The large-diameter suction and discharge hose is composed of a multi-layer composite structure as its core, usually consisting of an inner adhesive layer, a reinforcement layer, and an outer adhesive layer. The inner rubber layer is made of synthetic materials such as natural rubber or nitrile rubber to ensure resistance to granular media such as mud and mineral sand; The reinforcement layer provides radial support through spiral steel wire or woven steel wire mesh, allowing the pipe body to withstand a working pressure of 0.6-2.5MPa; The outer adhesive layer extends its service life through a wear-resistant formula. Typical specifications range from an inner diameter of 50mm to 300mm and a length of 1m to 10m, with wall thickness up to 8-15mm depending on pressure requirements.

 

In terms of structural design, the spiral winding process combines flexibility and compression resistance of the pipe body, and the bending radius can be reduced to three times the diameter of the pipe. For negative pressure conditions, some products use a double helix steel wire structure to achieve a vacuum degree of -0.09MPa. In special application scenarios, the fabric sandwich structure enhances sealing by embedding a canvas layer, making it suitable for transporting corrosive media.

 

2、 Typical application scenarios

1. In the field of construction engineering

In the concrete pumping system, large-diameter rubber hoses, as flexible connectors, need to withstand pulse pressure and particle wear. A certain engineering case shows that the rubber hose with steel wire winding structure has a daily throughput of 800 cubic meters when transporting concrete, and the wear rate of the pipe body is reduced by 60% compared to traditional steel pipes. In the mud discharge operation, the perforated mud discharge pipe achieves uniform discharge of mud through evenly spaced holes. After optimizing the hole diameter to 40-50mm, the blockage rate decreases by 75%.

 

2. Mining and dredging engineering

In mining scenarios, rubber hoses need to cope with the impact and wear of ore particles. Experimental data shows that a reinforcement layer containing 30% steel wire content can increase the impact strength of the pipe body to 200kJ/m ². In the operation of the cutter suction dredger, the spherical joint design between the floating pipe and the shore pipe allows for a swing angle of ± 15 ° to ensure the stability of long-distance transportation.

 

3. Industrial fluid transmission

In the petrochemical industry, rubber hoses need to withstand a temperature range of -30 ℃ to 120 ℃ and acid-base corrosion. A certain refinery uses rubber hoses lined with nitrile rubber to transport diesel, and after 5000 hours of testing, the swelling rate is controlled within 2%. In mechanical manufacturing, hydraulic hoses need to meet 100000 pulse fatigue tests, and products reinforced with aramid fibers can increase the burst pressure to 40MPa.

 

3、 Selection and maintenance points

1. Parameter matching principle

Media compatibility: NBR based rubber hoses are required for transporting hydraulic oil, while EPDM formulations can be used for transporting water-based media.

Pressure adaptation: The peak pressure of the system should be lower than 80% of the nominal working pressure of the hose. For example, for a hose with a nominal pressure of 2.0MPa, the actual operating pressure should not exceed 1.6MPa.

Flow optimization: When using DN100 hose to transport clean water, it is recommended to control the flow rate at 2-4m/s. Excessive flow rate can increase pressure drop by more than 30%.

2. Installation and maintenance specifications

Bending radius: The minimum bending radius of DN200 rubber hose shall not be less than 600mm, otherwise it may cause the reinforcement layer to break.

Temperature protection: In low-temperature environments (below -20 ℃), the hose should be preheated to above 10 ℃ before operation, and in high-temperature environments (above 80 ℃), insulation sleeves should be installed.

Regular inspection: It is recommended to conduct a visual inspection every 500 working hours, with a focus on potential hazards such as rusting of the steel wire layer and cracking of the adhesive layer.