3LPETHREE LAYER POLYETHYLENE COATING

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FUSION BONDED EPOXYUsed for corrosion protection

COPOLYMER ADHESM (Intermediate layer)Used for bonding between FBE layer and PE layer

POLYETHYLENE FILM (top layer)Used for mechanical resistance to damages that may arise during handling,transportation and laying of the pipes

PRODUCT DESCRIPTION

This anti-corrosion system consists of a high performance fusion bonded epoxy (FBE)followed by a copolymer adhesive and an outer layer of polyethylene which provides

tough durable protection. 3LPE Systems provide excellent pipeline protection forsmall and large diameter pipelines with moderate to high operating temperatures.

FEATURE AI\[D BENEFITS

Long Term Corrosion Protection

- The FBE component provides excellent adhesion to steel, providing superior longterm corrosion resistance and protection of pipelines operating at moderatetemperatures.

- Excellent resistance to cathodic disbondment which reduces the total cost ofcathodic protection during the operation of the pipeline.

Engineered Solutions

- Advanced manufactuing techniques allow the 3LPE system to be customized toyour specific project

- Can be applied to pipe diameters from 60mm to l420mm- Can be applied in a wide range of thickness to cost effectively meet unique

project specifications and performance requirements.

Very Good Mechanical Protection

- The tough outer layer of PE protects pipelines during transportation andinstallation thereby reducing costly repairs while also providing added in groupedprotection against shear forces, chemicals and abrasive soil condition.

- By increasing the thickness of the PE outer layer, the 3LPE system can provide ahigh level of mechanical protection across diverse environments without requiringthe use of costlv select backfill.

APPLICATION PROCEDT]RE

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1. SURFACE PREPARATION

1.1 Bare pipes are sent for pre heating with a temperature of 100-150 degree Celsius toremove moisture. Pipes surface are also heated up to increase the efficiency of the shot

blasting process and to prevent corrosion of the pipe after shot blasting

1.2 Pipe and components shall be abrasive blast cleaned. The degree of cleanliness shallbe Sa 2%naccordance with ISO 8501-1.

1.3 Prior to abrasive blast cleaning, the steel surface shall be dry and free fromcontamination (oil, grease, temporary corrosion protection, etc.) and surface defects(sliverso laminations, etc....) detrimental to the surface or to the adhesion of the coating.The blast-cleaned surface shall have an average profile depth of 50pm to 75pm.

1.4 After blast cleaning, the surface of the pipe shall be inspected. All slivers, laminations,weld spatter and other surface imperfections made visible by the blast cleaning process

shall be removed. After removal of these defects, the residual thickness of pipe and

components shall satisfu the minimum tolerance requirements specified by the relevant

standard. All treated areas greater than 10 cm2 shall be prepared to provide a profile tosatisff the provisions of 1.1.

1.5 Pipe and components shall be maintained at least 3 oC above the dew

temperature prior to coating.

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1.6 Contaminants (e.g. residual abrasive dust) shall be removed prior to coating.Chemical treatment of the steel may be used in addition to abrasive blast cleaning, byagleement.

1.7 The temperature holding time of the pipe shall not result in oxidation of its surface,detrimental to the good quality and adhesion of the coating. At the time of application,the temperature range at the surface of the pipe to be coated shall be determined inagreement with the manufactures of the products. The temperature of the pipe shall bemonitored using suitable means in order to make sure tlat the application conditions arefully satisfied.

2. EXTERNAL COATING APPLICATION

The principle of this coating shall consist of three layers. The coating in the factory shallbe applied in accordance with the established procedure. Prior to the application the pipeshall be heated to achieve object temperature af 200-230 degree Celsius according to thematerial specification of the manufacturer.

2.lLayer IImmediately after abrasive blast cleaning and heating of the pipe, first layer shall beformed by fusion bonded epoxy powder where the epoxy powder is conveyed bycompressed air from a powder hopper to the spray guns where it is electro staticallycharged before it is sprayed onto the pipes. The dry film thickness shall be between 75

and 100 microns checked in accordance with the manufacturers recommendations.

Z.2layer2A polymer intended to provide adhesion between layers 1 and 3 and be compatible withthose layers shall form this layer by an extruder. The thickness shall be between 170 and250 microns. The thickness may be subject to agreement by the customer, and conform tomanufacturers recommendations. The thickness shall be uniform and the minimumthickness shall make it possible to satisfr the tests specified in Section 4.

2.3Layer 3

Polyethylene coating shall form this layer. Just after adhesive film, polyethylene film isapplied by other extruder to pipe surface in several overlapping form. Adhesive andpolyethylene films are pressed by silicon pressure rollers onto pipe surface to obtainuniform coating. The multiple (PE film, Adhesive film) overlapping layers to stick into acoating of minimum 1.8-3.5mm thickness in accordance with standard DIN 30670.

3. COOLING

Prpes are then transferred to water cooling section located just after extruders. Theendless polyethylene coating is separated at the pipe ends to have single pipe at thebegiruring of cooling section. Pipes are cooled to temperature below 70 degree Celsius.

4. CUT. BACK

4.1 Cut back at the endsAll pipes are cleaned for field joint welding. End cutting unit mechanically clean up thepipe ends from polyethylene. The cleaning length may vaf,y from 50mm-150mmdepending on the pipe size to be cleaned.

5. INSPECTION Ah{D TESTS

The tests and inspections below are carried out to assure the quality of coating accordingto requirements and specifi cations:

Continuous Inspection And Tests:- Surface Inspection- Thickness Test- Temperature Check- Holiday Test

Periodical lnspection And Tests:- Impact Resistance Test- Adhesion (Peeling) Resistance Test- Hardness Test- Tensile Test

6. MARKING ON COATED PIPES

Each joint of coated pipe shall be marked by the coating applicator on the outside surfaceof the coating starting a minimum of twelve (12) inches from the beveled end of the pipe.

Marking shall be stenciled on the coated pipe utilizing a waterproof permanent type paintor ink, which will not rub off when the coated pipe is handled. The marking shall belegible from a distance of five (5) to six (6) feet with letters no less than one quarter (1/4)inches high.

Marking shall be in English and in the following sequence, regardless of previousmarkings on the inside or outside surface of the bare steel pipe.

- Pipe manufacturer's name- . Pipe identification number- Outside diameter measured in inches- Wall thickness measured in inches

*Above parameters are deflned according to required coating capacity

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