Dredging Rubber Hose Classification, Specifications & Technical Features

Dredging Rubber Hose Classification & Application

Classification by Function

This is the core classification method, determining whether the hose is used for "suction" or "discharge."

Suction Hose

Application: Connects to the inlet of the dredge pump to extract slurry from the riverbed or seabed.

Technical Features: Must withstand high vacuum negative pressure. The hose body is reinforced with a spiral steel wire helix embedded in the tube to prevent collapse (flattening) under strong suction forces.

Discharge Hose

Application: Connects to the outlet of the dredge pump to transport slurry under high pressure to the reclamation area.

Technical Features: Must withstand high positive pressure and severe scouring. The focus is on the tensile strength of the reinforcement layer and the abrasion resistance of the cover.

Classification by Installation & Buoyancy

This determines whether the hose floats on the surface or operates underwater.

Floating Hose

Application: Used for surface pipelines, connecting the vessel to the shore or underwater pipelines.

Technical Features: The hose body is encased in or filled with buoyancy materials (such as foam or rubber floats) to provide sufficient buoyancy to keep the line afloat.

Submerged Dredge Hose

Application: Used underwater, serving as a connection between floating lines and shore pipelines, or as a seabed pipeline.

Technical Features: Contains no buoyancy material. It has a heavier self-weight and a thicker cover layer, offering superior resistance to seabed abrasion, corrosion, and hydrostatic pressure.

Classification by Structure

This determines the connection method and specific use cases.

Flanged Dredging Hose (Flexible Connection)

Application: Acts as a "flexible connection" in the pipeline system, connecting steel pipes, PE pipes, or dredger outlets.

Technical Features: Equipped with steel flanges (fixed or rotating) at both ends.

Structure: High-quality flanged hoses utilize a composite reinforcement structure consisting of soft spiral steel wire helix combined with high-strength fiber layers. This design ensures the hose maintains its roundness under vacuum while providing the flexibility to bend and rebound during operation.

Armored Hose

Application: Used in extreme abrasive conditions involving shells, coral, or rock fragments.

Technical Features: The inner liner is embedded with hard steel rings or heavy-duty wear-resistant layers, providing excellent impact and abrasion resistance.

Bow Discharge Hose

Application: Specifically designed for the bow loading system of Trailing Suction Hopper Dredgers (TSHD).

Technical Features: Designed to adapt to complex movements and angle changes between the hull and external pipelines.

Robber Pipes Specifications

Diameter Range

We can produce large-diameter dredging hoses with nominal inner diameters ranging from DN150 (6 inches) to DN1300 (52 inches).

Common Specifications: DN200(8"), DN250(10"), DN300(12"), DN350(14"), DN400(16"), DN450(18"), DN500(20"), DN600(24"), DN700(28"), DN800(32"), etc.

Pressure Ratings

Depending on the project's transmission distance and pump pressure, we offer different pressure resistance levels.

Working pressure range covers 0.5 MPa to 2.5 MPa (5 bar to 25 bar).

Length

Standard lengths are typically 6 meters, 10 meters, or 12 meters, but can be customized according to customer requirements.

Flange Standards

We can supply rotating or fixed steel flanges compliant with GB (Chinese), EN (European), ANSI (American), and JIS (Japanese) standards.

Key Technical Features

Wear-Resistant Inner Liner: Made from high-quality wear-resistant rubber with a formula similar to tire tread rubber. It has a high abrasion index to effectively resist long-term scouring by sand and gravel. Some products feature a double-layer wear-resistant inner liner.

Composite Reinforcement Layer: Uses a combination of soft spiral steel wire and high-strength synthetic fiber cord (e.g., D3 cord). This hybrid structure ensures the hose can withstand high pressure while maintaining excellent toughness and bending resilience.

High Resilience: The specialized construction allows the hose to quickly rebound to its original shape after being impacted by waves or bent, ensuring safety and continuity in offshore operations.

Strict Manufacturing Process: The production of large-diameter dredging hoses requires high technical standards and skilled workers to ensure stable and reliable product quality.

FAQs

Q: What is the main difference between suction and discharge hoses?

A:The main difference lies in the structural reinforcement and pressure resistance.

Suction Hose: Used for extracting slurry, it must withstand high vacuum negative pressure. Therefore, it is reinforced with a spiral steel wire helix embedded in the tube to prevent the hose from collapsing under strong suction.

Discharge Hose: Used for transporting slurry, it primarily withstands high positive pressure and material scouring. Its focus is on multi-layer fiber and wire reinforcement to resist bursting and abrasion.

Q: Do flanged dredging hoses have steel wire inside?

A: Yes, they do. High-quality flanged dredging hoses are not made of fiber layers alone.

To ensure the hose maintains its shape under vacuum and does not burst under positive pressure, we use a composite reinforcement structure. This structure combines a soft spiral steel wire helix with high-strength fiber layers. This design ensures the hose maintains its roundness while providing excellent flexibility and resilience to adapt to wave movements at sea.

Q:What is the difference between floating hoses and submerged hoses?

A: The difference lies in the buoyancy design and application scenario.

Floating Hose: The hose body is encased in or filled with buoyancy materials, allowing it to float on the water surface for surface pipeline connections.

Submerged Hose: Contains no buoyancy material and has a heavier self-weight. It is specifically designed for underwater environments, featuring a thicker cover layer with superior resistance to seabed abrasion and seawater corrosion.