EN-PN ISO 21809 Coated Stainless Steel Tubing DIN 30672 Class B30 Grade

Product Name : EN-PN ISO 21809 3pe coating steel pipes ?the definition of anticorrosive steel pipes

Best Pipeline is the main 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:

· epoxy layer,

· copolymer layer (bonding agent),

· polyethylene/polypropylene layer.

 

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:

· EN-PN ISO 21809,

· DIN 30670,

· DIN 30678,

· NFA 49-710,

· EN-PN 10285.

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:

· high mechanical strength,

· high adherence of the coating to the pipe,

· guaranteedlong-lastinganticorrosiveprotectionofundergroundpipelines for minimum 50 years,

· 100% protection of weld zone of coated longitudinally and spirally welded pipes,

· suitability for bending of coated steel without damaging the insulation layer.

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

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:

· 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/polyetylene in continuous way,

· cooling the coating and dressing the pipe ends.