Name: China Fire-rated Galvanized Steel Pipes Manufacturers Suppliers Factory - Gnee Steel
Brand: GNEE
SKU: 298083607

Fire Protection Galvanized Steel Pipe is a premium hot-dip galvanized welded steel pipe specially designed and manufactured for automatic fire sprinkler systems, fire hydrant networks, water curtain fire suppression systems, and other dedicated fire protection piping applications. Adopting high-quality carbon structural steel as base material and standardized hot-dip galvanizing technology, this product features outstanding anti-corrosion performance, stable pressure resistance, smooth inner wall, and strict compliance with international fire protection codes, making it the preferred piping solution for commercial buildings, industrial facilities, residential complexes, public infrastructure and other fire safety engineering projects worldwide.

hot-dip galvanized welded steel pipe

Hot-dip galvanized welded steel pipe

Core Product Advantages

Superior Anti-Corrosion & Long Service Life: Full-scale hot-dip galvanizing (both internal and external walls) forms a dense, uniform zinc coating that effectively resists rust, oxidation and water corrosion; eliminates pipeline blockage caused by rust scale and ensures long-term stable operation of fire protection systems.
High Pressure Resistance & Structural Safety: Strictly controlled wall thickness and welding quality meet rated pressure standards, suitable for high-pressure and temporary high-pressure fire water supply systems, with no cracking, leakage or deformation under working conditions.
Standard Compliance & Engineering Certification: Produced in accordance with international and national fire protection specifications, with complete quality inspection reports and material certificates to meet acceptance requirements of global fire protection projects.
Smooth Inner Wall & Efficient Water Flow: Flat, scale-free inner surface minimizes water flow resistance, guarantees sufficient water flow and pressure at fire sprinklers and hydrants, and meets critical fire extinguishing efficiency demands.
Flexible Connection & Easy Installation: Compatible with grooved (clamp), threaded, and flange connections, supporting fast on-site construction and reducing installation labor and time costs.

Base Material & Technical Standards

Base Material: Q235B / Q195 Carbon Structural Welded Steel Pipe

Surface Treatment: Hot-Dip Galvanized (HDG)

Executive Standards: GB/T 3091, BS EN 10255, ASTM A53, ASTM A795 (Fire Protection Special)

Application Medium: Fire Protection Water, Clean Water for Fire Fighting

Specification & Parameter Table (Standard Fire Protection Models)

Table 1: Nominal Diameter & Basic Dimension Parameters

Nominal Diameter (DN)	Outer Diameter (mm)	Standard Wall Thickness (mm)	Nominal Working Pressure (MPa)	Standard Length (m)
DN25	33.7	3.2	1.6 / 2.0	6 / 12
DN32	42.4	3.5	1.6 / 2.0	6 / 12
DN40	48.3	3.5	1.6 / 2.0	6 / 12
DN50	60.3	3.8	1.6 / 2.0 / 2.5	6 / 12
DN65	76.1	4.0	1.6 / 2.0 / 2.5	6 / 12
DN80	88.9	4.0	1.6 / 2.0 / 2.5	6 / 12
DN100	114.3	4.0 / 4.5	1.6 / 2.0 / 2.5	6 / 12
DN125	139.7	4.5	1.6 / 2.0 / 2.5	6 / 12
DN150	165.1	4.5 / 5.0	1.6 / 2.0 / 2.5	6 / 12

Note: Custom sizes (length, wall thickness, outer diameter) and pressure grades are available upon request.

Table 2: Key Performance Parameters

Performance Item	Standard Index	Test Method
Zinc Coating Thickness	≥ 85μm (average), ≥ 70μm (local)	Magnetic Thickness Gauge Test
Zinc Coating Adhesion	No peeling, flaking or falling off after bending test	Bending & Tape Adhesion Test
Hydrostatic Test Pressure	3.0MPa (hold for 5s, no leakage)	Hydraulic Pressure Testing Machine
Welding Quality	No cracks, porosity, incomplete fusion	Visual & Non-Destructive Testing
Straightness	≤ 2mm/m	Straightedge Measurement