EP0754635A1 - Doppelwandiger Tank und Verfahren zu dessen Herstellung - Google Patents

Doppelwandiger Tank und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0754635A1
EP0754635A1 EP96810450A EP96810450A EP0754635A1 EP 0754635 A1 EP0754635 A1 EP 0754635A1 EP 96810450 A EP96810450 A EP 96810450A EP 96810450 A EP96810450 A EP 96810450A EP 0754635 A1 EP0754635 A1 EP 0754635A1
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EP
European Patent Office
Prior art keywords
tank
layer
wall
elastomer layer
synthetic resin
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.)
Withdrawn
Application number
EP96810450A
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German (de)
English (en)
French (fr)
Inventor
Werner Bachmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Adisa Service und Entwicklungs AG
Original Assignee
Adisa Service und Entwicklungs AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Adisa Service und Entwicklungs AG filed Critical Adisa Service und Entwicklungs AG
Publication of EP0754635A1 publication Critical patent/EP0754635A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • B65D90/028—Wall construction hollow-walled, e.g. double-walled with spacers

Definitions

  • the present invention relates to a double-walled tank, in particular for storing oil, petrol or solvents, with an inner wall and an outer wall, the outer wall being formed from a spacer film and at least one plastic layer connected to the spacer film and by means of the spacer film a between the inner and the outer wall lying cavity is created, which can be checked for leakage by means of excess or negative pressure.
  • bitumen layers are that such coatings can be produced inexpensively.
  • a subsequent check of the bitumen layer is often impossible. Wherever conditions permit, the check is complex, since the entire shift must be examined in each case.
  • Epoxy resin layers are resistant and protect the tank from corrosion.
  • epoxy resin layers are relatively brittle and that they can be easily damaged, for example during transport. If there are small damaged areas or even hairline cracks in the dielectric plastic layer, an electrical connection between the metal wall and the surrounding soil, reinforced concrete walls etc. can occur. Electrical currents occur at the damaged areas, causing rapid corrosion of the metal.
  • An effective one Corrosion protection therefore requires good adhesion of the epoxy resin to the outside of the tank. This can only be achieved if the outer wall of the tank is carefully cleaned before the resin is applied, which of course is time-consuming. It is also disadvantageous in terms of production that several coats of epoxy resin are usually necessary and that the drying time is approx. 2-3 days.
  • coated metal tanks have the major disadvantage that the outer coating can usually no longer be checked for possible damage.
  • double-walled steel tanks with a cavity between the inner and outer walls have been used increasingly in recent years. Such tanks have the advantage that they e.g. can be checked for leaks using a vacuum applied to the cavity. It is therefore not necessary to examine the entire outer coating, as is the case with the coated tanks mentioned at the beginning.
  • double-walled steel tanks have the major disadvantage that they are very expensive to manufacture and that external corrosion protection cannot be dispensed with.
  • Leak tests using vacuum or overpressure generally have the immense advantage that they can also be used at any time in tanks that are buried in the ground. They are therefore suitable for the continuous monitoring of double-walled tanks.
  • the cavity of double-walled tanks can also serve to hold a warning liquid, or sensors protruding into the cavity can be used to detect the penetration of liquid into the cavity.
  • the CH-PS 471 728 describes a double-walled tank with an inner wall made of steel and an outer wall made of plastic, wherein a flat spacer is arranged between the inner and the outer wall.
  • the glass fiber reinforced Polyester-plastic outer wall is applied to the spacer formed by a film.
  • the cavity formed by the spacer film between the inner and the outer wall is intended to contain a warning liquid in order to be able to detect a possible leakage of the inner or outer wall.
  • the thermosetting plastic layer gives the tank casing good stability, so that the cavity between the inner and outer wall is preserved even under heavy loads.
  • a disadvantage of the double-walled tank described, however, is the brittleness of the outer layer made of polyester.
  • the outer wall can crack as a result of temperature fluctuations or alternating loads.
  • Another disadvantage is the relatively complex production process, in which two layers of glass fiber fabric usually have to be worked into the polyester resin in order to achieve the necessary stability of the outer wall. If GRP laminates are damaged, so-called "open" fibers are formed, on which liquid can penetrate into the cavity (capillary action). This removes the cathode protection at these points.
  • Another disadvantage is that the long curing times required for the polyester resin make it necessary to have large production facilities in which several tanks can be processed at the same time.
  • the CH-PS 618 658 also describes a double-walled tank with a spacer fabric located between the inner and outer wall.
  • the spacer fabric consists of wrapping paper.
  • a coating gasoline, oil and alcohol resistant coating color is applied to the wrapping paper (Etoplate 6), which inhibits the diffusion of gasoline, oil and alcohol vapors.
  • Etoplate 6 is a colored epoxy resin.
  • the coating color can be sprayed on or even filled, with fiber chips being added to the coating color. The addition of fiber chips is necessary to give the wall a certain toughness and to reduce the risk of cracking. Due to the open porosity of the According to CH-PS 618 658, packaging paper results in an intimate connection between the first color layer and the packaging paper. In practice, the coating described above was only used as an interior lining.
  • No. 4,844,287 proposes to first clothe a tank on the outside with a first elastomer layer and then with a liquid-permeable textile material which was previously coated with a second elastomer layer.
  • the elastomer layers are preferably polyurethanes with a high solids content. Since such a plastic only to a certain depth in the Penetrates textile material, the coated textile material remains liquid-permeable, so that liquid emerging from the tank penetrate the tissue and can be detected with known detection devices.
  • the tank casing described has the disadvantage that a leak can only be determined with a certain time delay. In addition, once a damaged area has occurred, a later leak check may not be possible, since the textile material is soaked with liquid.
  • US 5,000,342 discloses a tank with a permeable first separation layer and a second fiber-reinforced plastic layer.
  • the outer plastic layer can be formed from a wide variety of plastics.
  • the separating layer has a large number of holes through which the fiber-reinforced plastic applied to the outside is connected to the tank.
  • the object of the present invention is to provide a double-walled tank in which the disadvantages mentioned at the outset are largely avoided.
  • a tank in particular a steel tank, is to be provided with an outer casing which is not susceptible to injury, so that the tank can be transported and moved without problems.
  • the double-walled tank should continue to be easy and inexpensive to manufacture and e.g. Leakage can be checked at any time by means of vacuum or overpressure.
  • a double-walled tank of the type mentioned at the outset is characterized in that the plastic layer is an elastomer layer which is formed from a multi-component synthetic resin.
  • spacer foils such as, for example, aluminum knobbed foils, if instead of, as is known, coated with a thermosetting plastic, only with an elastomer plastic, practically no or only insignificant even under very high loads Deformations are suffered, so that the cavity between the inner and outer walls necessary for a later leak test, for example using a vacuum, is retained.
  • tanks with outer coatings made of an elastomer also have the advantage that they can be stored, transported and moved without any problems.
  • the elastomeric outer layers produced have the advantage that their vulnerability is significantly lower than that of thermosetting layers made of epoxy or polyester resin.
  • the risk that the outer wall could be injured is very low due to its rubber-like elasticity.
  • the elasticity is advantageously retained even at low temperatures of, for example, -20 ° C.
  • Conventional coatings made of epoxy resin or polyester are rigid and brittle at temperatures of around 0 to -20 ° C.
  • epoxy resin or polyester coatings have the disadvantage that residual stresses occur in the plastic layer due to aging.
  • the outer wall of a tank can be manufactured extremely quickly.
  • Another big advantage is that there is no need for glass fibers or glass fabric in the elastomer layers. So no "open" fibers can form. This not only results in material savings, but also in a much more rational way of production than with conventional tanks.
  • the elastomer layer applied to the spacer is also an excellent dielectric, so it is a good cathode protection for a metal tank wall.
  • the elastomer layer is advantageously formed from isocyanate / polyol compounds or diamine compounds, in particular urea compounds.
  • Elastomer layers with good material properties, such as hydrolysis, solvent and UV resistance and high dielectric constant.
  • resin systems available on the market today that are highly reactive and sprayable.
  • Elastomer layers formed from isocyanate / polyol compounds or essentially only from urea compounds have good chemical resistance, for example to gasoline or oil.
  • polyurea layers are generally less elastic than polyurethane / urea layers, they have the advantage that they are more impermeable to gases.
  • the elongation at break of the elastomer layer is expediently at least 10 to 20 percent at 20 ° C.
  • the elastomer layer particularly advantageously has an elongation at break of more than 100%, preferably more than 200% at 20 ° C. In comparison to epoxy resin layers, such layers are much more elastic and hardly vulnerable. If such layers are scratched during transport, for example, no leakage currents can still occur.
  • the elastomer layer expediently has a layer thickness between approximately 1 and approximately 5 mm, preferably between 2 and 4 mm. Elastomer layers of this thickness have a good insulation effect.
  • any foil and / or braid that is suitable for forming a cavity between the tank and the adjacent surface of the foil can be used as a spacer foil, an aluminum knobbed foil is preferably used.
  • An inexpensive variant envisages using a spacer film made of cardboard. In the latter case, it is important to prime the box. This can improve the adhesion of the elastomer layer to the cardboard.
  • the primer preferably an epoxy resin, makes the cardboard largely gas-impermeable, that is, gas diffusion through the cardboard is prevented.
  • the elastomer plastic forms a firm bond with the cardboard. This can result in such a large reinforcement of the cardboard knobs that, surprisingly, they are not compressed even when the tank is full.
  • the use of cardboard films for the production of an elastomer-coated tank outer wall is therefore a cost-effective and interesting alternative to the more expensive aluminum knobbed films.
  • Elastomer layers with a low gas permeability are preferably used in conjunction with cardboard knobbed films.
  • the tensile strength of the elastomer layer is advantageously greater than 7 MPa, preferably greater than 10 MPa, in particular greater than 12 MPa.
  • the synthetic resin components expediently have a low viscosity, so that they can be sprayed in a spray gun with forced mixing or, preferably, with direct swirling. In the latter case, the components are mixed with one another and sprayed on directly in the spray nozzle. This allows the outer layer to be produced efficiently. UV stabilizers, dyes or other conventional additives can also be contained in the elastomer layer.
  • the present invention also relates to a method for producing a double-walled tank, which is characterized in that a layer of a reactive multi-component synthetic resin is applied to the spacer film to form an elastomer layer.
  • reactive means that the components, once brought together, react practically immediately.
  • the reaction mixture should therefore have a short gel time so that the reaction mixture can be sprayed on without forming webs or dripping from the tank.
  • the reaction mixture advantageously reaches a viscosity value of approximately 50,000 mPa * s within a maximum of approximately 500 seconds, preferably within a maximum of 200 seconds. This makes it possible to coat a cylindrical tank almost continuously. The tank can be stored on rollers, rotated and simultaneously sprayed with the reaction mixture. It is also possible to apply several layers in succession. Further advantageous procedural measures can be found in the subclaims.
  • FIG. 1 shows a section of a double wall 11 of a tank in section.
  • the double wall 11 has an inner wall 13 made of steel, a spacer film 15 and an elastomer layer firmly connected to the spacer film 15.
  • the spacer film can be made of aluminum sheet, cardboard or plastic. Appropriate aluminum spacers have a thickness between 0.1 and 0.2 mm and are primed on both sides.
  • the primer ensures good adhesion of the elastomer layer, so that a good bond is formed between the spacer film and the plastic.
  • the primer coating on the side facing the tank wall acts as an insulation layer. Since the depressions formed by the knobs are filled with the elastomer plastic, pressing the knobs in is practically impossible.
  • the epoxy primer or polyurethane / epoxy primer from Adisa AG, Urdorf, Switzerland, are used.
  • a double-walled tank is produced as follows: First, strips of preferably gas or liquid-impermeable spacer films are attached to the outside of the tank, usually a steel tank. This can e.g. with the help of double-sided adhesive tape strips, which are previously glued to the tank at certain intervals. Alternatively, the tank can first be sprayed with a contact adhesive. The aluminum or cardboard film webs are laid on the tank outer wall in such a way that the edge areas of the film webs overlap. The overlap zones are then preferably additionally covered with an adhesive tape, e.g. Aluminum adhesive tape, covered to prevent penetration of the sprayed-on synthetic resin mixture into the cavity between the spacer film and the inner wall of the tank. As soon as the tank or parts of it are completely covered with spacer films, the multi-component mixture can be sprayed on.
  • an adhesive tape e.g. Aluminum adhesive tape
  • a reactive polyurethane / polyol mixture which cures rapidly at room temperature is preferably used as the multi-component mixture.
  • Contains quick-curing mixtures Polyisocyanates (eg aliphatic, cycloaliphatic or aromatic di- and triisocyanates and / or mixtures thereof) and polyols and / or diamines or mixtures thereof.
  • the isocyanates are preferably already prepolymers.
  • Aromatic diamines, urea or urea compounds are used as diamines.
  • Solvent-free two-component systems that can be used in a ratio of 1: 1 are particularly advantageously used. These are then mixed and sprayed directly in the spray nozzle of a spraying system. This process can also be automated. Due to the short curing time of the quick-reacting mixture, the tank can be checked for leaks practically immediately after its completion.
  • a maximum load of 20 kN (corresponding to a compressive stress of 2 N / mm2) was applied to a sample material using steel plates with a loading speed of 0.01 N / mm2 per second and the load-path diagram was recorded. After the load, the knobs were examined for traces of deformation. In a further test, a load of 10 kN was applied to check the creep behavior and left on the sample for 3 hours. The increase in strain was recorded.
  • the 100 x 100 mm sample material consisted of an aluminum studded film coated with Adalastic®.
  • the three-layer elastomer layer had a layer thickness between approximately 2.2 and 3.2 mm (measured on and between the knobs).
  • the load-path diagram showed a linear course and showed no signs of yielding by pressing in the knobs.
  • the test specimen only deformed by 0.4 mm, with only a very slight flattening of the Pimples was visible.
  • the increase in compression was only about 0.04 mm.
  • double-walled tanks for storing petrol and oil with an outer wall made of an elastomer with high tensile strength (elongation at break) and good tensile strength are much less susceptible to injury than known tanks with epoxy resin or polyester layers.
  • elastomer coatings can be produced in one operation by spraying on using reactive, fast-curing multi-component resins with the shortest possible gelation time.
  • the elastomer layer ensures very good electrical insulation of the metal tank shell (tank inner wall) and at the same time forms a hard-wearing, stable outer wall that can have the necessary toughness without glass fabric or fiber chips and essentially without fillers. It has been shown that the cathode protection achieved with the elastomer coating is considerably more reliable than that of epoxy or polyester coatings.
  • a significant advantage of the tanks according to the invention is that the outer casing can be produced before the tank is moved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP96810450A 1995-07-17 1996-07-12 Doppelwandiger Tank und Verfahren zu dessen Herstellung Withdrawn EP0754635A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2101/95 1995-07-17
CH210195 1995-07-17

Publications (1)

Publication Number Publication Date
EP0754635A1 true EP0754635A1 (de) 1997-01-22

Family

ID=4225903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810450A Withdrawn EP0754635A1 (de) 1995-07-17 1996-07-12 Doppelwandiger Tank und Verfahren zu dessen Herstellung

Country Status (3)

Country Link
EP (1) EP0754635A1 (cs)
CZ (1) CZ209196A3 (cs)
HU (1) HUP9601948A3 (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2014580A1 (de) * 2007-07-10 2009-01-14 Gewässerschutz-Systeme Europa Werner Bachmann Leckschutzauskleidung, sowie doppelwandiger Tank mit solcher
EP2067719A1 (de) * 2007-12-05 2009-06-10 OnO Waterprotection GmbH Distanzgebilde für die Leckschutzauskleidung eines Tanks, Leckschutzauskleidung und Tank mit einem solchen Distanzgebilde
EP2441567A1 (de) 2010-10-14 2012-04-18 OnO Oil GmbH Verfahren zum Sanieren eines Tanks
EA016651B1 (ru) * 2009-04-28 2012-06-29 Оно Уотерпротекшн Гмбх Защищающая от утечки оболочка, а также резервуар с двойными стенками с такой оболочкой
CN107472734A (zh) * 2016-06-08 2017-12-15 沃尔夫坦克-阿迪萨控股股份公司 箱罐和为箱罐加衬里的方法
AT518760A1 (de) * 2016-06-13 2017-12-15 Wolftank-Adisa Holding Ag Leckschutzfolie für einen Fluidtank

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509016A (en) * 1966-02-16 1970-04-28 Goodyear Tire & Rubber Self-sealing fuel cell wall
DE2658088A1 (de) * 1976-12-22 1978-07-06 Tank Und Apparatebau W Ermert Tank zur lagerung von fluessigkeiten und verfahren zu seiner herstellung
US4339506A (en) * 1981-01-12 1982-07-13 Chloeta F. Martin Diffusion resistant rubber liner and laminates formed therefrom
US4844287A (en) * 1987-11-13 1989-07-04 Long Delmar D Leak containment system for underground storage tanks
US5000342A (en) * 1990-05-02 1991-03-19 Sharp Bruce R Double walled storage tank systems with enhanced strength

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509016A (en) * 1966-02-16 1970-04-28 Goodyear Tire & Rubber Self-sealing fuel cell wall
DE2658088A1 (de) * 1976-12-22 1978-07-06 Tank Und Apparatebau W Ermert Tank zur lagerung von fluessigkeiten und verfahren zu seiner herstellung
US4339506A (en) * 1981-01-12 1982-07-13 Chloeta F. Martin Diffusion resistant rubber liner and laminates formed therefrom
US4844287A (en) * 1987-11-13 1989-07-04 Long Delmar D Leak containment system for underground storage tanks
US5000342A (en) * 1990-05-02 1991-03-19 Sharp Bruce R Double walled storage tank systems with enhanced strength

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2014580A1 (de) * 2007-07-10 2009-01-14 Gewässerschutz-Systeme Europa Werner Bachmann Leckschutzauskleidung, sowie doppelwandiger Tank mit solcher
EP2067719A1 (de) * 2007-12-05 2009-06-10 OnO Waterprotection GmbH Distanzgebilde für die Leckschutzauskleidung eines Tanks, Leckschutzauskleidung und Tank mit einem solchen Distanzgebilde
EA016651B1 (ru) * 2009-04-28 2012-06-29 Оно Уотерпротекшн Гмбх Защищающая от утечки оболочка, а также резервуар с двойными стенками с такой оболочкой
EP2441567A1 (de) 2010-10-14 2012-04-18 OnO Oil GmbH Verfahren zum Sanieren eines Tanks
CN107472734A (zh) * 2016-06-08 2017-12-15 沃尔夫坦克-阿迪萨控股股份公司 箱罐和为箱罐加衬里的方法
AT518760A1 (de) * 2016-06-13 2017-12-15 Wolftank-Adisa Holding Ag Leckschutzfolie für einen Fluidtank
AT518760B1 (de) * 2016-06-13 2018-04-15 Wolftank Adisa Holding Ag Leckschutzfolie für einen Fluidtank

Also Published As

Publication number Publication date
HUP9601948A3 (en) 1998-04-28
HU9601948D0 (en) 1996-09-30
HUP9601948A2 (en) 1997-03-28
CZ209196A3 (en) 1997-02-12

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