Receptacles – Stationary tank
Patent
1993-11-26
2000-12-05
Pollard, Steven
Receptacles
Stationary tank
22049501, 22049505, B65D 8800
Patent
active
061554499
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a breather bag made with an impermeable and flexible membrane and with an approppriate shape, for using in open type or closed type tanks for storage and/or transportation of liquid products under atmospheric pressure.
Specifically, the present invention refers to a bag that is produced by use a membrane that, working as a breather in a storage tank, guarantees that the air vent of the storage tank will work normally, without discharacterization of its qualification in storage and/or transportation of liquid products under atmospheric pressure. Additionally, it makes possible the operation of air venting in storage tanks with physical segregation between the stored liquid product and the atmospheric air and environment.
As it is well known, a storage tank is called of atmospheric type when its inner side communicates with the environment (atmosphere) by a free way (air vent hole) and the internal pressure on the tank's wall is equal to its stored liquid column height.
The atmospheric storage tank is called closed type when it communicates with the environment through a top openning (connection or nozzle) named air vent hole. The atmospheric storage tank is called open type when it communicates with environment entirely through the full exposed surface of its stored liquid product.
The air vent of closed type atmospheric storage tanks has the following functions: storage tanks, by allowing the free entry of atmospheric air. This free way entry may be due to a decrease in ambient temperature, that would consequently cause the contraction of air+gases mixture volume contained in the vapor space of the tanks and due to withdrawal operation of liquid product stored in the tanks. storage tanks, with free way blow out of air+gases mixture contained in the vapor space of the tanks through the vent hole, due to increase in ambient temperature (consequently it would occur the expansion of air+gases mixture volume contained in vapor space of the tanks) and due to filling operation of liquid product to store in the tanks.
In this way, the mechanical strenght design calculation of atmospheric storage tanks takes into account only the stress due to height of stored liquid product in the tanks.
The atmospheric storage tanks are commercialy available in a wide range of alternative making forms, as:
The atmospheric storage tanks are normally used for storing liquid products of several natures, as:
The liquid products to be stored in atmospheric tanks may present some characteristics, with specific applicable requirements concerning to products quality protection and safeguard procedure to be observed in each case, such as:
The liquid product is naturally exposed to evaporation change when gases take away from the liquid-gases separation surface. These gases are expelled out through the air vent to the environment. This normally occurs for a dead state, specially during the product filling operation of atmospheric tank, by causing serious inconveniences like:
The atmospheric air that enters into the storage tanks through the vent hole, which contains water vapours in its composition, may cause several other problems, such as:
The communication between existent storage tanks and the environment by a free way through vent hole, allows the entry into tank of insets, small animals or birds. These small creatures, when confined inside the tanks, may contaminate stored liquid product either by their excrement either by its putrefaction. In this case, if there is sanitary requirement to the liquid product, it may be prejudged forbidden to use for consumption in food or pharmaceutical industry.
The document PCT number WO 84/04515, (Nov. 22, 1984), METHOD AND DEVICE FOR PERMANENTLY STORING LIQUIDS PARTICULARLY VOLATILE LIQUIDS INTO CONTAINERS CLOSED UNDER ATMOSPHERIC PRESSURE, explains a process and a device that is applicable only to volatile liquids storage tanks, characterized by stored product with constant mass, under atmospheric pressure, just in closed type storage systems . The purpose of thes
REFERENCES:
patent: 1709701 (1929-04-01), Althoff
patent: 3215307 (1965-11-01), Connell
patent: 3477610 (1969-11-01), Hansen
patent: 3623629 (1971-11-01), Hendershot
patent: 4280634 (1981-07-01), Wiesenberger et al.
patent: 4457441 (1984-07-01), McCloughan
patent: 4635814 (1987-01-01), Jones
patent: 4852765 (1989-08-01), Lyzohub
patent: 5110005 (1992-05-01), Schilling
patent: 5673664 (1997-10-01), Lassanske
WO, A, 8 404 515 Nov. 11, 1984.
WO, A, 8 501 035 Mar. 14, 1985.
Frontenge Engenharia LTDA
Pollard Steven
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