The Internal Structure of the FRP Storage Tank and Repair Method

 

 

Not many people know the internal structure of FRP storage tanks. FRP tank wall is divided into an internal layer, secondary internal layer, and external surface. Next, we introduce these internal structures.

 

FRP storage tank internal structure

1. FRP tank lining layer

FRP storage tank lining layer consists of the inner surface layer and secondary inner layer, the matrix should be used bisphenol A type unsaturated polyester resin, vinyl ester resin, and other resins with excellent corrosion resistance. Reinforcing materials are glass fiber surface felt, glass fiber short-cut raw silk felt and glass fiber untwisted roving cloth, etc.

2. FRP storage tank secondary inner layer

It is made of general-purpose unsaturated polyester resin as the matrix and glass fiber twist-free roving as the reinforcing material. Resin content is 45%-50%, the thickness of the layer is determined by the design calculation.

3. FRP storage tank outer surface layer

The unsaturated polyester resin with excellent weather resistance is used as the matrix, and the glass fiber surface mat or glass fiber untwisted roving cloth (thickness less than 0.16mm) is used as the reinforcing material, with resin content more than 55%, and the thickness of the layer is 0.2-0.5mm.

 

Repair of FRP storage tank

Although the FRP performance is superior, in terms of hardness, corrosion prevention is good, but also for one reason or another, resulting in FRP storage tank leakage, and FRP damage, in most cases to replace the main, repair is very difficult, usually with the gluing method or hot welding method to restore it, here is a brief introduction to the gluing method of repair.

(1) cleaning FRP storage tank. First of all, the damaged tank will be disassembled first, clean and dry it, and do the prerequisite work of repair.

(2) according to the size of the broken part cut appropriate large glass fiber cloth, after baking wax removal, heating until not smoking, take care not to fold.

(3) Glue preparation. There are many kinds of glue formulations, but in general, the epoxy resin and polyamide resin two kinds of resin in the ratio of 1:1 into a wide mouth container, stirring with a stick, the viscosity is generally good to lift the stick does not pull the wire, pay attention to the principle of rather less than more, not too much at a time, to just enough to use up as good, followed by uneven mixing, with a good glue after a period of time will be Self-curing, resulting in waste.

(4) Apply glue. First, use a stiff brush to brush a layer of glue in the inner surface of the glass fiber reinforced plastic tank, and then the prepared glass cloth on the surface of the glue, gently pat the pressure to make it fit tightly so that the glue penetrate the glass cloth; the first layer of good penetration and then coated with a second layer of glue, paste the second layer of glass cloth. So the cycle coated a few layers on it, take care not to get too thick in the coating and framing.

(5) Curing. After painting a higher temperature place to let its natural curing, although it takes a longer time, but definitely not with open fire baking. Wait for its natural curing, and then polish the edges, openings, after spraying, the repair is complete, the glass fiber reinforced plastic tank and restore the strong and durable.

 

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