Coated Steel Pipe
Professional pipe coating solutions — 3PE, FBE, Epoxy, Galvanized — for oil & gas, water supply and infrastructure pipelines.
Coating Solutions Overview
Steel pipe coatings are applied to the external and/or internal surface of a pipe to protect against corrosion caused by soil, water, chemicals, or the transported medium. The coating system is selected based on operating temperature, soil conditions, and project specification.
Three-layer polyethylene (3PE) is the most common external coating for buried oil and gas pipelines, offering superior mechanical protection and long service life. FBE is preferred for high-temperature applications. Galvanized coatings are used for structural and water supply pipes.
3PE coating service life in buried conditions
From epoxy to insulated systems for all applications
Bare pipe + coating from a single source
100% holiday test at 5kV / 10kV before shipment
Technical Specifications
Coating Type Comparison
| Coating Type | Thickness | Temp Range | Service Life | Primary Application |
|---|---|---|---|---|
| 3PE (Three-Layer PE) | 1.8–3.7mm | -40 to 80°C | 30–50 years | Buried oil/gas pipelines |
| 2PE (Two-Layer PE) | 1.2–3.0mm | -20 to 60°C | 20–35 years | Water/sewage pipelines |
| FBE (Fusion Bonded Epoxy) | 300–500μm | -30 to 90°C | 25–40 years | High-temp oil/gas lines |
| 3PP (Three-Layer PP) | 1.8–4.0mm | -20 to 110°C | 30–50 years | High-temp buried lines |
| Epoxy Lining (Internal) | 200–400μm | up to 60°C | 15–30 years | Internal corrosion protection |
| Hot-Dip Galvanized | 40–120μm | -30 to 60°C | 20–50 years | Structural / water supply |
| Bitumen / Coal Tar | 3.0–7.0mm | -10 to 60°C | 20–30 years | Water pipelines (traditional) |
* Service life depends on soil conditions, operating temperature, installation quality and maintenance.
3PE Coating Specification (DIN 30670 / ISO 21809-1)
Layer 1: FBE epoxy (100–250μm)
Layer 2: Adhesive (170–250μm)
Layer 3: Polyethylene (1.5–3.7mm)
21.3mm – 1422mm (1/2″ – 56″)
Normal: 1.8mm (OD≤114) / 2.5mm (OD≤323) / 3.0mm (OD≤508) / 3.7mm (>508mm)
-40°C to 80°C (standard PE) / up to 60°C (HDPE option)
≥100 N/cm (23°C) / ≥20 N/cm (50°C)
15kV for 3.7mm / 10kV for 2.5mm / 5kV for 1.8mm
Minimum Coating Thickness (mm) by OD
| OD (mm) | Normal | Reinforced |
|---|---|---|
| ≤114.3 | 1.8 | 2.5 |
| 114.3–323.9 | 2.5 | 3.0 |
| 323.9–508.0 | 3.0 | 3.5 |
| 508.0–762.0 | 3.5 | 4.0 |
| >762.0 | 3.7 | 4.5 |
FBE Coating Specification (CSA Z245.20 / ISO 21809-2)
Fusion Bonded Epoxy (single layer or dual layer)
21.3mm – 610mm (1/2″ – 24″)
Single: 300–500μm / Dual: 500–800μm
Up to 90°C (standard) / 110°C (high-temp grade)
≥15 MPa (ASTM D4541 pull-off test)
≤6mm radius (28 days at 65°C, 1.5V CSE)
Electrostatic spray after pipe preheating to 230–250°C
5kV DC spark test on 100% of pipe length
Galvanized Pipe Specification (ASTM A53 / BS 1387 / GB/T 3091)
| NPS (inch) | OD (mm) | Zinc Coating (g/m²) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|
| 1/2″ | 21.3 | ≥480 | 2.77–3.73 | 1.27–1.62 |
| 3/4″ | 26.7 | ≥480 | 2.87–3.91 | 1.69–2.19 |
| 1″ | 33.4 | ≥480 | 3.38–4.55 | 2.50–3.24 |
| 1-1/4″ | 42.2 | ≥480 | 3.56–4.85 | 3.39–4.47 |
| 1-1/2″ | 48.3 | ≥480 | 3.68–5.08 | 4.05–5.41 |
| 2″ | 60.3 | ≥480 | 3.91–5.54 | 5.44–7.48 |
| 2-1/2″ | 73.0 | ≥480 | 5.16–7.01 | 8.63–11.41 |
| 3″ | 88.9 | ≥480 | 5.49–7.62 | 11.29–15.27 |
| 4″ | 114.3 | ≥480 | 6.02–8.56 | 16.07–22.32 |
| 6″ | 168.3 | ≥480 | 7.11–10.97 | 28.26–42.56 |
Hot-dip galvanized per ASTM A123. Zinc coating average ≥480 g/m² (68μm), minimum ≥395 g/m² (56μm). Three-point adhesion test per ASTM A90.
Standards & Quality Testing
3PE external coating for steel pipes
2PE / adhesive coating
3PE/3PP coating (external)
Single/dual layer FBE coating
FBE coating for steel line pipe
3PE coating for steel line pipe
Liquid epoxy lining / coating
FBE internal / external coating
PE tape coating
3PE polyethylene coating (Chinese)
Three-layer PE coating (Chinese)
Galvanized pipe standard
Galvanized steel pipe
Galvanized tube (UK)
Quality Testing Checklist
Available Coating Types
We supply sub-pages with full specifications for each coating category:
3PE Coated Pipe
Three-layer polyethylene — the standard for buried oil & gas pipelines. Service temp -40°C to 80°C, service life 30–50 years.
FBE Coated Pipe
Fusion Bonded Epoxy for high-temperature and high-pressure pipelines. Excellent chemical resistance, 300–500μm thickness.
Galvanized Steel Pipe
Hot-dip galvanized with zinc coating ≥480 g/m². For water supply, scaffolding, fencing, and structural applications.
3PP Coated Pipe
Three-layer polypropylene — offshore and high-temperature pipelines up to 110 deg C. Deepwater-ready per DIN 30678 / ISO 21809-1.
PU Foam Insulated Pipe
Factory-bonded steel + PU foam + HDPE jacket per EN 253 — district heating and cooling networks up to 120 deg C.
Cement Mortar Lined Pipe
Centrifugal cement-mortar internal lining per AWWA C205 / BS 534 — passive protection for drinking water, sewage and seawater mains.
Concrete Weight Coated Pipe
Reinforced concrete overcoat (35–180 mm) over FBE / 3PE / 3PP — negative buoyancy for subsea lines per ISO 21809-5.
Applications
Where our products deliver proven performance across industries worldwide.
Anti-Corrosion Buried Pipelines
FBE, 3PE, and 3PP coatings protect buried oil, gas, and water trunk lines for 30–50 years — the primary defense against soil corrosion combined with cathodic protection.
✓ FBE / 3PE / 3PP systems
Offshore & Subsea Pipelines
Higher-temperature and abrasion-resistant systems (3PP, dual-FBE, concrete weight coating) serve subsea lines, landfalls, and buried marine approaches.
✓ Temperature-rated systems
Water & Sewage Pipelines
Internal cement mortar and epoxy linings plus external PE coatings protect water transmission and sewage force mains from internal and external attack.
✓ Cement lining / liquid epoxy
High-Temperature Service Lines
3PP and HT-FBE systems carry hot crude, steam, and geothermal fluids at 100–140°C where standard PE coatings fail.
✓ Up to 110°C continuous
Abrasive & Slurry Service
Dual-FBE and thick polyolefin systems resist mechanical damage in rocky backfill, HDD crossings, and abrasive slurry transport.
✓ 2FBE / reinforced 3PE
Field Joints & Pipeline Rehabilitation
Coated field joint systems, repair wraps, and re-coating services keep the whole pipeline continuous — straight pipe, bends, fittings, and joints alike.
✓ Full system compatibility
Frequently Asked Questions
What coating systems do you offer on steel pipe?＋
FBE (single/dual), 3PE, 3PP, liquid epoxy, cement mortar lining, galvanizing, and concrete weight coating — applied in-house with single-source quality control.
Which coating should I choose for my pipeline?＋
3PE for buried onshore pipelines up to 80°C; 3PP for 80–110°C and offshore/abrasive service; FBE for thin-film needs (HDD, reeling) and water lines; dual-FBE for rocky backfill. Our comparison section details the trade-offs.
What standards do your coatings comply with?＋
ISO 21809-1/-2, DIN 30670/30678, CSA Z245.20/-21, AWWA C213, NACE RP0394, and SY/T equivalents, with full QC documentation.
What is the expected service life of coated pipe?＋
Properly applied and handled, modern coating systems provide 30–50+ years of protection in buried and submerged service.
How is coating quality tested on each pipe?＋
100% holiday (spark) detection, thickness measurement at multiple points, visual inspection on every joint; peel strength, cathodic disbondment, impact and bend tests per lot.
What pipe sizes can you coat?＋
Typically 33.4 mm to 1820 mm (1"–72") diameter, applying to seamless, ERW, LSAW, and SSAW pipes in any grade.
Can you coat customer-supplied pipe?＋
Yes — toll coating services are available subject to incoming pipe inspection (surface condition, ovality, chemistry certificates).
What is the minimum order quantity and lead time?＋
MOQ typically 50 tons per size; lead time depends on diameter and coating system — usually 3–8 weeks. Contact us for a firm quotation.
How should coated pipe be handled during transport and installation?＋
Use soft slings and padded supports, keep end caps fitted, avoid dragging; repair holidays with compatible two-part liquid epoxy patch kits before backfilling.
What documentation do you provide?＋
Coating QC reports per joint (thickness, holiday, visual), peel/CD/impact batch results, and coating material certificates; third-party inspection on request.
Need Coated Steel Pipes?
Tell us your project requirements and get a comprehensive quote covering pipe specification, coating type, and delivery schedule.
✉ [email protected] | 📞 +86 15602135951 | WhatsApp Available