EP0796211B1 - Reservoir etanche a volume variable pour le stockage d'un liquide - Google Patents
Reservoir etanche a volume variable pour le stockage d'un liquide Download PDFInfo
- Publication number
- EP0796211B1 EP0796211B1 EP95941762A EP95941762A EP0796211B1 EP 0796211 B1 EP0796211 B1 EP 0796211B1 EP 95941762 A EP95941762 A EP 95941762A EP 95941762 A EP95941762 A EP 95941762A EP 0796211 B1 EP0796211 B1 EP 0796211B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- liquid
- floating cover
- cover
- volume
- 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.)
- Expired - Lifetime
Links
Images
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 variable volume sealed tank for the storage of a liquid, comprising a lower element, forming an open tank upwards and arranged to contain a variable volume of the liquid to be stored, said first liquid, and an upper element mounted on the lower element so as to ensure tight sealing of the tank and slide vertically when the volume of the first liquid varies, the lower element comprising, around the tank, a sealing jacket extending over the entire height of the tank, open towards the high and containing a second liquid between two peripheral walls, the element upper with a floating cover and a vertical skirt integral with the cover and immersing in the second liquid in the sealing jacket.
- Such a tank can be intended for the storage and possibly for the transport of all kinds of liquid products, especially those which should be avoided from contact with the atmosphere, for example for reasons of hygiene, conservation, security and environmental protection. This is particularly the case for drinks or other liquid food products such as drinking water, mineral water, milk, or hydrocarbons presenting risks of evaporation, pollution or explosion, or still liquids to be kept away from air to avoid their oxidation, like fruit juice or wine, or to avoid the emission of odors as it is the case with slurry.
- drinks or other liquid food products such as drinking water, mineral water, milk, or hydrocarbons presenting risks of evaporation, pollution or explosion, or still liquids to be kept away from air to avoid their oxidation, like fruit juice or wine, or to avoid the emission of odors as it is the case with slurry.
- variable volume tank such as a flexible tank avoids most of these problems but can present other well known difficulties related to materials, stability and durability flexible walls.
- Patent FR-A-802 831 describes a tank for volatile liquids intended to remove evaporation losses. It includes a bowl and a bell-shaped cover containing air. When filling with liquid, the air is compressed and the bell raises.
- This reservoir has in particular the disadvantage of containing, in all cases of use, air in the tank, between the liquid to be stored and the cover. This air can then mix with the vapors of the stored liquid. Therefore, no sealing is not guaranteed and the stored liquid may be soiled. On the other hand, a liquid which does not must not be in contact with air cannot be stored in such a tank.
- 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 resting directly on the hydrocarbon and extending beyond the wall of the tank to end with a peripheral part which plunges into the cavity sealing.
- This tank is at constant volume thanks to an increase in volume of water on which the hydrocarbon rests to compensate for the decrease in 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.
- US-A-1,823,256 also describes a tank for hydrocarbons with almost constant volume including in its upper part an annular cavity filled with water.
- the tank also has a floating cover resting on the hydrocarbon and extending by a vertical skirt which plunges into said cavity.
- This device works thanks to a balance established between hydrocarbon and water 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 down and stay in contact with the fluid if the level goes down.
- the present invention aims to avoid these drawbacks by creating a volume reservoir variable which consists of essentially rigid elements, ensures excellent tightness against the atmosphere and high security against the risks of pollution of the product or the environment and allows, if necessary, to preserve the liquid stored away from contact with air.
- the invention relates to a reservoir of the kind indicated in the preamble, characterized in that the floating cover rests directly on the first liquid, in that said floating cover has a bottom and a peripheral wall extending upward from this bottom and sealingly connected to an edge upper of the skirt, the height of said peripheral wall and of said skirt being respectively at least equal to the height of the tank, so that said cover floating exactly follows the variation in the level of said first liquid over the entire height of the tank, and in that an intermediate gas is retained captive in the element upper by respective free surfaces of the first and second liquid.
- the upper element of the tank can go up and down like the bell of a gasometer, but these movements are directly dictated by variations in the level of the first liquid stored in the tank.
- the upper element the construction of which may be entirely rigid, guarantees a suitable and durable seal against the atmosphere, thanks to its plunging skirt permanence in the second liquid.
- the presence of a volume of gas buffer intermediate between the free surfaces of the first and second liquid inside the upper element, and which may have a volume substantially constant allows on the one hand to avoid any contact between the two liquids and, on the other hand, avoid contact of the first liquid with air or oxygen, if this gas intermediate is a neutral gas, for example nitrogen.
- the sealing jacket extends also below the tank so as to completely surround the tank, except towards the high.
- said peripheral walls comprise a peripheral wall inside, separating the sealing jacket from the inside of the tank, and a wall external device having an upper edge located lower than an upper edge of the inner peripheral wall.
- 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.
- these may include 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.
- the reservoir shown mainly consists a stationary lower element 1 and an upper element 2 mounted on the element lower 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 is will describe later.
- the lower element 1 has a slightly waterproof bottom 10 conical, an inner peripheral wall 11 connected to the bottom 10, a wall external device 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.
- a first liquid 15 which is the liquid to be stored in the tank.
- the walls 11 and 12 and the annular bottom 13 define together 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 outer peripheral wall 12 has an edge upper 18 located a little lower than the upper edge 19 of the peripheral wall interior 11, to prevent any risk of accidental spillage of the liquid seal 17 inside the tank 14.
- the upper element 2 has a cover 20 which closes the major part of the upper opening of the tank 14 and floats on the first liquid 15 contained in this tank.
- the cover 20 includes a circular bottom 21 and a peripheral wall cylindrical 22.
- the bottom 21 is convex downwards, for example conical, to avoid to hold gas under it. It can be provided with an inspection hatch 23 closing sealingly 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 outdoors.
- the skirt 24 slides inside the jacket 16, where its lower edge 27 is dipped in permanence in the sealing liquid 17, which prevents any passage of gas through a either way between the inside and outside of the tank.
- Wall 22, ring 25 and the skirt 24 define an annular chamber 28 in which a volume of gas intermediate 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 the pressure atmospheric, 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 the skirt.
- Chamber 28 can be connected to a sniffer of decompression 34, making it possible to adjust the pressure of the intermediate gas 29 and capable of be connected to a supply or storage tank for this gas (not shown).
- Known level detection means can be installed in the sealing jacket 16 for monitoring the levels of 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 other control means.
- 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 guides such as slides or rollers (not shown). So these organs of guides are protected from the stored liquid 15 and can be lubricated by the liquid sealing 17. The level and volume of the stored liquid 15 are therefore visible directly by the position of the upper element 2.
- the pressure to be exerted by the stored liquid 15 on the bottom 21 of the cover 20 does not need to be high, given the large surface of the cover.
- a pressure of less than 10 kPa (0.1 bar) is sufficient, i.e. that the cover 20 sinks slightly say the stored liquid 15, according to the surface and weight of the float cover.
- An overpressure of the intermediate gas in the annular chamber 28 is not necessary.
- the upper element 2 has to withstand significant wind forces, it is possible to consider guiding it by sliding in an external structure comprising vertical posts fixed to the outside of the outer wall 12. This structure can then support the possible roof 26. Instead of this structure, we can also consider a central guide post, extending from the bottom of the tank and overlapped by a waterproof protruding part provided in the center of the cover 20.
- the tank 14 In the position shown in Figure 2, the tank 14 is practically empty and the bottom 21 of the cover can rest on the bottom 10 of corresponding shape of the tank.
- a mechanical system for closing a flap or valve (not shown) mounted on the pipe 35 in order to stop the flow of the liquid.
- the sealing jacket 16 also extends under the bottom 10 of the tank, thanks to a second sealed flat bottom 44 located at a small distance below the bottom 10. This results in a double security envelope around the tank. This is especially useful for ensuring the maintenance and checking the tightness between the tank and the environment in the case of storage of polluting liquids, such as hydrocarbons.
- the second liquid 17 can be a non-polluting liquid, such as water, and a possible leak of the first liquid in the second will be easily detected.
- the double jacket also offers more water-tightness safe in the opposite direction, between the environment and the inside of the tank. In all the case, it is possible to choose and control at will the composition of the gas intermediate 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 special conditions such as its size, the materials used, the space available and whether the tank is buried or not.
- Figures 5 to 7 show some examples of plan shapes.
- the circular shape of elements 1 and 2 according to Figure 5 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 form rectangular shown in Figure 6, the bottom of the cover 20 is preferably pyramidal, as well as in the oval shape with two straight sides in Figure 7.
- two or more tanks depending on the invention can be juxtaposed and associated as shown in Figure 8, so their sealing sleeves 16 have a common part 16 'between the walls respective interior 11 of the two tanks.
- the outer shell vertical is formed by an outer wall 12 common to the two tanks, and that sealing liquid is also common to them. This poses no problem of level since the level of the liquid stored in each tank can vary without change the sealant level.
- Tanks according to the invention can be produced in any size and with any waterproof material, and can be used for all kinds applications, especially those that require a tight separation between the liquid stored and the atmosphere.
- one application interesting may be that of storing and transporting mineral water to deliver it in bulk to consumers. In countries where regulations prohibit two successive packaging of these waters before retail sale, the use of a tank according to the invention would avoid the high costs of transport and storage of 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)
- Catching Or Destruction (AREA)
- External Artificial Organs (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Description
- la figure 1 est une vue schématique en coupe verticale d'une première forme de réalisation d'un réservoir selon l'invention, lorsque le réservoir est plein,
- la figure 2 représente le réservoir de la figure 1 lorsqu'il est pratiquement vide,
- la figure 3 représente une autre variante de la réalisation selon la figure 1,
- la figure 4 est une vue analogue à la figure 2 et représente une variante de réservoir à double enveloppe offrant une sécurité accrue,
- les figures 5 à 7 sont des vues en plan schématiques montrant différentes formes possibles d'un réservoir selon l'invention, et
- la figure 8 est une vue schématique en coupe verticale de deux réservoirs jumelés.
Claims (7)
- Réservoir étanche à volume variable pour le stockage d'un liquide, comportant un élément inférieur (1), formant une cuve (14) ouverte vers le haut et agencée pour contenir un volume variable du liquide à stocker, dit premier liquide (15), et un élément supérieur (2) monté sur l'élément inférieur de manière à assurer une obturation étanche de la cuve et à coulisser verticalement lorsque le volume du premier liquide varie, l'élément inférieur (1) comportant, autour de la cuve (14), une chemise d'étanchéité (16) s'étendant sur toute la hauteur de la cuve, ouverte vers le haut et contenant un second liquide (17) entre deux parois périphériques (11, 12), l'élément supérieur (2) comportant un couvercle flottant (20) et une jupe verticale (24) solidaire du couvercle et plongeant dans le second liquide (17) dans la chemise d'étanchéité (16), caractérisé en ce que ledit couvercle flottant s'appuye directement sur le premier liquide, en ce que ledit couvercle flottant (20) comporte un fond (21) et une paroi périphérique (22) s'étendant vers le haut à partir de ce fond et raccordée de manière étanche à un bord supérieur de la jupe (24), la hauteur de ladite paroi périphérique (22) et de ladite jupe (24) étant respectivement au moins égale à la hauteur de la cuve (14), de sorte que ledit couvercle flottant (20) suit exactement la variation du niveau dudit premier liquide (15) sur toute la hauteur de la cuve (14), et en ce qu'un gaz intermédiaire (29) est retenu captif dans l'élément supérieur par des surfaces libres respectives (30, 31) du premier et du second liquide.
- Réservoir selon la revendication 1, caractérisé en ce que la chemise d'étanchéité (16) s'étend aussi en dessous de la cuve (14) de façon à entourer complètement la cuve, sauf vers le haut.
- Réservoir selon la revendication 1 ou 2, caractérisé en ce que lesdites parois périphériques comprennent une paroi périphérique intérieure (11), séparant la chemise d'étanchéité (16) de l'intérieur de la cuve (14), et une paroi périphérique extérieure (12) ayant un bord supérieur (18) situé plus bas qu'un bord supérieur (19) de la paroi périphérique intérieure (11).
- Réservoir selon la revendication 1, caractérisé en ce que le fond (21) du couvercle flottant (20) est convexe vers le bas.
- Réservoir selon la revendication 1, caractérisé en ce que le fond (21) du couvercle flottant (20) est convexe vers le haut.
- Réservoir selon l'une des revendications précédentes, caractérisé en ce que des moyens de remplissage et de vidange de la cuve comportent au moins une conduite (35) passant sous le réservoir et débouchant dans la cuve (14) à travers un fond (10) de celle-ci.
- Réservoir selon l'une des revendications 1 à 5, caractérisé en ce que des moyens de remplissage et de vidange de la cuve comportent au moins une conduite (42) montée sur l'élément supérieur (2) et débouchant dans la cuve (14) à travers le couvercle flottant (20).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9415148 | 1994-12-13 | ||
FR9415148A FR2727943B1 (fr) | 1994-12-13 | 1994-12-13 | Reservoir etanche a volume variable pour le stockage d'un liquide |
PCT/FR1995/001597 WO1996018559A1 (fr) | 1994-12-13 | 1995-12-05 | Reservoir etanche a volume variable pour le stockage d'un liquide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0796211A1 EP0796211A1 (fr) | 1997-09-24 |
EP0796211B1 true EP0796211B1 (fr) | 1998-10-07 |
Family
ID=9469856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95941762A Expired - Lifetime EP0796211B1 (fr) | 1994-12-13 | 1995-12-05 | Reservoir etanche a volume variable pour le stockage d'un liquide |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0796211B1 (fr) |
JP (1) | JPH11506408A (fr) |
AT (1) | ATE171918T1 (fr) |
AU (1) | AU4307496A (fr) |
CA (1) | CA2205000A1 (fr) |
DE (1) | DE69505272T2 (fr) |
FR (1) | FR2727943B1 (fr) |
WO (1) | WO1996018559A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE515727C2 (sv) * | 1999-02-04 | 2001-10-01 | Solsam Sunenergi Ab | Vattentank, tanklock och förfarande vid lagring av vatten |
AT10556U1 (de) | 2007-12-11 | 2009-06-15 | Vogl Gerhard | Behalter zur aufnahme von flussigfutter |
KR101368189B1 (ko) * | 2012-07-02 | 2014-02-28 | 주식회사 우진 | 다중 부피 기준탱크 |
CN102900948B (zh) * | 2012-10-09 | 2014-09-17 | 陕西有色建设有限公司 | 一种直升式气柜气顶倒装对接施工方法 |
DE102017118952A1 (de) * | 2017-08-18 | 2019-02-21 | Xl Beteiligungen Gmbh & Co. Kg | Pufferspeicher |
CN107572137A (zh) * | 2017-09-30 | 2018-01-12 | 广东产品质量监督检验研究院 | 一种便携式食品检测采样辅助装置 |
FR3120614B1 (fr) | 2021-03-11 | 2023-05-12 | Pep Tech | Equipement de stockage d’un liquide pourvu d’un couvercle flottant et utilisation d’un tel équipement |
CN118004610B (zh) * | 2024-04-09 | 2024-06-21 | 山东启华消防工程有限公司 | 一种防火涂料生产用的原料转运罐 |
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 (fr) * | 1935-06-04 | 1936-09-16 | Anciens Ets Barbier | Perfectionnements aux réservoirs distributeurs |
FR1541092A (fr) * | 1967-08-23 | 1968-10-04 | Giovanola Freres Sa | Couvercle flottant de fermeture à joint gonflable |
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/fr not_active Expired - Fee Related
-
1995
- 1995-12-05 CA CA002205000A patent/CA2205000A1/fr not_active Abandoned
- 1995-12-05 JP JP8518349A patent/JPH11506408A/ja active Pending
- 1995-12-05 EP EP95941762A patent/EP0796211B1/fr not_active Expired - Lifetime
- 1995-12-05 AT AT95941762T patent/ATE171918T1/de not_active IP Right Cessation
- 1995-12-05 DE DE69505272T patent/DE69505272T2/de not_active Expired - Fee Related
- 1995-12-05 WO PCT/FR1995/001597 patent/WO1996018559A1/fr active IP Right Grant
- 1995-12-05 AU AU43074/96A patent/AU4307496A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE69505272T2 (de) | 1999-06-02 |
CA2205000A1 (fr) | 1996-06-20 |
WO1996018559A1 (fr) | 1996-06-20 |
ATE171918T1 (de) | 1998-10-15 |
FR2727943B1 (fr) | 1997-01-24 |
FR2727943A1 (fr) | 1996-06-14 |
EP0796211A1 (fr) | 1997-09-24 |
DE69505272D1 (de) | 1998-11-12 |
JPH11506408A (ja) | 1999-06-08 |
AU4307496A (en) | 1996-07-03 |
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