External Three-Layer Polypropylene Coating

Three-layered polypropylene coating is designed for higher operating temperatures and requirements higher mechanical properties.

Unlike three-layered polyethylene coating which is designed for the pipeline operating temperature up to 85˚C, three-layered polypropylene coating is used when working temperature is from 0˚C to 140˚C.

Preparing the surface of the tube is performed by grit/shot  blasting to the ensure Sa 2½ degree of cleanliness (with a steel shot and steel grit).

Coating consists of three layers:

  • Layer of epoxy resin (FBE) electrostatic applied to the heated pipe at a temperature of 180˚C to 220˚C,
  • layer of adhesive electrostatic applied immediately after application of epoxy resin and
  • polypropylene coating applied by sleeve extrusion.

Outside diameter of pipe (D): from 88.9 mm to 813m

Standard for coating application: DIN 30678, NF 49711, EN10286

Coating thickness: 1.8 mm to 2.5 mm depending on a diameter of pipe, up to 8mm at the request of customer.

100% porosity test – test voltage 25 kV

Cut back: 130mm to 150mm

Protective caps or steel rings – at the request of the customer

Pipe Length: 6 meters to 12.2 meters

Each pipe has written text that contains a trademark and company name, size and quality of materials, the standard by which the pipe is made and the type and standard of making the external coating. When pipes are packaged in bundles (diameter less than 219mm), marking text is on the label fixed to each package.