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
  • B65D90/503—Arrangements of indicating or measuring devices of leakage-indicating devices comprising hollow spaces within walls under pressure or vacuum
• • 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
  • B65D90/04—Linings
  • B65D90/046—Flexible liners, e.g. loosely positioned in the container

Definitions

• the invention relates to a liquid container with leak monitoring, in particular for storing water-endangering substances, a lining for a liquid container and a method for lining a liquid container.
• liquid container for the storage of water-polluting substances for example, flat-bottom tanks according to DIN 4119 and other storage containers, such as cylindrical storage and steel containers according to DIN 6608-1, are used.
• liquid containers can be equipped with raised floors that form a monitoring room for leak monitoring.
• a vacuum is generated in the monitoring room by a vacuum pump of a leak detector.
• the negative pressure is reduced and an alarm can be triggered by a pressure-dependent control.
• CH 561 143 A5 discloses a fixed tank system for liquids with a base unit consisting of two base plates and an intermediate spacer layer.
• the spacer layer can also be designed in the form of a grid.
• This arrangement requires a complex, non-compliant bottom plate facing the tank interior. Subsequent renovation with such a system is naturally very expensive.
• a storage container for liquid fuels is known from CH 517 148 A5, with a main wall serving to absorb mechanical forces, in particular made of concrete or reinforced concrete, and a sealing coating provided on its side facing the fuel filling, which has several layers of fuel resistant plastic material.
• this inner wall has a profiled, spacing-forming sheet, an intermediate filling made of synthetic resin mortar and an electrically conductive cover layer.
• Such an arrangement is also extremely complex and expensive to manufacture.
• DE 43 05 441 Cl discloses a collecting space for water-polluting liquids with an outer bottom layer made of concrete, a sealant layer in the form of a liquid-sealing metal sheet tray placed on the outer bottom layer and with an inner bottom layer and a circumferential side wall made of concrete, the metal sheet tray is surrounded on all sides by the concrete of the floor layers and the side wall.
• a collecting space is naturally very complex to manufacture, and this solution is also not suitable for retrofitting liquid containers such as flat-bottom tanks.
• a method for producing a double-walled tank from a single-walled tank is known from EP 0 705 771 B1, in which a second inner tank is produced from flat profiles and sheet steel and is arranged at a distance from the existing tank.
• Such methods are very complex and expensive, and there is also the risk that in the event of settlement phenomena, in particular larger tanks, leaks will occur.
• DE 29 807 285 Ul a flat-bottom tank with a leak protection lining is known, in which the leak protection lining consists of a media-resistant plastic film which is fastened by suitable spacers at a short distance from the tank bottom.
• approved lining foils e.g. B.
• the object of the present invention is to provide a lining or cladding of a liquid container which can be checked for leaks, which works reliably and with long-term stability and can be produced with little effort. In particular, it should also withstand high container pressures without failing. Another concern of the invention is to provide a liquid container with leak monitoring and a method for leak monitoring of a liquid container.
• the invention solves this problem by a lining or cladding according to claim 1, a liquid container according to claim 5 or a method according to claim 7, preferably in conjunction with one or more of the features of the respective subclaims.
• the core of the invention is the use of a lining of a liquid container with a mesh-like spacer layer made of individual threads arranged crosswise to one another in connection with a cushion layer made of foam.
• the spacer layer serves to ensure a fluid-permeable intermediate space or an intermediate layer between the actual Chen sealing and the container bottom or the container wall and thus to check the tightness of both the seal consisting of foils and the container bottom or wall.
• the use of the foam padding layer between the film seal and the spacer layer prevents the film from being pressed into the intermediate spaces of the spacer layer under high pressure and long-term stress and can thereby be destroyed in the short or long term.
• the lining according to the invention can be used in particular for lining the tank bottom, possibly also the inner walls of the tank, but it can also be used for the outer lining of a liquid container in order to ensure a reliable separation between the escaping dangerous goods and e.g. B. to reach rainwater.
• the term lining is used in this application, it also encompasses an outer lining of a liquid container, for example a tank.
• the net-like spacer layer consists of two levels of individual threads arranged crosswise to one another, the individual threads basically being able to have the same thread thickness of in particular 1 to 5 mm.
• the individual levels of individual threads are preferably formed from individual threads of different thicknesses.
• the plane facing the cushion layer consists of threads with a diameter of between approximately 1 and 2 mm, the individual threads having a pitch of 2. 5 to 5 mm are arranged.
• the free space between two threads is preferably 0.5 to 4 mm, in particular 1 to 2.5 mm.
• the individual threads have a thickness of approximately 1.5 to 3.5 mm, in particular 2 to 3 mm, with a pitch of 4 to 8 mm, in particular 5 to 7 mm.
• the individual threads of this level thus preferably have a greater thickness and a greater distance from one another than the threads of the level of the spacer layer adjacent to the foam.
• the individual threads in each of the two planes run approximately parallel to one another, while the threads of one plane run at an angle of 40 to 90 ° to the threads of the other plane.
• the angle can deviate from 90 °, in particular for manufacturing reasons.
• the threads of the mesh-like spacer layer preferably consist of thermoplastic, in particular of polyolefins.
• Polypropylene and in particular PE-HD are particularly preferred, the low tendency to creep under stress ensures sufficient long-term stability.
• PE-HD has the most favorable compromise between good manageability (flexibility) and low tendency to creep. Under certain circumstances, it may also be useful to crosslink the threads.
• the individual threads of the two levels arranged crosswise to one another are preferably connected to one another, in particular welded to one another, in order to ensure better handling and to prevent the threads from shifting relative to one another. In principle, they can also be woven together.
• a crosslinked polyolefin foam with a bulk density between 120 and 350 kg / m 3 is preferably used as the cushion layer for the lining according to the invention.
• Crosslinked polyolefin materials for example commercially available under the Trocellen ® brand, have excellent long-term behavior under pressure with little tendency to creep, so that with the appropriate selection of the mesh-like spacer layer, reliable lining is guaranteed even with high pressure loads on the lining due to a high liquid column is.
• the bulk density is particularly preferably between 180 and 250 kg / m 3 , since in this area, on the one hand, a sufficient stability lity of the cushion layer is guaranteed and on the other hand, a satisfactory protection of the actual seal arranged above the cushion layer is guaranteed.
• the preferred thickness of the cushion layer is between 3 and 5 mm, with larger thicknesses resulting in only a small additional protective effect.
• the actual liquid-tight film seal is - as is generally known to the average person skilled in the art.
• the Mipoplast ® R 9625/6 heating oil tank film from Sika-Trocal GmbH can be used.
• the lining according to the invention can optionally be applied in the individual layers one after the other in or on the tank, that is to say first the mesh-like spacer layer composed of individual threads arranged crosswise to one another, then the cushion layer made of foam and finally the liquid-tight film seal.
• the spacer layer and the cushion layer or of all three layers connected to one another it is preferred to use a composite sheet consisting of the spacer layer and the cushion layer or of all three layers connected to one another.
• the foil seal consists of individual sealing sheets that are welded together to overlap.
• the fluid-tight seal with respect to the container bottom or the container wall is carried out in a manner known to the average person skilled in the art, in particular by means of clamping rails, gluing or the like Wall or the bottom of the tank. In the event of a leak in the liquid container, this negative pressure is reduced and an alarm can be triggered with a pressure-dependent control.
• the lining according to the invention is suitable for tanks and other containers with large filling levels, e.g. B. up to about 20 to 25, and any diameters. Possibly. If the diameter of the liquid container is large, the interstitial space can be suitably divided so that individual segments can be refurbished in the event of a leak.
• media of hazard classes AI, All, AIII and B can be stored as storage materials in accordance with Section 3 of the VbF.
• An important advantage of the system according to the invention over conventional solutions is the flexibility of the overall structure. So existing bumps in the substrate, e.g. B. the steel floor, are bridged. There are no additional tensions and forces that affect the existing steel structure and could cause damage.
• FIG. 1 shows a cross section through a tank bottom lined according to the invention.
• FIG. 2 shows a perspective view of the lining according to the invention in the view from the tank bottom.
• web-shaped elements made of cross-linked polyolefin foam with a bulk density of 220 kg / m 3 (trade name Trocellen ® , type 22004N, manufacturer HT TROPLAST AG,) and a thickness of 4 mm with a mesh or lattice-like fabrics made of PE-HD threads thermally laminated.
• the net-like fabric consists of two individual threads 6, 6 'connected to one another at the crossing points and running in two planes. In each plane, the threads run parallel to one another and with respect to the threads 6, 6 'of the other plane at an angle of approximately 70 ° to one another.
• the layer facing the foam consists of individual threads 6 with 1.5 mm diameter (D in Fig. 2) and a pitch A of 3.7 mm, that is, with a clear grid width of 2.2 mm.
• the level facing the tank bottom consists of individual threads 6 'with a thickness C of 2.5 mm diameter and a pitch B of 6 mm, that is to say a clear distance of 3.5 mm from one another.
• the bottom 2 of the oil tank is initially laid out with these web-like two-layer elements.
• the individual sheet-like elements are laid in a butt joint.
• the longitudinal edges between two adjoining elements are then fixed to each other by welding foam strips made of the same material as the cushion layer to one another, thereby concealing the abutting edges and protecting the sealing film that will later be overlying them.
• FIG. 1 The connection of the system to the tank wall is explained in more detail in FIG. 1.
• a sheet metal strip 7 is welded on at a height of approximately 80 cm above the tank bottom 2 with a sharp waving.
• the edge of the sealing film 4 is attached to this sheet metal strip 7 by gluing.
• the bead is then cast with a media-resistant casting compound 3.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Examining Or Testing Airtightness (AREA)
• Laminated Bodies (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7658954

Family Applications (1)

Country Status (7)

Citations (7)

Family Cites Families (2)

• 2000
  • 2000-10-05 DE DE10049640A patent/DE10049640A1/de not_active Withdrawn
• 2001
  • 2001-10-04 DE DE50106410T patent/DE50106410D1/de not_active Expired - Lifetime
  • 2001-10-04 AT AT01986292T patent/ATE296774T1/de not_active IP Right Cessation
  • 2001-10-04 AU AU2002223014A patent/AU2002223014A1/en not_active Abandoned
  • 2001-10-04 PL PL36115401A patent/PL361154A1/xx not_active IP Right Cessation
  • 2001-10-04 CZ CZ2003969A patent/CZ2003969A3/cs unknown
  • 2001-10-04 WO PCT/DE2001/003821 patent/WO2002028749A1/de not_active Ceased
  • 2001-10-04 EP EP01986292A patent/EP1339624B1/de not_active Expired - Lifetime
  • 2001-10-04 DE DE10194193T patent/DE10194193D2/de not_active Expired - Fee Related

Patent Citations (7)

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