Problems with fiberglass-reinforced plastic linings in large storage tanks
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I recently received a project involving a vertical, atmospheric-pressure storage tank with a capacity of 300 cubic meters. The medium stored in this tank is an aluminum sulfate solution; the tank’s diameter is 6.5 meters and its height is 10 meters. The tank body is made of carbon steel, and it requires a fiberglass lining. The questions are as follows: 1. Can the wall thickness of the tank be calculated using the standard method specified in JB/T4735－1997? 2. Can a self-supporting conical roof be used for the tank top (as it is considered easier to work with than an arch-shaped roof)? GB50341 does not impose any restrictions on the cone tip diameter in terms of tank diameter. 3. How should the technical requirements for this lining equipment be written? It seems there are no relevant standards for fiberglass lining, right? 4. What are the standards for JC 718-1990 Glass fiber reinforced plastic pressure vessels for use on the ground (ZBQ23004) and JC 718-1990 Glass fiber reinforced plastic polyester resin corrosion-resistant horizontal vessels (ZBQ23005)?
We manufacture fully FRP equipment; the anti-corrosion coating thickness is 7.5–9.5 MM. As long as the right resin is chosen and the resin content is properly controlled, it will work fine. Vinyl resin is commonly used as the matrix, with types such as S901 and 411 being popular. Four layers made of chopped glass fiber mat are used, with a resin content of 75%; additionally, two layers of surface mat with a weight of 180 g/m² are applied, having a resin content of 90%. A410 can be used as the bonding material. To be honest, this is quite difficult to implement – it’s not easy to do. It might be impossible to fabricate such components when the nominal diameter is less than 80 mm. It’s best to use a fully FRP structure, or structures made of PVC/FRP, CPVC/FRP, or PP/FRP. Check the relevant manuals to determine which type of structure is easier to manufacture
That’s not the right answer; it seems like advertising!