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wr@insulatedpipeline.com
wyy@insulatedpipeline.com
Published:2025-07-21 | Last Updated: 2025-07-21 Views: 5
(1) Pre-treatment: Sandblasting for rust removal to Sa2.5 grade, chemical cleaning with precise pH control, substrate roughness of 40–80 μm.
(2) Coating: Electrostatic spraying (spray gun distance from pipe: 30-50 cm), moving speed: 0.5-1.0 m/s, single layer thickness: 0.2-0.3 mm, total thickness: 0.5-3.0 mm (customizable).
(3) Curing: Thermal curing with temperature control ±5°C, epoxy adhesion ≥10 MPa, polyethylene ≥8 MPa.
| Dimension | Standard No. | Scope of Application | Key Parameters |
|---|---|---|---|
| Steel Pipe Substrate | GB/T 8162-2008 | Seamless steel tubes for structural purpose | Materials: Q235B, Q345B, etc.; Dimensional tolerance: OD ±1%, wall thickness ±10% |
| GB/T 8163-2008 | Seamless steel pipes for liquid service | Mechanical properties: tensile strength ≥375 MPa, yield strength ≥235 MPa | |
| GB/T 3087-2008 | Seamless steel tubes for low and medium pressure boiler | Chemical composition: C ≤0.25%, Mn ≤1.2% | |
| Epoxy Coating | CJ/T 120-2008 | Internal coating for water-supply, fire-fighting and mining plastic-coated steel pipes | Coating thickness: ordinary grade ≥0.25 mm, reinforced grade ≥0.40 mm; Adhesion ≥10 MPa |
| GB/T 17219-1998 | Water supply and distribution equipment and protective materials for drinking water | Hygienic performance: extract meets drinking-water standards, odorless, toxicology test passed | |
| GB/T 5135.20-2010 | Plastic-coated pipes for automatic sprinkler systems | Fire resistance: coating intact after 260 °C exposure, resistant to fire-extinguishing agents | |
| Polyethylene Coating | CJ/T 120-2008 | External coating for water-supply, fire-fighting and mining plastic-coated steel pipes | Coating thickness: ordinary grade ≥0.40 mm, reinforced grade ≥0.60 mm; Chemical resistance: acid/alkali/salt, pH 2–12 |
| GB/T 28897-2021 | Steel-plastic composite pipes for fluid service | Abrasion: wear loss ≤0.5 g/m²; Impact: no crack under 1 kg·m impact | |
| Special Environment Standards | MT/T 181-1988 | Safety performance of plastic pipes for underground coal mines | Flame retardancy: oxygen index ≥28%; Electrical conductivity: surface resistance ≤1×10⁶ Ω |
| GB/T 37594-2019 | Three-layer fusion-bonded powder external anti-corrosion UV-resistant coating for steel pipelines | UV resistance: no chalking or cracking after 1000 h xenon-arc aging | |
| Connection & Installation | T/CECS 151-2019 | Grooved-end connection pipeline engineering | Groove depth: 2.2–3.0 mm when DN ≤100 mm; Groove width: 8–10 mm |
| CECS 125:2001 | Engineering of steel-plastic composite pipeline for building water supply | Threaded connection: taper 1:16, effective length ≥12 mm; Flanged connection: gasket temp. –20 °C to 120 °C |
(1) Corrosion Resistance
Food-Grade Safety: The epoxy coating has passed the GB/T 17219 drinking water hygiene certification, with zero heavy metal leaching.
Industrial Corrosion Resistance: The polyethylene coating can withstand acidic and alkaline media with a pH range of 2-12 and resist 50% sulfuric acid solution (no peeling after 30 days).
(2) Fluid Conveyance
Internal wall friction coefficient ≤0.008 (30% lower than ordinary steel pipes), hydraulic roughness as low as 0.01 mm.
Actual testing shows a 18% reduction in pumping energy consumption (comparison data for DN500 pipeline water conveyance).
(3) Service life
In a 3.5% NaCl salt spray environment, the coating remains intact for over 30 years (verified by ASTM B117).
After 18 years of use in the humid environment of a coal mine shaft, the coating retention rate exceeds 90% (local engineering case study in Cangzhou).
(1) Municipal engineering field
Urban water supply: DN200-DN1600 main pipeline network (more than 100,000 meters used in the Cangzhou Huanghua Port water supply project).
Fire protection system: Meets GB 50974-2014 fire protection standards, with a pressure of 2.5MPa for sprinkler pipe networks.
(2) Harsh industrial environments
| Application Scenario | Technical Solution | Performance Indicator |
|---|---|---|
| Petrochemical | Three-layer PE anticorrosion + high-temperature curing | Resistant to 120 °C crude oil and H₂S corrosion |
| Mine Tailings Transport | Inner wall with silicon carbide wear-resistant layer | Wear resistance increased by 3× (drop-sand test) |
| Power Plant Desulfurization | Epoxy-modified coating | Resistant to 60 °C, 15 % dilute sulfuric acid scouring |
(3) Specialized Customized Applications
Subsea Pipelines:
Dual-layer coating structure (epoxy primer + polyethylene topcoat), passing a 3 MPa hydrostatic pressure seal test.
Cangzhou manufacturer participated in the Bohai Bay offshore platform gas supply pipeline project (single-project supply of 50,000 tons).
Extreme Cold Regions:
Incorporates -60°C low-temperature toughening agents, passing the -50°C drop weight impact test (GB/T 14152).
Applied in oil and gas gathering and transportation projects in the permafrost regions of Inner Mongolia.
Equipped with professional pipeline design personnel and skilled worker teams, continuously optimizing production processes, and emphasizing technological and product innovation.
Introducing automated production lines (such as coated steel pipe production lines and polyurethane foam machines) and testing equipment to enhance product precision and quality stability.
Adheres to industry standards such as CJ/T120-2008 “Plastic-Coated Composite Steel Pipes for Water Supply,” demonstrating technical expertise.
Obtained ISO 9001 Quality Management System, ISO 14001 Environmental Management System, and ISO 45001 Occupational Health and Safety Management System certifications.
Awarded honors such as “AAA-rated Credit Enterprise” and “Contract-abiding and Creditworthy Unit.”
Products comply with national standards (e.g., GB/T 17219 Drinking Water Hygiene Standards) and industry standards (CJ/T120-2008 Coated Composite Steel Pipes for Water Supply), with some products passing hygiene and safety performance testing.
(1) Service Response and Support Mechanism
Quick Response Commitment
24/7 Hotline Support: Dedicated after-sales team provides round-the-clock telephone support.
On-Site Service Timeliness: Within 24 hours within the province and 48 hours outside the province to arrive at the site; complex issues resolved within 48 hours.
Emergency Spare Parts Supply: During the warranty period, free spare parts are provided when repairs are not feasible, ensuring project progress is unaffected.
Warranty Period and Scope
Standard Warranty Period: Typically 3 years, calculated from the date of acceptance, covering product manufacturing, assembly, and material quality issues.
Full Lifecycle Management: Some companies offer extended warranty options, up to a maximum of 5 years.
(2) Technical Support and Training Services
Installation and Commissioning Guidance
On-Site Technical Support: Dispatch professional engineers to guide pipeline installation, connections (e.g., grooves, flanges, welding), and system commissioning to ensure compliance with standards such as GB/T 5135.20-2010.
Compatibility Verification: Mandatory use of pipes and fittings from the same manufacturer, or strict testing to ensure compatibility with third-party products.
User Capacity Building
Operational Training: Provide training on product use, maintenance, and self-diagnosis of faults, and distribute operation manuals and video tutorials.
Customized Solutions: Design application expansion services based on project requirements, such as maintenance strategies for special environments (extreme cold, corrosive media).
(3) After-Sales Maintenance and Upgrade Services
Regular Follow-Up Visits and Inspections
Annual Inspections: Conduct free annual inspections for key clients and projects, including coating integrity and connection sealing.
Health Assessment Report: Issue a report on the operational status of the pipeline system and provide optimization recommendations.
Upgrade and Renovation Support
Technical Upgrades: Provide services such as coating material upgrades and connection method optimizations based on industry trends.
Cost Transparency: Disclose renovation costs to ensure user informed consent.
(4) Service Standards and Guidelines
Code of Conduct
Civilized Service: Require technicians to wear uniform attire, behave politely, and refrain from soliciting gifts or making unreasonable demands.
Service Records: Complete the “After-Sales Service Report Form,” and users must sign a satisfaction survey form to ensure service traceability.
Compliance Assurance
Standard Compliance: Strictly adhere to standards such as GB/T 17219 (Drinking Water Hygiene) and CJ/T 120-2016 (Water Supply Coated Composite Pipes).
Third-Party Certification: Certified under ISO 9001 (Quality) and ISO 14001 (Environment) systems to enhance service credibility.
(1) What is the corrosion resistance of coated steel pipes?
Answer: Coated steel pipes are coated with epoxy resin or polyethylene, forming a dense protective layer through an electrostatic spraying process.
Epoxy coatings resist acid, alkali, and salt corrosion (pH 2-12), while polyethylene coatings resist chemical medium erosion, making them suitable for corrosive environments such as chemical plants and marine applications.
Manufacturers of coated steel pipes validate corrosion resistance through salt spray tests (1,000 hours without bubbling) and chemical immersion tests (weight loss rate ≤0.5% after 30 days).
(2) What is the service life of coated steel pipes?
Answer: Under normal conditions, the service life of coated steel pipes can exceed 30 years, which is 2-3 times longer than galvanized steel pipes. The manufacturer offers a 3-year warranty period and can extend warranty services (up to 5 years) to cover the entire lifecycle management.
(3) Do coated steel pipes meet drinking water standards?
Answer: The inner coating uses food-grade epoxy resin certified by GB/T 17219, with leachable substance testing compliant with drinking water hygiene requirements, odor-free, and toxicologically safe. The manufacturer can provide hygiene performance test reports.
(4) What are the installation methods for coated steel pipes?
Answer: They support groove-type, flange-type, and welded connections.
Groove connections require controlling the groove depth (2.2-3.0mm) and width (8-10mm); flange connections require using seals resistant to temperatures from -20°C to 120°C. The manufacturer provides installation guidance videos and on-site technical support.
(5) Can coated steel pipes be used in high-temperature environments?
Answer: Epoxy coatings have a temperature resistance range of -40°C to 120°C, while polyethylene coatings have a temperature resistance range of -40°C to 80°C. For special high-temperature applications (such as steam pipelines), custom PTFE (polytetrafluoroethylene) coatings can be provided, with a temperature resistance up to 260°C.
(6) What factors determine the price of coated steel pipes?
Answer: The price is influenced by raw materials (Q235B steel pipes, epoxy resin powder), coating thickness (0.25–3.0 mm), production process (electrostatic spraying vs. dip coating), and order volume. The manufacturer reduces unit costs through automated production lines, offering cost-effective advantages.
(7) Do coated steel pipes require regular maintenance?
Answer: It is recommended to conduct an annual coating integrity inspection (using an electric spark tester) and connection seal integrity test. Manufacturers offer free annual inspection services and provide pipeline health assessment reports.
(8) Can coated steel pipes be customized to special dimensions?
Answer: Manufacturers support non-standard customization, capable of producing steel pipes with outer diameters ranging from 219 mm to 3,620 mm and wall thicknesses from 6 mm to 30 mm, with a delivery cycle of 7 to 15 days.
(9) What are the environmental performance characteristics of coated steel pipes?
Answer: The production process uses a closed-loop spraying system, reducing VOC emissions by 80% and achieving a powder recovery rate of 95%. Waste pipes can be recycled through professional institutions, complying with ISO 14001 environmental management system requirements.
(10) How does the manufacturer ensure after-sales service?
Answer: We provide 24/7 hotline support, with on-site service within 24 hours within the province and 48 hours outside the province. During the warranty period, we offer free repairs or replacements for defective products. Additionally, customers can participate in the “Old Pipe Recycling Program” to trade in old pipes for new ones, thereby reducing costs.
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Tel：+86 15383177997
E-mail：wr@insulatedpipeline.com
E-mail：wyy@insulatedpipeline.com
Address：Chengnan Development Zone, Yanshan County, Cangzhou City, Hebei Province, China
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