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API 650 storage tank roof type selection based on tank diameters

API 650 storage tank roof type selection based on tank diameters

API 650 storage tank roof type selection based on tank diameters

Hi everyone,

Please tell a thumb rule for the selection of a roof type (self supported, rafter supported, rafter+column and dome) based on the diameter of a storage tank being designed in accordance with API 650

As i have read, the storage tank guide book by Bob Long gives the following criteria for the the roof selection of the tanks based on diameters

For tanks upto 8 metres in diameter: Self supporting cone roof

For tanks upto 15 m in diameter: Rafter supported roof

For tanks greater than 15 m: Go for rafters+columns or truss structure

But i have also seen that if, for example you increase the angle for a self supporting cone roof, say between 15 to 19 degrees, you can have the roof to pass as a self supporting structure, even for a 12 metres diameter tank

Please if you guys can share anything, you are welcome to do so.

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