Classifications

• • 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
  • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
  • F17C1/04—Protecting sheathings
• • 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
  • F17C1/007—Underground or underwater storage
• • 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
  • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
  • F17C2201/01—Shape
  • F17C2201/0104—Shape cylindrical
  • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
• • 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
  • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
  • F17C2201/03—Orientation
  • F17C2201/035—Orientation with substantially horizontal main axis
• • 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
  • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
  • F17C2201/05—Size
  • F17C2201/054—Size medium (>1 m3)
• • 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
  • F17C2203/0619—Single wall with two 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
  • F17C2203/0602—Wall structures; Special features thereof
  • F17C2203/0612—Wall structures
  • F17C2203/0614—Single wall
  • F17C2203/0621—Single wall with three 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
  • F17C2203/0678—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
  • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
  • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
  • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
  • F17C2205/0379—Manholes or access openings for human beings
• • 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
  • F17C2209/22—Assembling processes
  • F17C2209/227—Assembling processes by adhesive means
• • 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
  • F17C2221/00—Handled fluid, in particular type of fluid
  • F17C2221/03—Mixtures
  • F17C2221/032—Hydrocarbons
  • F17C2221/035—Propane butane, e.g. LPG, GPL
• • 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
  • F17C2223/0146—Two-phase
  • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
• • 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
  • F17C2223/033—Small pressure, e.g. for liquefied gas
• • 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 present invention relates to a cistern for storing liquefied petroleum gas, and more in particular to a pressurized cistern of the type not subject to a flame which is designed to hold liquefied petroleum gas and to be buried in the ground with an attached cathodic protection system including at least one sacrificial anode, comprising an airtight tank made of sheet steel having an inner surface making up the chamber where the liquefied petroleum gas is stored, and having an outer surface; and a layer of passive anticorrosion sheathing, that covers the entire outer surface of the tank.
• the cistern designed to hold liquefied petroleum gas and to be buried in the ground with an attached cathodic protection system including at least one sacrificial anode comprises an airtight tank made of sheet steel having an inner surface making up a chamber where the liquefied petroleum gas is stored, and having an outer surface; and a layer of passive anticorrosion sheathing that covers the entire outer surface of the tank, characterized in that it has an extra layer of hydraulic mortar sheathing which covers the entire anticorrosion sheathing and designed to come in direct contact with the natural soil in the ground.
• the present invention involves a conventional cistern with the only difference being that it has an extra layer of hydraulic mortar sheathing that covers the cistern's anticorrosion sheathing. This hydraulic mortar sheathing comes in direct contact with the natural soil in the ground around the cistern.
• the extra layer of hydraulic mortar sheathing is hard enough to protect the cistern's anticorrosion sheathing, made of a passive organic material chosen from a group containing epoxide paint, from dents and nicks caused by falling rocks and other things contained in natural soil in the ground when covering the cistern or caused by the slow movement of the ground when stabilizing the cistern.
• the hydraulic mortar sheathing is also sufficiently supple to absorb these impacts without transferring the percussion energy to the cistern's anticorrosion sheathing.
• the hydraulic mortar sheathing does not hinder the functioning of the cathodic protection system since it conducts electricity.
• its electrochemical behaviour is similar to that of the sand provided that the hydraulic mortar sheathing is in homogeneous and constant contact with the cistern's anticorrosion sheathing which, in turn, is in homogeneous and constant contact with the tank itself. It does not add an electrical insulation barrier to that provided by the organic anticorrosion sheathing the resistance of which is controlled. This means that the cathodic protection currents are sufficient and therefore easily measurable on site and directly comparable to the measurable values for sand.
• the hydraulic mortar prevents the occlusion of air that may occur with other types of additional insulating sheathing layers.
• the hydraulic mortar sheathing does not have any effect on the cistern's ability to evaporate liquefied petroleum gas because of its favourable heat exchange coefficients.
• the hydraulic mortar sheathing that makes up the additional layer may be reinforced. It is possible to use any of the known materials used for reinforcement. Fibrous material, for instance, can be mixed with the hydraulic mortar when the cistern is manufactured, more specifically when the extra layer of sheathing is added by spraying the hydraulic mortar, for example, onto the cistern's anticorrosion sheathing. However, it is also possible, even preferable, for the tank itself act as the frame for the hydraulic mortar sheathing by bonding the hydraulic mortar sheathing to the anticorrosion sheathing at all points. This can be done by adding a thin intermediate layer of an adhesive substance between the hydraulic mortar sheathing and the anticorrosion sheathing in such a way that the layers are bonded together at all points.
• the adhesive substance used may be any of a number of resin compositions, such as epoxides, acrylics, styrene-butadiene.
• the adhesive substance is sprayed in liquid form onto the anticorrosion sheathing layer and later harden.
• Fresh hydraulic mortar is then added onto the adhesive substance while it is still sticky and viscous and when it hardens, the hydraulic mortar sheathing will be securely bonded at all points to the anticorrosion layer. It is possible to obtain the same bonding effect without such an intermediate adhesive layer. This is due to the fact that the anticorrosion sheathing layer itself is sprayed in liquid form onto the tank and later hardens .
• the present invention offers the revised procedure to be followed for installing a pressurized cistern of the type not subject to a flame that is designed to hold liquefied petroleum gas, and to be buried in the ground, comprising: an airtight tank made of sheet steel having an inner surface making up the chamber where the liquefied petroleum gas is stored, and having an outer surface; and a layer of passive anticorrosion sheathing, that electrically insulates and covers the entire outer surface of the tank. At least one sacrificial anode, buried in the ground is electrically connected to the tank with such connection passing through the hydraulic mortar sheathing as well as the intermediate adhesive layer, if used. The cistern is then buried with the outside hydraulic mortar sheathing coming into direct contact with the natural soil in the ground.
• the manner in which the installation is carried out is original with respect to traditional cistern installations and the present invention also offers a buried installation of liquefied petroleum gas storage making use of a pressurized cistern of the type not subject to a flame that is designed to hold liquefied petroleum gas, and to be buried in the ground, comprising: an airtight tank made of sheet steel having an inner surface making up the chamber where the liquefied petroleum gas is stored, and having an outer surface; and a layer of passive anticorrosion sheathing, that covers the entire outer surface of the tank, and electrical wires to connect the tank to at least one sacrificial anode that is also buried and placed directly in contact with the natural soil in the ground, which electrical wires pass through the anticorrosion layer.
• the cistern according to the invention has a layer of hydraulic mortar sheathing through which the electrical wires also pass and this hydraulic mortar sheathing forms the outer surface of the cistern is in direct contact with the natural soil in the ground.
• Figure 1 shows a frontal cut view of a pressurized liquefied petroleum cistern that was buried according to the traditional method
• Figure 2 shows a frontal cut view of a pressurized liquefied petroleum cistern that was buried using the present invention. In both Figures, certain dimensions have been exaggerated so as to better illustrate the various components .
• Figure 1 showing the traditional concept of a buried cistern 1, designed to hold a variable amount of liquefied petroleum gas 2 with a space for evaporated petroleum gas 3 which is obtained by the natural vaporization of the liquid product for which the very high pressure to which the gas is subjected with respect to the outside air pressure is equal to the pressure of the saturating vapour of the petroleum gas and for which the value depends on the temperature of the upper layer of the liquid product.
• an airtight tank 4 made of sheet steel which provides the mechanical resistance for the cistern 1 with respect to the very high pressure to which the gas is subjected with respect to the outside air pressure. It generally has a tubular side wall 5 having an inner surface and an outer surface which run cylindrically around a generally horizontal axis 6 (which extends perpendicular to the plane of drawing) . It has furthermore partially spherical end walls 7 having an inner surface and an outer surface, which surfaces run hemispherically around the horizontal axis 6 and are concave to one another along this axis.
• the inner surfaces of the walls 5 and 7 form an surface 8 which makes up the inner chamber 29 where the liquefied petroleum gas 2 is kept with the evaporated petroleum gas 3.
• the outer surfaces of the walls 5 and 7 form the outer surface 9 of the tank 4 which, in turn, is entirely covered by a complete layer of passive anticorrosion sheathing 10.
• This anticorrosion sheathing 10 acts as electrical insulation for the tank 4 and is made of a passive organic material chosen from a group containing epoxide paint.
• the anticorrosion sheathing 10 has an inner surface 11 which is in direct and continuous contact with the outer surface 9 of the tank 4 , both at the tubular side wall 5 level and at the end walls 7 level.
• the anticorrosion sheathing 10 also has an outer surface 12 which in the case of the traditional cistern 1, also constitutes the outer layer of the cistern 1.
• the cistern 1 is suspended or wedged in the pit 14 so that it does not touch the natural soil 13.
• Two sacrificial anodes 15 are then buried in the natural soil 13 to either side of the cistern 1 within the pit 14. These sacrificial anodes 15 are placed at approximately the same level as and parallel to the horizontal axis 6.
• the inner chamber 29 of the tank 4 is connected to user devices by means of a system of conduits and valves housed in an inspection hole 18 made up of a large airtight tube 19 which is attached to the tank 4 in an airtight manner by means of the anticorrosion sheathing 10.
• This inspection hole 18 runs around a vertical axis 20 which is perpendicular to the horizontal axis 6.
• the inspection hole has a removable lid 21 that is situated above the level of the sand 17.
• This extra layer of hydraulic mortar sheathing 23 forms a new inner surface 24 which completely covers the outer surface 12 of the anticorrosion sheathing 10.
• a new outer surface 25 is formed and this now constitutes the outer layer of the cistern 22.
• the inner surface 24 of the hydraulic mortar sheathing 23, obtained by projection of hydraulic mortar, for example, is uniformly distributed and closely bonded at all points along the outer surface 12 of the anti ⁇ corrosion sheathing 10. This is done by using one of two methods.
• the first of the two methods entails the direct application of hydraulic mortar onto the anticorrosion sheathing 10 shortly after this anticorrosion sheathing 10 has been sprayed in liquid form onto the outer surface 9 of the tank 4. Because the anticorrosion sheathing 10 is still sticky and viscous when the hydraulic mortar sheathing 23 is added, both sheathings 10 and 23 will be securely bonded at all points when the anticorrosion sheathing 10 dries and hardens.
• the second method involves the adding a thin intermediate layer of an adhesive substance 26 between the hydraulic mortar sheathing 23 and the outer surface 12 of the anticorrosion sheathing 10 in such a way that the two sheathings 10 and 23 are bonded together at all points.
• the adhesive substance 26 used may be any of a number of resin compositions, such as epoxides, acrylics, styrene- butadiene, without being an exhaustive list, that are sprayed in liquid form onto the outer surface 12 of the anticorrosion sheathing 10.
• Fresh hydraulic mortar that is, containing mixing water, is then added onto the intermediate layer of the adhesive substance 26 while it is still sticky and viscous and when it hardens, the hydraulic mortar sheathing 23 will be securely uonded at all points to the outer surface 12 of the anticorrosion sheathing 10.
• each of the two methods provides a sufficiently efficient bonding of the hydraulic mortar sheathing 23 to the anticorrosion sheathing 10 which, itself, is sufficiently bonded to the tank 4, to provide a strong enough assembly which does not require any support frames.
• the mechanical properties described for the cistern 22, being used to hold liquefied petroleum gas 2 and evaporated gas 3 under very high pressure with respect to outside air pressure, are sufficient for this purpose.
• additional reinforcement be added to the hydraulic mortar sheathing 23, for instance, in the form of fibrous material mixed with the hydraulic mortar before it is applied to the anticorrosion sheathing 10.
• the hydraulic mortar sheathing 23 should be applied uniformly and over the entire anticorrosion sheathing 10. Tests have demonstrated that a uniform thickness no greater than 20 mm provides the anti ⁇ corrosion sheathing 10 with the same protection offered by the sand layer 17 used in the traditional method shown in Figure 1 to mechanically insulate the cistern 1 from - li ⁇ the natural soil 13.
• the cistern 22 may be buried in the manner described below.
• a pit 27 is dug in the natural soil 13 in the ground in exactly the same manner as the pit 14 in Figure 1, that is, having the same dimensions and large enough to receive the cistern 22.
• the cistern 22 When manufactured, the cistern 22 is coated with its hydraulic mortar sheathing 23 and is placed in the pit 27 in such a way that the inspection hole 18 is turned towards the top and aligned with the vertical axis 20.
• two sacrificial anodes 15 are buried into the natural soil 13 at the level of the horizontal axis 6.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Prevention Of Electric Corrosion (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9492438

Family Applications (1)

Country Status (7)

Families Citing this family (7)

Family Cites Families (4)

• 1996
  • 1996-05-24 FR FR9606490A patent/FR2749060B1/fr not_active Expired - Lifetime
• 1997
  • 1997-05-22 AR ARP970102180A patent/AR007255A1/es unknown
  • 1997-05-23 EP EP97927064A patent/EP0909368A1/en not_active Ceased
  • 1997-05-23 WO PCT/EP1997/002773 patent/WO1997045672A1/en not_active Ceased
  • 1997-05-23 PL PL97330078A patent/PL183376B1/pl not_active IP Right Cessation
  • 1997-05-23 TR TR1998/02422T patent/TR199802422T2/xx unknown
• 1998
  • 1998-11-23 NO NO985449A patent/NO985449L/no unknown

Non-Patent Citations (1)

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