| abstract |
flexible tube with multilayer structure, its use and process for heating it. the present invention relates to a flexible tube with a multilayer structure, which contains the following layers from the inside out: an internal coating, at least two layers of metal reinforcement as well as an external coating, is characterized by the fact that between two reinforcement layers is a layer of an electrically conductive plastic moldable mass, which is in electrical contact with both reinforcement layers, and both reinforcement layers can be connected to an electric current source. thus the tube can be effectively heated, so that it can be used in the production of oil in cold regions. |