-ro Platform Main Operating Cylinder
Ro-ro Platform Main Operating Cylinder
Cars, trucks, buses, and trailers drive on and off a ro-ro vessel via a ramp. The main operating cylinder raises, lowers, and retracts this ramp — a multi-tonne steel structure that must align precisely with quay heights ranging from 1 to 12 metres above waterline.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Ro-ro Platform Main Operating Cylinder |
| Features | Retract and extend the springboard and ramp |
| Bore Diameter | 100 mm – 400 mm |
| Rod Diameter | 50 mm – 180 mm |
| Stroke | Up to 7,300 mm |
| Thrust Force | Maximum 3,500 KN (bore 125 mm / 28 MPa) |
| Working Pressure | Up to 28 MPa |
| Application | Ro-Ro Platform (Roll-on/Roll-off Vessel) |
How the Ro-Ro Ramp System Works
A ro-ro vessel loads and discharges vehicles through one or more ramps — large steel platforms that bridge the gap between the vessel's vehicle deck and the quay. The ramp must adjust to varying tidal heights, quay elevations, and vessel draft changes as cargo is loaded. The main operating cylinder is the primary actuator that controls all ramp movement.
The 7,300 mm stroke covers the full range of ramp extension needed for deep-water berths (low quay) through to high-freeboard terminals. The wide bore range (100–400 mm) allows Korea Ever-Power to match the cylinder to the ramp weight — from small passenger ferry ramps (100 mm bore) to large ocean-going cargo vessel ramps (400 mm bore). Browse the offshore hydraulic cylinder range for the complete ro-ro cylinder system.
Ro-Ro Hydraulic Cylinder Family
The ramp system on a ro-ro vessel uses four cylinder types working together. The main operating cylinder is the largest and most powerful:
Raises, lowers, extends, and retracts the ramp. The primary actuator — bore up to 400 mm, thrust up to 3,500 KN.
Locks the ramp in the stowed position during sea transit. Available with mechanical or hydraulic self-locking.
Fine-adjusts the ramp height to match the quay elevation. Smaller bore (50–125 mm), shorter stroke (≤1,000 mm).
Key Advantages of the Main Operating Cylinder
- Wide bore range (100–400 mm) — a single product family covers everything from small ferry ramps to large ocean-going ro-ro vessel ramps. No need to source from different suppliers for different vessel sizes.
- 7,300 mm maximum stroke — accommodates the full range of quay heights and tidal variations. The long stroke eliminates the need for additional ramp extension mechanisms on vessels that operate across ports with varying berth geometries.
- ️ Stainless steel rod option — for vessels operating in aggressive salt spray environments. The rod surface resists pitting and crevice corrosion without the need for chrome plating, which can crack under repeated bending loads at the hinge points.
- ⚙️ Integrated load-holding valves — prevent the ramp from dropping if hydraulic supply is lost. A safety-critical requirement for ramps that extend over water between the vessel and quay, where an uncontrolled drop could injure stevedores or damage vehicles.
Ro-Ro Cylinder Supply and Service
Korea Ever-Power supplies the complete ro-ro ramp cylinder set (main operating + latch + jacking) as a single-source package. Provide the ramp GA drawing, ramp weight, operating height range, DNVGL or other class requirement, and stainless steel preference. Complete set with engineering approval, test certificates, seal kits, and classification documentation.
FAQ
What Our Customers Say
"We fitted Korea Ever-Power main operating cylinders on 2 stern ramps of our cargo ro-ro vessel. The 350 mm bore cylinders handle the 80-tonne ramp weight smoothly. The stainless steel rods are a significant upgrade — our previous chrome rods corroded within 3 years in the Baltic Sea environment."
Capt. E. Lindberg — Fleet Technical Manager, Swedish ro-ro operator
"Ordered main operating + latch + jacking cylinders for a new ferry. Having a single supplier simplified our DNVGL submission. All documentation was aligned and consistent — the surveyor approved the complete ramp hydraulic system in one visit."
M. Papandreou — Naval Architect, Greek ferry company
"Reliable cylinders for our inter-island ferry ramps (bore 150 mm, stroke 4,500 mm). After 18 months of twice-daily ramp operations, no seal leaks or rod surface issues. The integrated load-holding valves passed our annual safety inspection without comment."
A. Cruz — Maintenance Chief, Philippine ferry operator
"Emergency replacement for a failed stern ramp cylinder on our cargo vessel. Korea Ever-Power delivered in 6 weeks — the same European OEM quoted 16 weeks. The replacement matched our existing hydraulic connections perfectly."
J. Thompson — Engineering Superintendent, UK shipping line
"We operate ro-ro vessels across 3 different tidal ranges (Mediterranean, Atlantic, North Sea). The 7,000 mm stroke cylinders handle all our port conditions without any mechanical extension adapters."
D. Moreau — Operations Director, French ro-ro logistics
Related Hydraulic Cylinder Categories
Детали
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