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Annular Plate & Bottom Plate sizes for Storage taks

Annular Plate & Bottom Plate sizes for Storage taks

(OP)
Hi Members! Would like to know whether Annular Plate and the rest of Bottom plates can be of same thicknesses for a API650 Storage tank? Are there any thickness limitations that Bottom plates have to be thinner than the Annular plates.

RE: Annular Plate & Bottom Plate sizes for Storage taks

They can be the same thickness if the design permits.

RE: Annular Plate & Bottom Plate sizes for Storage taks

Yes, I have seen in many projects annular and bottom plate are in the same thickness.

Also I have seen they are not. It is depend on the calculation done by the tank designer.

RE: Annular Plate & Bottom Plate sizes for Storage taks

Hi kvbalu2011.

According to API 650, paragraph 5.4.1 "All bottom plates shall have corroded thickness of not less than 6 mm (0.236 in)..." That is the only limitation.

About annular bottom plates, paragraph 5.5.3 refers to minimum thickness according to plate thickness and stress in first shell course.

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