Multiple layer pipe
AssigneeOy KWH Pipe Ab
InventorsPatrick Jannson, Charlotta Risku
Life of this patent
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Abstract
Abrasion resistant polymer pipe and a process for the production thereof. The pipe comprises a first, abrasion resistant inner layer (1) and a second, structural layer (2), which is placed on the outer side of the inner layer. The first and the second layers comprise extrudable polymer materials and they are preferably separated by an alarm layer which indicates wear or depletion of the inner layer. The pipe is suitable for use in the mining industry and generally for conducting liquid and gaseous fluids containing abrasive particles.
Claims26
Abrasion resistant polymer pipe, comprising a first, abrasion resistant inner layer (1) and a second, structural layer (2), which is placed on the outer side of the inner layer, said first and said second layers comprising extrudable polymer materials, wherein
- there is an intermediate layer (3) between the inner layer (1) and the structural layer (2), abutting with the inner layer and said intermediate layer functioning as an indicator of the wear or depletion of the inner layer, and
- the intermediate layer (3) is electrically conductive having a resistance in the conductive range.
A process of producing an abrasion resistant polymer pipe, comprising the steps of
- co-extruding at least a first layer forming the inner layer (1) of the pipe, a second layer, forming the structural layer (2) of the pipe, and a third, intermediate layer (3) between the first and the second layers (1, 2),
- said first layer being formed from a material having improved properties of abrasion resistance with respect to the corresponding properties of the material forming the second layer and said intermediate layer being formed from a polymer material which has been made permanently conductive.
Dependencies are inferred from the claim text.