Patent ID: 8307637

Claim:
A device for purifying exhaust gases of a motor vehicle having an engine, comprising (i) a tank containing a urea solution, (ii) a pump module , (iii) a catalyser; and (iv) a single conveying pipe having a hollow interior for conveying said urea solution, said conveying pipe including (a) a heating element arranged in a helical configuration, mounted within and contacting an interior surface of said conveying pipe, the heating element being exposed within the hollow interior (b) said conveying pipe being made of a polyolefinic matrix based thermoplastic elastomer comprising polypropylene in which is intimately dispersed an elastonieric phase, and (c) wherein the conveying pipe is heated to attain a temperature of at least +5° C. for the urea solution within 10 minutes after the engine is ignited when the device has an initial temperature as cold as −35° C.