3LPE/PP/FBE External Coating

Three Layer Polyethylene/ Polypropylene coating Systems (3LPE/PP), a multi layer coating composed of three functional components: a high performance fusion bonded epoxy (FBE) followed by a copolymer adhesive and an outer layer of polyethylene/polypropylene which provides tough and durable protection. 3LPE/PP Systems provide excellent pipeline protection for small and large diameter pipelines with moderately high operating temperatures.

The 3-LPE/PP Coated Pipe are as Follows:

Pipes are preheated, external blasting is carried out for cleaning and roughness then inspected. In case of high salt contamination the pipes are treated with phosphoric acid and washed with high pressure DM water to neutralize the chloride contents. The pipes are loaded on coating conveyor and heated between 180-2300C or as per powder manufacturer’s recommendation.

Three Layer PE/PP Coting

Layer 1: This is the corrosion protective layer. This layer is of fusion bonded epoxy which offers very good corrosion protection. The fusion bonded epoxy has a very good bonding with the blasted steel surface.

Layer 2: This layer is the copolymer adhesive. The copolymer adhesive is a malefic anhydride grafted polyethylene compound. This material has good chemical bonding to the fusion bonded epoxy and the top layer polyethylene.

Layer 3: This layer is for physical protection and consists of polyethylene/Polypropylene. Since the copolymer adhesive and polyethylene are similar, they bond well with each other.

After coating, pipes are passed through quenching zone to bring down the temperature below 80°C for smooth handling and cut back operation as per client requirement.

Pipes are tested with Holiday detector with 25 KV voltage to detect pin holes and other various testing peel test, thickness check, impact test and lab tests etc for coated pipes and raw materials.

Corrosion Resistance :

3LPE/PP Coating prevents steel pipe from corrosion.
Excellent chemical resistance properties and resistance to cathodic disbandment.
3LPE/PP Coating has got good resistance to moisture permeability.

Mechanical Protection:

Top coat of polyethylene/polypropylene prevents abrasion and damage to fusion bonded epoxy during handling.
High Bond Strength : The external coating and epoxy is bonded firmly to the steel pipe surface and this is mean to adhesion strength (ASTM D 4541).

Applications

3LPE/PP coated steel pipes are mainly used in the following applications where the pipes are either buried or submerged:

Drinking water pipe lines, Oil and gas pipelines
In plant process water applications

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Standards and Specifications

3LPE/PP pipes are coated according to the following standards:

DIN 30670
CSA Z245.21
ISO 21809-1
Or any other International standard/client specs

Capacity/Range

Capacity per Hour	FBE/3LPE/3LPP
Minimum Pipe Diameter	360 (M2)
Maximum Pipe Diameter	114.3 MM (4.5″)
Minimum Pipe Length	1625.6 MM (64″)
Minimum Pipe Length	9.0 M (29.52′)

Internal Coating

A spraying nozzle used to spray the liquid epoxy inside the pipe as per the required thickness. Before applying the epoxy paint, internal surface of the pipes are blasted and cleaned.

Features of Internal Epoxy Coating:

Increase gas flow Excellent Corrosion Resistance High Steel Adhesion Low mechanical & abrasion Resistance High Impermeability for water / gas Low Electrical Resistance Decrease line maintenance and up keep costs

Type of Coating	Capacity	Coating
INTERNAL COATING	360 SQM/HOUR 219.1mm to 1626mm PIPE SIZE – 8″ - 64″ LENGTH – 9 to 12.8 Meters 29.53 to 42 feet	INTERNAL CLEANING & SPRAY PAINTING