Cutter Suction Dredger Inverted Pile Cylinder
Cutter Suction Dredger Inverted Pile Cylinder
The strongest cylinder on the CSD. 7,500 KN of push force. 5,000 KN of pull. A 620 mm bore — the largest in the CSD hydraulic system. The inverted pile cylinder deploys and retracts the spud pile mechanism with enough force to handle the heaviest piles in the deepest, most resistant seabeds.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Cutter Suction Dredger Inverted Pile Cylinder |
| Features | Provide push and pull force for retracting and unfolding the steel pile |
| Bore Diameter | Up to 620 mm |
| Rod Diameter | Up to 360 mm |
| Stroke | Up to 5,200 mm |
| Thrust Force | Maximum 7,500 KN |
| Pulling Force | Maximum 5,000 KN |
| Working Pressure | Up to 32 MPa |
| Temperature Range | -40 °C to +100 °C |
| Application | Cutter Suction Dredger |
Push and Pull — Why the Inverted Pile Needs Force in Both Directions
Most hydraulic cylinders are designed primarily for one force direction — the extension stroke (push) carries the rated load, while retraction (pull) handles a lighter return load. The inverted pile cylinder is different: it must produce near-maximum force in both directions. The extension stroke (7,500 KN) unfolds and pushes the spud pile assembly into its operating position. The retraction stroke (5,000 KN) pulls the assembly back — extracting the pile from the seabed against soil suction and retracting the mechanism into the hull for transit.
This dual-direction force requirement produces the largest bore in the CSD cylinder family: 620 mm. The large bore generates high extension force, and the relatively thick rod (360 mm) provides a large annular retraction area for high pull force. The combination of large bore + thick rod + long stroke (5,200 mm) makes the inverted pile cylinder the heaviest single hydraulic component on a CSD.
Korea Ever-Power manufactures the inverted pile cylinder with forged barrel and rod, FEA-optimised wall thickness, and marine-grade anti-corrosion treatment. Browse the complete offshore hydraulic cylinder range for all CSD products.
CSD Hydraulic Cylinder Family at a Glance
The inverted pile cylinder is the most powerful unit in the three-cylinder CSD spud system. Here is how it compares to the traveling and piling cylinders:
| Cylinder | Bore | Stroke | Push | Pull |
|---|---|---|---|---|
| Traveling (#2) | 480 mm | 9,400 mm | 2,900 KN | — |
| Piling (#3) | 460 mm | 4,000 mm | 3,140 KN | — |
| Inverted Pile (#4) | 620 mm | 5,200 mm | 7,500 KN | 5,000 KN |
Design Considerations for Dual-Force Marine Cylinders
Designing a hydraulic cylinder that must deliver near-maximum force in both push and pull directions — while operating in a saltwater marine environment — presents unique engineering challenges that standard cylinder designs do not address:
- Rod diameter optimisation — the rod must be thick enough to provide high annular retraction area (for pull force) without being so thick that it reduces the bore area excessively (reducing push force). The 360 mm rod inside the 620 mm bore is an optimised balance point — providing 67% of full-bore push force on the retraction stroke.
- Buckling resistance at full extension — at 5,200 mm stroke with 7,500 KN of push force, the rod must resist Euler buckling. The 360 mm rod diameter provides a slenderness ratio well below the critical buckling threshold, but FEA verification is mandatory for each specific installation geometry.
- ️ Seal design for bidirectional high pressure — the piston seal must withstand full 32 MPa pressure on both faces — not just on the bore side (extension) as in most single-direction cylinders. Korea Ever-Power uses bidirectional polyurethane piston seals with symmetrical lip profiles for equal sealing performance in both directions.
- ⚙️ Port sizing for equal flow rate — to achieve similar extension and retraction speeds despite the different piston areas, the retraction port is sized larger than the extension port. This compensates for the smaller annular area and maintains balanced cycle times.
Our Manufacturing Edge for Large-Bore Marine Cylinders
The 620 mm bore inverted pile cylinder demands manufacturing capabilities that many hydraulic cylinder factories cannot offer. Korea Ever-Power's facility handles bores up to 700 mm with in-house deep-hole boring, honing, and surface treatment — no outsourcing of critical processes.
- Deep-hole boring and honing up to 700 mm bore, lengths up to 12 metres
- ️ In-house HVOF ceramic spraying and laser cladding lines
- FEA analysis team for buckling, fatigue, and structural verification
- Classification society liaison for BV, DNV, LR, ABS documentation
Custom Inverted Pile Cylinder OEM & ODM
FAQ
Common questions about the cutter suction dredger inverted pile cylinder answered by Korea Ever-Power engineers:
What Our Customers Say
"The 620 mm bore inverted pile cylinders are massive — each one weighs over 4 tonnes. But the pull force performance in our stiff North Sea clay is exactly as specified. No extraction stalling even in overconsolidated glacial till."
H. Bakker — Fleet Superintendent, Netherlands
"We ordered a set of inverted pile cylinders for a new-build CSD. The FEA report showing the buckling analysis at full 5,200 mm extension gave our class surveyor (BV) the confidence to approve without additional prototype testing."
Eng. M. Dupont — Design Manager, France
"Heavy-duty cylinders with good build quality. The laser cladding on the rod is noticeably smoother than the HVOF ceramic on our traveling cylinders — better seal contact, lower friction. Minor issue: the delivery crate was too heavy for our dockside crane, requiring a mobile crane hire."
A. Kowalski — Port Engineer, Poland
"Replacement inverted pile cylinders for a 15-year-old CSD. Korea Ever-Power reverse-engineered from our original drawings and upgraded the seals from NBR to FKM. The new seals last 2x longer in our warm-water tropical dredging environment."
Capt. B. Ndegwa — Operations Director, Kenya
"The integrated sequence valve on the inverted pile cylinder prevents the spud from free-falling if the hydraulic supply drops — a critical safety feature that our previous supplier offered only as an external add-on. Cleaner installation, fewer leak points."
T. Nakamura — Chief Engineer, Japanese dredging contractor
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