3LPE/PP/FBE External Coating
Three Layer Polyethylene/Polypropylene coating systems (3LPE/PP) is a multi-layer coating composed of three functional components: a high-performance fusion bonded epoxy (FBE), a copolymer adhesive, and an outer layer of polyethylene/polypropylene for tough and durable protection.
3LPE/PP systems provide excellent pipeline protection for both 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 180-230°C as per powder manufacturer’s recommendation.
Three Layer PE/PP Coating
Layer 1: Corrosion protective layer of fusion bonded epoxy (FBE) for superior corrosion protection and strong bonding to the blasted steel surface.
Layer 2: Copolymer adhesive (Maleic anhydride grafted polyethylene compound) chemically bonds to FBE and the polyethylene top layer.
Layer 3: Physical protection layer of polyethylene/polypropylene, which bonds effectively to the copolymer adhesive.
After coating, pipes are passed through a quenching zone to bring the temperature below 80°C, ensuring smooth handling and cut back operation as per client requirements.
Pipes are tested with a Holiday detector with 25 KV voltage to detect pinholes and other various tests such as 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
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 | 3LPE /PP/ FBE |
|---|---|
| Capacity per Hour | 360 (M²) |
| Minimum Pipe Diameter | 114.3 MM (4.5") |
| Maximum Pipe Diameter | 1625.6 MM (64") |
| Minimum Pipe Length | 9.0 M (29.52') |
| Maximum Pipe Length | 12.8 M (41.98') |
Internal Coating
A spraying nozzle is used to spray the liquid epoxy inside the pipe as per the required thickness. Before applying the epoxy paint, the internal surface of the pipes is 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 5⁄8" - 64" LENGTH - 9 to 12.8 Meters 29.53 to 42 feet | INTERNAL CLEANING & SPRAY PAINTING |
