FRP sand-filled pipe is a composite pipe based on FRP spiral pipe, with quartz sand added as a reinforcement material within the structural layer. Its typical structure is: inner lining (resin-rich layer, corrosion and seepage prevention) → structural layer (glass fiber provides strength) → sand-filled layer (resin + quartz sand, providing stiffness and reducing costs) → outer protective layer (anti-aging and external corrosion protection).
The design of FRP sand-filled pipe cleverly combines the advantages of multiple materials, resulting in the following outstanding features:
Extremely high stiffness and resistance to external pressure
Core Purpose: The primary function of the sand-filled layer is to significantly increase the pipe's hoop stiffness. The quartz sand and resin mix form a hard "composite mortar" layer, enabling the pipe to effectively withstand the immense external pressure of soil loads, live ground loads (such as vehicles), and groundwater, preventing deformation and flattening.
Strong designability: By adjusting the thickness of the sand layer, pipes with different stiffness grades (e.g., SN5000, SN10000) can be flexibly produced to meet the requirements of varying burial depths and geological conditions.
Excellent Corrosion Resistance
Inherits all the corrosion-resistant advantages of fiberglass reinforced plastic pipes. The inner lining, composed of a high resin content and a felt surface, provides an excellent corrosion and seepage barrier.
Application Value: Can be buried directly in corrosive soils without additional anti-corrosion treatment. When used to transport corrosive media such as sewage, rainwater, and reclaimed water, its service life far exceeds that of concrete and cast iron pipes.
Smooth Inner Surface
Absolute roughness is only 0.0084, Manning coefficient n=0.009, and hydraulic friction resistance is extremely low.
Lightweight and Easy to Install
Density is approximately 1.6-2.0 g/cm³, only 1/10 that of concrete pipe and 1/4 that of steel pipe.
Excellent Strength and Toughness
The fiberglass structural layer provides high axial and hoop tensile strength, enabling the pipe to withstand internal water pressure and certain settlement deformation.
Unlike rigid concrete pipe, it possesses a certain degree of toughness, adapting to minor foundation settlements or earthquakes, and exhibiting strong resistance to foundation deformation.
Ultra-Long Service Life and Low Maintenance
Corrosion-resistant, wear-resistant, and age-resistant, it boasts a design service life typically exceeding 50 years.
It requires virtually no maintenance throughout its lifecycle, eliminating the frequent inspection and replacement required by traditional pipes due to corrosion and scaling, resulting in extremely high overall economic benefits.
Grit-filled fiberglass pipe is a high-performance composite material designed for large diameters, heavy loads, and corrosive environments. Its unique "sand-filled" structure successfully combines the corrosion resistance of fiberglass with the high rigidity of concrete pipe, while also offering lightweight, hydraulically superior performance, and a long service life. It is a modern and ideal alternative to traditional pipes for underground pipeline construction in municipal and water conservancy projects, ensuring long-term, safe operation.
As a professional FRP Sand Pipe Manufacturer, Weitong FRP specializes in high-performance FRP Sand Pipe solutions designed for underground water supply, sewage, and industrial pipeline systems.
Our Glass Fiber Reinforced Plastic Sand-Filled Pipe combines advanced filament winding technology with quartz sand reinforcement to achieve exceptional stiffness, durability, and long service life.
Whether you are sourcing GFRP Sand Pipe for municipal infrastructure or industrial applications, we provide customized solutions tailored to your project requirements.
● Diameter Range: DN50 – DN4000
● Stiffness Class: SN2500 / SN5000 / SN10000
● Pressure Rating: 0.2 – 2.5 MPa
● Standard Length: 6m / 12m
● Standards: ASTM, AWWA, EN
● Joint Type: Double O-ring / Flange
Our FRP Sand-Filled Pipe systems are engineered to meet international standards and demanding underground conditions.
The performance of a Glass Fiber Reinforced Plastic Sand-Filled Pipe depends on its multi-layer structure:
● Inner Liner
Provides corrosion resistance and ensures smooth fluid flow
● Structural Layer
Delivers high tensile strength and pressure resistance
● Quartz Sand Layer
Increases stiffness and improves load-bearing capacity for underground installation
● Outer Protective Layer
Protects against environmental and mechanical damage
This optimized structure makes GFRP Sand Pipe ideal for deep burial and heavy-load conditions.
Our FRP Sand Pipe systems are widely used in:
✔ Municipal Sewage Systems
Designed for long-term corrosion resistance in wastewater environments
✔ Underground Drainage Pipelines
High stiffness ensures stability under soil and traffic loads
✔ Industrial Fluid Transport
Suitable for chemicals, acids, and aggressive media
✔ Seawater & Desalination Projects
Resistant to saltwater corrosion and harsh marine conditions
Each FRP Sand-Filled Pipe solution from Weitong FRP is engineered based on specific project requirements.
Selecting the right FRP Sand Pipe depends on several engineering factors:
● Burial Depth → Choose Stiffness (SN Rating)
Deeper installation requires higher SN values
● Operating Pressure → Select Pressure Class (PN)
Ensure the pipe meets system pressure requirements
● Fluid Type → Choose Resin System
Different resins provide resistance to specific chemicals
As an experienced FRP Sand Pipe Manufacturer, Weitong FRP provides full technical support for pipe selection and system design.
At Weitong FRP, we offer:
● Custom diameter and length production
● Project-based engineering design
● International standard compliance
● Fast delivery and global shipping
We are not just a supplier, but a long-term partner in your FRP Pipe projects.
Q : What does SN rating mean?
SN rating indicates ring stiffness, which determines the pipe’s ability to withstand external loads.
Q : How long does a GFRP Sand-Filled Pipe last?
Typically over 50 years under normal operating conditions.
Q : Can FRP Sand Pipe be used underground?
Yes, it is specifically designed for underground installation with high load-bearing capacity.
Weitong FRP supplies high-quality FRP Sand Pipe, GFRP Sand Pipe, and complete FRP Pipe solutions worldwide.
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