Black discharge rubber hose with bolted carbon steel flanges at both ends

Discharge Rubber Hose with Steel Flange

Steel-flanged discharge hose for floating, onshore and submerged slurry lines, ID 100-1100mm at 0.5-4.2MPa working pressure.

Specifications for Discharge Rubber Hose with Steel Flange
Product Name	Dredging Discharge Rubber Hose with Steel Flange
Inner Diameter (ID)	100-1100 mm
Length	500-11800 mm
Working Pressure (WP)	0.5-4.2 MPa
Burst Pressure (BP)	1.5-12.6 MPa
Flange Type	Steel flange
Application	Offshore dredging pipeline or other dredging project
Origin	China

Get a quotation Email specifications

Specifications are supplied per order within the ranges shown. Send the flange drawing or the details of the section being replaced and the connection is machined to match.

Overview

The steel-flanged discharge hose is the workhorse section of a dredger's delivery line. It carries slurry, tailings and mixed material away from the pump and can be built into a floating line, an onshore line or a submerged line without changing the connection method. The body is a natural and synthetic rubber composite chosen for abrasion, corrosion and bending resistance, and the Q235 carbon steel flanges with welded nipples let a crew swap a worn section without cutting or re-welding pipe.

Who it is for

Dredging contractors, port construction companies and dredger owners who buy delivery line by the section and need a hose that fits the flange standard already on the vessel.

Key benefits

Fits floating, onshore and submerged pipeline positions with one flange standard
Wear warning layer in the lining indicates remaining service life before failure
Q235 carbon steel flanges with welded nipples take repeated bolt-up cycles
Multiple high-tensile textile reinforcement layers hold shape under pulsating pump pressure
Marked with East Dredging branding or the customer's own logo for fleet identification

Problems it solves

What goes wrong without it

1

Rigid steel spools crack or leak where a dredger's delivery line has to flex with swell, tide and pontoon movement; a rubber section absorbs that movement instead of transmitting it to the joint.

2

A worn discharge section normally means an unplanned shutdown. Bolted steel flanges let the crew change a section in place with the tools already on board.

3

Wear inside a delivery hose is invisible until it fails. The integrated wear warning layer shows service condition before a burst takes the line down.

Construction and technical features

Inner lining: black wear- and corrosion-resistant natural rubber compound with an integrated wear warning layer
Reinforcement: multiple layers of high-tensile textile for pressure resistance and structural stability
Outer cover: black weather- and abrasion-resistant natural rubber with a warning layer
Flanges: Q235 carbon steel with welded nipples
Marking: durable identification marking, customer logo available

Quality control

Raw material test on every batch of natural rubber, tensile textile and rubber additives before it enters the warehouse
Hose dimension check on inner diameter, outer diameter, wall thickness and flange alignment against the design drawing
Weight check on every hose to confirm it falls inside the agreed tolerance band
Hydrostatic or vacuum pressure test to the specified working pressure when the order calls for it
Third-party inspection can be arranged on request

Where it is used

Floating delivery line behind a cutter suction dredger working a navigation channel
Onshore discharge run from the shore connection to a reclamation cell
Submerged crossing where the line has to drop under a shipping lane
Port construction and water conservancy works where the line is re-laid between phases

Customisation

Inner diameter from 100 to 1100 mm and length from 500 to 11800 mm to match the existing line
Steel or sandwich flange, drilled to the flange table your fleet already uses
Customer logo and section numbering moulded into the marking layer
Working pressure specified inside the 0.5-4.2 MPa band for the duty

How it compares

Choose the steel flange version when the line is bolted up and broken down often and the crew needs a hard, repeatable sealing face. Choose the sandwich flange version when weight matters and the rubber-lined sealing face is preferred for the medium in contact. For sharp coral, weathered rock or angular material, step up to the armored discharge hose with internal wear-resistant steel rings.

Selection and use notes

Confirm the flange drilling and bolt circle against the section it replaces before ordering
Support the hose so its own weight is not carried by the flange bolts
Keep the bend radius inside the hose's rated range; do not force a tighter curve with the crane
Inspect the wear warning layer at each shutdown and rotate sections to even out wear

FAQ

Questions buyers ask

What inner diameters can you supply?

100 mm to 1100 mm. Length runs from 500 mm to 11800 mm, so most standard line sections can be matched without an adapter.

What is the working and burst pressure?

Working pressure is 0.5-4.2 MPa and burst pressure is 1.5-12.6 MPa, specified per order within those bands.

Can you drill the flanges to our existing standard?

Yes. Send the flange drawing or the bolt circle and hole count from the section you are replacing and the flanges are machined to match.

Can the hose carry our own logo?

Yes. The marking layer can carry East Dredging branding or your own logo and section numbering for fleet identification.

Is there an independent inspection option?

Yes. A third-party inspection agency can be invited to inspect according to your requirements.

How do I know when a section is worn out?

The lining carries a wear warning layer. Once it becomes visible the section has reached the end of its intended wear allowance and should be rotated out.