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
• • 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
  • B65D90/505—Arrangements of indicating or measuring devices of leakage-indicating devices comprising porous spaces or porous layers in walls
  • B65D90/507—Arrangements of indicating or measuring devices of leakage-indicating devices comprising porous spaces or porous layers in walls under pressure or vacuum

Definitions

• the invention relates to a connection system for fastening a flexible plastic film for leak protection lining on the inside of the tank wall of a tank for storing water-polluting media.
• Flat-bottom tanks are made of steel or reinforced concrete and are mainly used for storing fuels, mineral oils, acids, alkalis, solvents or the like.
• both single-walled and double-walled flat-bottom tanks are used.
• single-walled storage tanks must be retrofitted with an additional leak protection lining.
• a so-called second wall or inner wall is formed by a leak protection lining and the single-walled storage tank is thereby converted into a double-walled storage tank.
• the leak protection lining covers at least the tank bottom and can extend to the tank fill opening according to the given requirements or can be attached to the inside of the outer wall of the tank at a certain height.
• Two different systems are known as leak protection lining based on plastics.
• One relates to a lining with a fixed inner wall and the other to a lining with a flexible film.
• a laminate of a knobbed film e.g. B. made of aluminum
• a plastic layer preferably based on epoxy resin, which contains a single or multi-layer glass fiber fabric as reinforcement, used (EP 0 470 321 B1, DE 36 22 593 C2 and US Pat. No. 5,269,436).
• the glass fiber fabric and the plastic layer consisting of a reaction resin are either firmly connected to the knobbed film or to the tank wall and form a solid, stable wall after curing.
• the knobbed film is used exclusively to form the required leakage monitoring area and can also be replaced by a grille or another cavity-forming insert.
• the attachment of this lining to the inside of the tank wall is relatively unproblematic. If the knobbed film extends into the wall area, it will be made of synthetic resin and the existing glass fiber reinforcement pulled up to the tank wall and connected to it. However, such inner linings are very expensive to manufacture and assemble.
• the other system consists of a pressure-stable cavity-forming insert and at least one media-resistant flexible plastic film lying on this insert, e.g. B. made of PVC, which lies loosely on the tank wall or the cavity-forming insert and is attached to the tank wall.
• a pressure-stable cavity-forming insert e.g. B. made of PVC
• PVC media-resistant flexible plastic film
• connection points have to be media and vacuum tight.
• connection points have to be media and vacuum tight.
• steel storage tanks in particular, it must also be taken into account that they are outdoors and are exposed to considerable temperature fluctuations. Additionally changing fluid levels in the containers also affect the expansion behavior of the container material.
• a flat-bottom tank is known from DE 298 07 285 U1, in which the flexible lining film is attached all round by means of a clamping device.
• the clamping device consists of bolts which are arranged at the same height and which are fixed in or on the tank wall at defined intervals and project inwards onto which the clamping rails can be attached.
• Elastic sealing tapes are arranged all around between the clamping rails and the film, as well as the film and the inside of the tank wall. The clamping rails are locked under pressure on the bolts.
• a leak protection lining (DE 299 18 485 U1) with a connection system for fastening a flexible plastic film to the inside of the tank wall of a storage tank is also known, the leak protection lining consisting at least of a cavity-forming insert and a media-resistant flexible lining film made of plastic lying thereon.
• the connection system consists of a mounting bracket which is fixed by gluing to fix the position by means of a flexible, all-round plastic bracket on the inside of the tank wall and the upper part of the leg of the mounting bracket.
• the lining film is connected in an overlapping manner by gluing or welding to the leg of the fastening bracket running parallel to the tank bottom.
• the invention has for its object to provide a connection system for attaching a flexible plastic film for leak protection lining on the inside of the outer wall of a storage tank, which requires little assembly effort and ensures permanent and reliable tightness.
• the proposed connection system consists at least of a strip-shaped sealing membrane and an adapter film.
• the sealing membrane represents the actual carrier material and has an upper fastening section which is fastened all round on the inside of the tank wall by means of an adhesive based on plastic, and a lower fastening section which overlaps the adapter film and is connected to it by gluing or welding.
• the lower end section of the adapter film is connected to the lining film by welding.
• the dimensions of the lining film and the adapter film are matched to one another in such a way that the weld seam is located in the area of the floor.
• the height of the attachment points on the tank wall, their Distance from the tank bottom depends on the specified lining conditions.
• the adapter film can be connected to the lower section of the sealing membrane either by welding or gluing. However, a welded connection is only possible if this section consists of a weldable plastic. If the connection between the adapter film and the sealing membrane is made by gluing, the adapter film can also be glued to the tank wall in the area of its upper edge. This variant is used when there are particularly high demands on the tightness of the connection point.
• the strip-shaped sealing membrane can be formed in various ways, e.g. B. from an impregnable synthetic fiber mat or a glass fabric mat, which is placed on the prepared adhesive layers and pressed.
• a reaction resin based on epoxy or polyester resin is used as the adhesive, which is then finally applied to the top of the fabric or mat in order to achieve a high level of tightness at the connection points.
• the adapter film should be perforated in the area of the joint so that the resin can penetrate the adapter film and an improved adhesion of the film is achieved. After the resin has hardened, a stable strip-shaped sealing membrane is created, which is permanently and firmly connected to the tank wall and the adapter film.
• a sealing membrane made of a polymeric or elastomeric material that has more elastic properties than the aforementioned composites. It is also possible to manufacture the actual lining film, the adapter film and the sealing membrane from the same material. However, the waterproofing membrane should be at least twice as thick as the lining film. It can also consist of a prefabricated composite material, such as a glass fiber reinforced film. The adapter film can also be reinforced, at least in the fastening area. eg by another laminated film strip or a reinforcement insert.
• the adapter film can additionally be equipped in the fastening area between the tank wall and the sealing film on one or both sides with two horizontally circumferential strips, consisting of a textile fabric made of plastic fibers.
• the flat structure can be a fleece or a mat, which is connected to the adapter film by lamination or gluing.
• the textile fabric can also first on the adhesive layer applied to the tank wall put on and pressed on. Polypropylene or polyester are preferably used as plastic fibers.
• an intermediate space is arranged between the two strips, at least on the outside of the adapter film, which forms a diffusion barrier.
• the vertical distance between the two strips to form the diffusion barrier should be a few millimeters, preferably 3 mm.
• the adhesive to be used and the choice of material for the adapter film and the sealing membrane must be coordinated with one another, taking into account the medium to be stored in the tank, the nature of the wall of the tank to be lined, and the expected stresses on the tank wall due to influences from temperature and / or level fluctuations.
• the tanks are usually made of either steel or concrete.
• adhesives should be used which have good adhesion and cohesion.
• Suitable adhesives are e.g. B. polyurethane adhesives, epoxy and polyester resins, anaerobic curing adhesives and adhesives based on MS polymers.
• Polyurethane adhesives are suitable for almost all polar materials and are very easy to adjust in terms of processing consistency and enable particularly flexible composites.
• Two-component adhesives based on epoxy resin can be specifically adjusted in terms of their properties and also enable curing at room temperature.
• Anaerobically curing adhesives consist of a mixture of dimethacrylic acid esters of certain diols with small amounts of peroxides and accelerators, the curing being carried out by polymerization.
• Adhesives based on MS polymers have a high elasticity and an almost universal adhesive spectrum.
• the adapter film In order to keep the loads on the connection system as low as possible when filling the tank, it is proposed to equip the adapter film with at least one expansion fold running in the horizontal direction.
• the expansion fold is already incorporated in the manufacture of the adapter film.
• the adapter film attached to the sealing membrane can then yield, without stressing the material.
• Another way of achieving expansion compensation when filling the tank is to provide the adapter film with an oversize in terms of its height dimension or width.
• elastic expansion means are arranged circumferentially or in sections between the adapter film and the inside of the tank wall, which are compressed into a flat state during the filling of the tank.
• the expansion means prevent the lining film and the adapter film from wrinkling in the lower region.
• the adapter film can then lay against the tank wall without wrinkling, the expansion means giving way and being pressed flat against the tank wall.
• an expansion agent such.
• elastic foam elements or an air-filled hose can be used, the air escapes as a result of the load occurring during filling through valves.
• connection system requires considerably less material and assembly and also fulfills the requirements for high tightness.
• the standing tank made of steel shown in Figure 1 is single-walled and consists of a cylindrical tank wall 1 and a flat tank bottom 2 and a curved cover.
• a tank is e.g. intended for the storage of heating oil and has a diameter of 20 m and a height of 17 m.
• the tank also has a closable opening in the form of a manhole on the cover (not shown in more detail).
• the empty tank is cleaned and the tank bottom 2 is checked for leaks, repaired if necessary and provided with a corrosion-inhibiting paint or sealed with a hardenable liquid plastic.
• the wall section provided as an adhesive point for fastening the strip-shaped sealing membrane 6 is roughened, cleaned and degreased.
• the leak protection lining consists of a cavity-forming insert 3, which completely covers the tank bottom 2 and extends on the inside of the tank wall 1 to the attachment point, and a flexible media-resistant lining film 4, which completely covers the cavity-forming insert 3 in the area of the tank bottom 2, and from an adapter film 5, which covers the lining film 4 in the bottom area by approximately 20 cm.
• the adapter film 5 is pulled up to the wall 1 to a height of approximately 1 m and is attached to the wall 1 with its upper reinforced edge section 5a all around by means of adhesive dots arranged at certain intervals. The stitching prevents the adapter film from falling down during further assembly.
• the adapter film 5 is provided at a height of approx.
• the strip-shaped sealing membrane 6 consists of a synthetic fiber mat 6a with an upper fastening section 6b and a lower fastening section 6c with a fiber structure which projects on both sides.
• a two-component epoxy resin is applied as an adhesive layer 7 in a thickness of 2 to 5 mm to the edge section 5a of the adapter film 5 pointing into the tank interior and the section of the wall 1 adjoining it.
• the application can be done with a spray gun with a wide slot nozzle.
• the consistency of the epoxy resin has been adjusted in such a way that dripping or draining downwards is impossible.
• the width of the surrounding adhesive layer is approx. 20 to 30 cm.
• the structure of the connection system is shown spatially offset in FIG. 1. Subsequently or already during the application of the adhesive, the strip-shaped synthetic fiber mat 6a is placed on the adhesive point 7 and pressed on by means of an offset pair of pressure rollers, the tough plastic epoxy resin penetrating the fiber structure of the synthetic fiber mat 6a in the region of the fastening sections 6b, 6c.
• a second epoxy resin layer 7a is sprayed onto the outside of the synthetic fiber mat 6a as a cover layer. After a curing process of several hours at room temperature, a firm, permanent, media-tight connection is achieved between the adapter film 5 and the lower section 6c of the strip-shaped sealing sheet 6 formed and between the upper section 6b of the sealing sheet 6 and the tank wall 1.
• the lower section of the adapter film 5 is connected to the lining film 4 by welding in the overlap region.
• the weld seam formed is marked with position 8.
• the expansion fold 5b is released, depending on the voltage that occurs, and the adapter film 5 is not subjected to any additional expansion stress.
• the cavity-forming insert 3 resting on the tank bottom 2 consists e.g. from a fleece-lined flexible PEHD grid that is rolled out.
• the actual leak protection lining can only be installed when the adapter film 5 is fastened to the tank wall 1 by means of the strip-shaped sealing membrane 6.
• FIG. 2 A further embodiment variant of the connection system is shown in FIG. 2.
• the floor area has not been shown, since it is designed analogously to the variant described above.
• the strip-shaped sealing sheet 6 consists of an approximately 4 mm thick PVC film 6d and is welded to the adapter film 5 in the area of the lower fastening section 6c.
• the weld seam is identified by reference number 10.
• the PEHD grid serving as a cavity-forming insert 3 extends analogously to the embodiment variant according to FIG. 1 to the fastening point.
• the upper fastening section 6b is fastened all round to the tank wall 1 by means of an adhesive layer 7 based on polyurethane.
• the adapter film 5 is only connected to the sealing membrane 6 and lies loosely against the cavity-forming insert 3.
• a circumferential elastic expansion round profile 11 made of soft foam is arranged below the fastening point between the adapter film 5 and the tank wall 1 and is attached to the tank wall 1 by gluing.
• the adapter film 5 which is arranged in excess, is arched and the necessary expansion compensation is created when filling the tank.
• the adapter film lies against the insert 3 and the elastic expansion profile 11 is pressed flat.
• FIG. 3 shows a further embodiment variant of the connection system for a tank.
• an adhesive layer 7 based on polyester is applied all around in the area of the fastening point, the width of which corresponds to the width of the strip-shaped sealing membrane 6.
• the adapter film 5 is applied with its upper fastening section 5a to the adhesive layer 7, offset downwards, so that the upper region of the adhesive layer remains free.
• the upper fastening section 6b of the sealing membrane 6, which consists of a glass fiber fabric 6a, is applied to this.
• the fastening section 5a of the adapter film is provided with perforations 12, so that when the adapter film 5 is pressed on, adhesive passes through the perforations 12 and the fabric layer of the glass fiber fabric 6a in the region of the lower fastening section 6c.
• a cover layer 7a made of polyester resin is applied to the glass fiber fabric 6a.
• a cover layer 7a made of polyester resin is applied to the glass fiber fabric 6a.
• the strip-shaped sealing membrane 6 consists of the glass fiber fabric and the polyester resin.
• the cavity-forming insert and the flexible lining foil can consist of the materials which are customary per se.
• the lining film can also consist of a multi-layer film system.
• connection system explained above is characterized by a low cost of materials and enables inexpensive installation.
• the possible material combinations can be optimally matched to the tank to be lined, the tank medium and the operating conditions.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Coating Apparatus (AREA)
• Details Of Rigid Or Semi-Rigid Containers (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• External Artificial Organs (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7954576

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (5)

Family Cites Families (11)

• 2001
  • 2001-03-20 DE DE20104828U patent/DE20104828U1/de not_active Expired - Lifetime
• 2002
  • 2002-03-19 PL PL02365387A patent/PL365387A1/xx unknown
  • 2002-03-19 AU AU2002310957A patent/AU2002310957A1/en not_active Abandoned
  • 2002-03-19 CZ CZ20032877A patent/CZ297076B6/cs not_active IP Right Cessation
  • 2002-03-19 WO PCT/EP2002/002987 patent/WO2002085715A2/de not_active Ceased
  • 2002-03-19 DE DE50201896T patent/DE50201896D1/de not_active Expired - Fee Related
  • 2002-03-19 AT AT02735143T patent/ATE285961T1/de not_active IP Right Cessation
  • 2002-03-19 EP EP02735143A patent/EP1373075B1/de not_active Expired - Lifetime

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