Patent ID: 8038829

Claim:
A method of coating pipe having a raised weld bead on an outer circumference thereof, said weld bead projecting from the outer circumference of the pipe; said method comprising the steps of: applying a curable resin polymer to said pipe and permitting said curable resin polymer to bond to the pipe to form a cured or partially cured polymer layer thereon; while the pipe is hot, applying powder form adhesive composition on said pipe having the cured or partially cured polymer layer thereon under conditions permitting fusion of the adhesive composition into a continuous film and bonding to the cured or partially cured polymer layer; while the pipe is hot, applying powder form polyolefin on said pipe having the adhesive composition layer thereon under conditions permitting fusion of the polyolefin powder into a continuous film and bonding to the adhesive composition layer to form a powder-based polyolefin coating on the pipe; at a stage following formation of said powder-based polyolefin coating, cooling the pipe from a side distal to said powder-based polyolefin coating; applying on said pipe having said powder-based polyolefin coating thereon an outer polyolefin covering bondable to said powder-based polyolefin coating, and allowing bonding of said polyolefin covering to said powder-based polyolefin coating; allowing cooling of the pipe to ambient temperature.