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Polyolefin Coatings For Pipelines
Polyolefin coating for buried or submerged pipelines includes 3LPE and 3LPP. These external coating pipeline is used in petroleum and gas industries. Pls click here to catch more information!
Description
Description of ISO21809-1 specification
External three layer extruded polyethylene and polypropylene based coatings for corrosion protection of welded and seamless steel pipes for pipeline transportation systems in petroleum and natural gas industries.
Coating class shall be selected based on the expected field duty. The transport, handling, laying conditions, operating conditions, soil conditions and the expected environmental conditions shall be considered in the selection of the coating thickness.
Coating classes
The coating shall be capable of withstanding the temperature range required as follow shown. The coating class shall be specified in the purchase order.
Coating classes and design temperatures
|
Coating class |
A |
B |
C |
|
Top layer material |
LDPE |
MDPE/HDPE |
PP |
|
Design temperature ℃ |
-20 to +60 |
-40 to +80 |
-20 to +110 |
Coating thickness class
Coating thickness class shall be selected based on the soil or ground, laying method on land and offshore, service conditions and pipe dimensions. The coating thickness class shall be specified in the purchase order.
A function of expected field duty and pipe weight as below,
Minimum total coating thickness
|
M kg/m |
Coating thickness mm |
||||||||
|
Class A1 |
Class A2 |
Class A3 |
Class B1 |
Class B2 |
Class B3 |
Class C1 |
Class C2 |
Class C3 |
|
|
M≤15 |
1.8 |
2.1 |
2.6 |
1.3 |
1.8 |
2.3 |
1.3 |
1.7 |
2.1 |
|
15 |
2.0 |
2.4 |
3.0 |
1.5 |
2.1 |
2.7 |
1.5 |
1.9 |
2.4 |
|
50 |
2.4 |
2.8 |
3.5 |
1.8 |
2.5 |
3.1 |
1.8 |
2.3 |
2.8 |
|
130 |
2.6 |
3.2 |
3.9 |
2.2 |
2.8 |
3.5 |
2.2 |
2.5 |
3.2 |
|
300 |
3.2 |
3.8 |
4.7 |
2.5 |
3.3 |
4.2 |
2.5 |
3.0 |
3.8 |
Composition of the coating system
The coating system shall consist of three layers:
1st layer: epoxy (liquid or powder)
2nd layer: adhesive (powder sprayed or extruded)
3rd layer: PE/PP top layer (applied by extrusion)
The follow markings shall be placed on the coating
Applicator’s name or code, standard and year of publication, coating thickness class, coating thickness, design temperature for class C only. Marking shall be carried out using a method such as stencil painting or printing, to ensure legible and indelible identification.
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