Common Questions About Glass Fiber Pipe
1. Low stiffness and strength. The elastic modulus of glass fiber reinforced plastic (GFRP) is twice that of wood, but ten times less than steel (E=2.1×10^6), thus often experiencing insufficient stiffness in product structures and prone to deformation. When GFRP is used in water, especially saltwater, for extended periods, its strength will significantly degrade due to the permeation of saltwater and the swelling action of GFRP, leading to potential destruction.
2. Glass steel pipes can also undergo "corrosion," but unlike the corrosion of ordinary carbon steel, the "corrosion" of glass steel pipes manifests through material degradation. The performance decline of glass steel pipes after absorbing water, swelling, and aging is considered within the scope of corrosion. For glass steel pipes, while the wall thickness may even slightly increase due to water absorption and swelling, the material and performance have severely deteriorated, even reaching a point of being unusable.
3. Glass fiber-reinforced plastic (GFRP) has a high coefficient of thermal expansion. The coefficient of thermal expansion of GFRP is significantly higher than that of carbon steel (about two orders of magnitude), so when using long-distance GFRP pipes in regions with large temperature differences, it is necessary to consider the destructive effects of thermal expansion and contraction caused by temperature variations on the GFRP pipes.
4. Poor long-term temperature resistance. General fiberglass cannot be used under high temperatures for extended periods. The strength of general polyester fiberglass significantly drops above 50℃, and for general epoxy fiberglass, it drops notably above 60℃.
5. Aging Phenomenon. Aging is a common defect in plastics, and glass fiber reinforced plastics are no exception. Under the influence of factors such as ultraviolet light, wind, sand, rain, snow, chemical media, and mechanical stress, it tends to lead to a decline in performance.
6. Low interlayer shear strength. This is because the interlayer shear strength is supported by the resin, hence it is quite low.
7. Construction Quality: Another critical issue with the use of glass steel pipes is the handling of on-site interfaces. Currently, in China's glass steel construction projects, interface quality issues are prominent, particularly for long-distance pipelines where a high number of interfaces are present. The quality of interface handling directly impacts the overall quality of the entire project.
The third is the selection of membrane systems and metal inverted skeleton structures. This is suitable for centralized, large-scale sewage ponds. The supporting structure uses an external steel frame to maintain the shape of the membrane structure. The membrane structure can prevent corrosion from corrosive gases, and the supporting structure being external eliminates concerns about rust.
Due to its excellent properties such as corrosion and flame resistance, anti-slip durability, lightweight, ease of installation, maintenance-free, and insulation, glass fiber reinforced plastic is suitable for deodorizing wastewater in treatment plants across industries like oil, chemicals, urban sewage treatment, food, metallurgy, compound fertilizers, and light textiles printing and dyeing.
