DE10353536B4 - Device for pressure-free leakage monitoring on vertical vessel walls - Google Patents

Abstract

contraption for pressure-free leakage monitoring on vertical tank walls and arranged at this outlet fittings of at least einschüssigen, single-walled tanks, containers or silos for storing liquids, especially of water polluting Liquids, with a the bottom of the tank shell or tank and enclosing the outlet fittings, to the atmosphere open catchment room (2) for the absorption of leakage fluid in case of leakage of the tank shell, which collecting space (2) from a with bottom plate (3) connected to the tank bottom and a side wall (5) is formed and at least one drainage pipe (6) with shut-off valve (8) for discharging the liquid from the collecting space, and at least one punctiform leakage agent (11), with a monitoring device (10) is connected, which in case of leakage, the shut-off valve (8) concludes, characterized in that the leakage means (11) on the side wall (5) of the collecting space (2) is arranged so that it can be mounted from the outside is, and that in the bottom plate (3) of the collecting space (2) at least a dome-shaped trough (9) is formed, to the ...

Description

The The invention relates to a device for pressure-free leakage monitoring on vertical tank walls and arranged at this outlet fittings of at least einschüssig, single-walled tanks, containers or silos for storing liquids, in particular of water polluting liquids, with a the bottom of the tank shell or tank and enclosing the outlet fittings, to the atmosphere open catchment area for the inclusion of leakage fluid at Leakage of the tank shell, which catchment area from one with the tank bottom connected bottom plate and a side wall is formed and at least a drainage nozzle with shut-off valve for removal the liquid from the collecting space, and at least one punctual leakage agent, that with a monitoring device is connected, which in case of leakage, the shut-off valve closes.

To protect against the escape of combustible, especially groundwater damaging liquids from tanks, containers or silos due to leaks, it is known either the dangerous liquid in above-ground tanks with collecting cup ( DE 1 264 736 A . DE 39 37 638 A1 ) or in double-walled underground tanks or tanks ( DE 40 15 821 A1 . DE 41 27 090 A1 ) to store. The monitoring of the cavity formed between the inner and outer sheath is then carried out by means of a vacuum monitoring, which detects a change in the negative pressure in the cavity due to leakage and displays.

The Collecting cups of above-ground tanks are made regularly a reinforced concrete floor and a cylindrical protruding from this Coat of sheet steel. The collecting cups are technically and in terms of cost very consuming, require a considerable amount of space and must be constantly checked for leaks become.

double vertical tank walls of aboveground tanks consist of several tank shells liquid-tight welded together Outer casing sheets, which represent the static load-bearing part of the tank construction. At the inside of the outer jacket there is a doubling by means of tear sheets, smooth plates with Fabric liners or with spacers, so that everyone such joined Tankmantelschuss forms a separate surveillance space. Everyone these interstices of the individually on top of each other arranged, tightly welded tank shell shots of entire tank construction requires separate vacuum monitoring, the total cost of increase the tank construction. To have to appropriate test leads to the individual control rooms and be moved to the measurement and evaluation center. These known vacuum monitoring devices allow while detecting a pressure loss, but can not determine whether welded joints, Flanges, inner jacket or the outer jacket are leaking.

In the case of large tank containers such as tanks with a capacity of 10,000 to 100,000 m ³ content, positioning sensor cables in the vertical cavity of the tank jacket will cause problems during installation and assembly. Increases in temperature when welding together the shrouds, mechanical effects when aligning the sheets, especially at the edge areas, have a negative effect on the sensitive sensor cable or probes.

One Replacement of sensor cables is hardly or only with a disproportionately high Effort possible, so that, for example, a conversion of the tank to another liquid Storage goods with other electrical properties not readily available possible is. The replacement of defective sensors is problematic.

From the DE 196 00 970 C1 it is known to protect against the escape of combustible, in particular groundwater damaging liquids, a height moderately at least partially below the bottom of the flat-bottomed structure and this Außenumfangsmäßig, preferably annular surrounding collecting space provide, which has a slope having a cantilever with the lower end of the outside Tank jacket is connected. On the cantilever or in the bottom area of the collecting space an arrangement of a sensor cable is arranged, which is selective to liquid hydrocarbons.

Other known solutions for detecting leaks in tank jackets or tank bottoms place sensor cables routed around the tank jacket ( US 3,721,898 . U.S. 4,404,516 ) or punctiform sensors ( US 5 831 148 A . US Pat. No. 6,311,547 B1 ) in the bottom area of the tank or at dispensers.

One Replacement of sensor cables is barely even with these solutions or only with a disproportionate in high Effort possible.

These disadvantages the state of the tried. Technology according to WO 02/085756 A1 in that a channel surrounding the channel is provided, which adjoins directly on the outer wall of the storage container and for collecting passing liquid serves. The gutter has a gutter that leads into at least one liquid collection container in which at least one detection system for the water-polluting liquids is positioned. The gutter drain is intended to drain the liquid collected in the gutter. to guide the fluid collection container.

The Liquid collecting tank lie distributed on the circumference of the tank construction and require a considerable material, Space and maintenance, making this known solution costly remains.

From the EP 0 705 773 B1 In addition, a storage tank with single-walled tank jacket and double-walled tank bottom is known, the cavity is also controlled by means of vacuum monitoring.

 at In this prior art, the object of the invention is to provide to improve a device of the type mentioned above in such a way that a location-accurate leakage monitoring on double-walled vertical tank walls with little effort, high robustness and reliability, Maintenance and ease of use even with different bearing fluids possible is, with an exchange of sensor means depending on the type and characteristics the storage liquid guaranteed becomes.

These The object is achieved by a device of the type mentioned solved with the characterizing features of claim 1 and 4.

advantageous Embodiments of the method and the device are the dependent claims.

The inventive device is characterized by the fact that the leak probes for detection of liquids from the outside are easily accessible, easy to install depending on the nature and properties of the liquid stored goods replaced can be without a complete emptying of the tank construction necessary becomes.

The leaking fluid collects either in the circumferentially distributed in the bottom of the catchment area Troughs or in the low point of the sloping drainage nozzle the collecting space, which are each associated with leakage probes.

Becomes leaking fluid found, the drain is interrupted from the catchment area and the flat bottom tank for the purpose of initiating repair work emptied.

There every hollow is so simple, freely accessible from the outside Assigned arrangement of a leakage probe, the leak location can be quickly, uncomplicated and easy to determine.

The Maintenance and ease of use of the device according to the invention is the conditions of rough tank operation under all weather conditions adjusted accordingly well.

From particular advantage is that existing tank structures without very high Retrofitted effort can be to the requirements of the Water Resources Act (WHG) and the ordinance Plants endangered Substances (VawS). For new buildings, the elaborate tank collecting cups omitted.

The Invention is for conductive and non-conductive as well as combustible liquids equally usable and for Tank construction of any size suitable.

The Invention will be explained in more detail below using an exemplary embodiment.

It demonstrate:

1 an embodiment of the solution according to the invention with in the collecting space. arranged wells for collecting leakage fluid and

2 a further embodiment of the solution according to the invention of a radially displaced from the tank shell to the outside under slope collecting space with drainage nozzle.

The 1 shows the principle of the solution according to the invention. Around the single-walled cylindrical tank jacket 1 a flat bottom tank, not shown in the totality is a collecting space 2 placed. The catchment room 2 is from a floor panel 3 that to the ground 4 the flat bottom tank is welded, and a side wall 5 formed, which in turn with the outer edge of the floor panel 3 is welded. The floor panel 3 runs horizontally or with a gradient radially from the tank jacket 1 outward. In the floor panel 3 the collection room 2 is a hollow 9 formed, which is suitably formed by a dished bottom. If several troughs 9 for collecting leakage fluid in the collecting space 2 should be provided, these are arranged circumferentially diametrically opposite each other. At the lowest point of this side wall 5 at about the height level of the floor panel 3 there is a drainage nozzle 6 for connecting at least one discharge line 7 for in the collection room 2 collecting Rainwater. The drainage nozzle 6 leads through the discharge line 7 through which the rainwater from the catchment room 2 is derived.

The shut-off valve 8th For example, a ball valve with electric drive is by a monitoring device 10 driven, with one in the hollow 9 reaching in leakage sensor 11 connected is.

The leakage probe 11 is in its position appropriate by one on the side wall 5 attached spigot 12 held and in the hollow 9 guided.

Is the tank jacket 1 Leaking, bearing liquid passes by gravity into the collecting space 2 and flows together with the rainwater into the basin 9 from. Since hydrocarbons are lighter than water, the leakage fluid collects on the surface of the precipitation water in the trough 9 , The leakage probe 11 detects the presence of leakage fluid and communicates corresponding changes, such as capacity changes, to the monitoring device 10 that the physical changes in setting commands for the shut-off valve 8th implements. The shut-off valve 8th closes and stops the outflow of rainwater into the discharge line 7 , The leaking flat bottom tank can then be serviced and repaired accordingly.

Less expensive is the embodiment of the device according to the invention 2 ,

The floor panel 3 the collection room 2 runs with gradient α radially from the tank shell 1 to the outside and has its low point TP where the drainage pipe 6 with shut-off valve 8th is arranged.

On the drainage pipe 6 is preferably in a vertical position of the drainage nozzle 6 put on by the leakage probe 11 to the TP in the drainage nozzle 6 is guided. The further structure corresponds to that in the 1 described variant.

1

tank shell

2

staging area

3

floor panel

4

ground of the flat bottom tank

5

Blechaufkantung (Side wall)

6

drain studs

7

discharge

8th

Shut-off

9

drainage sump

10

monitoring device

11

leak probe

12

Support

Claims (10)

Apparatus for pressure-free leakage monitoring on vertical tank walls and arranged at this outlet fittings of at least einschüssigen standing, single-walled tanks, containers or silos for storing liquids, especially water-polluting liquids, with a the lower portion of the tank shell or container and the outlet enclosing enclosing, open to the atmosphere Catchment room ( 2 ) for the absorption of leakage fluid in case of leakage of the tank shell, which collecting space ( 2 ) from a bottom plate connected to the bottom of the tank ( 3 ) and a side wall ( 5 ) is formed and at least one drainage nozzle ( 6 ) with shut-off valve ( 8th ) for discharging the liquid from the collecting space, and at least one punctiform leakage agent ( 11 ) provided with a monitoring device ( 10 ), which in case of leakage, the shut-off valve ( 8th ), characterized in that the leakage agent ( 11 ) on the side wall ( 5 ) of the collecting space ( 2 ) is arranged so that it can be mounted from the outside, and that in the bottom plate ( 3 ) of the collecting space ( 2 ) at least one dome-like trough ( 9 ) is formed at its lowest point (TP) the leakage agent ( 11 ) to measure the leakage directly: Apparatus according to claim 1, characterized in that at least one trough ( 9 ) with associated leakage agent ( 11 ) in the catchment area ( 2 ) is arranged. Apparatus according to claim 1, characterized in that preferably up to four wells ( 9 ) are arranged diametrically opposite each other on the circumference. Apparatus for pressure-free leakage monitoring on vertical vessel walls and arranged on this outlet fittings, at least einschüssigen standing, single-walled tanks, containers or silos for storing liquids, especially water polluting liquids, with a the lower portion of the tank shell or container and the outlet fittings enclosing to the atmosphere open catchment area ( 2 ) for the absorption of leakage fluid in case of leakage of the tank shell, which collecting space ( 2 ) from a bottom plate connected to the bottom of the tank ( 3 ) and a side wall ( 5 ) educated and at least one drainage nozzle ( 6 ) with shut-off valve ( 8th ) for discharging the liquid from the collecting space, and at least one punctiform leakage agent ( 11 ) provided with a monitoring device ( 10 ), which in case of leakage, the shut-off valve ( 8th ), characterized in that the leakage agent ( 11 ) mountable from the outside as part of the drainage nozzle ( 6 ) outside the catchment area ( 2 ) in flight of the gradient (α) to the low point (TP) of the drainage nozzle ( 6 ) connected. Apparatus according to claim 1 to 4, characterized in that the leakage agent ( 11 ) of one on the side wall ( 5 ) flanged or with the drainage nozzle ( 6 ) associated receiving socket ( 12 ) is kept plugged and replaceable. Apparatus according to claim 1 to 4, characterized in that the leakage agent ( 11 ) is a leakage probe or a responsive to change in electrical conductivity electrode assembly. Apparatus according to claim 1 to 4, characterized in that the emptying nozzle ( 6 ) at the level of the floor panel ( 3 ) or approximately at the level of the low point (TP) of the gradient (α) is arranged. Apparatus according to claim 1 to 4, characterized in that the shut-off valve ( 8th ) is a ball valve with electric drive, a slide or a valve. Apparatus according to claim 1 to 4, characterized in that display and / or alarm means are provided for indicating a leakage of the tank shell, which with the monitoring device ( 10 ) are connected. Device according to claim 9, characterized in that that the alarm means are optical and / or acoustic means.