FOSHAN LIAOFAN PLASTIC INDUSTRY CO., LTD.

* Anti-corrosion solution to 3LPE/3LPP Steel Piping System for onshore&offshore Natural Gas and Oil Industry
* Coating Materials for 3LPE/3LPP Steel Pipelines

As a leading, highly proven and preferred solution-provider and manufacturer of copolymer adhesive (CPA) and top coat materials for anti-corrosion of 3LPE/3LPP pipelines in Oil and Gas industry for past decade, we strive for a highly constant reliable quality and cater to customers/proprietor's demands and intrerests as top prioroty. To ensure a sustainable contribution to 3LPE/3LPP piping system for oil&gas industry, Liaofan highlights a continuous technical innovations and upgrading of product formulations up to date and build a state-of-art advanced production facility to ensure a high efficient output of necessarily quality satisfactory products and considerate service&after-sales service for building up a sustainable, healthy and profitable partnership with our customers.

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 Coating
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

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.

Hot topics
# 3LPE/3LPP
# CPA for 3LPE/3LPP
# Top Coat
# Polyethylene top coat
# Polypropylene top coat