Nitrogen Blanketing versus Floating Roof
Nitrogen Blanketing versus Floating Roof
(OP)
From a product contamination standpoint, is nitrogen blanketing a fixed roof tank preferable to using a floating roof tank? I am working on a jet fuel tank farm and am looking into any cost savings that would be associated with decreasing the load on the nitrogen generator at the expense of the increased first cost of a floating roof tank. I'm aware that floating roof tanks are typically used for flammable substances but is there a significant increased possibility of product contamination due to contact with the atmosphere at the seals?
Thanks!
Thanks!





RE: Nitrogen Blanketing versus Floating Roof
RE: Nitrogen Blanketing versus Floating Roof
Floating roof tanks are predominantly used where vapour emmissions become excessive, but below bubble point. The usual issue with Floating roofs externally is that the seals and rofes can leak rain water into the product, which is a particualr issue with jet fuels, which is maybe what you are thinking of.
Not sure if an internal FR will reduce your Nitrogen load as I guess most of it is simply the result of discharing vapour during filling whilst having to fill the tank during discharge??
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Also: There's usually a good reason why everyone does it that way
RE: Nitrogen Blanketing versus Floating Roof
RE: Nitrogen Blanketing versus Floating Roof
RE: Nitrogen Blanketing versus Floating Roof
The evaporation rate from the liquid surface won't be slowed down by the N2 blanket but you will have inerted the vapor space and you will have no emissions from tank because you are sending the vapor stream from breathing and filling to a balance tank, flare or reclamation device. With a floating roof you can have varying amounts of emissions depending on the type of floating cover ( non-contact, full-contact, cheap, expensive, etc ) and the options chosen. Some are very, very good and your potential to emit can be surprisingly low.
Probably just what you were finding anyway...