Name: Trailing Suction Dredger Overflow Cylinder - Korea Trailing Suction Dredger Overflow Cylinder Manufacturers, Suppliers - hydraulic cylinders price
SKU: 78a56c47857f

Trailing Suction Dredger

Trailing Suction Dredger Overflow Cylinder

The hopper fills with a slurry of water and sediment. The overflow cylinder raises and lowers a vertical tube — the relief tube — to set the water level. Lower the tube: water overflows earlier, carrying fine sediment away. Raise it: more water stays, heavier load. A 6-metre stroke gives the operator full control over cargo density.

≤280mmBore

≤6,000mmStroke

900 KNPull Force

32 MPaPressure

Technical Specifications

Parameter	Specification
Product Name	Trailing Suction Dredger Overflow Cylinder
Features	Provide pulling force for lifting and lowering the relief tube
Bore Diameter	Up to 280 mm
Rod Diameter	Up to 180 mm
Stroke	Up to 6,000 mm
Pulling Force	Maximum 900 KN
Working Pressure	Up to 32 MPa
Application	Trailing Suction Dredger

Why Overflow Height Controls Dredging Productivity

Trailing suction dredger hopper overflow system

When a TSHD dredges, the suction pipe delivers a slurry of water and sediment into the hopper. The sediment settles to the bottom; the excess water must be removed. The overflow tube — a vertical pipe inside the hopper — sets the maximum water level. Water above the tube rim flows over and out through the hull.

Lowering the overflow tube reduces the water level, allowing excess water to drain earlier in the loading cycle. This increases the sediment concentration in the hopper (more tonnes of dry material per voyage) but also increases the rate of fine sediment loss through the overflow. Raising the tube retains more water but dilutes the cargo.

The overflow cylinder's 6,000 mm stroke gives the operator continuous adjustment across the full hopper depth — from maximum retention (tube fully raised) to rapid drainage (tube fully lowered). Optimising this balance can increase payload by 10–25% per voyage on the same vessel. Browse the offshore hydraulic cylinder range for related TSHD products.

Overflow Cylinder in the TSHD Hydraulic System

The overflow cylinder is one of four main hydraulic cylinder types on a TSHD. Each serves a distinct role in the dredging cycle:

Heave Compensation (#5)

Absorbs wave motion to keep the draghead on the seabed at constant pressure.

Hanger (#6)

Deploys and recovers the suction pipe assembly from the hull.

Mud Door (#7)

Opens the hopper bottom for rapid bottom discharge of dredged material.

Overflow (#8) ← this product

Controls the overflow tube height to optimise cargo density during loading.

Key Advantages of the Overflow Cylinder

Trailing Suction Dredger Overflow Cylinder

6,000 mm stroke — the longest stroke among TSHD hopper cylinders. Full-depth adjustment of the overflow height, from hopper floor level to maximum waterline. Enables operation across varying hopper fill conditions.
Compact bore (280 mm) — the overflow tube is lightweight compared to the mud door or suction pipe. The cylinder is sized for the tube weight plus sediment drag forces — not for massive hull-splitting or pipe-lifting loads. This makes it the most compact cylinder on the TSHD.
️ Corrosion-resistant — the cylinder operates inside the hopper, continuously immersed in a slurry of seawater, sand, silt, and clay. Anti-corrosion rod treatment and abrasion-resistant seals are standard.
⚙️ Customisable force and speed — working pressure, bore, stroke, and valve integration are tailored to the specific TSHD model. Contact the Korea Ever-Power hydraulic cylinder team for sizing.

Overflow Cylinder OEM & ODM

Korea Ever-Power manufactures overflow cylinders for new-build and existing TSHDs. Provide the vessel's hopper dimensions, overflow tube weight, required stroke, system pressure, and operating environment. The factory delivers the complete cylinder with anti-corrosion treatment, saltwater seals, test certificates, and seal kits. Classification society documentation (BV, DNV, LR, ABS) available on request.

Korea Ever-Power hydraulic cylinder production line

Hydraulic cylinder types and configurations

FAQ

What is the difference between the overflow cylinder and the mud door cylinder?

The overflow cylinder controls the overflow tube height during loading (optimising cargo density). The mud door cylinder opens the hopper bottom for cargo discharge. Different functions, different force requirements, different positions on the vessel.

Why does the overflow cylinder need 6,000 mm of stroke?

The stroke matches the depth of the hopper. The overflow tube must be adjustable across the full hopper depth — from the bottom (for maximum drainage) to the top (for maximum water retention). On large TSHDs with 6+ metre deep hoppers, the full 6,000 mm stroke is required.

How does the overflow tube affect dredging efficiency?

Optimal overflow height can increase payload per voyage by 10–25%. Too high = excess water dilutes the cargo. Too low = fine sediment is lost through the overflow. The dredge operator adjusts the tube height continuously during loading based on material type and density targets.

Can the overflow cylinder withstand immersion in abrasive slurry?

Yes — the cylinder operates inside the hopper, immersed in a mixture of seawater and dredged sediment. Ceramic or laser-clad rod surface, abrasion-resistant polyurethane seals, and a heavy-duty wiper with scraper ring are standard for this application.

Can it be retrofitted on an existing TSHD?

Yes. Korea Ever-Power manufactures replacement overflow cylinders from existing drawings or by reverse-engineering the original. Browse mobile machinery hydraulic cylinders and industrial engineering hydraulic cylinders for related applications.

What Our Customers Say

★★★★★Apr 2026

"The 5,800 mm stroke overflow cylinders on our 10,000 m³ TSHD have been running for 14 months. The laser-clad rods are holding up remarkably well in the abrasive hopper environment. Our previous hard-chrome rods needed replating after every major drydock."

Capt. S. Andersen — Fleet Captain, Norwegian dredging company

★★★★★Dec 2025

"Compact and well-made. The 280 mm bore is exactly right for the overflow tube weight on our 4,000 m³ TSHD. No over-engineering, no unnecessary cost. The cylinders fit into the existing hopper brackets without modification."

M. Bakker — Maintenance Engineer, Netherlands

★★★★☆Aug 2025

"Ordered 2 overflow cylinders for a TSHD refit. Quality is good, delivery was on time (9 weeks). The abrasion-resistant seals are noticeably tougher than the OEM seals we had been using — holding up better in our sandy dredging conditions."

J. Ferreira — Chief Engineer, Brazilian dredging contractor

★★★★★May 2025

"We combined an order for overflow cylinders, mud door cylinders, and heave compensation cylinders for the same TSHD. Korea Ever-Power handled the complete set — same delivery date, same material batch, same quality. Much easier than sourcing from 3 different suppliers."

T. Kwon — Procurement Director, South Korean fleet

★★★★★Jan 2025

"We needed overflow cylinders with DNV class documentation for our internationally flagged TSHD. The factory provided material certificates, welding procedures, and witnessed test reports that satisfied our DNV surveyor without any re-work."

G. Larsen — Classification Manager, Denmark