Product Description

Manufactured by applying three-layer polyethylene coating (fusion bonded epoxy + copolymer adhesive + polyethylene) onto the external surface of steel pipe. Features excellent corrosion resistance, high mechanical strength, good cathodic disbondment resistance, and long service life in aggressive environments. Available base pipe materials: carbon steel (API 5L Gr B, X42–X80, ASTM A106 Gr B, Q235B, Q355B), and alloy steel. Base pipe type: seamless, ERW, LSAW, or SSAW. Coating structure (3PE): bottom layer FBE (150–300µm), middle layer copolymer adhesive (150–250µm), top layer polyethylene (1.5–4.0mm). Total coating thickness: 1.8–4.5mm (standard). Pipe outer diameter: 21.3mm – 3048mm. Wall thickness: 2.0–60mm. Length: 6m, 12m, custom. End treatment: cut-back (bare pipe length 50–150mm at each end for field welding). Coating color: black, dark green, or custom. Application temperature range: -40°C to +80°C. Coating adhesion: ≥ 100 N/cm. Test methods: holiday (porosity) test with 15kV spark, peel strength test. Meets DIN 30670, ISO 21809-1, or GB/T 23257 standards. Custom coating thickness, cut-back length, and joint coating materials available.

Parameter

Product Name	3PE Coated Steel Pipe (Polyethylene Coated Steel Pipe)
Base Pipe Materials	Carbon steel: API 5L Gr B, X42, X46, X52, X56, X60, X65, X70, X80; ASTM A106 Gr B; Q235B, Q355B; alloy steel available
Base Pipe Type	Seamless, ERW, LSAW, SSAW (as per pipe specification)
Pipe Outer Diameter	21.3 mm – 3048 mm (0.84" – 120")
Wall Thickness	2.0 mm – 60 mm (depending on diameter and grade)
Standard Length	6 m, 12 m (custom up to 18 m)
Coating Structure	3-layer: FBE (Epoxy) + Copolymer Adhesive + Polyethylene (PE)
FBE Layer Thickness	150 – 300 µm
Adhesive Layer Thickness	150 – 250 µm
PE Top Layer Thickness	1.5 mm – 4.0 mm (standard: 2.0 mm, 2.5 mm, 3.0 mm)
Total Coating Thickness	1.8 mm – 4.5 mm (depends on PE layer)
Coating Color	Black, dark green, or custom (RAL)
End Treatment	Cut-back (bare pipe ends 50 – 150 mm for field welding)
Coating Adhesion (FBE/steel)	≥ 100 N/cm (peel strength)
Holiday Test (Porosity)	15 kV spark test, zero holidays
Service Temperature	-40°C to +80°C
Cathodic Disbondment	≤ 8 mm (28 days, 65°C)
Impact Resistance	≥ 20 J/mm (depending on coating thickness)
Standards Compliance	DIN 30670, ISO 21809-1, GB/T 23257
Custom Options	Coating thickness, cut-back length, special colors, joint coating materials (heat shrink sleeves)

Application description

Widely used in long-distance oil and gas transmission pipelines, water supply and sewerage systems, chemical plants, and underground or subsea utility lines. Also suitable for pipeline rehabilitation projects and corrosive soil environments. The three-layer polyethylene coating provides exceptional protection against corrosion, mechanical damage, and cathodic disbondment, ensuring extended service life in harsh buried and submerged conditions.

Production description

Base steel pipe is cleaned by shot blasting (Sa 2.5 grade). FBE powder is electrostatically sprayed onto heated pipe (200-250°C). Copolymer adhesive is then applied, followed by extruded polyethylene outer layer. The coated pipe is water-cooled, inspected for porosity (spark test), and ends cut back for field welding.

Shipping Packaging

For export, 3PE coated steel pipes are fitted with plastic end caps, bundled with steel straps and wooden separators, packed on steel skids or ISPM-15 pallets, and secured with edge protectors. Coated surfaces are wrapped with foam or polyethylene film to prevent scratches. Labels include base pipe grade, coating thickness, dimensions, and heat number.

Why Choose Us?

1.Factory Strength: Direct manufacturer with integrated shot blasting, FBE spraying, adhesive coating, and PE extrusion lines, producing 3PE coated pipes for base pipe diameters 21.3-3048mm to DIN 30670, ISO 21809-1, and GB/T 23257 standards.

2.Quality Assurance: Strict control of coating adhesion (≥100 N/cm), holiday-free (15kV spark test), cathodic disbondment (≤8mm), and impact resistance; 100% thickness and porosity inspection; compliant with international coating specifications.

3.Certifications & Reports: Mill test certificates for base pipe and coating materials with each shipment; third-party inspections (SGS, BV) and coating test reports (adhesion, thickness, hardness, porosity) available upon request.

4.Customization & Service: Wide base pipe grades (API 5L Gr B-X80, ASTM A106, Q235B/Q355B), diameters 21.3-3048mm, coating thickness 1.8-4.5mm, cut-back length custom, and joint coating accessories (heat shrink sleeves) supplied with fast lead times.

5.Export Packaging: Plastic end caps + foam/polyethylene outer wrap + wooden separators + steel strapping + steel skids/ISPM-15 pallets + edge protectors + clear labeling for safe sea freight and coating protection.

FAQ

1. How to store 3PE coated steel pipes to prevent coating damage?

Store on dry, level ground on wooden sleepers or padded supports, keep pipes elevated and bundled with soft separators. Do not roll bare coated pipes over sharp rocks or steel. Avoid dropping or dragging pipes. For outdoor storage, cover with UV-protective tarpaulin. Minor coating scratches should be repaired with heat shrink patches or epoxy repair kits.

2. What is the recommended cut-back length for field welding?

Standard cut-back length is 100-150mm of bare pipe at each end (coating removed). This allows welding of joints without damaging the coating. Shorter cut-back (50-80mm) may be used for smaller diameters. After welding and NDT, the field joint is coated with heat shrink sleeves or liquid epoxy to match the 3PE system. We supply compatible joint coating materials.

3. What is the difference between 3PE and FBE coated pipes?

3PE (three-layer polyethylene) combines FBE primer for adhesion, copolymer adhesive, and a thick polyethylene outer layer for mechanical protection and cathodic disbondment resistance. It is thicker (1.8-4.5mm) and ideal for buried pipelines where rock impact or high abrasion is expected. FBE (fusion bonded epoxy) is a single layer (300-600µm) providing excellent corrosion resistance but less mechanical protection, suitable for less abrasive soils or above-ground service where impact risk is low.

CLIENT FEEDBACK

Has a professional foreign trade team and a well-established export service system. We have built long-term and stable cooperation relationships with customers from Southeast Asia, the Middle East, Africa, South America, and other regions.

CUSTOMER VISIT

We sincerely welcome global partners to contact us for mutual growth. With high-quality products and professional service, we look forward to working with you to create a prosperous future together.

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