FR2717785A1 - Underground storage tank for liq. prods.. - Google Patents

Underground storage tank for liq. prods.. Download PDF

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Publication number
FR2717785A1
FR2717785A1 FR9403473A FR9403473A FR2717785A1 FR 2717785 A1 FR2717785 A1 FR 2717785A1 FR 9403473 A FR9403473 A FR 9403473A FR 9403473 A FR9403473 A FR 9403473A FR 2717785 A1 FR2717785 A1 FR 2717785A1
Authority
FR
France
Prior art keywords
liquid
tank
wall
leak
space
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.)
Pending
Application number
FR9403473A
Other languages
French (fr)
Inventor
Baret Gilles
Della Faille D Huysse Frederic
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT 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 Alcatel CIT SA filed Critical Alcatel CIT SA
Priority to FR9403473A priority Critical patent/FR2717785A1/en
Publication of FR2717785A1 publication Critical patent/FR2717785A1/en
Pending 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
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/501—Arrangements of indicating or measuring devices of leakage-indicating devices comprising hollow spaces within walls
    • 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
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/51—Arrangements of indicating or measuring devices of leakage-indicating devices characterised by sensors
    • 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
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The tank consists of an inner wall (1) contg. the liq. (4), an outer wall (2) which completely surrounds the inner one, and a tracer gas in the space (3) between the two walls. The tracer gas is one which occurs at a very low level in air, e.g. helium, so that in the event of escape it can be picked up by a detector (18) set in the ground (5) at a distance from the tank. In a variant of the design, using a tank with a single wall, the tracer gas can be dissolved in the stored prod..

Description

Réservoir enterré Dour le stockaae de produits liquides
La présente invention concerne un réservoir enterré pour le stockage de produits liquides permettant la détection facile d'une fuite.Buried tank for the stock of liquid products
The present invention relates to an underground tank for the storage of liquid products allowing the easy detection of a leak.

L'invention s'applique particulièrement, bien que non limitativement, aux cuves enterrées contenant des hydrocarbures. The invention applies particularly, although not limitatively, to buried tanks containing hydrocarbons.

Afin d'éviter, en cas de fuite de la cuve, la pollution du sous-sol, il est connu que de telles cuves comportent une double paroi et l'espace compris entre la paroi interne et la paroi externe est rempli d'un liquide de protection tel que de l'eau avec éventuellement un additif antigel. Cet espace débouche à l'extérieur par un tuyau qui traverse le terrain au-dessus de la cuve, ce qui permet de déceler une baisse de niveau du liquide de protection dans le tuyau et d'en conclure à une fuite de ce liquide vers l'intérieur de la cuve, en cas de défaut d'étanchéité de la paroi interne, ou vers l'extérieur, dans le sol, en cas de défaut d'étanchéité de la paroi externe. In order to avoid, in the event of a leak in the tank, pollution of the basement, it is known that such tanks have a double wall and the space between the internal wall and the external wall is filled with a liquid. protection such as water with possibly an anti-freeze additive. This space opens to the outside by a pipe which crosses the ground above the tank, which makes it possible to detect a drop in the level of the protective liquid in the pipe and to conclude that a leak of this liquid towards the inside the tank, in the event of a leak in the inner wall, or outwards, in the ground, in the event of a leak in the outer wall.

On voit que cette méthode ne permet pas de savoir si la fuite se fait au travers de la paroi interne ou externe. It can be seen that this method does not make it possible to know whether the leak is made through the internal or external wall.

Dans le cas d'une cuve sans double paroi, on se contente de contrôles préventifs fréquents.In the case of a tank without double walls, we are content with frequent preventive controls.

La présente invention propose une disposition nouvelle pour de tels réservoirs permettant une détection facile d'une fuite. The present invention provides a new arrangement for such tanks allowing easy detection of a leak.

L'invention a ainsi pour objet un réservoir enterré pour le stockage de produits liquides, comprenant une paroi interne contenant ledit liquide, et une paroi externe enveloppant entièrement la paroi interne, les deux parois étant séparées par un espace, ledit espace contenant un fluide, caractérisé en ce que ledit fluide est un gaz traceur dont la teneur dans l'air est très faible permettant la détection d'une fuite par reniflage.  The subject of the invention is therefore a buried tank for the storage of liquid products, comprising an internal wall containing said liquid, and an external wall entirely enveloping the internal wall, the two walls being separated by a space, said space containing a fluid, characterized in that said fluid is a tracer gas whose content in the air is very low allowing the detection of a leak by sniffing.

L'invention a aussi pour objet un réservoir enterré pour le stockage de produits liquides, comprenant une paroi interne contenant ledit liquide, et une paroi externe enveloppant entièrement la paroi interne, les deux parois étant séparées par un espace, ledit espace contenant un liquide de protection, caractérisé en ce qu'un gaz traceur dont la teneur dans l'air est très faible est dissous dans ledit liquide de protection, permettant la détection d'une fuite par reniflage. The invention also relates to an underground tank for the storage of liquid products, comprising an internal wall containing said liquid, and an external wall entirely enveloping the internal wall, the two walls being separated by a space, said space containing a liquid of protection, characterized in that a tracer gas whose content in the air is very low is dissolved in said protection liquid, allowing the detection of a leak by sniffing.

L'invention a encore pour objet un réservoir enterré pour le stockage de produits liquides, caractérisé en ce qu'un gaz traceur dont la teneur dans l'air est très faible est dissous dans ledit liquide stocké permettant la détection d'une fuite par reniflage. The invention also relates to an underground tank for the storage of liquid products, characterized in that a tracer gas whose content in the air is very low is dissolved in said stored liquid allowing the detection of a leak by sniffing .

On va maintenant donner la description de quelques exemples de mise en oeuvre de l'invention en se référant au dessin annexé dans lequel
La figure 1 représente un réservoir, selon l'invention à double paroi, enterré.We will now give the description of some examples of implementation of the invention with reference to the accompanying drawing in which
Figure 1 shows a tank, according to the invention with double wall, buried.

La figure 2 représente également un réservoir selon l'invention, à double paroi, enterré. Figure 2 also shows a tank according to the invention, double wall, buried.

La figure 3 représente un réservoir selon l'invention à paroi simple. FIG. 3 represents a tank according to the invention with a single wall.

En se reportant à la figure 1, on voit un réservoir comprenant une paroi interne 1 et une paroi externe 2 enveloppant entièrement la paroi interne. Les deux parois sont séparées par un espace 3. Le réservoir contient par exemple un hydrocarbure 4 situé dans le volume délimité par la paroi interne 1. Referring to Figure 1, there is shown a reservoir comprising an inner wall 1 and an outer wall 2 entirely enveloping the inner wall. The two walls are separated by a space 3. The tank contains for example a hydrocarbon 4 located in the volume delimited by the internal wall 1.

Le réservoir est enterré dans le sol 5 dont la surface est par exemple recouverte d'un revêtement 6. L'espace inter-parois 3 est rempli d'un liquide de protection tel que de l'eau par exemple avec éventuellement un additif antigel. The reservoir is buried in the ground 5, the surface of which is for example covered with a coating 6. The inter-wall space 3 is filled with a protective liquid such as water, for example with possibly an antifreeze additive.

On voit le niveau de ce liquide en 7.We see the level of this liquid in 7.

Conformément à l'invention, de l'hélium a été dissous dans le liquide de protection, par exemple à saturation.  According to the invention, helium has been dissolved in the protective liquid, for example at saturation.

Ainsi, en cas de fuite entre l'espace 3 et le sol 5 à travers la paroi externe 2, l'eau, saturée d'hélium s'écoulera vers le sol 5 et la fuite sera facilement détectée par le moyen d'une sonde 18 d'un détecteur de fuite à hélium 8 que l'on promène à la périphérie du réservoir. Si le revêtement 6 est relativement étanche, tel qu'en béton ou en asphalte, on a alors avantage à percer quelques trous tels que 9, de façon à y introduire la sonde 18. Thus, in the event of a leak between the space 3 and the ground 5 through the external wall 2, the water, saturated with helium, will flow towards the ground 5 and the leak will be easily detected by means of a probe. 18 of a helium leak detector 8 which is walked around the periphery of the tank. If the covering 6 is relatively waterproof, such as in concrete or asphalt, it is then advantageous to drill a few holes such as 9, so as to introduce the probe 18 therein.

Si une fuite a lieu de l'espace interne 3 vers le liquide 4, à travers la paroi interne 1, l'espace 10 audessus du liquide aura une concentration anormale en hélium qui pourra facilement être décelée en plaçant une sonde de reniflage telle que 18 dans la tubulure d'alimentation 11. If a leak takes place from the internal space 3 towards the liquid 4, through the internal wall 1, the space 10 above the liquid will have an abnormal concentration of helium which can easily be detected by placing a sniffing probe such as 18 in the supply pipe 11.

La figure 2 est identique à la figure 1, à ceci près que l'espace interne 3 entre les parois interne 1 et externe 2 n'est pas rempli par de l'eau, mais seulement par un gaz léger tel que de l'hélium. De préférence la pression de l'hélium dans l'espace interne 3 est un peu supérieure à la pression atmosphérique, par exemple à 100m bar. Figure 2 is identical to Figure 1, except that the internal space 3 between the internal walls 1 and external 2 is not filled with water, but only with a light gas such as helium . Preferably the pressure of the helium in the internal space 3 is a little higher than atmospheric pressure, for example at 100 m bar.

De la même façon que dans le cas précédent, mais avec une sensibilité plus grande, on détecte une fuite à travers la paroi externe 2, par un reniflage, effectué sur le sol à la périphérie du réservoir, ou dans des trous, tels que 9,
Si la surface 6 du sol est recouverte d'un revêtement plus ou moins étanche. Si une fuite se produit au travers de la paroi interne 1, on détecte de la même façon que précédemment une telle fuite par reniflage au moyen d'une sonde 12 introduite dans la tubulure d'alimentation 11, et reliée à un détecteur de fuite à hélium 13.In the same way as in the previous case, but with a greater sensitivity, a leak is detected through the external wall 2, by a sniffing, carried out on the ground at the periphery of the tank, or in holes, such as 9 ,
If the surface 6 of the ground is covered with a more or less waterproof coating. If a leak occurs through the internal wall 1, such a leak is detected in the same way as before by sniffing by means of a probe 12 introduced into the supply pipe 11, and connected to a leak detector. helium 13.

Bien entendu, dans le cas de cette figure 2, la paroi externe 2 doit être équipée d'un bouchon de fermeture 14 bien étanche. Of course, in the case of this FIG. 2, the external wall 2 must be equipped with a well-sealed closure cap 14.

Enfin, la figure 3 représente le cas d'un réservoir 15 ne comportant pas de double paroi. Finally, Figure 3 shows the case of a tank 15 having no double wall.

Dans ce cas, on injecte dans le liquide lui-même 4, un hydrocarbure par exemple, le gaz traceur tel que de l'hélium à une concentration de 10% ou à saturation. En cas de fissure du réservoir, un reniflage par sonde 16 reliée à un détecteur 17 permet immédiatement de déceler la fuite. In this case, a tracer gas such as helium at a concentration of 10% or at saturation is injected into the liquid itself 4, for example. In the event of a reservoir crack, sniffing by probe 16 connected to a detector 17 immediately makes it possible to detect the leak.

Un réservoir selon l'invention dans lequel un gaz traceur est introduit, selon le cas, dans l'espace entre deux parois directement sous forme gazeuse ou dissous dans de l'eau, ou bien, dans le cas d'un réservoir à simple paroi, dissous directement dans le liquide emmagasiné, peut être utilisé pour différentes sortes de produits liquides pour lesquels une fuite dans le sol ne peut pas être tolérée. Il ne s'agit pas exclusivement, bien entendu, d'hydrocarbures mais de tout liquide plus ou moins polluant.  A tank according to the invention in which a tracer gas is introduced, as the case may be, into the space between two walls directly in gaseous form or dissolved in water, or alternatively, in the case of a single wall tank , dissolved directly in the stored liquid, can be used for different kinds of liquid products for which a leak in the ground cannot be tolerated. It is not exclusively, of course, hydrocarbons but any more or less polluting liquid.

Claims (4)

REVENDICATIONS 1/ Réservoir enterré pour le stockage de produits liquides, comprenant une paroi interne (1) contenant ledit liquide (4), et une paroi externe (2) enveloppant entièrement la paroi interne, les deux parois (1, 2) étant séparées par un espace (3), ledit espace contenant un fluide, caractérisé en ce que ledit fluide est un gaz traceur dont la teneur dans l'air est très faible permettant la détection d'une fuite par reniflage.1 / buried tank for the storage of liquid products, comprising an internal wall (1) containing said liquid (4), and an external wall (2) completely enveloping the internal wall, the two walls (1, 2) being separated by a space (3), said space containing a fluid, characterized in that said fluid is a tracer gas whose content in air is very low allowing the detection of a leak by sniffing. 2/ Réservoir enterré pour le stockage de produits liquides, comprenant une paroi interne (1) contenant ledit liquide (4), et une paroi externe (2) enveloppant entièrement la paroi interne, les deux parois étant séparées par un espace (3), ledit espace contenant un liquide de protection, caractérisé en ce qu'un gaz traceur dont la teneur dans l'air est très faible est dissous dans ledit liquide de protection, permettant la détection d'une fuite par reniflage.2 / buried tank for the storage of liquid products, comprising an internal wall (1) containing said liquid (4), and an external wall (2) completely enveloping the internal wall, the two walls being separated by a space (3), said space containing a protective liquid, characterized in that a tracer gas whose content in the air is very low is dissolved in said protective liquid, allowing the detection of a leak by sniffing. 3/ Réservoir (5) enterré pour le stockage de produits liquides (4), caractérisé en ce qu'un gaz traceur, dont la teneur dans l'air est très faible est dissous dans ledit liquide stocké, permettant la détection d'une fuite par reniflage.3 / underground tank (5) for the storage of liquid products (4), characterized in that a tracer gas, the content of which in the air is very low, is dissolved in said stored liquid, allowing the detection of a leak by sniffing. 4/ Réservoir selon l'une des revendications 1 à 3, caractérisé en ce que ledit gaz traceur est de l'hélium. 4 / tank according to one of claims 1 to 3, characterized in that said tracer gas is helium.
FR9403473A 1994-03-24 1994-03-24 Underground storage tank for liq. prods.. Pending FR2717785A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9403473A FR2717785A1 (en) 1994-03-24 1994-03-24 Underground storage tank for liq. prods..

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9403473A FR2717785A1 (en) 1994-03-24 1994-03-24 Underground storage tank for liq. prods..

Publications (1)

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FR2717785A1 true FR2717785A1 (en) 1995-09-29

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FR9403473A Pending FR2717785A1 (en) 1994-03-24 1994-03-24 Underground storage tank for liq. prods..

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955661A1 (en) * 2010-01-25 2011-07-29 Mcd Heat exchangers integrity controlling method, involves utilizing dissolved gas as fluid in liquid, measuring possible leak rate, and transforming possible leak rate in terms of risk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709577A (en) * 1983-11-29 1987-12-01 Tracer Research Corporation System for continuously monitoring for leaks in underground storage tanks
US4984450A (en) * 1988-08-23 1991-01-15 Alcatel Cit Method of leak testing a test container with a tracer gas
WO1991002232A1 (en) * 1989-08-11 1991-02-21 Adil Zafer Zaim Leak protected vessel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709577A (en) * 1983-11-29 1987-12-01 Tracer Research Corporation System for continuously monitoring for leaks in underground storage tanks
US4984450A (en) * 1988-08-23 1991-01-15 Alcatel Cit Method of leak testing a test container with a tracer gas
WO1991002232A1 (en) * 1989-08-11 1991-02-21 Adil Zafer Zaim Leak protected vessel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955661A1 (en) * 2010-01-25 2011-07-29 Mcd Heat exchangers integrity controlling method, involves utilizing dissolved gas as fluid in liquid, measuring possible leak rate, and transforming possible leak rate in terms of risk

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