Multi-layer coated steel pipe comprising an adnesive or epoxy layer

A multi layer coated steel pipe, comprising:

• a. an inner steel pipe;
• b. a first layer of coating, which is an anti-corrosion coating;
• c. a second layer of coating, comprising a thermoplastic selected from the group consisting of polyphenylene sulfide, polypropylene, and polystyrene;
• d. an epoxy intermediate layer between the second layer of coating and a third layer of coating;
• and
• e. the third layer of coating, which comprises a thermoplastic selected from the group consisting of polyphenylene sulfide, polypropylene and polystyrene;
• wherein the second layer of coating and the third layer of coating comprise different thermoplastics.

A method of manufacturing a multi layered coated steel pipe section, comprising:

• a. displacing a steel pipe section longitudinally through a coating apparatus;
• b. applying a first layer of circumferential coating onto said steel pipe section;
• c. applying a second layer of circumferential coating, comprising a thermoplastic selected from the group consisting of polyphenylene sulfide, polypropylene, and polystyrene, onto said first layer of circumferential coating by said coating apparatus;
• d. applying an epoxy layer onto said second layer of circumferential coating;
• e. applying a third layer of circumferential coating, comprising a thermoplastic selected from the group consisting of polyphenylene sulfide, polypropylene and polystyrene, onto said fusion bonded epoxy layer;
• wherein the first layer and the third layer comprise different thermoplastics.

The method of claim 8, wherein:

• the application of the epoxy layer is performed by the coating apparatus;
• and/or the application of the third layer of circumferential coating is performed by the coating apparatus;
• and/or
• the application of one or more of the first, second, and third tie layers is performed by the coating apparatus.