EP0177399A1 - Schwimmende Behälterdecke eines Speichertanks, insbesondere verwendet in einer Elektronuklearanlage - Google Patents

Schwimmende Behälterdecke eines Speichertanks, insbesondere verwendet in einer Elektronuklearanlage Download PDF

Info

Publication number
EP0177399A1
EP0177399A1 EP85401821A EP85401821A EP0177399A1 EP 0177399 A1 EP0177399 A1 EP 0177399A1 EP 85401821 A EP85401821 A EP 85401821A EP 85401821 A EP85401821 A EP 85401821A EP 0177399 A1 EP0177399 A1 EP 0177399A1
Authority
EP
European Patent Office
Prior art keywords
tank
roof
floating roof
liquid
box
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.)
Withdrawn
Application number
EP85401821A
Other languages
English (en)
French (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 EP0177399A1 publication Critical patent/EP0177399A1/de
Withdrawn legal-status Critical Current

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
    • 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 small mechanical valve is provided on the roof, sometimes called a breathing valve, and adjusted to a relatively low calibration in both directions (approximately 30 mbar for example); this valve, acting as vacuum breaker, must only protect the tank with a roof in the low stop position.
  • FIG. 1 Another known type of device, illustrated in US-A-1904339, comprises a vacuum tube mounted in the center of a membrane flexible central unit closing the interior space of a ring float.
  • a vacuum tube mounted in the center of a membrane flexible central unit closing the interior space of a ring float.
  • Such a device is essentially adapted to a particular floating roof structure, and in addition cannot preserve the stored liquid from contact with the ambient air.
  • the invention aims to avoid the drawbacks of the previously mentioned prior techniques.
  • An object of the invention is to provide a floating roof tank whose structure allows effective protection of the tank in the event of the roof jamming, against a vacuum at the end of draining of the liquid which it contains when the roof is in the position of low stop.
  • Another object of the invention is to radically simplify the design of the means acting as a vacuum breaker, so as to avoid as much as possible having to access it during use of the tank.
  • Another object of the invention is to have the possibility of easily adjusting the calibration of these means, and preferably both under overpressure and under depression.
  • Another object of the invention is to have a simple structure and a reasonable manufacturing cost for the tank.
  • a final object of the invention is to preserve as much as possible the liquid stored in the reservoir from contact with the ambient air, this in particular for an application in the electro-nuclear field.
  • a floating roof tank for liquids is essentially characterized in that the means on board the roof and making it possible to protect the tank against overpressure and / or depression when said roof is in the low position, or stuck in position intermediate, are constituted by a vacuum breaker tube mounted on the underside of the box forming the roof so as to put in communication the interior of said box with the liquid of the reservoir, said tube being dimensioned so that its natural calibration corresponds to a predetermined pressure.
  • the vacuum breaker tubing has the shape of a stick whose vertical branch crosses the underside of the box, and the portion of the vertical branch outside the roof box has a length lower than the height of the lower stops provided inside the tank and on which the roof rests in the low position.
  • the vertical branch of the stick advantageously comprises a lower portion and an upper portion in the extension of one another, said portions being delimited by the level occupied by the liquid in the reservoir, the lower portion having a length corresponding to a predetermined maximum depression; the upper portion of the vertical branch and the curved portion of the butt define a height of liquid corresponding to a predetermined maximum overpressure when filling the tank, so that the vacuum breaker manifold has a natural setting both in overpressure and in depression.
  • the vacuum breaker tubing advantageously has a bore corresponding both to a maximum air flow rate for the emptying phase, and to a maximum liquid flow rate for the filling phase.
  • a floating roof tank for liquids 1 has a generally cylindrical wall 2, a floating roof 3 made in an open box on top, and a flexible membrane 4 sealingly connecting the circumference of the floating roof at the side wall of the tank. It should be noted that 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 certain number of devices which are usually provided on floating roof tanks for liquids: these devices will be briefly recalled, given that the person skilled in the art is well accustomed to the presence of these devices.
  • 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 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 lines for liquid from the reservoir.
  • a circular gangway 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.
  • 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 may be provided, provided at the top with a siphon-breaking conduit 27.
  • This device allows a complete emptying of the volume of back-pressure liquid by the natural effect of the pressure of the liquid in the tank which tends to push radially the flexible membrane 4, and therefore to expel this liquid until the whole part of the membrane which is lower than the drain orifice is applied against the inner wall of the tank. 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.
  • 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 whose projecting position avoids blocking the drain outlet orifice 23 while letting the liquid pass laterally.
  • a vacuum breaker tube (34) mounted on the underside of the box forming the floating roof, so as to put the interior of said box into communication with the liquid from the tank.
  • This tubing (34) is dimensioned so that its natural calibration corresponds to a predetermined pressure and / or depression, as will be explained below.
  • the vacuum breaker tubing (34) has the shape of a stick whose vertical branch crosses the underside of the box. To avoid any risk of damage to the butt when the floating roof 3 comes to bear on the low stops 21, the portion of this vertical branch projecting from the box must have a length less than the height of said low stops.
  • the waterline 28 divides the butt 34 into a lower portion and an upper portion on either side of said line.
  • the lower part therefore contains a liquid plug which is the active part of the tank protection device, allowing complete emptying when the roof is in the low position.
  • this liquid cap provides effective protection against the regasage of the liquid contained in the tank.
  • This device is therefore very simple, and it operates automatically, which represents a significant improvement over the so-called breathing valves of the prior techniques; it is therefore therefore no longer necessary to provide accessibility during operation of the tank for the maintenance or adjustment of said valve.
  • this device can also operate at overpressure when one is no longer in a tank emptying situation, but in a situation of filling the empty tank. Indeed, at the start of filling the tank, the air initially trapped between the roof and the bottom of the tank can be evacuated through the tubing vacuum breaker (34) and air purges. If an overpressure occurs then, the previous liquid plug will go up in the tubing: it is then enough to also dimension the upper position (above the waterline 28) so that the natural calibration corresponds to a predetermined maximum overpressure during filling: as before., an upper portion defining a maximum height of liquid of 30 cm will correspond to a maximum overpressure of 30 mbar.
  • the vacuum breaker tubing (34) can therefore advantageously operate, and this in a completely natural manner, both in depression and in overpressure.
  • the bore of said tube must correspond both to a maximum air flow rate for a vacuum, during the tank emptying phase, and to a maximum liquid flow rate for an overpressure during the filling phase of said tank.
  • 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)
EP85401821A 1984-09-27 1985-09-19 Schwimmende Behälterdecke eines Speichertanks, insbesondere verwendet in einer Elektronuklearanlage Withdrawn EP0177399A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8414860 1984-09-27
FR8414860A FR2570683B1 (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 (1)

Publication Number Publication Date
EP0177399A1 true EP0177399A1 (de) 1986-04-09

Family

ID=9308144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401821A Withdrawn EP0177399A1 (de) 1984-09-27 1985-09-19 Schwimmende Behälterdecke eines Speichertanks, insbesondere verwendet in einer Elektronuklearanlage

Country Status (3)

Country Link
EP (1) EP0177399A1 (de)
JP (1) JPS61184494A (de)
FR (1) FR2570683B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194331A (zh) * 2019-06-27 2019-09-03 华陆工程科技有限责任公司 一种钢制单盘浮顶用多功能呼吸系统
CN110466899A (zh) * 2019-09-25 2019-11-19 武汉工程大学 浮顶罐的密封装置及应用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904339A (en) * 1928-02-15 1933-04-18 John H Wiggins Floating deck for liquid storage tanks
US2297985A (en) * 1939-04-08 1942-10-06 Rivers George Floating roof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904339A (en) * 1928-02-15 1933-04-18 John H Wiggins Floating deck for liquid storage tanks
US2297985A (en) * 1939-04-08 1942-10-06 Rivers George Floating roof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194331A (zh) * 2019-06-27 2019-09-03 华陆工程科技有限责任公司 一种钢制单盘浮顶用多功能呼吸系统
CN110194331B (zh) * 2019-06-27 2024-04-12 华陆工程科技有限责任公司 一种钢制单盘浮顶用多功能呼吸系统
CN110466899A (zh) * 2019-09-25 2019-11-19 武汉工程大学 浮顶罐的密封装置及应用

Also Published As

Publication number Publication date
JPS61184494A (ja) 1986-08-18
FR2570683A1 (fr) 1986-03-28
FR2570683B1 (fr) 1987-01-16

Similar Documents

Publication Publication Date Title
EP0177400B1 (de) Schwimmende Behälterdecke eines Speichertanks insbesondere verwendet in einer Elektronuklearanlage
EP0206874A1 (de) Kunststoffkraftstoffbehälter, insbesondere für Kraftfahrzeuge
EP0415991A1 (de) Automatische füllbegrenzungsvorrichtung für behälter.
EP0084754A1 (de) Rückflussverhinderer für Druckleitungen
FR2788258A1 (fr) Limiteur de remplissage pour cuve de stockage d'un liquide
EP1045814A1 (de) Füllungsbegrenzer für flüssigkeitslagerbehälter
EP0178210B1 (de) Schwimmende Behälterdecke eines Speichertanks insbesondere verwendet in einer Elektronuklearanlage
FR2570683A1 (fr) Perfectionnement aux reservoirs a toit flottant pour liquides, notamment aux reservoirs de stockage utilises dans le domaine electronucleaire
EP0088026B1 (de) Kopf zur Niveaudetektion durch hydrostatischen Effekt mit Schutzvorrichtung
EP0837281B1 (de) Behälter für flüssiges Kohlenwasserstoffgas
EP0001363B1 (de) Verschlussvorrichtung für das Ende einer Tankabfülleitung
WO1993016365A1 (fr) Procede et dispositif pour prelever un echantillon d'eau a une profondeur determinee
FR2524173A1 (fr) Systeme de remplissage d'un reservoir a liquide
BE505784A (de)
EP1578661A1 (de) Anlage zur gewinnung eines in mindestens einem querabschnitt dertanks eines gesunkenen schiffs enthaltenden verunreinigungsfluids
EP0032347B1 (de) Automatische Sprühvorrichtung für den Sicherheitsbehälter eines Druckwasserreaktors
EP0883222B1 (de) Selbstschutz-Auslöseeinrichtung für eingetauchten elektrischen Transformator
EP0341149B1 (de) Kompensationeinrichtung durch Abfluss einer bestimmten Ersatzflüssigkeit und Anwendung zur Wiederbelieferung eines hydraulischen Kreises
FR2639405A1 (fr) Dispositif de prelevement de liquide dans une capacite et en particulier dispositif de puisage de carburant dans le reservoir d'un vehicule automobile
FR2546969A1 (fr) Dispositif de maintien du niveau d'un liquide de lubrification dans le carter d'un moteur a combustion interne
FR2686840A1 (fr) Dispositif d'aeration pour reservoir de carburant.
FR2528996A1 (fr) Detecteur de niveau d'un liquide a flotteur basculant
FR2571342A1 (fr) Dispositif de vidange d'ecran flottant pour reservoir d'hydrocarbure ou autre liquide volatile
FR2612168A1 (fr) Reservoir d'alimentation en liquide pour machine a remplir des recipients
FR2520580A1 (fr) Dispositif pour stocker une masse tres visqueuse, en particulier un fourrage impregne d'un liquide

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE GB IT LI NL SE

17P Request for examination filed

Effective date: 19860602

17Q First examination report despatched

Effective date: 19870116

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870527

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BARBILLAT, CLAUDE