DE20005521U1 - Standing flat-bottom tank, double-walled, in a transverse oval shape - Google Patents

Description

CHEMOWERK GmbH

Factory for containers and transport equipment
In the Backenländer

D-71384 Weinstadt Description Page 1

Vertical flat bottom tank, double-walled, in transverse oval shape

Description

Due to regulations, substances hazardous to water are often stored in double-walled tanks with a leak monitoring system.

These should offer optimum protection against leaks and, if possible, be suitable for various leak monitoring systems. In addition, the aim should be to ensure that the part of the tank exposed to the contents remains tight even if certain overpressures or underpressures occur in the tank, which cannot always be completely excluded due to the process involved.

In addition, a space-saving tank shape and as little dead weight as possible under simple manufacturing conditions should be achieved.

Finally, a tank wall that is at least partially transparent is advantageous for checking the contents.

These problems underlying the innovation are solved by the teaching of the main claim in conjunction with the subclaims. The innovation is illustrated by figures I to III, each of which shows the basic details.

The drawings show in

Fig. I a, b, c Total tank in the 3 main views

Fig. Il Section A-A from Fig. I

Fig. III Section B -B from Fig. I

A closed tank consists of a standing, oval cylinder (1), a flat base (2) and an outwardly curved roof (3). The cylinder (1) and the base (2) are each double-walled, while the roof (3) is single-walled. In the container cylinder (1), the two walls are kept at a certain distance by a spacer grid (4), while in the base they are kept at a certain distance by spacer bars (5). The spacer grid (4) and the spacer bars (5) are each force-fitted to the outer and

Description Page 2

This design makes both the cylinder (1) and the base (2) very rigid with little use of material (sandwich effect).

At the same time, the resulting free space between the outer and inner walls can be used as a monitoring space, which is suitable for both negative and positive pressure, for conventional pressurized leak monitoring systems.

The roof (3), on the other hand, is only designed with a single wall and is curved in such a way that in the event of internal tank pressure or external overpressure, only relatively uncritical tensile or compressive forces occur in the central main area (curved area) of the roof wall.

The edge of the roof (brim area) is drawn vertically downwards with a small radius. This allows the roof to be pulled over the container cylinder and connected using adhesive (6).

When the tank internal pressure or external overpressure mentioned above occurs, the tank cylinder wall is pushed inwards or outwards. This creates strong bending forces in the rim area and strong peeling forces in the bonding area. These in turn lead to failure in the rim and bonding area of the roof much earlier than in the other tank areas.

On the other hand, the tank cylinder is so inherently rigid due to the double-walled nature of its walls that it remains stable and leak-proof even without a roof when filled.

Overall, the overall design described ensures that the container is only damaged to such an extent that the filled area of the container remains sealed, even in the case of internal and external pressure loads which are not foreseen but cannot be completely ruled out in the event of process-related malfunctions.

This effect is achieved in particular by the roof, which is designed as a defined failure element.

Due to its flat shape, the tank bottom (2) is subjected to significantly greater bending stresses due to the aforementioned internal and external pressures than the shell walls of the tank cylinder. This tank bottom area must therefore be particularly rigid.

The necessary force connection between the inner and outer walls is therefore no longer reliably achieved by a spacer grid (4). In this floor area, the inner and outer walls of the floor are therefore not connected by a spacer grid (4), but by spacer bars (5) lying next to one another and preferably arranged in the main force direction.

Especially when the tanks described are made of fiber-reinforced plastic, it is advantageous for production if the individual components can be connected to one another in as few operations as possible.

Description Page 3

For this reason, the connection of the tank base to the tank cylinder is preferably made in the manner shown in Fig. III. The tank base is stepped in the edge area (7). This tank base is then integrated into the winding process during the manufacture of the tank cylinder (1). This saves time and also creates a good connection. In addition, the air-permeable connection (8) between the walls of the base and the cylinder, which is necessary for leak monitoring, can be easily produced.

In contrast to the outside and inside of the tank, which can easily be made transparent from plastics, the latter was not possible with the spacer grid (4) and the spacer bars (5). However, this is now possible thanks to further developments in materials.

Therefore, tanks of the type described can now be made from metallic materials as well as from non-transparent or transparent non-metallic materials. In the latter case, this also enables simple optical tank level control.

Claims (7)

1. Vertical flat-bottomed tank with double walls in a transverse oval shape, characterized in that the tank cylinder and the tank bottom each consist of rigid outer and inner walls, which are connected to one another in a force-fitting manner by a rigid spacer element, and the roof is single-walled and curved outwards with a radius corresponding to the static requirements, and is provided with an edge rim ( 3a ) drawn downwards with a small radius. 2. Upright flat-bottom tank according to claim 1, characterized in that the roof ( 3 ) is placed over the tank cylinder ( 1 ) and is connected to it by adhesive or a similar connection. 3. Upright flat-bottom tank according to claim 1 and 2, characterized in that the floor plan form an elongated oval, which consists of a large radius of the long sides and a small radius of the head sides. 4. Upright flat-bottom tank according to claims 1 to 3, characterized in that in the double-walled areas the two walls are connected to one another in a force-fitting manner by means of a rigid spacer grid ( 4 ) or by means of rigid spacer webs ( 5 ) by means of adhesive or a similar connection in such a way that the space between the walls is permeable to air or liquid and is suitable as a monitoring space for over- or under-pressurized leak monitoring systems. 5. Upright flat-bottom tank according to claims 1 to 4, characterized in that the edge region ( 7 ) of the double-walled bottom ( 2 ) is stepped in such a way that the tank bottom ( 2 ) can be integrated during the manufacture of the tank cylinder ( 1 ) and at the same time a connection is created between the wall spaces of the bottom or cylinder. 6. Upright flat-bottom tank according to claims 1 to 5, characterized in that the spacer grids ( 4 ) or spacer webs ( 5 ) are designed to be translucent. 7. Upright flat-bottom tank according to claims 1 to 6, characterized in that it can be manufactured entirely from metallic materials as well as from non-transparent or transparent non-metallic materials.