First, the core performance advantages of plastic-coated steel pipes
(I) Super corrosion resistance system: Plastic-coated steel pipes use hot-melt epoxy/polyethylene composite coatings to form a three-layer protective structure (primer + adhesive layer + surface layer), and the acid, alkali, and salt corrosion resistance meets the ASTM G31 standard. In a chemical sewage environment with a pH value of 2-12 and a chloride ion concentration of 5000mg/L, the annual corrosion rate is ≤0.05mm and the service life is more than 3 times that of ordinary steel pipes. An application case in a chemical park shows that the pipeline replacement cycle after use is extended from 12 months to 60 months, and the maintenance cost is reduced by 65%.
(II) Outstanding mechanical properties: The base steel pipe uses Q355B grade steel with a yield strength of ≥355MPa and a ring stiffness of ≥12.5kN/m². According to third-party testing, DN800 plastic-coated steel pipes can withstand a working pressure of 2.5MPa and an axial compressive strength of 480MPa, meeting the dynamic load requirements of 10-ton vehicles on municipal roads. An underground pipe gallery project in Shenzhen successfully resisted a 6.8-level mechanical impact without structural damage.
(III) Optimization of hydraulic characteristics: The inner wall roughness coefficient n=0.008 (ordinary steel pipe n=0.012), the same pipe diameter conveying capacity increased by 18%. According to calculations, the full pipe flow velocity of DN600 pipe can reach 1.8m/s at a slope of 0.5%, which saves 23% of energy compared with traditional pipes. Application data of Shanghai Bailonggang Sewage Treatment Plant shows that the scaling rate is reduced to 0.3mm/year, and it can be operated without cleaning for five years.
(IV) Biological control technology: The coating is added with nano-silver/zinc oxide composite antibacterial agent, the antibacterial rate is greater than 99.9%, and the biofilm formation inhibition rate is 85%. In the pharmaceutical wastewater treatment system, the survival rate of pathogenic bacteria such as Escherichia coli is reduced by 3 orders of magnitude, and the effluent water quality is stable and reaches the GB 18918-2002 Class A standard.
Second, the engineering adaptation system of plastic-coated steel pipes
(I) Specification parameter matrix
The recommended specifications of municipal trunk pipe networks are DN800-DN1660 and the technical parameters require a ring stiffness of ≥12.5kN/m².
Recommended specifications of industrial wastewater pipes DN300-DN600 and technical parameters require temperature resistance of -20℃~80℃
Recommended specifications of building water systems DN50-DN150 and technical parameters require working pressure 1.0-1.6MPa
Emergency treatment facilities: customized quick-install modules and connection time ≤15 minutes/interface
(II) Intelligent installation plan
1. Connection technology selection
(1) Flange connection: suitable for DN≥400, sealing level up to EN1092-1 PN16
(2) Groove connection: construction efficiency increased by 40%, seismic performance meets GB50981 standard
(3) Hot-melt butt: weld strength ≥90% of parent material, passed ISO13953 test
2. Digital construction management: use BIM technology for pipeline pre-assembly, error control ±2mm/10m. Configure the RFID tracking system to achieve a 98% component traceability rate. A demonstration project application shows that the construction period is shortened by 30% and the material loss rate is reduced to less than 3%.
Third, the full-cycle operation and maintenance system of plastic-coated steel pipes
(I) Intelligent monitoring network
(1) Internal detection system: deploy pipe wall thickness monitoring sensors with a resolution of 0.1mm
(2) Online water quality analysis: integrated pH, COD, turbidity multi-parameter probes, data update frequency 1 time/minute
(3) Structural health monitoring: deploy optical fiber strain sensors with a positioning accuracy of ±0.5m
(II) Preventive maintenance strategy: establish a life prediction model based on big data with an accuracy rate of >85%. Formulate three-level maintenance standards:
Level A: coating integrity ≥ 95%, annual routine inspection
Level B: coating damage 5-15%, quarterly inspection + local repair
Level C: coating damage > 15%, emergency replacement plan activated
Fourth, the technical development trend of plastic-coated steel pipes
(I) Material innovation
(1) Graphene-modified coating: thermal conductivity increased by 50%, anti-microbial adhesion performance enhanced
(2) Self-healing coating: microcapsule technology realizes automatic repair of cracks below 3mm
(3) Photocatalytic coating: TiO2 nanomaterials decompose organic pollutants with an efficiency of 90%
(II) Intelligent upgrade
(1) Digital twin system: establish a digital model of the entire life cycle of the pipeline
(2) Robot inspection: equipped with a high-definition camera and laser thickness measurement module
(3) Blockchain traceability: establish full-chain trusted data from raw materials to construction
(III) Green Manufacturing
(1) Low-temperature plastic coating process: energy consumption reduced by 40%, VOC emissions < 50mg/m³
(2) Recycling and reuse: the remanufacturing rate of old pipes reaches 70%, in line with GB/T 32877 standard
(3) Carbon footprint management: Carbon emissions throughout the entire process are reduced by 35%, and ISO14064 certification is obtained
According to industry forecasts, the market size of plastic-coated steel pipes for sewage treatment in my country will exceed 15 billion yuan in 2025, and the penetration rate in the municipal field will reach 60%. With the advancement of the “dual carbon” strategy, green and intelligent plastic-coated steel pipes will become the core material for upgrading water treatment infrastructure, supporting the urban sewage treatment rate from 97% to 100%.
Post time: Apr-30-2025