Three-layer polypropylene coating is intended for higher operating temperatures and when higher mechanical characteristics are required.
Unlike the three-layer polyethylene coating, which is intended for a pipeline operating temperature of up to 85˚C, the three-layer polypropylene coating is for an operating temperature of 0˚C to 140˚C.
Preparation of the pipe surface is performed by sandblasting to a degree of Ca 2 ½ with steel shot and angular steel granulate.
The coating consists of the following three layers:
- a layer of epoxy resin (FBE) applied electrostatically to a heated pipe at a temperature of 180˚C to 220˚C
- a layer of adhesive applied electrostatically immediately after applying the epoxy resin
- a layer of polypropylene applied by extrusion into a hose
Outer pipe diameter (D): from 88.9mm to 813mm
Coating manufacturing standard: DIN 30678, NF 49711, EN10286
Coating thickness: 1.8mm to 2.5mm depending on pipe diameter; 8mm upon customer request.
100% porosity test – test voltage 25kV
Uninsulated ends: 130mm to 150mm
Protective caps or steel rings – upon request from the customer
Pipe length: 6m to 12.2m
Each pipe is marked with a text containing the trademark and company name, dimension and quality of material and standard according to which the pipe is made, as well as the type and standard for the production of the outer coating. In the case when the pipes are packaged in packages (diameter less than 219mm), the marking text is on a label attached to each package.
