3PE coated pipe is the most advanced technology for the pipe anticorrosion. It puts together the advantage of the 2PE coating pipe and FBE coating pipe while at the same time avoids their weaknesses.  Each layer of the 3PE coated pipe has its unique function in the coating structure.
• The epoxy layer is for the main anticorrosion function. It has strong connection with the surface of the bare steel pipe, favorable cathodic disbondment property, wide temperature range (-40℃-100℃) and low water-absorbing quality.
• The adhesive layer is to connect the epoxy layer and PE layer, whose main chemical composition is polyolefin. The polyolefin’s polar functional group can generate hydrogen bond or chemical bond with epoxy group of the FBE layer, making firm connection with the bottom layer. At the same time, the polyolefin’s nonpolar ethylene has affinity interaction with the PE layer, also generating favorable adhesive property with the face layer.
• The PE layer has favorable electrical insulation property, low water-absorbing quality and strong resistance to mechanical damage. This layer mainly has function of mechanical protection and anti-corrosion.
So 3PE coated pipe is a kind of composite system of these three layers with different functions, making the whole system is with all the functions to better protect pipeline.

The advantage of the 3PE coating steel pipes
Normal bare pipe will be corroded in the severe environment and its lifetime will be reduced, making the construction and maintainance cost very high. But due to every layer of the 3PE coating system has its good performance, the 3PE coated pipe can protect the pipe in the severe environment and extend its lifetime to 30-50 years even longer. it can significantly reduces the construction and maintainance cost for the pipeline. At the same time, the 3PE coated pipe has favorable thermal insulation property, the thermal losses is just 25% of the traditional pipe, saving a lot of energy cost during operation. At last, the 3PE coated pipe can directly be laid underground or in the water even directly in the frozen earth because of its good anticorrosion property and impact resistance property in the low temperature, no need to construct ditch.

Our coated pipes are mainly used for anti corrission DIN 30670 Polyethylene Coating for Steel Pipes and Fittings, Requirements and Testing
CAN/CSA Z245.20 External Fusion Bond Epoxy Coating for Steel Pipe
CAN/CSA Z245.21 External Polyethylene Coating for Pipe
API  5L Recommended Practice for Internal Coating of Line Pipe for Non-Corrosive Gas Transmission Service.
ISO 15741 Paints and varnishes – Friction-reduction coatings for the interior of on- and offshore pipelines for non-corrosive gases
NFA 49-710 External Three-Layer Polyethylene Based Coating,Application by Extrusion
NFA 49-711 External Three-Layer Polypropylene Based Coating,Application by Extrusion
ISO/DIS 21809, Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 1: Polyolefin coatings (3- layer PE and 3- layer PP) ;Part 2: Fusion-bonded epoxy coatings;Part 3: Field joint coatings

Fusion Bonded Epoxy Coating: AWWA C213
TS 5139,
UNI 9099
Polyurethane Coating: BS 5493
Lining: AWWA C210, TS 5140

3 LPE pipe,three layer polyethylene coating steel pipe, conforming to DIN 30670 standard.

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:

Coating thickness inspection:

1) 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

2)Thickness of epoxy and adhesive shall be measured at the beginning of each shift and whenever the plant re-starts after any stoppage for compliance.

3) Coated pipes not meeting the above requirements shall be rejected.