Extruded three-layer polyethylene and polypropylene coating on steel pipes

Nowadays "FERRUM" S.A. is the main Polish manufacturer of the anticorrosive, extruded, three-layer, polyethylene/polyethylene co- ating on steel pipes. The coating technology allows to obtain the anticorrosive three-layer polyethylene/polyetylene coating, which consist of:



 

 


The coating is applied on steel pipes of diameters from 159 mm to 1420 mm and length from 6 m to 18 m. Properties of applied coatings comply with the following stan- dards:

The anticorrosive coating consists of the following layers:


3,7 mm or polypropylene layer of minimal thickness between 1,8 mm and 2,5 mm.
"FERRUM" S.A. manufactures coated steel pipes in diameter from 159 mm to 1420 mm and length from 6 m to 18 m. We provide coating services with reference to pipes delivered by our custo- mers.
 

Coating grade Coating type Coating thickness depending on the pipe outer diameter [mm]
    159 - 273 323,9 - 457 508 - 559 610 - 762 813 - 1420
Polyethylene N-n, S-n 2 2,2 2,5 2,5 3
N-v, S-v 2,7 2,9 3,2 3,2 3,7
Polypropylene standard 2 2,2 2,2 2,5 2,5


Note: for the diameters over 1420 mm ”FERRUM” S.A. can make coating by polyethylene tapes acc. to DIN 30672 class B30, C30 and C50.

N-n, N-v coating with low density polyethylene (LDPE) or medium density polyethylene (MDPE) with regular –n and reinforced –v thickness
S-n, S-v coating with high density polyethylene (HDPE) with regular –n and reinforced –v thickness

Anticorrosive coating 3LPE/ 3LPP according to PN-EN ISO 21809-1 is composed of:

Layer thickness
 

C kg/m Klasa A1 Klasa A2 Klasa A3 Klasa B1 Klasa B2 Klasa B3 Klasa C1 Klasa C2 Klasa C3
≤15 1,8 2,1 2,6 1,3 1,8 2,3 1,3 1,7 2,1
15≤ C ≤50 2,0 2,4 3,0 1,5 2,1 2,7 1,5 1,9 2,4
50≤ C ≤130 2,4 2,8 3,5 1,8 2,5 3,1 1,8 2,3 2,8
130≤ C ≤300 2,6 3,2 3,9 2,2 2,8 3,5 2,2 2,5 3,2
300 < C 3,2 3,8 4,7 2,5 3,3 4,2 2,5 3,0 3,8


The coating manufacturing process consists of the following operations:


An extruded polyethylene coating has higher mechanical properties in comparison with cold applied polyethylene tape coating. Anticor- rosive coatings made of three-layer PE/PP are characterized by:

See also