Fire and corrosion protected hose

Abstract

In connection with installations comprising articles housing or conducting corroding material, or in connection with substantially pipe- or hose-shaped articles which are to be protected against fire, for example a propulsion motor in a vehicle, it is in accordance with the present invention suggested, rather than using steel pipes and/or steel containers, to use plastic articles which by nature is corrosion resistant. Plastic articles which preferably are pipeshaped (1) are insulated by means of a combination of a light thermally insulating material (2) which normally cannot stand exposure to fire (approximately 800.degree. C. and higher), and a fire resistant material (3) which is provided around said insulating material (2), and which at high temperature (approximately 800.degree. C. and higher) renders a ceramic stable fire protecting phase. Since the first layer of insulation has relatively low heat conductivity at lower temperatures, the outer layer will rapidly be brought up to the higher temperature range for the forming of a ceramic stable phase before the inner pipe or inner hose (31) is damaged by fire. Possibly, the first layer of insulation (33a) might be constituted by a foamed plastic/ceramic composition of substantially the same basic structure as the second layer (33) of the fire resistant material.

Dependencies are inferred from the claim text.