Frp Connecting Pipe

Product Characteristics

1. Corrosion resistance and long service life
   • Fiberglass Reinforced Plastic (FRP) possesses exceptional chemical corrosion resistance. Its pipeline products are suitable for conveying various media such as acids, alkalis, salts, and organic solvents. No additional anti-corrosion treatment is required on the inner or outer walls of the pipes, resulting in low maintenance costs.
2. Light weight and excellent physical and mechanical properties
   • The specific gravity of FRP pipes typically ranges from 1.8 to 2.1 g/cm³, making their weight approximately one-fourth that of steel pipes and one-eighth that of concrete pipes. Their mechanical properties, particularly specific strength, surpass those of steel, cast iron, and plastics. Additionally, FRP pipes exhibit excellent physical characteristics: their thermal expansion coefficient is largely comparable to that of steel, while their thermal conductivity is only 0.5% of steel's, making them exceptional thermal and electrical insulators.
3. Smooth inner wall, excellent hydraulic characteristics
   • The inner surface of FRP pipes is exceptionally smooth, with a typical surface roughness coefficient of 0.008, making it nearly "hydraulically smooth." During operation, materials such as steel pipes, cast iron pipes, and concrete pipes often experience localized corrosion, leading to progressively rougher inner surfaces. In contrast, FRP pipes minimize the buildup of deposits and maintain the smoothness of a new pipe surface over time.
   • The excellent hydraulic properties of FRP pipes result in minimal fluid head loss, allowing for the selection of smaller pipe diameters or lower-power pumps. This reduces initial pipeline construction costs, conserves electrical energy, and lowers operational expenses.
4. Precision sealability
   • Sealed with rubber rings.
   • The highly sealed bell-and-spigot joint ensures no leakage.
   • Easy installation reduces setup time.
   • It can accommodate minor directional changes or foundation settlement without requiring additional fittings.
5. Design is flexible and the modification cycle is short
   • FRP pipes are fabricated by winding fiber-reinforced materials impregnated with resin matrix layer by layer under specific process conditions, followed by appropriate curing. The pipe wall exhibits a layered structure, allowing the physical and chemical properties of FRP pipes to be tailored by modifying the resin system or employing different reinforcing materials. This adaptability enables the production of FRP pipes with varying pressure ratings or specific performance characteristics to suit different media and operating conditions. A short modification cycle is a distinctive advantage of fiber-wound composites, a feature unmatched by isotropic metallic pipes.
6. Wide application field
   • Chemical Media Transmission Pipes
   • Small Hydropower Plant Penstocks & Power Plant Circulating Water Pipes (Above Ground)
   • Sewage Collection and Transmission Pipelines
   • Main Water Transmission & Distribution Pipes for Potable Water; Oilfield Water Injection & Crude Oil Transmission Pipes; Thermal Energy Transmission Pipes; Seawater Transmission Pipes
   • Agricultural Irrigation Pipes
   • FRP Equipment (Ventilation & Air Conditioning, Chimneys, Scrubbers, etc.) and Associated Piping
   • Various Process Pipes (Chemical, Papermaking, Wastewater Treatment, Seawater Desalination, Food & Beverage Processing, Pharmaceutical Processes, etc.)

Pipe Performance

1. UV Resistance 
   Ultraviolet (UV) radiation can alter the color of the external surface of FRP pipes, but there is no evidence to suggest that UV exposure degrades the long‑term performance of the pipes. Typically, two solutions are adopted:
   • Post‑Installation Painting: The pipeline installation contractor applies paint to the exterior surfaces exposed to UV radiation after installation. This method generally provides protection for 2–3 years, after which repainting is required for maintenance.
   • Factory‑Applied Anti‑Aging Layer: During manufacturing, a protective anti‑aging layer is integrated into the external surface of the pipes at the factory. These measures help mitigate superficial UV effects while ensuring the structural and functional integrity of FRP pipes over time.
2. Flow Velocity
   • The maximum recommended flow velocity is 3.0 meters per second. If the transported water is clean and does not contain abrasive substances such as sand, which could cause wear on the inner pipe wall, the flow velocity can be increased to 4.0 meters per second.
3. Hydraulic coefficient
   • Manning coefficient n=0.009
   • Colebrook‑White coefficient k=0.029mm
   • Hazen‑Williams coefficient C=150
4. Operating temperature and service life
   • Regular FRP pipelines have a working temperature range of -40℃ to 80℃. Specially formulated pipelines can withstand high temperatures up to 150℃ and have a service life of over 50 years.