Three Layer Polyethylene (3LPE) Coated Line Pipe

Three Layer Polyethylene (3LPE) Coated Line Pipe

CSC STEEL can produce 3LPE coated line pipes suitable for API 5L PSL 1 and PSL 2 line pipes, with sizes from NPS 2" to NPS 56" (60.3mm - 1422.4mm). If you have such inquiry, welcome to contact us .

Three Layer Polyethylene (3LPE) Coatings 3LPE coating systems are multi-layer coatings composed of three functional components: high-performance fused epoxy (FBE), copolymer binder and medium density polyethylene (MDPE) or an outer layer of high-density polyethylene (HDPE) to protect against external corrosion.

The specifications and standards for 3LPE coatings are:

DIN 30670-2012, CAN/CSA Z245.21, ISO 21809-1, NFA 49-710, Shell DEP 31.4030.31-CSPC

DIN 30670-2012 Polyethylene coatings on steel pipes and fittings

ISO 21809-1:2011 Oil and gas industry - External coatings of buried or underwater pipelines used in pipeline transportation systems - Part 1: Polyolefin coatings (3 layers PE and 3 layers PP)

CAN CSA Z245.21 Pipe outer polyethylene coating

NFA 49-710 External three-layer polyethylene coating, extrusion applications

SHELL DEP 31.40.30.31-CSPC Line pipe exterior polyethylene and polypropylene coating

Fused Bonded Epoxy (FBE): The first layer of FBE should be 150 microns thick.

Adhesive: Second layer of extruded copolymer adhesive, 200 microns thick.

Polyethylene (MDPE/HDPE): Third layer of extruded polyethylene (MDPE/HDPE) or polypropylene (MDPP/HDPP) with a thickness of 1.6 – 2.95 mm.

Coating application:

Pipe surface preparation by sand blast cleaning (SSPC-SP10/NACE No.2/ISO 8501-1 Sa 2 1/2/SIS 05 59 00)

After the pipe is heated and melted, it should be coated with epoxy powder

The extruded adhesive should be applied to the pipe.

Finally, a layer of extruded polyethylene (MDPE or HDPE) should be applied over the adhesive layer.

Total coating thickness is typically < 3.0 mm for pipes < 24" diameter and 3.3 mm for pipes 32" diameter and larger)