Injection Moulded Polypropylene (IMPp)

An IMPP coating is typically applied by first blast cleaning and then heating the pipe using induction heating, for instance. A layer of powdered fusion bonded epoxy (FBE) primer is then applied to the heated pipe, together with a thin adhesive layer of polypropylene, which is added during the curing time of the FBE. Exposed chamfers of factory-applied coating on the pipe are then heated. The field joint is then completely enclosed by a heavy duty, high pressure mold that defines a cavity around the uncoated ends of the pipes, which is subsequently filled with molten polypropylene. Once the polypropylene has cooled and solidified, the mold is removed leaving the field joint coating in place.