Extruded three-layer PE/PP coated
Nowadays Ferrum S.A. is the main Polish manufacturer of the anticorrosive, extruded, three- layer, polyethylene coating on steel pipes. The coating technology allows to obtainon pipe the anticorrosive three-layer polyethylene coating which consist of:
- Epoxy layer
- Copolymer layer (bonding agent)
- Polyethylene/polypropylene layer
The coating is applied on steel pipes of diameters from 159,0 mm to 1420 mm and of 18,0 m length, its properties conform with the requirements of ISO DIS 21809-1, DIN 30670/30678, NFA 49-710, EN 10285 standard or even exceed them. The thicknesses of coating in relation with the diameter in normal and reinforced execution according to DIN 30760/30678 are given in table.
The coating manufacturing process consists of the following operations:
- The surface blast cleaning to Sa 2 1/2 acc. to ISO 8501-1,
- The electrostatic spraying of epoxy powder onto a heated pipe
- Wrapping a pipe with extruded copolymer
- Wrapping a pipe with polyethylene in continuous way
- Cooling the coating and dressing the pipe ends
An extruded polyethylene coating has higher mechanical properties in comparison with cold applied polyethylene tape coating. Anticorrosive coatings made of three-layer PE/PP are characterised by:
- High mechanical strength
- High adherence of the coating to the pipe
- Guaranteed long-lasting anticorrosive protection of underground pipelines for minimum 50 years
- 100% protection of weld zone of coated longitudiwally and spirally welded pipes
- Suitability for bending of coated steel without damaging the insulation layer.
Note: for the diameters over 1420 mm Ferrum S.A. can made coating by polyethylene tapes acc. to DIN 30672 class B30, C30 and C50.
| Coating thickness (minimum) |
Outside diameter, mm |
|||
| mm | 159 - 244,5 | 273 - 457 | 508 - 762 | 813 - 1420 |
| PE-N-n/S-n / Normal (n) | 2,0 | 2,2 | 2,5 | 3,0 |
|
PE-N-v/S-v Reinforced (n) |
2,7 | 2,9 | 3,2 | 3,7 |
3LPP
Minimum coating thickness acc.
| to DIN 30678 | from 159,0 - 250,0 | - 2,0mm |
| 273,0 - 530,0 | - 2,2mm | |
| 610,0 and more | - 2,5mm |
See also
