What causes cracks in FRP storage tanks

1. Open air environment

If the glass fiber reinforced plastic acid-alkali tank has not adopted any anti-aging measures such as sun protection and heat preservation, the tank body is directly exposed to the open environment. The ultraviolet rays in the sun degrade the resin and reduce its strength. Moreover, rain and frost also have a certain corrosion effect on the appearance of FRP. Under the effect of water, the resin presents a degradation appearance, so that the glass fiber in the glass steel will be corroded and dissolved under the micro-crack and interface effect, so that the aging process will be accelerated and the strength will be reduced.

Two, temperature difference change

The storage tank is directly in the direct sunlight state, the thermal expansion and cold contraction can make the FRP acid-alkali tank appear tired, the glass temperature difference change, the residual open space and bubbles inside the steel, the simple expansion under the condition of temperature difference change, accelerate the damage of the structure, and reduce the strength.

Three, stress elements

The tank gas is filled with 30% hydrochloric acid, and the upper part of the tank is a gas phase environment. In the gas phase state, the volume of the body molecules is small, the activity is intense, and it has entered the glass fiber reinforced plastic tank to gather, and the stress concentration occurs. In addition, during the use of FRP acid and alkali tanks, because the liquid level of the storage medium constantly changes, the storage tank is often in a state of elastic change, and the tank constantly bears the effect of alternating stress. At the fulcrum, the fulcrum exerts upward force on the tank, and then causes shear stress at the joint part of the head and the tank body. The gravity of the head itself, the media extrusion, and the fierce external bump will cause the crack to expand rapidly.