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A tank outline with an internal line for a moving roof.
Also known as: External floating roof tank, Floating roof symbol
On a process diagram a floating roof tank is drawn with an internal line representing a roof that rests on the liquid and rises and falls with it, reducing vapour loss.
Denotes a tank whose roof floats on the stored liquid rather than being fixed to the shell.
Contexts: Technical drawing
Is specified to reduce evaporation loss and vapour emission from volatile liquids, since there is no vapour space above the liquid.
Contexts: Technical drawing
A tank rectangle with an additional horizontal line drawn across its interior, below the top edge.