Decho can produce 3LPP 3-Layer Polypropylene Coating for API 5L PSL 1 & PSL 2 Line Pipes from NPS 2" to NPS 56" (60.3mm - 1422.4mm), welcome to contact us if you have such RFQs.

Three Layer Poly Propylene (3LPP) coating 3LPP coating system is a multilayer coating composed of three functional components: a high-performance fusion-bonded epoxy (FBE), followed by a copolymer adhesive and an outer layer of Medium Density Polypropylene (MDPP) or High-Density Polypropylene (HDPP), which provides protection against external corrosion.

The codes and standards for 3LPP Coating are DIN 30678, ISO 21809-1, NFA 49-711, SHELL DEP 31.40.30.31-CSPC

DIN 30678-2013 Polypropylene coatings on steel pipes and Fittings

ISO 21809-1:2011 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)

NFA 49-711 External Coating with Three Polyproplene Layers Coating, Application by Extrusion

SHELL DEP 31.40.30.31-CSPC External Polyethylene and Polypropylene Coating for Line Pipe

Fusion Bonded Epoxy (FBE): First layer of FBE shall be 150 microns thick.

Adhesive: Second layer of extruded co-polymer adhesive, 200 microns thick.

Polypropylene (MDPP/HDPP): Third layer of extruded polypropylene (MDPP/HDPP), 1.6 – 2.95 mm thick.

Application of Coating:

Surface preparation of pipe by sandblast cleaning (SSPC-SP10/NACE No.2/ISO 8501-1 Sa 2 1/2/SIS 05 59 00)

Subsequent to pipe heating fusion epoxy powder shall be applied

Extruded adhesive shall be applied over the pipe.

Finally extruded polypropylene (MDPP or HDPP) layer shall be applied over the adhesive layer.

Total coating thickness is generally < 3.0 mm for pipe dia < 24" and 3.3 mm for pipe dia 32" & above)