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Properties and advantages of FRP sand pipe
Writer:admin    Released:2018-07-31 16:20:29    Type:【L】【M】【S
As a result of the design of FRP sand trap in the pipe wall, compared with pure glass steel pipe, it not only has light quality, high strength performance, but also has the high rigidity and low cost required by geographical pipe, so it has been widely welcomed since its inception.More and more applications are being made in transporting water or other liquids.
According to relevant data reports, in the mid-1990s, the United States had installed 160,000 km of FRP sand pipe, and the length of installation of FRP sand pipe accounted for 35% to 50% of the new large and medium-sized water and sewage pipes in European countries.In Japan, the tube also accounts for a significant share of the market, with installation lengths exceeding steel and concrete pipes.In the Middle East, almost all the large and medium water, sewage and desalination pipelines are made of FRP sand traps.
The characteristics and principles of FRP sand trap mainly include the following aspects:
1. Lightweight, high strength and high rigidity FRP sand trap is composed of inner liner, winding layer, resin sand trap layer and outer antiseptic layer. Its proportion is 1.7-2.1, 1/5 of steel pipe, 1/4 of cast iron pipe and 3/4 of prestressed concrete pipe.Because of the fiber winding structure on both sides of the resin mortar layer, the fiber content of this layer is 70%, which can fully meet the strength requirements of the pipeline.In addition, because the resin mortar layer is located in the ground stress zone in the middle of the winding strengthening layer, the rigidity of the pipe is greatly improved without reducing the strength.
2. Corrosion resistance of FRP sand-clamping pipe mainly depends on the corrosion resistance of the inner liner resin, and the inner liner can choose the unbranded resin according to the needs of the medium conditions.The lining layer of FRP sand pipe is a rich resin layer strengthened by fiber, with the resin content up to 80%, which can ensure the anti-corrosion and anti-leakage of the pipe.
3. The inner surface of glass fiber reinforced plastic sand pipe with good water conservancy performance is very smooth, and the roughness coefficient is small.The water conservancy coefficient C can be stored in the range of 145-150 for a long time. The tested coefficient of water flow friction loss f is 0.000915, which can significantly reduce the pressure loss along the path compared with concrete pipe (f=0.00232) and steel pipe (f=0.00179) and improve the conveying capacity by more than 20%.Therefore, at the same time of conveying capacity, fiberglass reinforced plastic sand clamping pipe with small inner diameter can be selected to reduce the one-time investment of the project.
4. Health performance of FRP sand inclusion of glass steel sand tube tube to the raw material is used in the unsaturated polyester resin and glass fiber which is produced by certain, pipe inner surface is very smooth, and barcol hardness above 40, unsaturated polyester resin itself has passed the certification of national health and epidemic prevention departments, FRP pipe products also passed the national health and epidemic prevention departments of inspection, so the glass fiber reinforced plastic sand inclusion can completely satisfy the standard of drinking water, and pipe and instance in the country for more than twenty years.
5. Aseismic performance as the FRP sand pipe is between the rigid pipe and the flexible pipe, it has good seismic performance, and will not be deformed or damaged under strong external forces. This is because the FRP pipe is not stratified or cracked when the deformation is 25%.
6. The surface of the abrasion-resistant reinforced fiberglass sand pipe is made of resin with high wear resistance, which can greatly improve the wear resistance of the product and thus improve the service life of the product.
7. Low temperature resistant properties: FRP sand pipe can not freeze and crack at minus 40 degrees, and the strength of the pipe will not be decreased.
8. Environment-friendly FRP sand trap pipe can be applied to various environments, such as beaches, seabed, rivers, mountains, marshes, deserts and plains, etc., featuring fast installation, convenient transportation and long service life.

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