What’s The Specification For The Thickness Of 3LPE Coating?

3 LPE pipe,three layer polyethylene coating steel pipe, conforming to DIN 30670 standard, including epoxy powder coating,  copolymer adhesive and top pe layer coating.

This anti-corrosive coating consists of the following layers

Layer1:Fusion Bonded Epoxy. This later provides protection against corrosion and is fusion bonded with the blasted steel surface.;

Layer 2:Copolymer adhesive which has excellent chemical bonding to the inner layer and the top layer of polyethylene;

Layer 3:Polyethylene layer used for protection against any physical damage of the pipes.

 

Layer1 of minimal thickness of 80 µm,layer2 of minimal thickness of 250 µm,Then What’s the specification for the thickness of 3LPE coating?

Minimum total thickness of polyethylene coating shall be as below:

Pipe diameter DN	Epoxy powder coating μm	Adhesive coating μm	Minimum   Total Coating Thickness
			Normal   type	Reinforced type
DN≤100	≥120	≥170	1.8	2.5
100<DN≤250			2.0	2.7
250<DN<500			2.2	2.9
500≤DN<800	≥150		2.5	3.2
800≤DN≤1200			3.0	3.7
DN>1200			3.3	4.2

The coating thickness shall be determined by taking at least 10 measurements at locations uniformly distributed over the length and periphery of each pipe. In case of welded pipes,five of the above readings shall be made at the apex of the weld seam, uniformly distributed over the length of the coated pipe. All readings must meet the minimum requirements.However, localized coating thickness of less than the permissible minimum thickness can be tolerated on the condition that it does not attain a total extent of more than 5㎝²per meter length of coated pipe, and the actual coating thickness does not drop more than 10% below the permissible minimum coating thickness at these locations