Suction Hose

Suction and discharge rubber hoses are mainly used in water conservancy dredging and waterway engineering, municipal and industrial drainage, mining and tunnel engineering, agriculture and infrastructure. These applications require large volume transfer of fluid or semi-fluid materials in very short time, so suction and discharge hoses are generally large diameter, usually ranging from 38mm to 1200mm or even larger, with common specifications are above 102mm (4 inches). 

Suction and discharge rubber hose always made of 3 layers structure:

• Inner Rubber Layer: Due to the direct contact with the transport medium, inner rubber layer requires extremely high wear and corrosion resistance property. It usually takes natural rubber, styrene-butadiene rubber or nitrile rubber. Polyurethane (with 3-5 times wear resistance improvement ) or ethylene propylene diene monomer (EPDM) rubber (resistant to acids and alkalis, and weathering) will be taken under special working condition.
•  Middle Reinforcement Layer: as the mainly pressure bearing structure, reinforcement layer is usually made of multi-layer high-strength synthetic fiber fabric and spiral metal wire. This structure ensures both positive pressure during discharge and negative pressure (vacuum) during suction, and maintain its shape not change.
• Outer Rubber Layer: It’s function is to protect the inner structure layer from being damaged by external environment (sunlight, ozone, seawater, and friction erosion), for this reason, aging-resistant synthetic rubber is usually used.

The design of suction and discharge hose needs to withstand both positive and negative pressure, that is, suction and discharge. They need to withstand both the pressure of discharge (positive pressure) and the negative pressure of suction to prevent them from being sucked flat. Depending on different transporting medium, suction and discharge hose can be classified as: mud suction and discharge hose, water suction and discharge hose, oil resistant hose, acid and alkali resistant hose, wear resistant hose, and high temperature resistant hose.