Project Description

3LPP – Three layer polypropylene

EXTERNAL COATING AND INTERNAL LINING

Three layer polypropylene - render

V.I.P. Pesaro is one of the few companies able to offer the 3LPP coating on pipes as well as on custom pieces.
The coating is a multilayer composed of a primer fusion bonded epoxy (FBE) followed by an adhesive copolymer and another layer of polypropylene which provides resistance and long-lasting protection.
The system ensures the applicability of the sintered coating also on pieces with special shapes.

Long-term anticorrosive protection
The FBE primer offers an excellent adhesion to the substrate and provides a long-term corrosion protection for pipelines operating at moderate temperatures. It also ensures resistance to cathodic disbondment so the total cost of cathodic protection of the pipeline decreases.

Very good mechanical protection
The layer of applied polypropylene protects the pipeline during transport and installation, thus reducing repair costs and guarantees underground protection against mechanical, chemical and abrasive attacks.
The thicker the applied polyethylene the higher the obtained mechanical protection.

Other advantages of the sintered system
V.I.P. using this special application technique is able to coat also specific pieces with special shapes. (bends, tees, reducers, joints, etc.).
There aren’t any limitations about the amount of pieces to coat, even the single piece can be treated.
3LPP can be applied in different thicknesses to meet the requirements of the project specifications.

3LPP triple layer polypropylene
  • Small and large pipes
  • Standard and special fittings
  • Wide radius bends
  • Flanges
  • Buckle arrestors
  • Custom pieces
  • Elongation at Break : > 600%
  • Hardness : Shore D 63
  • Minimum recommended temperature : – 20°C
  • Maximum recommended temperature : + 110°C
  • SURFACE PREPARATION : The steel surface is thoroughly cleaned and blasted.
  • FUSION BONDED EPOXY Anticorrosive coating* : The cleaned metal part is heated to the recommended  FBE powder application temperature.
  • ADHESIVE LAYER : A copolymer adhesive provides the necessary adhesion between the primer and the third layer of the coating.
  • POLYPROPYLENE – Top coat : The outer layer is made of a polyolefin protective film of Polypropylene (PP).
  • SHIPMENT PREPARATION : Final inspection is carried out in our internal laboratory when the goods are fully produced. Then packed and in all respects ready for shipment.

*Sintering is the coating process where a coating powder is sprayed on a preheated piece. Thanks to the heat emitted from the surface the powder fuses creating an homogeneous and continuous layer.

FBE (Fusion Bonded Epoxy) is the best epoxy resin powder applied on pre‐heated surfaces. Thermosetting coating designed for the anticorrosive protection of articles destined to immersion or buried services in oil and gas sector and in the protection of the water pipeline.

3LPP PROCESS

EXTERNAL COATING

INTERNAL LINING

INSPECTION AND TESTING

Property Test Description Typical Values
Degree of cure of epoxy resin ISO 21809/1 ∆Tg according to the manufacturer specifications
Impact ISO 21809/1 > 10 J/mm
Cathodic Disbondment ISO 21809/1 23°C/ 28 days or 60°C/ 2 days max 7 mm
Peel Strenght ISO 21809/1 ≥ 25 N/cm at 23°C; ≥ 4 N/cm at 90°C
Continuity (holiday detection) ISO 21809/1 10 kV/mm; max 25kV

COATING CAPACITY

Pipes:
Diameter from 1/2” to 120”
Maximum unit length 13.5 meters
Maximum unit weight 15,000 kg.
Joints and/or custom pieces: (bends, tees, reducers, flanges, etc.)
Maximum size 3.0 x 3.0 x 13.5 meters
Maximum unit weight 15,000 kg
Maximum thickness of the coating 3,5 mm

DOCUMENTATION

3LPP – Samples

PROCESS - 3LPP 3-LAYER-POLYPROPYLENE

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