Dual Layer FBE Coatings were introduced in the early 1990s as an alternative to liquid over-coating systems for directional drilling applications. Resicoat DL is designed to achieve outstanding pipeline properties, even in the most servere operating environments.
Two stand-alone FBE coatings are applied successively by electrostatic spray in one spray booth and the overspray of both layers can be recycled and sprayed between both layers. Through this the combination the resulting film performance characteristics are better than the sum of the individual coatings. The first layer Resicoat R-726 has the excellent adhesion and corrosion-resistance properties of a stand-alone FBE coating. The second layer typically is deposited during the melt stage of the first layer and the result is an intimate chemical bond between the two layers. The key to the superior properties of the Dual Layer Coating System is the specially formulated second layer.
Advantages of Dual Layer Coating Systems
- Excellent mechanical properties
- High anti-corrosion properties
- Easy application in existing coating plants
- Avoids cathodic protection shielding problem
- Total homogeneity: the same coating can be used for the entire pipeline including girth welds and any fittings
Application process for flexible and gouge system
Abrasive cleaning with steel grit/shot is required to acheive a surface purity grade of > Sa 2.5 with an anchor pattern of 50 - 100 µm (2 - 4) mils. The steel must reach a temperature of 230 - 240° C. The FBE is deposited by an electrostatic spray process. A second set of gun applies the second layer in line immediately after the first layer. The coating cures quickly and is capable of supporting the weight of the pipe within seconds of application. Once cured, the pipe is cooled for safe handling and inspection. The coated pipe is then ready installation and use.
Typical Technical Data Resicoat Dual Layer Pipe Coatings
| Test |
Standard |
Properties Gouge System |
Properties Flexible System |
| Colour |
|
green |
yellow |
| Storage stability |
|
12 months ≤ 23° C |
12 months ≤ 23° C |
| Impact resistance |
CSA 12.12 |
5 Joule |
7 Joule |
| Moisture content |
CSA 12.3 |
< 0.6 % |
< 0.6 % |
Flexibility |
CSA 12.11
-30° C |
3° |
3.6° |
Cathodic disbondment |
CSA 12.8
-1.5V, 23° C, 28 d
-1.5V, 65° C, 28 d |
4 mm
8 mm |
4 mm
8 mm |
| Gouge resistance |
NACE method |
max. 25% average depth |
max. 50 % average depth |
Downloads:
Resicoat Dual Layer Pipeline Coatings brochure
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