Choosing the right armoured dredging discharge hose involves considering several factors such as working environment, medium characteristics, pressure requirements, abrasion resistance, and connection methods. Here is a detailed selection guide:

1. Determine the application scenario:
– Dredging type: riverbed cleaning, underwater excavation, port construction, mine tailings transportation, etc.
– Medium characteristics:
– Material being transported: mud, gravel, sludge, slurry, etc.
– Particle size and hardness (such as sharp stones or highly abrasive substances).
– Medium temperature (ambient or high temperature).
– Chemical properties (corrosive nature, such as seawater or acid-base environments).

2. Key performance parameters:
(1) Pressure rating:
– Working pressure: Select the hose’s pressure tolerance based on the maximum pump system pressure (e.g., 10 bar, 15 bar, 25 bar).
– Burst pressure: The hose’s maximum pressure capacity, typically 2 to 4 times the working pressure.
(2) Abrasion resistance:
– Liner material: High-abrasion-resistant rubber (such as natural rubber NR, styrene-butadiene rubber SBR, or polyurethane PU) is commonly used.
– Armoring layer: Reinforced with steel wire or spiral steel bands to protect the hose from tearing or flattening.
– Thickness of the abrasion-resistant layer: The thicker the lining, the stronger the resistance to abrasion (e.g., over 10mm for highly abrasive media).
(3) Bend radius and flexibility:
– Must accommodate site bending needs to avoid damage from excessive bending.
– Armoring layer design must balance flexibility and pressure resistance.
(4) Size and length:
– Inner diameter (ID): Common specifications range from 100mm to 1200mm, depending on flow requirements.
– Length: Standard lengths usually range from 10m to 20m, but custom lengths are also available.

3. Structural design:
– Inner layer (liner): Abrasion-resistant rubber, corrosion-resistant.
– Reinforcement layer:
– Multiple layers of high-strength fibers (such as polyester or aramid) or steel wire braiding/wrapping.
– Armoring layer: Spiral steel wire or steel band (for negative pressure resistance and external impact).
– Outer layer (cover): UV-resistant, weather-resistant rubber or synthetic materials (such as NBR, EPDM).

4. Environmental adaptability:
– Weather resistance: Outdoor use requires UV and ozone resistance.
– Buoyancy requirement: Whether floating hose or submerged hose is needed.
– Temperature range: Special materials required for extreme high or low temperatures.

5. Connection method:
– Flange connections: Standard flanges (such as DIN, ANSI), quick couplings (camlock).
– Custom ends: Designed according to equipment interface requirements.

6. Certification and standards:
– Compliance with industry standards: Such as ISO 4649 (abrasion testing), EN ISO 10823 (dynamic pressure testing).
– Marine engineering requires salt spray resistance and seawater corrosion resistance.

7. Brand and supplier:
– Renowned brands: Such as Goodyear, Continental, Trelleborg, Kuri Tec, Weifang Flex, etc.
– Supplier should provide:
– Technical data sheet (including pressure, bend radius, abrasion data).
– Case references (similar project experience).
– After-sales support (such as replacement, maintenance services).

8. Cost and lifespan trade-off:
– High-abrasion, high-pressure hoses have higher initial costs but reduce replacement frequency over time.
– Avoid choosing hoses that do not meet the working conditions to save costs, which may lead to frequent damage.

Recommended steps:
1. Clarify requirements: medium, pressure, flow rate, environmental conditions.
2. Consult suppliers: provide details of the operating conditions to obtain customized solutions.
3. Sample testing: field trials to verify abrasion resistance and pressure resistance.
4. Compare and choose: make decisions based on overall performance, price, and service.