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Internal Floating Roof Tank VS External Floating Roof Tank, Which Is Better?



floating roof tank


What is a floating roof tank?

The floating roof of a floating roof tank is a floating roof floating on the surface of stored liquid,  floating up or down with the level of stored liquid. There is a annular space with seal gland between the floating roof and the tank wall, to separate air when stored liquid float up or down on the roof, greatly reducing evaporation loss in the storage process. Compared with fixed roof tank, using a floating roof tank to store oil product can reduce evaporation loss to 80% approximately. 
Totally, floating roof tank can be divided into internal floating roof tank and external floating roof tank
Floating roof tank structure
Floating roof tank structure

Difference between internal floating roof tank and external floating roof tank


difference between internal floating roof tank and external floating roof tank
         Internal floating roof tank                    external floaitng rof tank                             fixed roof tank

The transmitter and the receiver of the two ways of storing liquid are same, specific differences between external floating roof tank and fixed internal floating roof tank as follows:

Internal floating roof tank

external floating roof tank

Characteristic of internal floating roof tank

Internal floating roof tank is known as internal floating roof storage tank, floating roof oil tank, internal floating plate storage tank and internal floating plate oil tank, etc. specifically, it is an environment-friendly and economical storage tank or oil tank installed a floating roof under the vault of the tank, usually made of aluminum, stainless steel, or other material to prevent the liquid from volatilize. It is a volatile liquid storage tank, also a floating roof tank combined with the internal floating roof structure, which has been widely used in gasoline, aviation kerosene, and volatile chemical liquid.

Characteristic of internal floating roof structure

internal floating roof tank structure

           Internal floating roof              Internal floating roof tank structure             Internal floating roof tank seal

An internal floating roof or internal floating plate is a head cover floating with oil and liquid up or down on the oil surface. Adopting the internal floating roof cover in the liquid surface is recognized as the most ideal economic and practical method to reduce the evaporation loss of oil products.

Internal floating roof tank advantages

Internal floating roof tank parameter as follows:

External floating roof tank

Concept of external floating roof tank

External floating roof tank is known as external floating roof oil tank, it is an open top floating roof tank without vault, there is usually an external floating roof in it, which can vertical float up and down. It is usually used in steel open top tank large more than 20,000m³ for volatile oil products such as crude oil, gasoline, kerosene, etc, and external floating roof rises or falls with the liquid. There is a floating plate covers on the external floating roof tank, which rises or falls with the liquid. As there is almost no gas space between floating plate and oil surface, greatly reduced evaporation loss of the stored oil product.

Characteristic of external floating roof tank

A floating roof is the most core component of floating roof tank. Floating roof tank can be divided into two types, internal floating roof and external floating roof. 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. As a floating roof is a roof floating upon the oil liquid surface, tightness is most important, the floating plate is mainly used for elastic filler, at the same time be compacted surrounding the tank with the tank wall by a layer, and be fixed with floating roof by bolts. Floating plate rises or falls with the liquid surface, when it reduces to about 1.8cm, there will be pillars to support the floating plate for holding it in position.
Compared with internal floating roof tank, external floating roof tank has the following advantages:
External Floating Roof Tank Seal
                 External floating roof tank seal                                                 External floating roof

Safety requirements of floating roof tank


 
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