EP0601947B1 - External protecting layer for metallic containers to be buried, in particular for gas containers - Google Patents

External protecting layer for metallic containers to be buried, in particular for gas containers Download PDF

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Publication number
EP0601947B1
EP0601947B1 EP93440097A EP93440097A EP0601947B1 EP 0601947 B1 EP0601947 B1 EP 0601947B1 EP 93440097 A EP93440097 A EP 93440097A EP 93440097 A EP93440097 A EP 93440097A EP 0601947 B1 EP0601947 B1 EP 0601947B1
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EP
European Patent Office
Prior art keywords
layer
synthetic material
thickness
micrometers
mixture
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
Application number
EP93440097A
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German (de)
French (fr)
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EP0601947A1 (en
Inventor
Aimé Benard
Jean Wendling
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Schneider Industrie Si SA
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Schneider Industrie Si SA
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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
    • B65D90/02—Wall construction
    • B65D90/022—Laminated structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/10—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for protection against corrosion, e.g. due to gaseous acid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/12—Vessels not under pressure with provision for protection against corrosion, e.g. due to gaseous acid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0607—Coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0624—Single wall with four or more layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0678—Concrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2109—Moulding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/225—Spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/232—Manufacturing of particular parts or at special locations of walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/05—Improving chemical properties
    • F17C2260/053—Reducing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0142—Applications for fluid transport or storage placed underground
    • F17C2270/0144—Type of cavity
    • F17C2270/0147—Type of cavity by burying vessels

Definitions

  • the invention relates to an external protective coating for a metal tank, intended to be buried, in particular for a gas tank comprising a layer of a mixture of at least one mineral filler, such as sand or the like, and a thermosetting or thermoplastic synthetic material.
  • the present invention will find its application in the field of metal tanks capable of being buried such as gas tanks.
  • a zinc-based anti-corrosion protective layer which can be in the form of a metallization consisting of a projection on said zinc wall. in fusion or of an epoxy-zinc powder applied by electrostatic effect on the tank and polymerized by increasing the temperature. Beyond this anti-corrosion zinc protective layer is applied a layer of epoxy then a final polyester layer.
  • the protection adopted in the case of buried tanks is protection of the cathodic type. More precisely, the tank receives several layers of epoxy, then when it is buried, magnesium anodes are placed on either side of this tank. Note that this cathodic protection is of particular implementation.
  • the major drawback is that the layer of epoxy applied to the external wall is necessarily large, ie of the order of 600 to 700 micrometers thick, in order to obtain sufficient protection. This also represents a significant additional cost insofar as the epoxy resin is an expensive product.
  • an epoxy protective layer is particularly fragile. She is notably sensitive to shocks which, however, are inevitable either during the transport of the tank or at the time of burying it.
  • This above-ground tank comprises, as indicated above, a zinc-based anti-corrosion protective layer on which is applied a layer of epoxy, then a layer of polyester.
  • the solution currently implemented consists in applying to this tank, intended for an aerial arrangement, a new layer of epoxy of substantial thickness, without counting cathodic protection in the form of magnesium anodes which it is advisable to put in place. when burying the tank.
  • the present invention proposes, in particular, to remedy all of the drawbacks encountered in the past in the context of metal tanks, of the gas tank type, intended to be buried and not comprising, as external protective coating, than an application of epoxy resin over a significant thickness.
  • the present invention is intended to solve the problem of the additional cost generated by this application of epoxy resin, but also to the problem of the reduced mechanical strength offered by the latter or to that of the insufficient dielectric protection thus obtained.
  • this reservoir comprises, internally, a metal protective envelope which is checked for leaks. More specifically, on the external side of this internal protective envelope, grains of sand are made to adhere by means of an epoxy-based synthetic resin this in order to maintain said protective envelope spaced from the internal wall. of the tank while allowing the circulation of a gaseous fluid therein. Thus, this preserved space between the wall of the tank and the internal envelope can be put under positive or negative pressure, the variations of which are measured in order to detect a possible leak. Finally, this type of protective coating does not have the function of externally protecting said metal tank.
  • document US-A-4,876,124 discloses a reservoir, the wall of which decomposes into an internal wall, made of a material resistant to corrosion by alcohols and other hydrocarbons, and an external wall of non-hydrolyzable resin. loaded with fiberglass, sand or the like.
  • the invention differs from this state of the art in that it relates to an external protective coating for a metal tank intended to be buried, in particular for a gas tank, comprising a layer of a mixture of at least one mineral filler, such as sand or the like and, of a thermosetting or thermoplastic synthetic material, this coating comprising, in addition, a first layer of synthetic material with a thickness of at least 100 micrometers on which is applied the layer of a mixture of at least one mineral filler and of a synthetic material according to a thickness of at least 300 micrometers, said mixture comprising, by volume, between 60 to 98% of mineral filler.
  • the external protective coating comprises a layer of a thermoplastic material applied to a thickness of at least 500 micrometers on the layer of a mineral filler-synthetic material mixture.
  • the external protective coating is applied to the various layers covering the external wall of a metal tank of the gas tank type provided, initially, for an aerial arrangement with a view to authorizing the placing under earth from this tank.
  • the external protective coating consisting of at least one layer of a mixture of mineral filler and synthetic material and which is applied to the external wall of a tank, has perfect mechanical resistance, especially to shocks, and makes it possible to obtain a good dielectric corresponding to perfect anti-corrosion protection.
  • This dielectric quality obtained through this coating makes it possible, if necessary, to dispense with cathodic protection hitherto implemented, almost systematically, on buried tanks.
  • the majority share of mineral filler makes this coating inexpensive since it leads to a significant saving of synthetic material.
  • the present invention relates, in particular, to metal tanks, of the gas tank type, which are intended to be buried.
  • these tanks must have an external protective coating whose dielectric quality is sufficient to protect them against corrosion for a very long time.
  • Figures 1 and 2 show, very schematically and in section, the casing 1 of such a tank.
  • an external protective coating 2 which, according to the invention, consists of at least one layer 3 of a mixture of at least one mineral filler and of a synthetic material.
  • the thickness of this layer 3 will be chosen at least equal to three hundred micrometers, preferably between 300 and 500 micrometers.
  • the application can be carried out, advantageously, by means of techniques already developed, for example by projection, molding and the like.
  • This mineral filler can also be in the form of a compound of different types of minerals.
  • the synthetic material can be either thermosetting such as epoxy resin, or thermoplastic such as polypropylene.
  • the mineral filler-synthetic material mixture comprises of the order of 60 to 98% of minerals so that the quantity of synthetic material to be used remains particularly low.
  • This layer 3 of a mineral filler-synthetic material mixture can be applied directly to the casing 1 of the gas tank.
  • the external protective coating 2 breaks down into a first layer of synthetic material 5, such as a resin or the like, previously applied to a thickness of at least 100 micrometers on the metal tank.
  • a layer of synthetic material 5 will preferably have a thickness of the order of 100 to 200 micrometers. It is advantageously chosen as the synthetic material intended to compose this layer 5, the same as that involved in the mixture of mineral filler and synthetic material.
  • the external protective coating 2 comprises a layer of a thermoplastic material 9 applied to a thickness of at least 500 micrometers on the layer 3 of a mixture of mineral filler - synthetic material.
  • the thickness of this layer 9 will be between 500 and 700 micrometers.
  • Such a layer 9, which can be described as a finish, being made of thermoplastic material, has excellent qualities in terms of mechanical resistance to shocks. Also, one gains the guarantee that the external protective coating 2, according to the invention, cannot be altered during handling of the metal tank and very particularly at the time of burying it.
  • the mixture of mineral filler and synthetic material can be combined with the thermoplastic material constituting, as defined above, the finishing layer 9.
  • the thermoplastic material constituting, as defined above, the finishing layer 9.
  • FIG. 2 illustrates the case of a tank, such as a gas tank, initially prepared for aerial exposure.
  • a gas tank comprises, at the outer wall of its casing 1, a first layer of an anti-corrosion coating based on zinc 6.
  • it may be a metallization with zinc consisting in spraying the molten zinc onto said envelope 1 or even a coating based on zinc powder and epoxy powder applied by electrostatic effect to the envelope 1, then polymerized by raising the temperature.
  • Such a so-called aerial gas tank receives, beyond this zinc-based anti-corrosion protective coating 6, a layer of epoxy 7 followed by a layer of polyester 8.
  • the external protective coating 2 can also integrate such cathodic protection. This is advantageously in the form of anodes with zinc and not with magnesium, previously welded on the metal reservoir, namely before the application of the different layer (s) 3, 5, 9 which also make up said coating external protection 2.
  • the present invention corresponds to a real technical progress in the field of buried gas tanks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Abstract

For the purpose of improving the quality of the corrosion protection of metal containers (1) intended to be buried, in particular gas tanks, and to avoid them being damaged in the event of impacts while they are being handled and transported, an external protective covering (2) is applied to them, this covering consisting of at least one layer (3) of a mixture of at least one fine filler, such as sand or the like, and of a thermosetting or thermoplastic synthetic material, applied in a thickness of at least three hundred micrometres. <IMAGE>

Description

L'invention concerne un revêtement de protection externe pour réservoir métallique, destiné à être enterré, en particulier, pour citerne à gaz comprenant une couche d'un mélange d'au moins une charge minérale, telle que du sable ou autre, et d'une matière synthétique thermodurcissable ou thermoplastique.The invention relates to an external protective coating for a metal tank, intended to be buried, in particular for a gas tank comprising a layer of a mixture of at least one mineral filler, such as sand or the like, and a thermosetting or thermoplastic synthetic material.

La présente invention trouvera son application dans le domaine des réservoirs métalliques susceptibles d'être enterrés tels que les citernes à gaz.The present invention will find its application in the field of metal tanks capable of being buried such as gas tanks.

Parmi les citernes destinées à contenir du gaz, l'on distingue les citernes dites aériennes en raison de leur disposition hors sol, des citernes enterrées ou semi-enterrées, dans la mesure où la protection externe anti-corrosion diffère souvent dans l'un et l'autre cas.Among the tanks intended to contain gas, one distinguishes the so-called aerial tanks because of their above-ground arrangement, buried or semi-buried tanks, insofar as the external anti-corrosion protection often differs in one and the other case.

Ainsi, dans le cadre des citernes aériennes, il est, habituellement, appliqué sur leur paroi externe, une couche de protection anti-corrosion à base de zinc qui peut se présenter sous forme d'une métallisation consistant en une projection sur ladite paroi de zinc en fusion ou encore d'une poudre époxy-zinc appliquée par effet électrostatique sur la citerne et polymérisée par augmentation de la température. Au-delà de cette couche de protection anti-corrosion en zinc est appliquée une couche d'époxy puis une couche finale polyester.Thus, in the context of aerial tanks, it is usually applied to their external wall, a zinc-based anti-corrosion protective layer which can be in the form of a metallization consisting of a projection on said zinc wall. in fusion or of an epoxy-zinc powder applied by electrostatic effect on the tank and polymerized by increasing the temperature. Beyond this anti-corrosion zinc protective layer is applied a layer of epoxy then a final polyester layer.

La protection adoptée dans le cas des citernes enterrées est une protection du type cathodique. Plus précisément, la citerne reçoit plusieurs couches d'époxy, puis lorsqu'elle est enterrée, des anodes en magnésium sont disposées de part et d'autre de cette citerne. A noter que cette protection cathodique est de mise en oeuvre particulière. En fait, l'inconvénient majeur consiste en ce que la couche d'époxy appliquée sur la paroi externe est nécessairement importante, soit de l'ordre de 600 à 700 micromètres d'épaisseur, afin d'obtenir une protection suffisante. Cela représente, également, un surcoût non négligeable dans la mesure où la résine d'époxy est un produit onéreux. De plus, une couche de protection d'époxy est particulièrement fragile. Elle est notamment sensible aux chocs qui, pourtant, sont inévitables soit lors du transport de la citerne ou au moment de l'enterrer.The protection adopted in the case of buried tanks is protection of the cathodic type. More precisely, the tank receives several layers of epoxy, then when it is buried, magnesium anodes are placed on either side of this tank. Note that this cathodic protection is of particular implementation. In fact, the major drawback is that the layer of epoxy applied to the external wall is necessarily large, ie of the order of 600 to 700 micrometers thick, in order to obtain sufficient protection. This also represents a significant additional cost insofar as the epoxy resin is an expensive product. In addition, an epoxy protective layer is particularly fragile. She is notably sensitive to shocks which, however, are inevitable either during the transport of the tank or at the time of burying it.

Actuellement, se pose, en outre, le problème de l'adaptabilité d'une citerne dans l'un et l'autre cas de figure, soit aérienne et enterrée. Ainsi, l'on peut souhaiter mettre sous terre une citerne initialement prévue pour une disposition aérienne. Cette citerne aérienne comporte, tel qu'indiqué précédemment, une couche de protection anti-corrosion à base de zinc sur laquelle est appliquée une couche d'époxy, puis une couche de polyester. La solution actuellement mise en oeuvre consiste à appliquer sur cette citerne, prévue pour une disposition aérienne, une nouvelle couche d'époxy d'épaisseur conséquente, sans compter la protection cathodique sous forme d'anodes au magnésium qu'il convient de mettre en place au moment d'enterrer la citerne.Currently, there is also the problem of the adaptability of a tank in both cases, either overhead and buried. Thus, one may wish to underground a tank initially intended for an aerial arrangement. This above-ground tank comprises, as indicated above, a zinc-based anti-corrosion protective layer on which is applied a layer of epoxy, then a layer of polyester. The solution currently implemented consists in applying to this tank, intended for an aerial arrangement, a new layer of epoxy of substantial thickness, without counting cathodic protection in the form of magnesium anodes which it is advisable to put in place. when burying the tank.

L'on a déjà envisagé, par le passé, de supprimer la protection cathodique, tout particulièrement, dans le cadre de ce type de citerne aérienne destinée à être modifiée en vue d'une disposition enterrée. A cette fin, l'on a simplement procédé à de nouvelles applications d'époxy en vue d'obtenir une épaisseur encore plus importante. Bien sûr, cela n'a fait qu'augmenter le problème du surcoût que pose l'application d'épaisseurs multiples de résine époxy sur la citerne. Par ailleurs, il subsiste le problème de la tenue mécanique de cette protection époxy renforcée. De plus, elle ne conduit qu'à une protection diélectrique limitée à, environ, 10.000 volts.Consideration has already been given in the past to eliminating cathodic protection, in particular in the context of this type of above-ground tank intended to be modified with a view to a buried arrangement. To this end, new epoxy applications were simply carried out in order to obtain an even greater thickness. Of course, this only increased the problem of the additional cost of applying multiple layers of epoxy resin to the tank. Furthermore, there remains the problem of the mechanical strength of this reinforced epoxy protection. In addition, it only leads to a dielectric protection limited to, approximately, 10,000 volts.

La présente invention se propose, tout particulièrement, de remédier à l'ensemble des inconvénients rencontrés par le passé dans le cadre des réservoirs métalliques, du type citerne à gaz, destinés à être enterrés et ne comportant, en tant que revêtement de protection externe, qu'une application de résine époxy sur une épaisseur importante. Ainsi, la présente invention se veut apte à solutionner le problème du surcoût qu'engendre cette application de résine époxy, mais, également, au problème de la tenue mécanique réduite qu'offre cette dernière ou encore à celui de la protection diélectrique insuffisante ainsi obtenue.The present invention proposes, in particular, to remedy all of the drawbacks encountered in the past in the context of metal tanks, of the gas tank type, intended to be buried and not comprising, as external protective coating, than an application of epoxy resin over a significant thickness. Thus, the present invention is intended to solve the problem of the additional cost generated by this application of epoxy resin, but also to the problem of the reduced mechanical strength offered by the latter or to that of the insufficient dielectric protection thus obtained. .

L'on connaît, par ailleurs, par le document DE-A-1.650.110, un revêtement de protection interne pour réservoir, protégeant celui-ci contre les agressions chimiques et/ou physiques du contenu. Ainsi, ce réservoir comporte, intérieurement, une enveloppe de protection métallique dont on contrôle l'étanchéité. Plus précisément, sur le côté externe de cette enveloppe de protection interne, l'on fait adhérer des grains de sable au moyen d'une résine synthétique à base d'époxyde ceci dans le but de maintenir ladite enveloppe de protection espacée de la paroi interne du réservoir tout en y autorisant la circulation d'un fluide gazeux. Ainsi, cet espace préservé entre la paroi du réservoir et l'enveloppe interne peut être mis sous pression positive ou négative dont on mesure les variations en vue de détecter une éventuelle fuite. Finalement, ce type de revêtement de protection n'a pas pour fonction de protéger, extérieurement, ledit réservoir métallique.We also know from document DE-A-1.650.110, an internal protective coating for a tank, protecting it against chemical and / or physical attack on the contents. Thus, this reservoir comprises, internally, a metal protective envelope which is checked for leaks. More specifically, on the external side of this internal protective envelope, grains of sand are made to adhere by means of an epoxy-based synthetic resin this in order to maintain said protective envelope spaced from the internal wall. of the tank while allowing the circulation of a gaseous fluid therein. Thus, this preserved space between the wall of the tank and the internal envelope can be put under positive or negative pressure, the variations of which are measured in order to detect a possible leak. Finally, this type of protective coating does not have the function of externally protecting said metal tank.

En outre, on connaît par le document US-A-4.876.124 un réservoir dont la paroi se décompose en une paroi interne, conçue en un matériau résistant à la corrosion par les alcools et autres hydrocarbures, et une paroi externe en résine non hydrolysable chargée en fibre de verre, en sable ou analogue.In addition, document US-A-4,876,124 discloses a reservoir, the wall of which decomposes into an internal wall, made of a material resistant to corrosion by alcohols and other hydrocarbons, and an external wall of non-hydrolyzable resin. loaded with fiberglass, sand or the like.

L'invention, telle que définie dans les revendications se distingue de cet état de la technique en ce qu'elle concerne un revêtement de protection externe pour réservoir métallique destiné à être enterré, en particulier pour citerne à gaz, comprenant une couche d'un mélange d'au moins une charge minérale, telle que du sable ou autre et, d'une matière synthétique thermodurcissable ou thermoplastique, ce revêtement comportant, en outre, une première couche de matière synthétique d'épaisseur d'au moins 100 micromètres sur laquelle est appliquée la couche d'un mélange d'au moins une charge minérale et d'une matière synthétique selon une épaisseur d'au moins 300 micromètres, ledit mélange comportant, en volume, entre 60 à 98 % de charge minérale.The invention, as defined in the claims, differs from this state of the art in that it relates to an external protective coating for a metal tank intended to be buried, in particular for a gas tank, comprising a layer of a mixture of at least one mineral filler, such as sand or the like and, of a thermosetting or thermoplastic synthetic material, this coating comprising, in addition, a first layer of synthetic material with a thickness of at least 100 micrometers on which is applied the layer of a mixture of at least one mineral filler and of a synthetic material according to a thickness of at least 300 micrometers, said mixture comprising, by volume, between 60 to 98% of mineral filler.

Selon une autre caractéristique de l'invention, le revêtement de protection externe comporte une couche d'une matière thermoplastique appliquée selon une épaisseur d'au moins 500 micromètres sur la couche d'un mélange charge minérale - matière synthétique.According to another characteristic of the invention, the external protective coating comprises a layer of a thermoplastic material applied to a thickness of at least 500 micrometers on the layer of a mineral filler-synthetic material mixture.

Selon une autre caractéristique de l'invention, le revêtement de protection externe est appliqué sur les différentes couches recouvrant la paroi externe d'un réservoir métallique du type citerne à gaz prévue, initialement, pour une disposition aérienne en vue d'autoriser la mise sous terre de ce réservoir.According to another characteristic of the invention, the external protective coating is applied to the various layers covering the external wall of a metal tank of the gas tank type provided, initially, for an aerial arrangement with a view to authorizing the placing under earth from this tank.

Les avantages obtenus grâce à cette invention consistent, bien entendu, en ce que le revêtement de protection externe, constitué par au moins une couche d'un mélange de charge minérale et matière synthétique et qui est appliqué sur la paroi externe d'un réservoir, présente une parfaite tenue mécanique, notamment aux chocs, et permet d'obtenir un bon diélectrique correspondant à une parfaite protection anti-corrosion. Cette qualité diélectrique obtenue au travers de ce revêtement permet, le cas échéant, de s'affranchir d'une protection cathodique jusqu'alors mise en oeuvre, presque de manière systématique, sur les citernes enterrées. Par ailleurs, la part majoritaire de charge minérale fait que ce revêtement est peu onéreux puisqu'il conduit à une économie non négligeable de matière synthétique.The advantages obtained thanks to this invention consist, of course, in that the external protective coating, consisting of at least one layer of a mixture of mineral filler and synthetic material and which is applied to the external wall of a tank, has perfect mechanical resistance, especially to shocks, and makes it possible to obtain a good dielectric corresponding to perfect anti-corrosion protection. This dielectric quality obtained through this coating makes it possible, if necessary, to dispense with cathodic protection hitherto implemented, almost systematically, on buried tanks. Furthermore, the majority share of mineral filler makes this coating inexpensive since it leads to a significant saving of synthetic material.

La présente invention est décrite plus en détails dans la description qui va suivre se rapportant à des modes de réalisation donnés à titre d'exemple et représentés dans les dessins ci-joints.

  • la figure 1 est une vue très schématisée et en coupe d'un réservoir, du type citerne à gaz, sur lequel est appliqué un revêtement de protection externe conforme à l'invention;
  • la figure 2 est une vue très schématisée et en coupe d'un réservoir, tel qu'une citerne à gaz initialement prévue pour une disposition aérienne et modifiée en vue d'une mise en oeuvre enterrée au travers de l'application du revêtement de protection externe conforme à l'invention.
The present invention is described in more detail in the description which follows, relating to embodiments given by way of example and represented in the attached drawings.
  • Figure 1 is a very schematic sectional view of a tank, of the gas tank type, to which is applied an external protective coating according to the invention;
  • Figure 2 is a very schematic sectional view of a tank, such as a gas tank originally intended for an aerial arrangement and modified for buried implementation through the application of the protective coating external according to the invention.

La présente invention concerne, tout particulièrement, les réservoirs métalliques, du type citernes à gaz, qui sont destinés à être enterrés. Ainsi, ces réservoirs doivent comporter un revêtement de protection externe dont la qualité diélectrique est suffisante afin de les protéger contre la corrosion pendant très longtemps.The present invention relates, in particular, to metal tanks, of the gas tank type, which are intended to be buried. Thus, these tanks must have an external protective coating whose dielectric quality is sufficient to protect them against corrosion for a very long time.

Les figures 1 et 2 représentent, de manière très schématisée et en coupe, l'enveloppe 1 d'un tel réservoir.Figures 1 and 2 show, very schematically and in section, the casing 1 of such a tank.

En fait, sur la paroi externe de cette enveloppe 1 est appliqué un revêtement de protection externe 2 qui, conformément à l'invention, est constitué par au moins une couche 3 d'un mélange d'au moins une charge minérale et d'une matière synthétique. En fait, l'épaisseur de cette couche 3 sera choisie au moins égale à trois cents micromètres de préférence entre 300 et 500 micromètres. L'application peut être effectuée, avantageusement, par l'intermédiaire de techniques déjà élaborées, par exemple par projection, moulage et autre.In fact, on the external wall of this envelope 1 is applied an external protective coating 2 which, according to the invention, consists of at least one layer 3 of a mixture of at least one mineral filler and of a synthetic material. In fact, the thickness of this layer 3 will be chosen at least equal to three hundred micrometers, preferably between 300 and 500 micrometers. The application can be carried out, advantageously, by means of techniques already developed, for example by projection, molding and the like.

Il convient de noter qu'en tant que charge minérale, l'on peut utiliser du sable ou tout autre agrégat de silice qui a l'avantage d'être peu onéreux. Cette charge minérale peut également se présenter sous forme d'un composé de différents types de minéraux.It should be noted that as a mineral filler, it is possible to use sand or any other aggregate of silica which has the advantage of being inexpensive. This mineral filler can also be in the form of a compound of different types of minerals.

Par ailleurs, la matière synthétique peut être, soit thermodurcissable tel que de la résine d'époxy, soit thermoplastique comme le polypropylène.Furthermore, the synthetic material can be either thermosetting such as epoxy resin, or thermoplastic such as polypropylene.

De plus, à ce mélange de charge minérale et de matière synthétique, il peut encore être adjoint un autre composé, tel que du ciment, sans que l'on s'écarte, pour autant de l'esprit de la présente invention.In addition, to this mixture of mineral filler and synthetic material, there may also be added another compound, such as cement, without departing from the spirit of the present invention.

En outre, selon l'invention, le mélange charge minérale-matière synthétique comporte de l'ordre de 60 à 98 % de minéraux de sorte que la quantité de matière synthétique à utiliser reste particulièrement faible.In addition, according to the invention, the mineral filler-synthetic material mixture comprises of the order of 60 to 98% of minerals so that the quantity of synthetic material to be used remains particularly low.

Cette couche 3 d'un mélange charge minérale-matière synthétique peut être appliquée directement sur l'enveloppe 1 de la citerne à gaz. Cependant pour favoriser son accrochage, le revêtement de protection externe 2 se décompose en une première couche de matière synthétique 5, tel qu'une résine ou autre, appliquée préalablement selon une épaisseur d'au moins 100 micromètres sur le réservoir métallique. En fait, une telle couche de matière synthétique 5 aura une épaisseur, préférentiellement, de l'ordre de 100 à 200 micromètres. Il est choisi, avantageusement, en tant que matière synthétique destinée à composer cette couche 5, la même que celle intervenant dans le mélange charge minérale-matière synthétique.This layer 3 of a mineral filler-synthetic material mixture can be applied directly to the casing 1 of the gas tank. However, to promote its attachment, the external protective coating 2 breaks down into a first layer of synthetic material 5, such as a resin or the like, previously applied to a thickness of at least 100 micrometers on the metal tank. In fact, such a layer of synthetic material 5 will preferably have a thickness of the order of 100 to 200 micrometers. It is advantageously chosen as the synthetic material intended to compose this layer 5, the same as that involved in the mixture of mineral filler and synthetic material.

En outre, selon l'invention, le revêtement de protection externe 2 comporte une couche d'une matière thermoplastique 9 appliquée selon une épaisseur d'au moins 500 micromètres sur la couche 3 d'un mélange charge minérale - matière synthétique. Préférentiellement, l'épaisseur de cette couche 9 sera comprise entre 500 et 700 micromètres.In addition, according to the invention, the external protective coating 2 comprises a layer of a thermoplastic material 9 applied to a thickness of at least 500 micrometers on the layer 3 of a mixture of mineral filler - synthetic material. Preferably, the thickness of this layer 9 will be between 500 and 700 micrometers.

Une telle couche 9, que l'on peut qualifier de finition, étant réalisée en matière thermoplastique, présente d'excellentes qualités sur le plan de la résistance mécanique à l'égard des chocs. Aussi, l'on gagne la garantie que le revêtement de protection externe 2, selon l'invention, ne peut être altéré au cours des manipulations du réservoir métallique et tout particulièrement au moment de l'enterrer.Such a layer 9, which can be described as a finish, being made of thermoplastic material, has excellent qualities in terms of mechanical resistance to shocks. Also, one gains the guarantee that the external protective coating 2, according to the invention, cannot be altered during handling of the metal tank and very particularly at the time of burying it.

Selon un autre mode de réalisation, au mélange charge minérale - matière synthétique, que cette dernière soit de nature thermodurcissable ou thermoplastique, peut être combinée la matière thermoplastique constituant, tel que défini ci-dessus, la couche 9 de finition. En fait, il s'agit de combiner les couches 3 et 9 pour n'en faire qu'une seule d'épaisseur minimale de 800 micromètres de préférence comprise entre 800 micromètres et 1,2 millimètres.According to another embodiment, the mixture of mineral filler and synthetic material, whether the latter is of thermosetting or thermoplastic nature, can be combined with the thermoplastic material constituting, as defined above, the finishing layer 9. In fact, it is a question of combining layers 3 and 9 to make only one with a minimum thickness of 800 micrometers, preferably between 800 micrometers and 1.2 millimeters.

La figure 2 illustre le cas d'un réservoir, tel qu'une citerne à gaz, initialement préparé en vue d'une exposition aérienne. Ainsi une telle citerne à gaz comporte, au niveau de la paroi externe de son enveloppe 1, une première couche d'un revêtement anti-corrosion à base de zinc 6. A ce propos, il peut s'agir d'une métallisation au zinc consistant à projeter le zinc en fusion sur ladite enveloppe 1 ou même d'un revêtement à base de poudre de zinc et de poudre d'époxy appliquée par effet électrostatique sur l'enveloppe 1, puis polymérisée par élévation de température.Figure 2 illustrates the case of a tank, such as a gas tank, initially prepared for aerial exposure. Thus such a gas tank comprises, at the outer wall of its casing 1, a first layer of an anti-corrosion coating based on zinc 6. In this regard, it may be a metallization with zinc consisting in spraying the molten zinc onto said envelope 1 or even a coating based on zinc powder and epoxy powder applied by electrostatic effect to the envelope 1, then polymerized by raising the temperature.

Une telle citerne à gaz, dite aérienne, reçoit au-delà de ce revêtement de protection anti-corrosion à base de zinc 6, une couche d'époxy 7 suivie d'une couche de polyester 8.Such a so-called aerial gas tank receives, beyond this zinc-based anti-corrosion protective coating 6, a layer of epoxy 7 followed by a layer of polyester 8.

En vue de permettre la mise sous terre d'une telle citerne destinée à une disposition aérienne, il suffit de lui appliquer un revêtement de protection 2 conforme à l'invention.In order to allow the undergrounding of such a tank intended for an aerial arrangement, it suffices to apply a protective coating 2 to it in accordance with the invention.

En raison des caractéristiques diélectriques élevées d'un tel revêtement de protection 2, il est possible, éventuellement, de s'affranchir de la protection cathodique habituellement mise en place dans le cadre de citernes enterrées.Due to the high dielectric characteristics of such a protective coating 2, it is possible, possibly, to overcome the cathodic protection usually implemented in the context of buried tanks.

Toutefois et selon l'invention, le revêtement de protection externe 2 peut également intégrer une telle protection cathodique. Celle-ci se présente, avantageusement, sous forme d'anodes au zinc et non en magnésium, préalablement soudés sur le réservoir métallique à savoir avant l'application de la ou des différentes couches 3, 5, 9 composant, en outre, ledit revêtement de protection externe 2.However and according to the invention, the external protective coating 2 can also integrate such cathodic protection. This is advantageously in the form of anodes with zinc and not with magnesium, previously welded on the metal reservoir, namely before the application of the different layer (s) 3, 5, 9 which also make up said coating external protection 2.

Dans tous les cas, ce dernier s'avère particulièrement endurant et peu sensible aux chocs d'autant plus que son épaisseur peut être relativement conséquente moyennant une consommation de résine réduite et inférieure à la consommation de résine nécessaire par le passé dans le cadre des citernes enterrées.In all cases, the latter proves to be particularly enduring and not very sensitive to shocks, especially since its thickness can be relatively substantial with a reduced resin consumption and less than the resin consumption required in the past in the context of tanks. buried.

Par conséquent, la présente invention correspond à un réel progrès technique dans le domaine des citernes à gaz enterrées.Consequently, the present invention corresponds to a real technical progress in the field of buried gas tanks.

Claims (8)

  1. External protection coating for metallic containers to be buried, in particular for gas tanks, comprising a layer (3) of a mixture of at least a mineral filler, such as sand or the like, and a thermosetting or thermoplastic synthetic material, characterized in that it includes a first layer of synthetic material (5) with a thickness of at least 100 micrometers on which is applied the layer (3) of a mixture of at least a mineral filler and a synthetic material to a thickness of at least 300 micrometers, said mixture including from 60 to 98% in volume of mineral filler.
  2. External protection coating according to claim 1, characterized in that the synthetic material is epoxy resin.
  3. External protection coating according to any of claims 1 and 2, characterized in that the synthetic material is polypropylene.
  4. External protection coating according to any of claims 1 to 3, characterized in that it includes a layer (9) of thermoplastic material applied to a thickness of at least 500 micrometers on the layer (3) of a mixture of at least a mineral filler and a synthetic material.
  5. External protection coating according to claims 1 and 4, characterized in that with the mixture mineral filler - synthetic material for forming a layer (3) is combined the thermoplastic material capable of defining a layer (9) so that the layers (3) and (9) form one single thickness of at least 800 micrometers.
  6. External protection coating according to claim 1, characterized in that it includes:
    - a first layer (5) of synthetic material with a thickness in the range of 100 to 200 micrometers,
    - a second layer (3) of a mixture of at least a mineral filler and a synthetic material with a thickness in the range of 300 to 500 micrometers,
    - and a last layer of thermoplastic material to a thickness in the range of 500 to 700 micrometers.
  7. External protection coating according to any of the preceding claims, characterized in that it integrates a cathodic protection in the shape of zinc anodes welded onto said metallic container.
  8. External protection coating according to any of the preceding claims, characterized in that it is applied on the various layers covering the external wall of a metallic container, such as a gas tank, initially intended for an overhead arrangement, with a view to authorize the burying of this container.
EP93440097A 1992-12-11 1993-12-07 External protecting layer for metallic containers to be buried, in particular for gas containers Expired - Lifetime EP0601947B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9215133A FR2699258B1 (en) 1992-12-11 1992-12-11 Protective coating for gas tanks intended to be buried.
FR9215133 1992-12-11

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EP0601947A1 EP0601947A1 (en) 1994-06-15
EP0601947B1 true EP0601947B1 (en) 1997-04-16

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EP (1) EP0601947B1 (en)
AT (1) ATE151852T1 (en)
DE (1) DE69309867T2 (en)
ES (1) ES2100507T3 (en)
FR (1) FR2699258B1 (en)

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FR2731264B1 (en) * 1995-03-03 1997-04-30 Schneider Ind S I Sa METALLIC TANK OF THE GAS TANK TYPE, INTENDED TO BE UNDERGROUND
FR2726889B1 (en) * 1994-11-15 1996-12-27 Wendling Christiane Kuhn RESERVOIR, ESPECIALLY GAS TANK
ATE175761T1 (en) * 1994-11-15 1999-01-15 Schneider Ind S I Sa PROTECTIVE COVER FOR METAL CONTAINERS ESPECIALLY FOR GAS CONTAINERS
FR2733489B1 (en) * 1995-04-25 2000-05-19 Galan Inchaurbe Jose Ma Javier IMPROVED TANK / TANK
FR2749060B1 (en) * 1996-05-24 1998-08-14 Butagaz TANK FOR LIQUEFIED OIL GAS
EP0903304B1 (en) * 1997-09-18 2002-07-24 Tankcare B.V. Protection of large above-ground storage tanks against corrosion
EP0905055A1 (en) * 1997-09-18 1999-03-31 Tankcare B.V. Protection of large above-ground storage tanks against corrosion
DE10321602B4 (en) * 2003-05-13 2005-11-10 Luhmann Gmbh Pressure vessel for covered installation
CZ306044B6 (en) * 2010-04-06 2016-07-13 Jan Topol Corrosion protection method of steel tanks and steel tank with such a corrosion protection
ITCO20110011A1 (en) * 2011-03-22 2012-09-23 Nuovo Pignone Spa CONTAINER OF AN ACCUMULATION AND HEAT RELEASE APPARATUS, TOGETHER FOR ACCUMULATION AND RELEASE OF HEAT, AND ENERGY PRODUCTION PLANT
FR2995060B1 (en) * 2012-09-05 2015-03-20 Air Liquide PRESSURIZED FLUID CONTAINER AND METHOD FOR MANUFACTURING THE SAME
CN103604039A (en) * 2013-11-27 2014-02-26 沈阳航天新光集团有限公司 Composite cylinder and external surface protection method thereof
CN106224758B (en) * 2016-07-26 2018-04-27 西北大学 A kind of hybrid spherical storage tank of monoshell multilayer and its manufacturing process
CN115164090A (en) * 2022-07-11 2022-10-11 德新钢管（中国）有限公司 Pressure storage heat storage seamless container

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FR2669397A1 (en) * 1990-11-20 1992-05-22 Benard Aime METALLIC TANK, IN PARTICULAR BOTTLE OR TANK FOR GAS.

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FR2699258A1 (en) 1994-06-17
FR2699258B1 (en) 1995-03-03
DE69309867D1 (en) 1997-05-22
DE69309867T2 (en) 1997-10-02
EP0601947A1 (en) 1994-06-15
ES2100507T3 (en) 1997-06-16
ATE151852T1 (en) 1997-05-15

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