Reasons for Corrosion in Fiberglass Pipe
During the application process, corrosion of the glass fiber reinforced plastic pipes may occur. The causes are generally attributed to two main conditions:
1. During the welding and patching of fiberglass pipe joints, due to the high difficulty and strict requirements of the patching skill, it is often challenging to meet the standards during construction, leading to perforations in the welding area.
2. Due to rapid heating and cooling during welding, the arrangement of the base material changes, leading to galvanic corrosion; the influence of other welding residual stresses causes stress corrosion. Glass fiber reinforced plastic conduit, also known as glass fiber reinforced plastic piping, is made by bonding glass fibers with unsaturated resins. It can be categorized into low, medium, and high alkali pipes, with quality determined by the alkali content. The glass fiber reinforced plastic conduit is strong in pressure resistance, lightweight, with a smooth inner wall, and has a low friction coefficient, making it easy to install cables without damaging them. The glass fiber reinforced plastic conduit serves as a cable maintenance device that provides protection for power and communication cables underground, especially when subjected to external pressure or impacts. The smooth inner and outer surfaces of the glass fiber piping significantly reduce pressure loss along the pipeline, allowing for the use of smaller pipe diameters or less powerful pumps under the same flow rate conditions, thereby reducing initial engineering costs and energy consumption (operational costs). The addition of resin mortar in the middle layer of the pipe wall increases its stiffness, making it suitable for installation in various soil environments and underwater.
Here are several maintenance methods for fiberglass pipe:
1. Inspect the fiberglass' fixation status
3. Review operational status and consult historical maintenance records
3. View the calibration of the mechanical operation section
4. Inspect electrical circuit conditions
5. To inspect the exterior condition
6. Review and Adjust Overall Operational Status
7. Effective Cleaning (1) Strong corrosion resistance. The FRP sand pipe is resistant to acid, alkali, saltwater, untreated wastewater, corrosive soil, and various chemical fluids. Under normal conditions, the lifespan of plastic pipes is 3 years, cast iron pipes are 5-10 years, and steel pipes only last for 15 years, while FRP sand pipes can reach up to 50 years.
(2) With heat resistance, antifreeze, and algae resistance. The working temperature of the glass fiber reinforced plastic (GFRP) sand pipe typically ranges from 40℃ to 80℃. When using special resins, the operational temperature can be higher, and it won't deform in the summer heat. Both the inner and outer surfaces of the FRP sand pipe are lubricated, preventing attachment of various microorganisms from the culture medium and avoiding algae growth. Metal or concrete pipes may develop algae over time, which directly impacts their service life.
(3) Lightweight with high strength, easy to transport. The specific gravity of the glass-fiber reinforced plastic (GFRP) sand pipes ranges from 1.9 to 2.2 g/cm³, with hoop tensile strength up to 320 MPa and axial tensile strength up to 230 MPa. Compared to other materials of similar pressure and diameter, the composition of each unit length of glass sand pipes accounts for about 30% of steel pipes and about 8% of reinforced concrete pipes, making transportation of equipment very convenient. Each FRP sand pipe is 12 meters long, which can reduce the need for concrete pipes by two-thirds. It is equipped with a combination of bevel and sleeve double-sealed joints. The installation is quick and easy, with convenient joint pressure testing. Additionally, it eliminates the need for welding, rust prevention, and corrosion protection for the equipment's GFRP sand pipes.
(4) The plan offers broad adaptability. Under normal circumstances, the pipeline's design coefficient is greater than 4, enabling the product to be used long-term and cater to various specific user requirements such as pipeline diameter, flow rate and pressure, mechanical functions, corrosion resistance, frost resistance, and operational use. It is designed and produced for use in environments such as vacuum. It is highly versatile and has a wide range of applications.
(5) The project demonstrates comprehensive effectiveness. Comprehensive benefits refer to the project's overall cost and long-term returns, encompassing factors such as infrastructure, installation, maintenance, and the service life of fiberglass-reinforced plastic (FRP) sandwich pipes. Considering the various functions and long-term use of the pipelines, the sensory advantages of FRP pipes and FRP sandwich pipes are commendable. Particularly, as the size of the pipeline increases, the cost decreases, and the buried pipelines can be used continuously for generations without annual maintenance, highlighting the superiority of their sensory advantages.
The glass-fiber reinforced sand pipe not only boasts the aforementioned advantages but also features low friction resistance and excellent insulation properties.
