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external floating roof

thread483-122372

external floating roof

external floating roof

(OP)
hi,
I have an external floating roof 60m dia tank experiencing problems with deformations possibly because of vapour bubbles underneath. Water accumulation on top exacerbates the deformation but as soon as the vents are open, the water comes back towards the central area which to me suggests that the internal vapour pressures are responsible for this deformation. This is a 5mm pontoon roof, oil tank to API 650 (designed to 0.7 specific gravity).
Q: what other factors can be responsible for slightly tilting the roof (pontoon corrosion?, flooded pontoon?)
some brainstorming would help
thanks
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