Depending on the environmental circumstances, a combination of several different discharge hoses and pipes is necessary for the discharge process. There are two basic components of discharge lines in slurry transport.
- Steel pipes: can be unlined, made of various grades of steel, cast iron or aluminium for greater wear resistance, or lined with rubber. Rubber-lined pipes have considerably greater resistance to wear than unlined steel pipes, provided that the particles are neither too sharp nor too large and that the operating temperature is not too high. A steel pipe is smoother than a rubber-lined pipeline and therefore the pipeline resistance of a steel pipe is lower than the pipeline resistance of a rubber pipeline. Steel pipes are non-flexible and generally non-floating, but can be made to float with ring floats, pontoons, or they can be produced as floating pipelines with a floating body.
- Floating dredge hoses: attached to the pivot bend on a cutter suction dredger or the bow coupling on a trailing suction hopper dredger, floating hoses must be flexible and robust for the most challenging of working environments. Standard floating hoses are made of a rubber wear liner and have a flotation body around the entire length of the hose. They can be armoured with steel rings for higher wear-resistance, while still guaranteeing flexibility.
The configuration of a discharge line is project specific. A discharge line can contain floating discharge hoses, floating steel pipes, tapered hoses, connection hoses, riser hoses and sinker hoses. A simulation programme can be used to provide a dynamic analysis of the movements of the discharge line to calculate the required configurations.