1, outdoor environment. Ultraviolet radiation will degrade the resin and reduce its strength. At the same time, due to the erosion of the surface of FRP tank by wind, rain and frost, the resin is degraded, and the glass fiber in FRP tank will be eroded and dissolved under the action of microcracks and interfaces, which will accelerate the aging process and reduce the strength.
2. Temperature difference. Glass fiber reinforced plastic tank in direct sunlight. Thermal expansion and cold contraction will cause fatigue of FRP storage tanks. The remaining gaps and bubbles in the FRP tank are easy to expand under the condition of temperature difference change, which accelerates the structural failure and reduces the strength.
3. Stress reason: In the gas phase, the block molecules are small in volume and high in activity, which have infiltrated into the FRP tank and gathered at the defects, resulting in stress concentration and destruction.
In addition to the above three reasons, in the process of using FRP storage tanks, FRP storage tanks are often in an elastic state due to the constant change of storage medium level, and the storage tanks are constantly subjected to alternating stress. The fulcrum at the fulcrum produces upward force on the tank, which causes shear stress at the joint between the head and the FRP tank. The gravity of the head itself, the extrusion of the medium and the strong external collision will make the crack spread rapidly and widely. Lead to leakage of FRP tank.
Usually, the service life of FRP tanks is 6-8 years, but due to the different manufacturing processes and resin materials, the service life of integrally wound FRP tanks can reach 15 years or more.