Fire-Fighting Plastic-Coated Steel Pipe
Product Overview
Fire-fighting plastic-coated steel pipe is a specialized steel pipe engineered for fire protection systems, featuring a fusion-bonded thermoplastic coating on both interior and exterior surfaces. The steel substrate provides structural strength and pressure resistance, while the plastic coating—typically epoxy resin (EP) or polyethylene (PE)—delivers superior corrosion resistance, smooth water flow, and extended service life. Designed to meet stringent fire safety standards, this pipe is widely used in building sprinkler systems, fire hydrant networks, indoor fire suppression piping, and industrial fire protection infrastructure, offering a reliable and durable solution for life-safety applications.
Key Features
Dual-Layer Corrosion Protection
The fusion-bonded epoxy (FBE) inner coating ensures a smooth, non-corrosive surface that prevents scale buildup and maintains optimal water flow during critical fire events. The outer PE or epoxy coating shields the steel from soil moisture, atmospheric corrosion, and chemical exposure, extending service life beyond 50 years.
Superior Flow Performance
The plastic-lined interior achieves a Hazen-Williams C-factor of 150, significantly higher than uncoated steel (C-120) or cast iron (C-100). This translates to lower friction losses, reduced pump energy consumption, and faster water delivery when every second counts.
High-Temperature Resistance
Fire-grade epoxy coatings withstand continuous operating temperatures up to 80°C and intermittent exposure up to 95°C, maintaining coating integrity during fire suppression operations. Special intumescent coatings are available for enhanced passive fire protection.
Mechanical Strength
Manufactured from Q235B, Q345B, or 20# carbon steel, with wall thicknesses ranging from SCH 10 to SCH 40. Pressure ratings comply with GB/T 3091, ASTM A53, and EN 10255 standards, ensuring structural reliability under fire suppression pressures.
Hygienic & Clean
The non-toxic, lead-free coating prevents bacterial growth and water contamination, meeting potable water contact standards (NSF/ANSI 61, GB/T 17219) when dual-purpose fire/domestic systems are required.
Easy Installation
Threaded, grooved, or flanged end connections compatible with standard fire protection fittings. The lightweight plastic coating reduces handling weight by 5-10% compared to traditional bitumen-coated or galvanized pipes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Substrate Material | Q235B / Q345B / 20# Carbon Steel |
| Outer Coating | Fusion-Bonded Epoxy (FBE) or Polyethylene (PE), 300-600μm |
| Inner Coating | Epoxy Resin, 200-400μm |
| Nominal Diameter | DN15 - DN600 (1/2" - 24") |
| Wall Thickness | SCH 10, SCH 20, SCH 30, SCH 40 |
| Pressure Rating | 1.0 MPa - 2.5 MPa (150 psi - 360 psi) |
| Operating Temperature | -30°C to +80°C (continuous), up to +95°C (intermittent) |
| Coating Adhesion | ≥5 MPa (pull-off test per ASTM D4541) |
| Impact Resistance | ≥1.5 J/mm (ASTM G14) |
| Bending Performance | No cracking at 2° bend per diameter |
| Standards | GB/T 3091, GB 5135.20, ASTM A53, ASTM A795, EN 10255, FM Approved, UL Listed |
Applications
Building Sprinkler Systems
Indoor wet pipe, dry pipe, and pre-action sprinkler networks in commercial buildings, hospitals, schools, and high-rise residential towers. The smooth interior ensures rapid water discharge and prevents obstruction by corrosion debris.
Fire Hydrant Networks
Underground and above-ground hydrant supply lines in municipal fire protection grids. The exterior PE coating provides cathodic disbondment resistance in soil environments.
Industrial Fire Suppression
Chemical plants, oil refineries, power stations, and warehouses requiring robust fire water delivery. Chemical-resistant epoxy coatings withstand exposure to industrial atmospheres and accidental chemical splashes.
Tunnel & Transportation
Road tunnel sprinkler systems, subway fire protection networks, and airport fuel farm hydrant lines. The coating resists humidity, salt spray, and vehicle exhaust corrosion.
Marine & Offshore
Shipboard fire main systems, offshore platform fire protection piping. Special marine-grade coatings resist saltwater immersion and UV degradation.
Data Centers & Critical Facilities
Clean-agent pre-action systems and water mist suppression in server farms, laboratories, and archives where pipe corrosion could contaminate sensitive equipment.
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