FRP Grating in Sewage Treatment Plants
FRP grating (also known as FRP grating, composite grating) is a grid-like plate made of glass fiber as reinforcement material and unsaturated polyester resin as matrix through a special process. It is widely used in chemical, electric power, sewage treatment, shipbuilding, construction and other industries due to its excellent properties such as corrosion resistance, high strength, light weight, anti-slip and flame retardant.
Product specifications and services of FRP grating
The Third Sewage Treatment Plant of XX City is responsible for treating domestic sewage and industrial wastewater in the main urban area, with an average daily treatment capacity of 85,000 tons. The original carbon steel grating was severely corroded in a humid and corrosive gas environment, with the corrosion depth in some areas reaching 3mm/year, posing a safety hazard. In the 2022 renovation project, 38&50mm thick fiberglass gratings customized by our company were fully used to cover 12 key areas such as the primary sedimentation tank, aeration tank, and sludge dewatering room.
- Structural design: bidirectional reinforced grid structure
- Load rating: D400 (applicable to sewage plant maintenance vehicles)
- Temperature range: -50℃~120℃ (covering extreme working conditions)
- Anti-slip treatment: diamond anti-slip layer
- Corrosion resistance: passed ISO 10952 standard test
Specific Application Scenarios and Solutions
- Inspection channel of primary sedimentation tank
Pain point: hydrogen sulfide gas corrosion + algae attachment
Solution: Use 38mm grille with 40% opening rate and add diversion groove at the bottom
Effect: Inspection efficiency increased by 60%, and maintenance cycle extended to 8 years - Aeration tank equipment platform
Renovation focus: mechanical vibration resistance + water vapor erosion resistance
Technical innovation: embedded bolt fixing + U-shaped edging treatment
Data comparison: vibration deformation reduced by 83% - Sludge dewatering room operation area
Special needs: organic solvent tolerance + heavy load protection
Customized solution: 3-layer glass fiber cloth reinforced structure - Customer feedback: load-bearing capacity of 6 tons/m²
Comparative Data of FRP Grating and Traditional Materials
| Item | FRP Grating | Carbon steel grating | Stainless Steel Grating |
|---|---|---|---|
| Annual corrosion rate | <0.01mm | 1.2-3mm | 0.1-0.3mm |
| Comprehensive cost (15 years) | ¥580/m² | ¥920/m² | ¥1500/m² |
| Installation efficiency | 3person/100m² | 5 person/100m² | 4 person/100m² |
| Insulation performance | 10^12Ω·cm | Conductive | Conductive |
The production of FRP grating mainly adopts the following processes:
Molding: After mixing glass fiber and resin, put them into the mold for high temperature and high pressure curing and molding, which is suitable for standard specification gratings.
Pultrusion molding: Produce grating profiles through pultrusion process, and then assemble them into grating plates, which are suitable for high-strength demand scenarios.
Hand lay-up molding: Suitable for customized special-shaped gratings, which are cured and molded after manual laying.
Vacuum infusion: The resin evenly penetrates the fiber under vacuum environment to improve the density and strength of the product.
High Strength
The specific strength of FRP is higher than that of steel, and the hoop tensile strength can reach more than 300MPa.
Corrosion Resistance
It can resist corrosion from chemical media such as acids, alkalis, salts, and organic solvents, and its service life is more than 30 years.
Light Weight
The density is only 1/4 of that of steel pipes, which is convenient for transportation and installation.
Low Friction Coefficient
The inner wall is smooth (roughness coefficient 0.0084), the hydraulic performance is excellent, and the conveying efficiency is high.
Good thermal insulation
Low thermal conductivity (0.25W/m·K), reducing heat energy loss.
Anti-aging&Electrical insulation
Anti-ultraviolet agent is added, suitable for outdoor and harsh environments. Non-conductive, suitable for power, communication and other fields.
OUR PROJECT
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How to choose the right FRP grating?
Choose thickness according to load-bearing requirements: light load (25mm), medium load (38mm), heavy load (50mm).
Consider the corrosive environment: choose a resin type that is resistant to acid, alkali and salt spray.
Anti-slip requirements: choose a sand surface or patterned surface treatment.
Color and aesthetics: choose the right color according to the use environment.
FRP grating has become an ideal substitute for traditional metal gratings due to its excellent corrosion resistance, high strength, light weight and long life. As a professional FRP grating manufacturer, we provide a variety of specifications and customized services, suitable for chemical, electric power, shipbuilding, construction and other fields. If you need to know more about the price, model and installation method of FRP grating, please consult!