EP0177400B1 - Perfectionnement aux réservoirs à toit flottant pour liquides, notamment aux réservoirs de stockage utilisés dans le domaine électro-nucléaire - Google Patents

Perfectionnement aux réservoirs à toit flottant pour liquides, notamment aux réservoirs de stockage utilisés dans le domaine électro-nucléaire Download PDF

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Publication number
EP0177400B1
EP0177400B1 EP85401823A EP85401823A EP0177400B1 EP 0177400 B1 EP0177400 B1 EP 0177400B1 EP 85401823 A EP85401823 A EP 85401823A EP 85401823 A EP85401823 A EP 85401823A EP 0177400 B1 EP0177400 B1 EP 0177400B1
Authority
EP
European Patent Office
Prior art keywords
tank
roof
floating roof
level
wall
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
Application number
EP85401823A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0177400A1 (fr
Inventor
Claude Barbillat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electricite de France SA
Original Assignee
Electricite de France SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP0177400A1 publication Critical patent/EP0177400A1/fr
Application granted granted Critical
Publication of EP0177400B1 publication Critical patent/EP0177400B1/fr
Expired legal-status Critical Current

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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
    • B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
    • B65D88/48—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with fluid means acting on the seal

Definitions

  • the invention relates to floating roof tanks for liquids.
  • Such tanks are used in particular as storage tanks in the electro-nuclear field for liquids such as degassed demineralized water.
  • a floating roof tank comprising a cylindrical wall, a floating roof tightly connected to said wall which surrounds it by a flexible membrane, this membrane defining with the wall of the tank a space suitable for receiving a liquid of back pressure, and means for protecting the tank against overfilling when the roof is in the high position, in accordance with the preamble of claim 1.
  • a typical example of such a tank is illustrated in FR-A-2 526 405.
  • the space defined by the membrane and the wall of the tank, space communicating with the outside receives a liquid of back pressure acting essentially as a lubricant for the membrane during the movements of the floating roof, and incidentally allowing, at least in certain positions, a centering of said roof relative to the cylindrical wall of the tank.
  • a compensating tank separate from the tank.
  • the tank contains a compensating liquid, denser and immiscible with the stored liquid, and the level of which is adjusted to automatically maintain the pressure exerted on the fixed roof of the tank.
  • a solution would not be suitable for a floating roof tank with volume of backpressure liquid, since it is used for very high overpressures, and the presence of a floating roof would imply having the compensation tank at a very low level. high, which would result in a structure that would be unthinkable in practice.
  • the invention aims to avoid the drawbacks of the previously mentioned prior techniques.
  • the main object of the invention is therefore to provide a floating roof tank whose structure allows safe protection against overpressure due to overfilling of the tank, when the roof is in the high position, thanks to an efficient evacuation of the liquid in this overfilling situation, while preserving as much as possible the liquid stored in the tank from contact with the ambient air, this in particular for an application in the electro-nuclear field.
  • Another object of the invention is to have a simple structure and a reasonable manufacturing cost for the tank.
  • the technical problem set out above is resolved by providing a floating roof tank for liquids, characterized in that the protection means are mainly constituted by an overflow pipe mounted outside the tank on the wall thereof, and communicating with the interior of the tank through an orifice provided in the lower part of the wall thereof, said overflow pipe having a butt-shaped portion turned downwards and arranged at a height corresponding to the predetermined maximum level of the liquid in the tank in the high position of the roof, and by a tube forming a siphon trap connected to the overflow pipe in the vicinity of the upper part of the butt of said pipe, and open to the open air at its other end.
  • the protection means are mainly constituted by an overflow pipe mounted outside the tank on the wall thereof, and communicating with the interior of the tank through an orifice provided in the lower part of the wall thereof, said overflow pipe having a butt-shaped portion turned downwards and arranged at a height corresponding to the predetermined maximum level of the liquid in the tank in the high position of the roof, and by a tube forming
  • the overflow pipe communicates with the interior of the tank through an orifice arranged at a level lower than that occupied by the ply of the flexible membrane, regardless of the position of the roof, and / or at a level lower than that occupied by low stops provided inside the tank and on which the roof rests in the low position.
  • the overflow pipe stock is advantageously wedged at a level slightly exceeding that occupied by the liquid in the tank when the roof is brought, when filling the tank, pressing against high stops defining the height position. maximum of said roof.
  • a floating roof tank for liquids 1 comprises a generally cylindrical wall 2, a floating roof 3 produced in an open box on the top, and a flexible membrane 4 sealingly connecting the periphery of the floating roof to the side wall of the tank.
  • the membrane 4 is here hooked in 5 at mid-height of the tank, but the invention would also apply to the case of a membrane hung on the upper part of the tank.
  • the space 6, open to the outside, defined by the membrane 4 and the wall 2 of the reservoir is suitable for receiving a back-pressure liquid essentially serving as a lubricant for the flexible membrane 4, avoiding in particular the formation of folds during the various movements of the floating roof 3, and incidentally allowing, at least in certain positions, a centering of said roof relative to the wall of the tank.
  • FIG 1 schematically illustrates a number of equipment which is usually provided on floating roof tanks for liquids; this equipment will be briefly recalled, given that the person skilled in the art is well accustomed to the presence of this equipment.
  • an advantageous measure consists in providing a dimensioning of the floating roof with its guide wheels which always remains less than the diameter of the tank, so as to make possible, although this is not desirable, a complete reversal of the roof without jamming by the wall of the tank.
  • the floating roof 3 is also equipped with an analog inclinometer 9 to which a cable 10 is connected, equipped with a slack and provided with a counterweight, for returning the reading and the alarms to the control room, which allows you to follow the inclination of the roof in case of hanging in the intermediate position, operating in the lower part or emptying the tank.
  • the floating roof 3 is also equipped, in the vicinity of the membrane-roof junction, with peripheral vents 11 connected by a venting manifold 12 provided with a valve 13, and possibly with an air purge 14 in the center of the roof in case it does not have sufficient taper to collect air at the periphery.
  • the floating roof is finally equipped with a vacuum breaker tubing 34 forming a natural valve which protects the tank against excessive depression during emptying when said roof is in the low position, or when the latter gets stuck in a position intermediate (moreover, in this case, this tubing advantageously serves as an outlet in the event of overpressure).
  • the tank itself As for the tank itself, it is equipped with a manual venting below the level of the attachment points 5 of the membrane, with several vents distributed equally on the periphery and connected by a manifold 15 with an outlet pipe to a valve. 16; provision is also made at a low level for the inlet 17, outlet 18, and drain 19 pipes for the reservoir liquid.
  • a circular walkway 20 at the top of the tank makes it easier to visit the roof and the membrane.
  • the movement of the floating roof is limited by low stops 21 and high 22, and indication and alarm equipment (not shown) are provided for checking the extreme high and low levels in the control room.
  • the tank is equipped with means making it possible to drain the volume of backpressure liquid when the roof is in the high position. As illustrated in FIGS. 1 and 2, these means include a drain outlet 23 passing through the wall 2 at the top of the tank and connected to a conventional drain pipe 24 provided with a valve 25 and external to said wall.
  • an external overflow pipe 26 in the form of a butt provided in the upper part with a siphon-breaking conduit 27 which makes it possible to stop the emptying when it is started with the overflow and thus avoid a total emptying of the tank; in this case, the filling of the reservoir will be continued until the level of the waterline 28 of the liquid, which moreover corresponds substantially to the surface level of the back-pressure liquid, reaches the level 29 of the excess full, slightly above the level occupied at the start of the top stop, which is an additional safety measure to be sure that the floating roof is at its maximum height.
  • the overflow pipe 26 communicates with the interior of the tank through an orifice provided in the lower part of the wall of said tank, at a level always below the fold of the membrane 4, so as in particular to eliminate any risk of obstruction by said membrane; this orifice is also preferably placed lower than the level of the low stops 21.
  • the butt end of the pipe 26 is wedged at a level 29 (FIG. 2) higher than the floatation level 28 in simple upper stop of the roof.
  • Line 26 thus contains a plug of liquid of variable volume which makes it possible to avoid any contact of the liquid contained in the tank with the ambient air, and therefore a regasage of said liquid.
  • the tank is then isolated by closing the valve of the inlet pipe 17, then the valve 25 of the drain outlet orifice 23 is opened; this, provided for this purpose at a level lower than that 28 of the waterline when the roof is in high stop, allows a complete emptying of the volume of backpressure liquid by the natural effect of the pressure of the liquid of the reservoir which tends to push the flexible membrane 4 radially, and therefore to expel this liquid until the entire part of the membrane which is lower than the drain orifice is applied against the interior wall of the reservoir. It then suffices to actuate means for filling with back-pressure liquid, means preferably arranged in the upper part of the reservoir at a level close to that of the emptying means, and constituted for example (FIG. 1) by a pipe 30, a valve 31 and a volumetric counter 32 allowing the admission of a predetermined volume.
  • the level of the drain opening is important because when the drain valve 25 is opened, the roof drops slightly as the back pressure liquid is expelled; it is therefore necessary to be certain that the level 28 of the waterline remains higher than that of the drain outlet orifice 23, so that the emptying is complete.
  • Figures 3 and 4 illustrate a means for avoiding the obstruction of the drain outlet orifice by the flexible membrane during the emptying of the back pressure liquid; this means is for example made in the form of a flat element 33 fixed on the side wall 2 and the projecting portion of which avoids the obturation of the drain outlet orifice 23 while allowing the liquid to pass laterally.
  • demineralized water will advantageously be used as back pressure liquid; the design of the floating roof tank of the invention also makes it possible to avoid bringing the liquid from the tank into contact with the air, which avoids having to redegas this liquid (communications in the open air by the siphon breaker of the overflow piping and the vacuum breaker manifold introduce only a negligible disturbance, because the siphon breaker, which is very far from its communication with the tank in the lower part, and the vacuum breaker tubing encloses a lower cap of liquid which forms an effective screen).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Float Valves (AREA)
EP85401823A 1984-09-27 1985-09-19 Perfectionnement aux réservoirs à toit flottant pour liquides, notamment aux réservoirs de stockage utilisés dans le domaine électro-nucléaire Expired EP0177400B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8414859 1984-09-27
FR8414859A FR2570682B1 (fr) 1984-09-27 1984-09-27 Perfectionnement aux reservoirs a toit flottant pour liquides, notamment aux reservoirs de stockage utilises dans le domaine electronucleaire

Publications (2)

Publication Number Publication Date
EP0177400A1 EP0177400A1 (fr) 1986-04-09
EP0177400B1 true EP0177400B1 (fr) 1988-03-16

Family

ID=9308143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401823A Expired EP0177400B1 (fr) 1984-09-27 1985-09-19 Perfectionnement aux réservoirs à toit flottant pour liquides, notamment aux réservoirs de stockage utilisés dans le domaine électro-nucléaire

Country Status (6)

Country Link
US (1) US4723682A (ja)
EP (1) EP0177400B1 (ja)
JP (1) JPS61184493A (ja)
CA (1) CA1254017A (ja)
DE (1) DE3561872D1 (ja)
FR (1) FR2570682B1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893023A (en) * 1987-10-14 1990-01-09 Homyk William A Radiation shielding apparatus
US4851185A (en) * 1987-10-14 1989-07-25 Homyk William A Radiation shielding method and apparatus
US4971217A (en) * 1989-05-12 1990-11-20 Robertson William L Tensioned floatation cover with slip ring connection
US20040188438A1 (en) * 2003-03-26 2004-09-30 King Richard P. Full contact floating roof
CA2454084A1 (en) * 2003-12-11 2005-06-11 Collin Watson Storage tank roof protection system
US7172177B2 (en) * 2004-04-15 2007-02-06 Aeration Industries International, Inc. Aerator
NL1032192C2 (nl) * 2006-07-18 2008-01-21 Enraf Bv Opslagtank voor een vloeistof.
CA2657653A1 (en) * 2006-07-26 2008-01-31 Bp Corporation North America Inc. Multi-product tank
NL1034710C2 (nl) * 2007-11-16 2009-05-19 Genap B V Vloeistofreservoir.
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems
CN110294221B (zh) * 2019-06-29 2024-03-12 天津长瑞大通流体控制系统有限公司 一种防泄漏浮顶罐以及防止泄漏的方法
CN110808110B (zh) * 2019-10-30 2021-08-03 岭澳核电有限公司 核电厂浮顶盖罐隔膜套的安装方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR841839A (fr) * 1938-01-29 1939-05-31 Procédé et dispositif de stockage de liquides à l'abri de l'air
US2538412A (en) * 1945-12-29 1951-01-16 Infilco Inc Sludge heater
US2712395A (en) * 1950-08-29 1955-07-05 John H Wiggins Overflow device for liquid storage tanks
US2718977A (en) * 1952-07-09 1955-09-27 John H Wiggins Weather roof for floating tank roofs
SE7613764L (sv) * 1976-12-07 1978-06-08 Atomenergi Ab Kernreaktor
US4199074A (en) * 1978-09-14 1980-04-22 Donald M. Gammell Enclosed seal for open top volatile liquid storage tanks
US4495137A (en) * 1981-01-21 1985-01-22 Doryokuro Kakunenryo Kaihatsu Jigyodan Nuclear reactor
US4438863A (en) * 1981-08-17 1984-03-27 Globe Linings, Inc. Gas venting floating cover
FR2517793A1 (fr) * 1981-12-03 1983-06-10 Electricite De France Dispositif de protection d'une capacite telle qu'un circuit ou un recipient contenant un fluide sous pression
FR2526405B1 (fr) * 1982-05-06 1986-07-11 Bignier Schmid Laurent Perfectionnements aux reservoirs a toit flottant, notamment aux reservoirs de stockage dans une centrale nucleaire
GB2148374A (en) * 1983-10-19 1985-05-30 Bignier Schmid Laurent Liquid-storage tank with floating roof

Also Published As

Publication number Publication date
FR2570682A1 (fr) 1986-03-28
CA1254017A (en) 1989-05-16
JPS61184493A (ja) 1986-08-18
EP0177400A1 (fr) 1986-04-09
US4723682A (en) 1988-02-09
FR2570682B1 (fr) 1987-01-09
DE3561872D1 (en) 1988-04-21

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