Steel-Plastic Composite Fire Protection Pipe

product details

Steel-plastic composite fire protection pipes feature a welded steel substrate lined with food-grade polyethylene or epoxy resin, bonded through thermal lamination and mechanical adhesion to prevent delamination.

The pipe combines the high strength and pressure rating of steel with the corrosion resistance and non-scaling properties of plastic, fully complying with GB 5135 fire safety standards. Heat-resistant, flame-retardant and vibration-tolerant, it is suitable for sprinkler systems, hydrant networks and fire water supply systems.

Joints utilize grooved couplings, flanges or threaded connections for fast, secure installation with zero leakage and no water contamination. Applications include high-rise building fire systems, commercial and industrial fire networks, municipal public fire protection and underground utility tunnel fire piping.

Item	Steel-Plastic Composite Fire Pipe
Material	Steel Pipe with Food-grade Lining
Standard	GB 5135
Common Size (DN/mm)	DN50 to DN300
Pressure / Stiffness	PN1.6 to PN2.5 MPa
Connection	Grooved Coupling, Flange, Threaded
Application	Building fire systems, municipal fire networks
Key Advantages	High strength, corrosion resistant, fire code compliant

Nominal Diameter (DN)	Outside Diameter (mm)	Minimum Wall Thickness (mm)	Coating Thickness (μm)	Pressure Rating (PN)	Standard Length (m)	Model Example	Application Scenarios
15	21.3	2.75	EP≥120 / PE≥400	1.6 MPa	6	SP-Fire DN15 PN1.6 EP	Sprinkler branch lines, small hose reels
20	26.9	2.75	EP≥120 / PE≥400	1.6 MPa	6	SP-Fire DN20 PN1.6 EP	Residential fire branches, cabinet lines
25	33.7	3.25	EP≥120 / PE≥400	1.6 MPa	6	SP-Fire DN25 PN1.6 EP	Indoor risers, small hydrant branches
32	42.4	3.25	EP≥120 / PE≥400	1.6 MPa	6	SP-Fire DN32 PN1.6 EP	Office risers, sprinkler mains
40	48.3	3.50	EP≥120 / PE≥400	1.6 MPa	6	SP-Fire DN40 PN1.6 EP	Commercial building branches, pump suction
50	60.3	3.50	EP≥120 / PE≥400	1.6 / 2.0 MPa	6	SP-Fire DN50 PN2.0 EP	Main risers, fire pump headers
65	76.1	3.75	EP≥120 / PE≥400	1.6 / 2.0 MPa	6 / 9	SP-Fire DN65 PN2.0 EP	Highrise risers, zone mains
80	88.9	4.00	EP≥120 / PE≥400	1.6 / 2.0 MPa	6 / 9	SP-Fire DN80 PN2.0 EP	Industrial mains, basement manifolds
100	114.3	4.50	EP≥120 / PE≥400	1.6 / 2.0 MPa	6 / 9 / 12	SP-Fire DN100 PN2.0 EP	Fire loop mains, large sprinkler systems
125	140.0	4.75	EP≥150 / PE≥500	1.6 MPa	6 / 9 / 12	SP-Fire DN125 PN1.6 EP	Campus mains, hospital fire networks
150	165.0	5.00	EP≥150 / PE≥500	1.6 MPa	6 / 9 / 12	SP-Fire DN150 PN1.6 EP	Municipal fire lines, stadium ring mains
200	219.0	6.00	EP≥200 / PE≥600	1.0 / 1.6 MPa	6 / 12	SP-Fire DN200 PN1.6 EP	Airport/port fire trunk lines

Notes on pipelines：

1. Comply with national fire safety standards GB 5135, dedicated to fire water supply systems, prohibit substitution with ordinary water supply pipes.

2. Protect the internal food-grade plastic lining during installation, avoid scratching, peeling and damage, prevent rust and water quality pollution.

3. Adopt grooved, flange or threaded connection, operate in strict accordance with fire protection construction specifications, ensure joint firmness and zero leakage.

4. Install pipe brackets and hangers at specified intervals, prevent pipeline sagging and vibration, ensure stable operation of fire protection system.

5. Avoid contact with corrosive chemicals, do not carry out welding and hot operations near the pipeline to prevent damage to the plastic lining.

6. Regularly conduct pressure tests on the fire protection pipeline system, check joint sealing and pipe body corrosion, and ensure timely water supply in case of fire.