WO2000058184A1

WO2000058184A1 - Container for liquids with a leak monitoring device for storing water-incompatible materials

Info

Publication number: WO2000058184A1
Application number: PCT/EP2000/002663
Authority: WO
Inventors: Reiner Stolze
Original assignee: Ruhr Oel Gmbh
Priority date: 1999-03-27
Filing date: 2000-03-27
Publication date: 2000-10-05
Also published as: DE19914130A1; AU4290500A; DE10014805A1

Abstract

The invention relates to a container for liquids with a leak monitoring device for storing water-incompatible materials, comprising a cover (1) and a base (2). The container for liquids has a second inner base (4) consisting of a shaped part or a metal or plastic film which is fixed at the side to the cover (1) or the base (2), using at least one mechanical positive-fit connection, sealing compounds and/or adhesives.

Description

Liquid container with leak monitoring for the storage of water-polluting substances

The invention relates to a liquid container with leak monitoring for storing 5 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 as liquid containers for the storage of water-endangering substances. o According to the regulation on the storage of water-polluting substances, such liquid containers can be equipped with raised floors, which form a monitoring room for leak monitoring. A vacuum is generated in the monitoring room by a vacuum pump of a leak detector. In the event of a leak in the liquid container, the vacuum 5 is reduced and an alarm can be triggered by a pressure-dependent control.

Essentially two types of leak protection linings for liquid containers are known from the prior art. These can consist of a flexible leak protection lining, preferably of a plastic film, with which the respective liquid container is lined. For this purpose, foils made of polyurethane with an electrically conductive coating are used, for example, which contain an intermediate layer of electrically conductive synthetic polyester fleece. Leakage protection linings of this type are produced as ready-made inner casings and placed in the corresponding 5 liquid containers. They are usually attached to the steel dome spigot by means of a clamp connection with the help of a blind cover. Such prefabricated inner casings are to be prefabricated for small to medium-sized tanks (up to approx. 50 m ³ tank capacity), ie they can be used. Single-walled steel tanks as well as cylindrical tanks made of steel are suitable for the storage of unleaded petrol according to DIN EN 228 with a maximum of 3% by volume of methanol, for the storage of leaded super petrol according to DIN 51600 and for the storage of diesel fuel according to DIN EN 590. You need to comply with the "Guideline / Construction and Test Principles for Leak Detection Devices for Containers" of the technical rules for flammable liquids (TRbF 501), drawn up by the German Committee for Flammable Liquids (DAbF). 5 in particular more than 10 m and a floor area of more than 100 m ^2, in particular more than 5000 m ² , it is not possible due to the size to fit pre-made inner shells into this tank used polyester fleece pressed so that an o continuous surveillance room would no longer be guaranteed.

The use of the films used for single-walled steel containers according to DIN 6608-1 as a one-piece leak protection system is known. In the case of the assembled inner shells made of plastic, a complete inner sheath up to the dome spigot has always been assumed. This means a considerable expenditure of material, since for many existing tanks a storage space for the storage volume already exists or the tank jacket monitoring is possible from the outside and therefore in principle only the bottom of the liquid container has to be double-walled. Thus, the area of application of the film used as a ready-made inner shell is limited.

Tank linings for liquid containers are also known, in which a steel base is welded in as the second base plate. This design of the leak protection lining is mainly used for flat-bottom tanks according to DIN 4119 5. For this purpose, a second steel floor with spacers, for example made of wire mesh, is welded into the existing tank from sheet steel above the existing flat floor. Media-resistant materials for crude oil, for example the material 1.4539, are used as materials. These are welded into the existing liquid container using the MIG welding process, whereby there are various structural solutions for the edge stop or for the floating roof construction for fastening the second steel floor. Especially with existing older floating roof tanks, there are considerable problems in the practical implementation of such

Leak monitoring measures shown. In these older floating roof tanks 5, the steel floor, the floating roof support structure and the tank outer walls are generally made of unalloyed steel and thus have different material properties (e.g. different modulus of elasticity) than the second steel floor to be welded in. The result of this is that stresses or stress peaks occur at 0 changes in wall thickness and in the corner area, in particular the corner fillet seam, in the leak monitoring room. Additional temperature differential expansions when installing a second steel floor for leak monitoring also lead to additional stress conditions in the area of the corner angle when the tank is filled, as well as temperature differences between the lower and upper floor of the new double floor during the start-up phase. These lead to cracks or leaks in the system and an existing vacuum that is created in the interstitial space breaks down. Furthermore, the accessibility for the detection of underbody corrosion, for example by scanning, is no longer given or is only possible with a large repair effort. Previously known test methods are not suitable for determining or determining underbody corrosion on the lower steel floor in the presence of a second steel floor.

From DE 38 34 656 an arrangement for the subsequent sealing of an oil drip pan is known. This arrangement consists of a double layer of a film. The gap between the two layers is monitored by setting a negative overpressure. It does not appear from this document that a similar system can also be used for the interior lining of tanks. This would not be possible without further ado, since the space between the film layers could not be maintained when the tank o was filled due to the static pressure of the liquid column. A leak monitoring system is known from the German utility model G 93 11 620, which, however, does not work with the monitored cavity required in many regulations, but with an electrically conductive rubber lining which is intended to indicate leaks through changes in the electrical volume resistance.

It should be noted that both the construction of plastic systems for leak monitoring of liquid containers and the possibility of welding additional steel floors in are very complex. Both systems o have to be worked in manually with a lot of time and testing. The corresponding steel systems involve welding work,

Coating work, test work and steel construction work necessary, which require very long decommissioning times of the corresponding storage containers.

5 The technical object of the invention was therefore to provide a new liquid container which does not have the disadvantages described above, in particular can be manufactured in a less costly and labor-intensive manner, makes shorter decommissioning times possible and whose construction can be designed more flexibly. In particular, the second inner floor 0 should be easy to install and fasten with simple connecting means. In principle, there should be the option of being able to monitor possible leakages through a cavity formed between the floor and the second inner floor. Furthermore, a segmentation of the monitored areas should be possible. In particular, the system should be suitable for large tanks with a fill height of more than 5 m. Furthermore, the system should fundamentally offer the possibility of lining not only the floor, but also the jacket or side walls in an analog manner.

This technical problem is solved by a liquid container with o leak monitoring for the storage of water-polluting substances with a jacket or side walls (1), a bottom (2) and a second inner bottom (4) made of a molded part or a foil made of metal or plastic their Edges are attached laterally to the jacket (1) or to the bottom (2) by means of at least one mechanical positive connection or by means of casting compounds and / or adhesives. Instead of jacket or side walls, for the sake of simplicity only the term jacket is used in the following and in a non-restrictive manner. The floor can be flat or - e.g. B. spherical or cylindrical segment-like - curved.

The liquid containers can be stationary storage tanks or mobile transport tanks. The liquid containers can be storage and steel containers, in particular cylindrical containers according to DIN 6608-1, flat-bottom tanks according to DIN 4119, large-area storage and transport systems, for example for tankers, trucks and the monitoring of stockpiles. The system is particularly suitable for large flat-bottom tanks, especially those with a filling height of more than 4 m. 5 Such tanks can have a base area of more than 5000 m ² and a filling volume of up to 120 000 m ³ and more. The possible use of the subject matter of the invention depends primarily on the structurally predetermined and permitted fill level of the storage container and the strength-related execution of the clipboard required for this. Filling heights of approximately 30-40 m can be achieved with the container according to the invention.

The molded parts or foils for the second floor are made of media-resistant material, e.g. B. metal, especially aluminum or 5 austenitic steels. Plastic moldings, e.g. B. PVC panels, GRP panels are possible, especially those with a structure based on the teardrop principle.

As a preferred material for the second inner bottom, a plastic film o z. B. made of polyurethane or PVC. This can be equipped with an electrically conductive coating. The intermediate layer can contain an electrically conductive synthetic polyester fleece, e.g. B. type LSV 2. A preferred film thickness is 0.3 to 2 mm for metal and 0.5 to 3 mm for plastic, in particular 1 to 1.5 mm.

5 A leak protection lining from Wülfing and Hauck, Kaufungen is preferably used. It consists of an insert and an intermediate layer. The deposit consists, for. B. made of polyurethane (TPU) with an electrically conductive coating of the type WH 1 B / 2102 AB.

o Furthermore, PVC foils can also be used, such as Mipoplast heating oil tank foil R 9625/6 / SN from Dynamit Nobel, which meet the requirements for general building inspectorate approval for leak protection linings for heating oil or diesel fuel tanks installed outdoors (Z-65.30-166) . 5

The positive connection between the second floor and the floor or the jacket is preferably carried out via a clamp connection. For this purpose, a tube or a strip (5) is attached to the jacket (1) or to the base (2), to which the second base is attached by means of a spring construction or a clamping strip. However, other form-fitting connections are also possible which support quick, simple and inexpensive installation. The positive connection can also be designed as a drainage channel (9). It is further preferred that there is a cavity in the liquid container between the base (2) and the 5 second inner base (4), which cavity can preferably be filled with appropriate fillers (3) as spacers. For this purpose, for example, used in a preferred embodiment, expanded polystyrene (eg. As polystyrene ^®) sand, gravel and / or foams. Suitable foams are, for example, PUR, PVC or polyester foams, in particular o open-cell foams.

Preferably, non-metallic components, the second floor, the Form the cavity or the fillers and, if necessary, provide the laminate with electrical conductivity.

The connection of the second floor to the jacket of the storage container is preferably above the welded connection jacket / first floor (corner fillet weld). This constructionally required connection of the existing storage container with the vacuum applied can thus be monitored.

It may also be preferable to use the entire tank, i.e. H. also double-walled cladding or the side walls. In principle, the second inner floor is pulled up to the upper end of the jacket. With such a structure, not only the floor area but also the entire tank jacket, including the tank roof if necessary, can be monitored. Such a system enables the construction of a complete inner shell of a tank. This creates a flexible tank in the tank. One then speaks of a double wall. A complete leak monitoring of the tank is thus possible, so that a previously required collection space outside the tank, for example a drain pan, can be dispensed with.

It is also possible to subdivide the cavity together with the second floor into segregated segments and to monitor them separately, so that a possible localization of a possible leak is possible.

For the required size and shape of the monitoring room, the film itself or other products that do not damage the film, for example scrap tire residues or networks, e.g. B. made of wire. The plastic film is preferably shaped in such a way that it has knobs which are molded on the inside to form the base plate (2) and thus form a monitoring space for leak monitoring. Packed bodies for the leak monitoring room can then be dispensed with. A second film or similar products that allow easy and quick assembly can also be used. The products in the so-called surveillance room, the under Is under pressure, are not affected by the stock product and must be adjusted to the strength of the storage volume. In addition to the ready-made film, prefabricated metal or plastic molded parts can also be used, which are fastened to the jacket (1) of the liquid container by means of clamped or other positive connections. These form-fitting connections used for this can be adapted to any special design requirement.

Another possibility of attaching the second base, in particular a foil, is to attach it to the jacket using adhesives and / or potting compounds. For this purpose, a strip of material is preferably directed upwards at an acute angle and attached to the jacket. This strip is preferably made of metal, in particular an approximately 2 mm thick sheet, and is approximately 5 to 10 cm wide. This can be welded to the steel jacket. The preferred height is approximately 50 mm above the existing tank floor and is below the existing nozzle connection.

The film edge can then be pulled over the edge of the sheet metal strip into the bead formed between the sheet metal strip and the jacket and fastened. It is preferably attached using an adhesive. Suitable here is e.g. B. Colle R from SikaTrokal S. A. Preferably, the bead is then poured out with a media-resistant sealing resin and a curing process is carried out. A suitable casting resin is, for example, epple 28.

The measures described lead to a positive connection between the tank jacket and the film, which is vacuum-tight.

Preferably, the one attached to the jacket to form a bead

Strips of material on a bead directed towards the jacket side. This has the advantage that after pouring the bead with plastic resin this after

Curing cannot come off the bead without breaking material, itself if the lateral adhesion to the jacket and the sheet metal strip or the film should be lost.

The foils are usually laid as foil webs. In the case of plastic films, the webs can be connected to one another by HF or hot wedge welded connections. The individual film webs can also be connected with a media-resistant adhesive. Epple 4851, for example, is suitable here.

In the case of the liquid containers according to the invention, the use of sensor cables for the registration of hydrocarbons in the monitoring room is also possible without any effort. An adjustment of the cable diameter to the leak monitoring room is possible via the size of the packing used.

The liquid container according to the invention has considerable advantages over the prior art. The monitoring system can be installed quickly and easily. In the event of malfunctions, it can also be dismantled without much effort. It is possible to quickly repair the bottom of the tank in the event of external corrosion. In particular, the existing floor can be coated on the inside with a synthetic resin laminate before the second floor is introduced - or if corrosion damage is found after a few years. With such repair or preventive measures, resin-impregnated plastic or glass fiber mats are usually placed in one or more layers and a curing process of the synthetic resin is carried out.

Even after several years of operation, wall thickness measurements on the lower floor can be carried out quickly and easily. Due to the flexible construction of the monitoring room in the liquid container, it is not necessary, for example, to provide weld seams in the problem areas and the sealing area of the flat-bottom tanks or at the edge area. It is the use in riveted tanks is still possible. When changing the storage medium, the used foils, metal or plastic molded parts can be easily and quickly adapted. The system is still easy to connect to any sub-floor, such as concrete. The liquid container according to the invention is particularly suitable for temporary storage on smaller heaps for short-term storage or monitoring of water-polluting substances.

It is also possible to transport the system in a simple manner. It seals itself due to the subsequently applied vacuum and the weight or pressure of the storage medium. The surveillance room can be checked. The use of the system is also conceivable on tankers, thereby reducing the weight and thus increasing the payload of these tankers.

The areas of application of the liquid containers according to the invention can be seen wherever storage and monitoring and the transport of water-polluting liquids and substances are concerned. The durability of the films, metal or plastic systems used can be adapted to the storage medium.

With the liquid container according to the invention, one is able to monitor only the necessary areas for large containers, which must be monitored in accordance with the regulation on the storage of wastewater hazardous substances. This includes in particular the tank bottoms of corresponding liquid containers. The following figures are intended to explain the invention in more detail.

Figure 1a

Figure 1a shows a partial view of a flat bottom tank according to the invention in cross section. The number 1 denotes the jacket of the tank, the number 2 the bottom plate. The second inner bottom 4 is drawn into the tank as a ready-made film and fastened to the jacket 1 by means of a tube 5 and a corresponding spring 6. Packing bodies 3 are arranged in the monitoring room, which can consist, for example, of polystyrene foam segments.

Figure 1b

FIG. 1b shows a cross-sectional view of a cylindrical liquid container. Here, too, the inside of the container is lined with a second inner base, for example a corresponding plastic film 4. The attachment to the jacket of the tank is carried out via pipes 5 by means of a spring 6. With such cylindrical tanks, it is therefore no longer necessary to pull the second inner floor up to the dome. This can save considerable amounts of material.

Figure 2

Figure 2 shows a partial view of a flat bottom tank in cross section with a bottom plate with terminal block. The number 2 denotes the bottom plate of the tank, the number 4 the second inner bottom, which is fastened by means of the clamping strips 7 and the profile plates 12 located underneath. The monitoring room can be filled with packing 3. The profile sheets are welded onto the tank bottom as continuous profile sheets. A prefabricated film, a plastic plate or a metal plate can be used as the second inner bottom. The height of the monitored room should be <50 mm and is appropriate Try to determine individually. The clamping length, ie the protrusion of the lateral surface of the terminal strip with the second inner base, can also be optimized by tests.

Figure 3

Like FIG. 2, FIG. 3 shows a partial view of a liquid container with a bottom plate clamping strip and an additional drainage channel. The number 2 denotes the floor panel, the number 4 the second inner floor. The monitoring room is partially filled with packing 3. The second inner floor is fastened to the floor plate 2 by means of a profile plate 12 and a clamping strip 7. The terminal block 7 is designed so that it forms a drainage channel 9.

Figure 4

Figure 4 shows a partial view of a flat-bottom tank in cross section. Number 2 denotes the floor panel, number 4 the second inner floor and number 7 indicates the terminal strip used and the profile panel 12. A film is used here as the second inner floor 4, which has knobs on the underside, so that these form the monitoring space.

Figure 5

Figure 5 shows a floating roof tank. The floating roof support is designated by the number 10. The number 4 designates the second inner floor, the number 2 the floor panel and the number 3 the packing elements arranged in the monitoring room. The second inner floor is attached to the floating roof support by means of a clamping device. For this purpose, a clamping ring 11 made of two half-shells is used as well as a lower support tube 5, between which the second inner bottom is clamped and fastened. As can be seen in this example, the additional inner shelves used can be used as a ready-made film, steel, metal or plastic plates. It is possible to adapt the leak monitoring system to any special design requirement using clamps or other form-fitting connections.

Figure 6

Figure 6 shows a flat bottom tank in a partial view in cross section. The number 1 designates the jacket, the number 2 the floor panel and the number 4 the second inner floor, which is fastened to the jacket 1 and the floor panel 2 by means of clamping strips 7 and corresponding profile sheets 12. This attachment can be carried out below all sockets of the liquid container, the lateral height of the second inner base being between 50 and 80 mm, preferably above the welded connection between the jacket and the first base (fillet weld).

Figure 7

Figure 7 shows a partial view of the jacket in cross section. Number 1 designates the jacket, number 4 the second base, preferably a film, number 17 the attached material strip to form a bead and number 13 the plastic resin that fills the bead.

Figure 8

Figure 8 shows essentially the same structure as Figure 7. The reference numerals are identical. The attached strip 17 here has a bead directed towards the jacket side. After filling the bead with synthetic resin 13, this cannot come out of the bead without material destruction after hardening, even with loss of adhesion to the surrounding walls. This means further security for this type of positive connection. Reference list

coat

ground

Packing second inner bottom

Pipe / bar

feather

Terminal block

Leak monitoring room

Drainage canal

Floating roof support

Clamping ring with two half shells

Profile sheet

Potting compound pinned material strips

Claims

claims

1.Fluid container with leak monitoring for the storage of water-polluting substances with a jacket or side walls (1), a bottom (2) and a second inner bottom (4) made of a molded part or a foil made of metal or plastic, with its edges on the side of the jacket ( 1) or on the floor (2) by means of at least one mechanical positive connection or by means of casting compounds and / or adhesives.

2. Liquid container according to claim 1, characterized in that a cavity is present between the bottom (2) and the second inner bottom (4).

3. Liquid container according to claims 1 or 2, characterized in that the plastic film consists of polyurethane or PVC.

4. liquid container according to claim 5, characterized in that the plastic film has knobs which are formed on the inner side to the bottom (2).

5. Liquid container according to claims 1 to 4, characterized in that the bottom (2) is coated on the inside with a synthetic resin laminate.

6. liquid container according to claims 1 to 5, characterized in that it is a stationary storage tank or a mobile transport tank.

7. Liquid container according to claims 1 to 6, characterized in that the cavity is partly filled with fillers (3) serving as spacers, preferably foamed polystyrene, sand, gravel, non-woven materials, old tires, networks or foam.

8. liquid container according to claims 1 to 7, characterized in that the positive connection between the second bottom (4) and the bottom (2) or the jacket (1) via a clamp connection.

5 9. liquid container according to claim 8, characterized in that the clamping connection on the jacket (1) or on the bottom (2) attached pipes or strips (5) on which the second bottom (4) by means of a spring

(6) is attached.

ιo

10. liquid container according to claims 1 to 9, characterized in that the positive connection is simultaneously designed as a drainage channel (9).

11. Liquid container according to claims 1 to 7, characterized in

15 net that the film edge for fastening over the edge of a sheet metal strip tacked to the jacket (1) at an upward acute angle

(7) is pulled and glued and the space between the jacket (1) and sheet metal strip (7) is filled with a casting compound (3).

20 12. Liquid container according to claim 11, characterized in that the sheet metal strip (7) has a bead directed towards the jacket side.

13. Liquid container according to at least one of the preceding claims, characterized in that the second inner bottom to the top

25 end of the jacket is pulled up.

14. Liquid container according to at least one of the preceding claims, characterized in that non-metallic components are electrically conductive.