The hose is the conveying line of the source extraction installation.

The demands placed on the suction hose are:

• wear resistance
• low weight and flexibility
• not affected by extremes of temperatures
• crushproof

When long suction hoses have to be used their diameter should progressively increase from the suction casing, with the smallest hose nearest the suction casing not exceeding 2–3 m length. Coupling is carried out with external couplings which are easy to use.