In order to provide a totally compatible field joint coating system for 3 Layer Polypropylene or Polyethylene coated pipelines, we have refined the process of applying PP or PE powder by the flame spray technique.
Powder is carried in a stream of air and is fed into the centre of an annular combustion flame where it is heated. A second outer annular nozzle feeds a stream of air, around the powder stream which accelerates the spray particles towards the substrate and prevents burning of the powder.
The system uses existing equipment for abrasive blasting/surface preparation and application of fusion bonded epoxy (FBE) plus chemically modified polypropylene or polyethylene (CMPP or CMPE) dual-powder base layers. The overall thickness required is then achieved by applying powder by a flame-spray gun.
The flame-spray field joint coating system provides a full 3-layer system, which is highly adjustable to field conditions where coating thicknesses of up to 5mm are required.
The flame-spray system can also provide a useful service for tie-ins or as a back-up for PIH polypropylene or polyethylene Fused Field Joint system as well as being a thoroughbred field joint coating system in itself.
The system has an extensive track record of use on overland and offshore pipelines, as well as in spoolbases.