Internally and externally coated steel pipes have epoxy resin coating on both the inner and outer walls, resulting in a smooth surface, reduced fluid resistance, increased flow rate, no scale formation, and minimal microbial growth. Through plastic coating treatment to withstand water transportation, burial, acid, alkali, and salt corrosion, the service life of fire-fighting water supply (gas) steel pipes is significantly improved, reaching over 50 years. The pressure range of fire-fighting steel pipes is 0-2.5 MPa. Fire-fighting plastic-coated steel pipes are based on steel pipes. The outer wall uses thermosetting powder coating, offering high adhesion, impact resistance, corrosion resistance, and weather resistance. The inner wall uses high-adhesion, corrosion-resistant, food-grade thermoplastic powder coating. Internally and externally coated water supply steel pipes are manufactured using processes including sandblasting and chemical double pretreatment, preheating, internal and external plastic coating, curing, and post-treatment. They are a high-performance, cost-effective product upgraded from traditional steel-plastic pipes and galvanized steel pipes. The product has passed the national professional certification for solid fire extinguishing systems and the fire-resistant component quality inspection center.
By applying a plastic coating to steel or galvanized steel pipes for corrosion protection, the corrosion and scaling problems encountered during the burial and transportation of ordinary steel pipes are solved. This eliminates pipe blockage and spray clogging, extending the service life of the steel pipes; plastic-coated steel pipes have a service life exceeding 50 years. The powder coating for plastic-coated steel pipes incorporates flame retardants and is modified with epoxy resin powder, resulting in superior temperature resistance; it will not burn or soften even after long-term use.
Product characteristics of internally and externally coated steel pipes:
1. Hygienic, non-toxic, non-polluting, and free of microorganisms, ensuring fluid quality.
2. Resistant to chemical corrosion, soil and marine organism corrosion, and cathodic disbondment.
3. Mature, convenient, and quick installation process, similar to ordinary galvanized steel pipe connections.
4. Extremely flame-retardant, non-combustible at 300℃.
5. Smooth pipe walls, improving conveying efficiency and extending service life.
Technical parameters of hot-dip plastic-coated steel pipes:
Coating material: Modified heavy-duty anti-corrosion epoxy resin
General color: Red
Coating thickness: 250um-550um
Coating method: Internal and external spraying
Product specifications: DN15-DN1200
Ambient temperature: -30℃-80℃ (peak: 760℃); Conventional pressure: 0.1MPa-2.5MPa
Hot-dip plastic-coated steel pipes must not be violently thrown or impacted during transportation. Nylon straps should be used for lifting during loading and unloading. Hot-dip plastic-coated steel pipes should be stored indoors or in a cool, shaded place. When stored outdoors, they should be covered with a rain shelter and kept away from heat sources and fire. They must not be stored outdoors in direct sunlight or extreme cold for extended periods. They must not be mixed with toxic or harmful substances.
Precautions for hot-dip plastic-coated steel pipes: Steel pipes used for transporting hot water can also transport cold water, but steel pipes used for transporting cold water cannot transport hot water. The cross-section of the plastic-coated steel pipe must not come into contact with water. Non-plastic-lined pipe fittings must not be used in place of plastic-lined pipe fittings. Plastic-coated pipe fittings from malleable cast iron pipe fittings must not be used. Convex threaded steel flanges should have injection joints. Special transition fittings should be used for threaded connections between special transition parts and valve ports. Special rubber sealing rings should be used for connections to water supply bolts, and special rubber sealing rings should be used for grooved connections.
Post time: Mar-02-2026