Fixed Roof Tank Vs Floating Roof Tank

The primary consideration in selecting the type of roof is to prevent the vapour loss where by emission to atmosphere is eliminated.

Fixed roof tank vs floating roof tank. Perfect designed internal floating roof storage tank is the best method to control the evaporation loss of the fixed 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. From a product contamination standpoint is nitrogen blanketing a fixed roof tank preferable to using a floating roof tank. Of currently used tank designs the fixed roof tank is the least expensive to construct and is generally considered the minimum acceptable equipment for storing liquids.

Internal floating roof tank can be used to store gasoline jet fuel and other volatile oil and liquid chemicals like aldehydes alcohols methanol ethanol ketones acetone benzene benzene toluene xylene styrene. As per the oil indystry practice in india floating roof tank is used for storing hsd. An internal floating roof tank is a floating roof tank fixed an extra fixed roof on the floating roof to prevent floating roof from wind and rain and guarantee the quality of the stored oil. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. A typical fixed roof tank consists of a cylindrical steel shell with a cone or dome shaped roof that is permanently affixed to the tank shell. When the tank was refilled with warm crude oil at 37 c 100 f vapor was pushed out into the space above the floating roof and then out into the atmosphere through vents on the fixed roof tank figure 5 16. Closed floating roof tank this has an internal floating roof but eliminates natural ventilation of the tank vapor space.

Instead the cfrt is equipped with a pressure vacuum pv vent and may even include a gas blanketing system such as that used with fixed roof tanks these tanks are designed as in appendix c of the api standard 650. If product purity is a concern you have to use floating cum cone roof. Floating roof also reduces the static electricity hazard.