EP0796211A1 - Variable volume sealed container for storing liquids - Google Patents
Variable volume sealed container for storing liquidsInfo
- Publication number
- EP0796211A1 EP0796211A1 EP95941762A EP95941762A EP0796211A1 EP 0796211 A1 EP0796211 A1 EP 0796211A1 EP 95941762 A EP95941762 A EP 95941762A EP 95941762 A EP95941762 A EP 95941762A EP 0796211 A1 EP0796211 A1 EP 0796211A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- uquide
- liquid
- floating cover
- upper element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/38—Means for reducing the vapour space or for reducing the formation of vapour within containers
Definitions
- the present invention relates to a sealed variable volume tank for storing a liquid.
- Such a tank can be intended for the storage and possibly for the transport of all kinds of liquid products, in particular those whose contact with the atmosphere must be avoided, for example for reasons of hygiene, conservation, security and protection of the environment.
- This is the case in particular for drinks or other liquid food products such as drinking water, mineral water, milk, or hydrocarbons presenting risks of evaporation, pollution or explosion, or even liquids which must be kept away from air to avoid their oxidation, such as fruit juices or wine, or to avoid the emission of odors as is the case with slurry.
- variable volume tank such as a flexible tank makes it possible to avoid most of these problems, but may present other well-known difficulties, related to the materials, the stability and the durability of the flexible walls. .
- Document FR-A-2 385 612 describes a tank for the storage of hydrocarbons at almost constant volume.
- This tank has around the upper part of the tank a sealing cavity containing water. It also includes a floating roof which rests directly on the hydrocarbon and extends beyond the wall of the tank to end in a peripheral part which plunges into the sealing cavity.
- This reservoir is at constant volume thanks to an increase in the volume of water on which the hydrocarbon rests to compensate for the decrease in the volume of hydrocarbon.
- the floating roof moves very little. Its sliding along the tank is also limited by the length of the heating devices used to thin the hydrocarbon.
- This reservoir has drawbacks, in particular the mixing the water with the hydrocarbon and the impossibility of completely emptying the tank since it is necessary to maintain a constant volume.
- the patent US-A-1 823 256 also describes a tank for hydrocarbons almost constant volume comprising in its upper part an annular cavity filled with water.
- the tank also has a floating cover supported on the hydrocarbon and extended by a vertical skirt which plunges into said cavity.
- This device works thanks to a balance established between the hydrocarbon and the EA which are in contact in the annular cavity.
- the seal is therefore not respected.
- the annular cavity being limited in height prevents the floating roof from sliding downwards and from remaining in contact with the fluid if the level drops. This arrangement therefore has the drawbacks of bringing the water into contact with the stored fluid and always requiring a constant volume.
- the present invention aims to avoid these drawbacks, by creating a variable volume tank which consists of essentially rigid elements, ensures excellent tightness with respect to the atmosphere and great security with respect to the risks of pollution of the product or environment and allows, if necessary, to keep the stored liquid away from contact with air.
- the invention relates to a reservoir of the type indicated in the preamble, characterized in that it comprises a lower element, forming a tank open upwards and arranged to contain a variable volume of the liquid to be stored, called the first liquid. , and an upper element mounted on the lower element so as to ensure a tight closure of the tank and to slide vertically when the volume of first liquid varies, in that the lower element comprises, around the tank, a jacket seal open upwards and containing a second liquid between two peripheral walls, in that the upper element comprises a floating cover, pressing on the first liquid directly or through a gas, and a vertical skirt integral with the cover and immersed in the second liquid in the sealing jacket, and in that an intermediate gas is retained captive in the upper element by free surfaces respec tives of the first and second liquid.
- the upper element of the tank can move up and down like the bell of a gasometer, but these movements are directly dictated by the variations in the level of the first liquid stored in the tank.
- the upper element the construction of which can be entirely rigid, guarantees an appropriate and lasting seal against the atmosphere, thanks to its skirt permanently immersed in the second liquid.
- an intermediate volume of gas acting as a buffer between the free surfaces of the first and of the second liquid inside the upper element, and which can have a substantially constant volume makes it possible on the one hand to avoid any contact between the two liquids and, on the other hand, to avoid contact of the first liquid with air or oxygen, if this intermediate gas is a neutral gas, for example nitrogen.
- the sealing jacket also extends below the tank so as to completely surround the tank, except upwards.
- said peripheral walls comprise an inner peripheral wall, separating the sealing jacket from the interior of the tank, and an outer peripheral wall having an upper edge situated lower than an upper edge of the inner peripheral wall.
- the floating cover may have a bottom and a peripheral wall extending upwards from this bottom and sealingly connected to an upper edge of the skirt.
- the bottom of the floating cover can rest directly on the first liquid.
- the bottom of the floating cover can be convex down or convex up.
- the intermediate gas may extend between the first liquid and the bottom of the floating cover and support the upper element.
- these may comprise at least one pipe passing under the tank and opening into the tank through a bottom thereof.
- these can comprise at least one pipe mounted on the upper element and opening into the tank through the floating cover.
- FIG. 1 is a schematic view in vertical section of a first embodiment of a tank according to the invention, when the tank is full,
- FIG. 2 represents the reservoir of FIG. 1 when it is practically empty
- FIG. 3 represents a variant of the embodiment according to FIG. 1, where the intermediate gas buffer also extends between the upper element and the stored liquid,
- FIG. 4 represents another variant of the embodiment according to FIG. 1,
- FIG. 5 is a view similar to FIG. 2 and represents a variant of double-jacketed tank offering increased security
- FIGS. 6 to 8 are schematic plan views showing different possible forms of a tank according to the invention.
- FIG. 9 is a schematic view in vertical section of two twin tanks.
- the reservoir shown mainly consists of a stationary lower element 1 and an upper element 2 mounted on the lower element so that it can slide vertically along the double arrow A
- the two elements 1 and 2 are of rigid construction, preferably metallic, they are preferably cylindrical, but other shapes are possible as will be described later.
- the lower element 1 has a slightly conical sealed bottom 10, an inner peripheral wall 11 connected to the bottom 10, an outer peripheral wall 12 and an annular bottom 13 sealingly connecting the walls 11 and 12.
- the bottom 10 and the wall 11 together form a cylindrical tank 14 containing a variable volume of a first liquid 15 which is the liquid to be stored in the tank.
- the walls 11 and 12 and the annular bottom 13 together define a narrow annular sealing jacket 16, which does not communicate with the interior of the tank and in which is placed a constant volume of a second liquid 17 serving as sealing liquid.
- the external peripheral wall 12 has an upper edge 18 situated a little lower than the upper edge 19 of the internal peripheral wall 11, in order to prevent any risk of accidental spillage of the sealing liquid 17 inside the tank 14.
- the upper element 2 has a cover 20 which closes most of the upper opening of the tank 14 and floats on the first liquid 15 contained in this tank.
- the cover 20 comprises a circular bottom 21 and a cylindrical peripheral wall 22.
- the bottom 21 is convex downwards, for example conical, to avoid retaining gas under it II can be provided with an inspection hatch 23 closing so waterproofs a manhole intended for access for maintenance work.
- the peripheral wall 22 is surrounded externally by a cylindrical skirt 24 to which it is tightly connected by an upper ring 25 which can support a roof 26 (shown diagrammatically) if the tank is used in the open air.
- the skirt 24 slides inside the jacket 16, where its lower edge 27 is permanently immersed in the sealing liquid 17, which prevents any passage of gas in one direction or the other between the interior and outside the tank.
- the wall 22, the ring 25 and the skirt 24 define an annular chamber 28 in which an intermediate volume of gas 29 is retained, this gas being in contact with the upper surface 30 of the first liquid 15 and the upper surface 31 of the second liquid 17 inside the chamber 28.
- the intermediate gas 29 can for example be air or a neutral gas such as nitrogen. It is preferably at a pressure close to atmospheric pressure, so that the free surface 32 of the second liquid 17 outside the skirt 24 is substantially at the same level as the surface 31 of this same liquid inside of the skirt.
- the chamber 28 can be connected to a decompression sniffer 34, making it possible to adjust the pressure of the intermediate gas 29 and being able to be connected to a supply or accumulation tank for this gas (not shown).
- Known level detection means can be installed in the sealing jacket 16 to monitor the levels of the surfaces 31 and 32.
- the liquid to be stored 15 is introduced into the tank 14 and withdrawn from this tank via a pipe 35 connected to the bottom point 36 of the bottom 10 of the tank and provided with a valve 37 or d other means of control.
- the upper element 2 moves to the same extent as the upper surface 30 of this liquid, while its skirt 24 slides in the outer jacket 16 where it can be guided by guide members such as slides or rollers (not shown).
- guide members such as slides or rollers (not shown).
- these guide members are protected from the stored liquid 15 and can be lubricated by the sealing liquid 17.
- the level and the volume of the stored liquid 15 are therefore visible directly from the position of the upper element 2.
- the upper element 2 must withstand significant forces due to the wind, it can be envisaged to guide it by sliding in an external structure comprising vertical posts fixed to the outside of the external wall 12. This structure can then support the roof possible 26. Instead of this structure, it is also possible to envisage a central guide post, extending from the bottom of the tank and overlapped by a sealed protuberant part provided in the center of the cover 20.
- a mechanical system (not shown) is provided to ensure the closing of a flap or valve (not shown) mounted on the pipe 35 in order to stop the flow of the liquid.
- FIG. 3 The example shown in Figure 3 is similar to that of Figure 1, except that a mattress 40 of the intermediate gas 29 is held between the stored liquid 15 and the bottom 21 of the cover in order to prevent contact between them
- the bottom 21 is preferably flat or convex upwards.
- the intermediate gas 29 is subjected to the pressure supporting the upper element 2, for example 10 kPa with may ⁇ m ; which corresponds to a difference in level of a maximum of one meter between the surfaces 30 and 31 of the sealing liquid 17 if it has the density of water.
- the sealing jacket 16 also extends under the bottom 10 of the tank, by virtue of a second sealed flat bottom 44 located at a small distance below the bottom 10.
- the second liquid 17 can be a non-polluting liquid, such as water, and any leakage of the first liquid into the second will be easily detected.
- the double jacket also offers a more secure seal in the opposite direction, between the environment and the inside of the tank. In all cases, it is possible to choose and control at will the composition of the intermediate gas 29 which is in contact with the two liquids.
- the plan shape of the tank according to the invention can be arbitrary, depending on the specific conditions such as its size, the materials used, the space available and whether the tank is buried or not.
- Figures 6 to 8 show some examples of plan shapes.
- the circular shape of the elements 1 and 2 according to Figure 6 is generally preferred from the construction point of view.
- the bottom of the cover 20 can be conical, but also curved, faceted or even flat. In the rectangular shape shown in FIG. 7, the bottom of the cover 20 is preferably pyramidal, as in the oval shape with two straight sides in FIG. 8.
- two or more reservoirs according to the invention can be juxtaposed and associated as shown in FIG. 9, so that their sealing sleeves 16 have a common part 16 'between the respective interior walls. 11 of the two tanks. It follows that the vertical outer envelope is formed by an outer wall 12 common to the two reservoirs, and that the sealing liquid is also common to them. This does not pose a level problem since the level of the liquid stored in each tank can vary without modifying the level of the sealing liquid.
- Reservoirs according to the invention can be produced in any size and with any waterproof material, and can be used for all kinds of applications, especially those which require a tight separation between the stored liquid and the atmosphere.
- an interesting application may be that of the storage and transport of mineral water in order to deliver it in bulk to consumers.
- the use of a tank according to the invention would make it possible to avoid the high costs of transporting and storing bottled water.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Packages (AREA)
- Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
- External Artificial Organs (AREA)
- Catching Or Destruction (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9415148 | 1994-12-13 | ||
FR9415148A FR2727943B1 (en) | 1994-12-13 | 1994-12-13 | WATERPROOF TANK WITH VARIABLE VOLUME FOR THE STORAGE OF A LIQUID |
PCT/FR1995/001597 WO1996018559A1 (en) | 1994-12-13 | 1995-12-05 | Variable volume sealed container for storing liquids |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0796211A1 true EP0796211A1 (en) | 1997-09-24 |
EP0796211B1 EP0796211B1 (en) | 1998-10-07 |
Family
ID=9469856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95941762A Expired - Lifetime EP0796211B1 (en) | 1994-12-13 | 1995-12-05 | Variable volume sealed container for storing liquids |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0796211B1 (en) |
JP (1) | JPH11506408A (en) |
AT (1) | ATE171918T1 (en) |
AU (1) | AU4307496A (en) |
CA (1) | CA2205000A1 (en) |
DE (1) | DE69505272T2 (en) |
FR (1) | FR2727943B1 (en) |
WO (1) | WO1996018559A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE515727C2 (en) * | 1999-02-04 | 2001-10-01 | Solsam Sunenergi Ab | Water tank, tank cap and procedure for storing water |
AT10556U1 (en) | 2007-12-11 | 2009-06-15 | Vogl Gerhard | CONTAINER FOR RECEIVING FLUID FOOD |
KR101368189B1 (en) * | 2012-07-02 | 2014-02-28 | 주식회사 우진 | Multi volume tank prover |
CN102900948B (en) * | 2012-10-09 | 2014-09-17 | 陕西有色建设有限公司 | Vertical lifting type butting construction method for air-jacking upside-down mounting of air cabinet |
DE102017118952A1 (en) * | 2017-08-18 | 2019-02-21 | Xl Beteiligungen Gmbh & Co. Kg | buffer memory |
CN107572137A (en) * | 2017-09-30 | 2018-01-12 | 广东产品质量监督检验研究院 | A kind of portable food detection sampling servicing unit |
FR3120614B1 (en) | 2021-03-11 | 2023-05-12 | Pep Tech | Equipment for storing a liquid provided with a floating cover and use of such equipment |
CN118004610B (en) * | 2024-04-09 | 2024-06-21 | 山东启华消防工程有限公司 | Raw material transfer tank for fireproof paint production |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1636539A (en) * | 1925-10-12 | 1927-07-19 | John H Wiggins | Liquid-storage tank |
US1823256A (en) * | 1927-09-12 | 1931-09-15 | Edwin M Clark | Oil tank and method of storing oil |
FR802831A (en) * | 1935-06-04 | 1936-09-16 | Anciens Ets Barbier | Improvements to distributor tanks |
FR1541092A (en) * | 1967-08-23 | 1968-10-04 | Giovanola Freres Sa | Inflatable seal floating lid |
US4230138A (en) * | 1977-03-31 | 1980-10-28 | Nihon Sekiyu Hanbai Kabushiki Kaisha | Method of storing heavy hydrocarbon oil and vessel therefor |
-
1994
- 1994-12-13 FR FR9415148A patent/FR2727943B1/en not_active Expired - Fee Related
-
1995
- 1995-12-05 AT AT95941762T patent/ATE171918T1/en not_active IP Right Cessation
- 1995-12-05 AU AU43074/96A patent/AU4307496A/en not_active Abandoned
- 1995-12-05 CA CA002205000A patent/CA2205000A1/en not_active Abandoned
- 1995-12-05 DE DE69505272T patent/DE69505272T2/en not_active Expired - Fee Related
- 1995-12-05 JP JP8518349A patent/JPH11506408A/en active Pending
- 1995-12-05 EP EP95941762A patent/EP0796211B1/en not_active Expired - Lifetime
- 1995-12-05 WO PCT/FR1995/001597 patent/WO1996018559A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9618559A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1996018559A1 (en) | 1996-06-20 |
AU4307496A (en) | 1996-07-03 |
ATE171918T1 (en) | 1998-10-15 |
EP0796211B1 (en) | 1998-10-07 |
DE69505272T2 (en) | 1999-06-02 |
FR2727943B1 (en) | 1997-01-24 |
CA2205000A1 (en) | 1996-06-20 |
DE69505272D1 (en) | 1998-11-12 |
JPH11506408A (en) | 1999-06-08 |
FR2727943A1 (en) | 1996-06-14 |
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