FR2640377A1 - Leaktightness control device for storage tanks - Google Patents
Leaktightness control device for storage tanks Download PDFInfo
- Publication number
- FR2640377A1 FR2640377A1 FR8816315A FR8816315A FR2640377A1 FR 2640377 A1 FR2640377 A1 FR 2640377A1 FR 8816315 A FR8816315 A FR 8816315A FR 8816315 A FR8816315 A FR 8816315A FR 2640377 A1 FR2640377 A1 FR 2640377A1
- Authority
- FR
- France
- Prior art keywords
- container
- test liquid
- tank
- liquid
- pressure
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3245—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a level monitoring device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
La présente invention a pour objet un dispositif de controle d'étanchéité pour réservoirs de stockage, enterrés ou non, plus particulièrement destiné aux réservoirs de fioul, fioul lourd et autres produits de la chimie. The present invention relates to a tightness control device for storage tanks, buried or not, more particularly intended for fuel oil tanks, heavy fuel oil and other chemicals.
Plus précisément, l'invention concerne un dispositif de contrôle d'étanchéité pour réservoirs de stockage présentant un trou d'homme susceptible d'être hermétiquement fermé par des moyens obturateurs, ledit dispositif comprenant, d'une part, une canalisation adaptée à injecter un gaz dans ledit réservoir au travers desdits moyens obturateurs et pour y créer une pression de détection et, d'autre part, un tube plongeur traversant lesdits moyens obturateurs et comportant une partie supérieure de lecture permettant d'observer les variations de la pression de détection dans le réservoir. More specifically, the invention relates to a leaktightness control device for storage tanks having a manhole capable of being hermetically closed by shutter means, said device comprising, on the one hand, a pipe adapted to inject a gas in said reservoir through said obturating means and to create a detection pressure therein and, on the other hand, a dip tube passing through said obturating means and comprising an upper reading part making it possible to observe the variations of the detection pressure in The reservoir.
Un dispositif de ce type, appliqué au contrôle des réservoirs de fioul, est connu d'après le brevet français 2.580.397 qui utilise, comme moyens obturateurs1 un moyeu de roue pourvu d'un pneumatique appliqué contre la paroi interne de la corolle du trou d'homme. Un tube plongeur permet la montée du fioul contenu dans le réservoir lorsque la pression interne de ce dernier est augmentée par injection d'air comprimé. Lorsque le niveau du fioul atteint la partie supérieure de lecture du tube plongeur, on interrompt la montée en pression et le fioul sert alors de liquide test indiquant une stabilité ou non de la pression à l'intérieur du réservoir. Selon que son niveau reste ou non stable1 on en conclut, en effet, à l'étanchéité ou non du réservoir. A device of this type, applied to the control of fuel oil tanks, is known from French patent 2,580,397 which uses, as shutter means1 a wheel hub provided with a tire applied against the internal wall of the corolla of the hole of a man. A dip tube allows the fuel oil contained in the tank to rise when the internal pressure of the latter is increased by injection of compressed air. When the oil level reaches the upper reading part of the dip tube, the pressure build-up is interrupted and the oil then serves as a test liquid indicating whether or not the pressure inside the tank is stable. Depending on whether its level remains stable or not1 we conclude, in fact, whether the tank is sealed or not.
Ce système de contrôle présente de nombreux inconvé nients - il ne peut être mis en oeuvre que si le réservoir contient effectivement du liquide et exclut donc le contrôle des réservoirs vides de tout produit - en cas de fuite, il aggrave, par la mise en pression, les éventuelles pollutions toxiques et nuisibles à l'envi- ronnement ; - il ne peut être mis en oeuvre que si le contenu est suffisamment fluide pour monter dans le tube plongeur : il exclut donc toute possibilité de tester des cuves de fioul lourd - enfin, il ne peut être retenu comme suffisamment sensible que si le liquide arrivant dans la partie de lecture du tube plongeur est peu dense car la perte de pression survenant pour un même abaissement du niveau peut être notablement différente d'un liquide à l'autre (mercure (13,6) et fioul (0,9)). This control system has many drawbacks - it can only be implemented if the reservoir actually contains liquid and therefore excludes the control of empty reservoirs of any product - in the event of a leak, it worsens, by pressurizing , any toxic pollution harmful to the environment; - it can only be used if the content is sufficiently fluid to mount in the dip tube: it therefore excludes any possibility of testing tanks of heavy fuel oil - finally, it can only be considered sufficiently sensitive if the incoming liquid in the reading part of the dip tube is not very dense because the pressure loss occurring for the same lowering of the level can be significantly different from one liquid to another (mercury (13.6) and fuel oil (0.9)) .
La présente invention a pour but de remédier à ces inconvénients et, pour ce faire, elle propose un dispositif de contrôle d'étanchéité du type précité dans lequel la partie inférieure du tube plongeur est réunie de façon étanche, ou détermine, un récipient dont une partie au moins est déformable sous l'effet de la pression, ledit récipient renfermant un liquide peu dense dit "liquide test", le rapport entre le volume de liquide test et la surface de la partie déformable du récipient étant tel qu'à la pression de détection, le niveau du liquide test monte dans ledit tube jusqu'à remplir partiellement sa partie de lecture. The object of the present invention is to remedy these drawbacks and, to do this, it proposes a leak-tightness control device of the aforementioned type in which the lower part of the dip tube is joined in a sealed manner, or determines, a container of which one at least part is deformable under the effect of pressure, said container containing a sparse liquid called "test liquid", the ratio between the volume of test liquid and the surface of the deformable part of the container being such that at pressure detection, the level of the test liquid rises in said tube until partially filling its reading part.
Sous la pression du gaz introduit par la canalisation prévue à cet effet, gaz qui le plus souvent sera de l'air -mais qui pourra, par exemple, être un gaz inerte vis-à-vis des produits oxydables, tel que l'azote-, la partie inférieure du tube plongeur et la partie déformable du récipient vont subir une compression sur toute leur surface externe. Le volume interne défini par le tube et le récipient va alors diminuer en chassant le liquide test vers le haut dans la partie supérieure de lecture. Lorsque le niveau du liquide test atteint la partie de lecture, on cesse la mise en pression du réservoir.Si la pression interne du réservoir reste stable, autrement dit si le niveau du liquide test ne varie pas, le réservoir sera déclaré étanche car si une perforation existait dans la paroi du réservoir, une fuite d'air ou de produit stocké se créerait en provoquant immédiatement une perte de pression et, donc, une descente du liquide test dans la partie de lecture. Under the pressure of the gas introduced through the pipe provided for this purpose, gas which most often will be air - but which may, for example, be an inert gas with respect to oxidizable products, such as nitrogen -, the lower part of the dip tube and the deformable part of the container will undergo compression over their entire outer surface. The internal volume defined by the tube and the container will then decrease by driving the test liquid upwards in the upper reading part. When the level of the test liquid reaches the reading part, the pressurization of the tank is stopped. If the internal pressure of the tank remains stable, in other words if the level of the test liquid does not vary, the tank will be declared leaktight because if a perforation existed in the wall of the tank, an air or stored product leakage would be created immediately causing a loss of pressure and, therefore, a descent of the test liquid in the reading part.
Le liquide test pourra être constitué de fioul, dans le cas de contrôle de réservoir de stockage de fioul, comme il pourra être constitué de tout autre produit de faible densité, comme de l'eau colorée. The test liquid may consist of fuel oil, in the case of checking an oil storage tank, as it may consist of any other low density product, such as colored water.
Le récipient comportant au moins une partie déformable peut être par exemple un récipient dont la paroi présente un pliage accordéon, une zone télescopable ou encore, dans une forme d'exécution préférée de l'invention, un récipient communiquant avec l'intérieur du réservoir et dans lequel est disposée une membrane déformable, le liquide test étant isolé de l'intérieur du réservoir par ladite membrane. The container comprising at least one deformable part may for example be a container whose wall has an accordion fold, a telescopable zone or alternatively, in a preferred embodiment of the invention, a container communicating with the interior of the tank and in which a deformable membrane is arranged, the test liquid being isolated from the interior of the reservoir by said membrane.
Le dispositif selon l'invention peut s'adapter sur les moyens obturateurs décrits dans le brevet français précité, mais également sur tout autre obturateur permettant une parfaite étanchéité du trou d'homme, tel qu'un couvercle avec joint étanche en caoutchouc au travers duquel une perforation avec valve peut permettre l'injection d'air comprimé. The device according to the invention can be adapted to the shutter means described in the aforementioned French patent, but also to any other shutter allowing perfect sealing of the manhole, such as a cover with a waterproof rubber seal through which a perforation with valve can allow the injection of compressed air.
Une forme d'exécution de l'invention est décrite ci-après en référence à la figure unique du dessin annexé où l'on voit la partie supérieure en coupe d'un réservoir 1 présentant un trou d'homme 2 défini par une corolle 3 pourvue d'une bride 4. Le trou d'homme 2 est obturé par des moyens 5 de type quelconqùe prenant appui sur la face interne de la corolle. Ces moyens obturateurs 5 sont traversés de manière étanche par une canalisation 6- et par un tube plongeur 7 comportant une partie supérieure 8 de lecture pourvue d'une graduation 9 et une partie inférieure 10 plongeant dans l'enceinte 11 du réservoir. La partie inférieure 10 du tube 7 présente une zone élargie définissant un réservoir 12 qui s'ouvre en 15 dans l'enceinte 11. An embodiment of the invention is described below with reference to the single figure of the accompanying drawing in which we see the upper sectional view of a tank 1 having a manhole 2 defined by a corolla 3 provided with a flange 4. The manhole 2 is closed by means 5 of any type bearing on the internal face of the corolla. These shutter means 5 are crossed in leaktight fashion by a pipe 6- and by a dip tube 7 comprising an upper reading portion 8 provided with a scale 9 and a lower portion 10 dipping into the enclosure 11 of the tank. The lower part 10 of the tube 7 has an enlarged zone defining a reservoir 12 which opens at 15 in the enclosure 11.
Une membrane 14 est disposée à l'intérieur du réservoir 12, isolant ainsi le volume défini par la partie supérieure du réservoir 12 et le tube 7 qui le surmonte de l'enceinte 11 du réservoir. Ce volume est partiellement empli de liquide coloré 13 qui peut être1 par exemple, du fioul ou de l'eau.A membrane 14 is arranged inside the tank 12, thus isolating the volume defined by the upper part of the tank 12 and the tube 7 which surmounts it from the enclosure 11 of the tank. This volume is partially filled with colored liquid 13 which can be, for example, fuel oil or water.
Au repos, le niveau du liquide 13 se situe, par exemple, en N1. Si l'on injecte de l'air comprimé selon la fleche F, par la canalisation 6, on augmente la pression dans l'enceinte 11. La membrane 14 se déforme en repoussant le liquide 13 dans le tube 7 jusqu'à ce qu'il atteigne la zone graduée B, par exemple en N2. On interrompt alors l'injection d'air comprimé et observe le niveau N2. S'il reste stable, le réservoir 1 est déclaré étanche ; s'il varie, cela traduit l'existence d'une fuite. At rest, the level of the liquid 13 is, for example, at N1. If compressed air is injected according to arrow F, through line 6, the pressure in the enclosure 11 is increased. The membrane 14 is deformed by pushing the liquid 13 back into the tube 7 until it reaches the graduated zone B, for example in N2. The injection of compressed air is then interrupted and the level N2 is observed. If it remains stable, the tank 1 is declared waterproof; if it varies, it indicates the existence of a leak.
Il ressort de la description qui précède que l'opéra- tion ne fait nullement intervenir le liquide stocké dans le réservoir. Celui-ci peut donc être vide ou contenir un liquide très dense. It appears from the foregoing description that the operation in no way involves the liquid stored in the reservoir. It can therefore be empty or contain a very dense liquid.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8816315A FR2640377A1 (en) | 1988-12-12 | 1988-12-12 | Leaktightness control device for storage tanks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8816315A FR2640377A1 (en) | 1988-12-12 | 1988-12-12 | Leaktightness control device for storage tanks |
Publications (1)
Publication Number | Publication Date |
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FR2640377A1 true FR2640377A1 (en) | 1990-06-15 |
Family
ID=9372833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8816315A Pending FR2640377A1 (en) | 1988-12-12 | 1988-12-12 | Leaktightness control device for storage tanks |
Country Status (1)
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FR (1) | FR2640377A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0442595A2 (en) * | 1990-02-16 | 1991-08-21 | Kaneb Metering Corporation | Method for storage tank leak detection having ground water compensation |
WO1997016711A1 (en) * | 1995-11-02 | 1997-05-09 | Karl Kortmann | Sewer construction |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3538746A (en) * | 1968-10-31 | 1970-11-10 | Standard Oil Co | Leak detecting method and apparatus |
DE1798292B1 (en) * | 1968-09-21 | 1972-05-25 | Grundstuecksverwaltungsgesells | Device for testing the tightness of underground storage containers |
FR2580397A1 (en) * | 1985-04-15 | 1986-10-17 | Renvoise Jacques | Volumetric detector of leak out of or into the enclosure of a vessel |
US4732035A (en) * | 1987-02-06 | 1988-03-22 | Pandel Instruments, Inc. | Method and apparatus for storage tank leak detection having temperature compensation |
-
1988
- 1988-12-12 FR FR8816315A patent/FR2640377A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1798292B1 (en) * | 1968-09-21 | 1972-05-25 | Grundstuecksverwaltungsgesells | Device for testing the tightness of underground storage containers |
US3538746A (en) * | 1968-10-31 | 1970-11-10 | Standard Oil Co | Leak detecting method and apparatus |
FR2580397A1 (en) * | 1985-04-15 | 1986-10-17 | Renvoise Jacques | Volumetric detector of leak out of or into the enclosure of a vessel |
US4732035A (en) * | 1987-02-06 | 1988-03-22 | Pandel Instruments, Inc. | Method and apparatus for storage tank leak detection having temperature compensation |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0442595A2 (en) * | 1990-02-16 | 1991-08-21 | Kaneb Metering Corporation | Method for storage tank leak detection having ground water compensation |
EP0442595A3 (en) * | 1990-02-16 | 1992-09-16 | Kaneb Metering Corporation | Method for storage tank leak detection having ground water compensation |
WO1997016711A1 (en) * | 1995-11-02 | 1997-05-09 | Karl Kortmann | Sewer construction |
EA000201B1 (en) * | 1995-11-02 | 1998-12-24 | Карл Кортманн | Sewer construction |
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