Internally and externally plastic-coated steel pipe manufacturers offer an upgraded alternative to conventional fire water supply pipelines, with prices comparable to ordinary galvanized pipes. This product allows users to choose from red polyethylene (PE), cross-linked polyethylene (PE-X), or epoxy resin (EP) coatings—with flame retardants added as required—for both the inner and outer walls of the steel pipe. The smooth surface reduces fluid resistance, increases flow rate, prevents scaling, and inhibits microbial growth. It addresses the issues of corrosion and scaling in buried and water-transporting ordinary fire water supply pipes, eliminating blockages in pipelines and sprinkler heads, thereby extending the service life of fire water supply transmission pipelines. The product was included as one of the pipe materials for fire sprinkler systems in the 2005 updated GB50084-5001 "Code for Design of Automatic Sprinkler Systems." Its excellent performance and ease of installation will lead to increasingly widespread use in fire protection systems.
Comparison of Performance Between Two Types of Fire Protection Pipes
I. Ordinary Galvanized Steel Pipes for Fire Water Supply
Ordinary galvanized steel pipes have poor performance in terms of corrosion resistance, scale prevention, and antimicrobial properties. Combined with the characteristics of stagnant water and sudden emergency use in fire protection systems, these pipes present several practical issues:
1. Poor corrosion resistance: Susceptible to water erosion, the inner surface easily rusts, and脫落銹層脫落極易堵塞噴淋頭；嚴(yán)重時(shí)會(huì)在較短時(shí)間內(nèi)腐蝕穿孔；
2. Poor scale resistance: Stagnant water leads to scaling, which narrows the pipe diameter and may cause blockages, reducing flow velocity and volume; scale can also clog sprinkler heads when the system is activated;
3. Poor antimicrobial performance: As there are no specific requirements for water quality in fire protection use, the water often contains numerous microorganisms that can proliferate inside the pipes, worsening water quality and causing flow obstructions or even clogging sprinkler heads;
4. Service life: The pipes have a relatively short lifespan, typically around 10 years.

Sichuan Shudi Pipe Industry Co., Ltd. is a manufacturer specializing in plastic-coated steel pipes, with over 10 years of experience in production and sales. Main products include: fire water supply plastic-coated steel pipes, internally epoxy-coated and externally polyethylene-coated composite steel pipes, internally IPN8710-coated and externally three-oil-two-cloth anti-corrosion spiral steel pipes, internally stainless steel-lined and externally plastic-coated composite steel pipes, externally galvanized and internally plastic-coated composite steel pipes, PSP steel-plastic composite pressure pipes, HDPE power conduit sleeves, and other steel-plastic composite pipes. As a source manufacturer, inquiries and price quotes are welcome. Shudi Pipe Industry is a high-quality supplier and brand of plastic-coated steel pipes in Sichuan.