DE2329525A1 - Double skinned heating oil tank with leak indicator - has detector in base of perforated annular profiled section between skins - Google Patents

Abstract

A hollow profiled section is mounted in the annular chamber between inner and outer skins, extending from the tank to the base and back to the top again, thus forming a U-shaped annular chamber joining the outer skin via two openings. The annular chamber is connected to that between the skins at the base, and at this point it contains an interchangeable leak detector, connected via a measuring cable to an alarm device outside the tank. The profiled section can be a tube, perforated where the detector is mounted, and it can fit in a groove formed in the outer tank skin. Where the inner and outer skins are of glass-fibre-reinforced plastic separated by a sheet of material, the profiled section can be mounted between the sheet and the inner skin.

Description

MANNESMANN AG, Düsseldorf

"Double-walled storage container with a leak indicator"

The invention relates to a double-walled storage container for heating oil or the like, in which a leak indicator device is provided for monitoring the jacket space between the rigid inner container and the rigid outer container.

For the monitoring of double-walled storage containers are currently essentially three different systems known. Storage containers, consisting of a rigid outer container and a flexible inner shell made of plastic, are currently mostly used provided with vacumetric leakage indicators, which one in the jacket space monitor generated negative pressure. This vacumetric leak indicator is also for dcppelwandige storage containers applicable, which have both a rigid inner container such as also have a darren outer container. Next to it is a storage container for liquid fuels, consisting of a rigid outer container and an elastic one Inner container made of flexible material is known, in which a Pipe led to the bottom of the container and placed a probe in this pipe which responds to leakage fluid (DF-Gbrn 1 911 974). Exclusively for the Generic storage containers, the third type of monitoring is in Perm a leak indicator that works with a control fluid in the shell space (DT-AS 1 200 619).

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The invention is particularly concerned with double-walled leak protection Storage container and assumes that it is known, in the jacket space, a thin steel tube formed in the order of magnitude of a measuring line up to the bottom of the container (DT-OS 1 775 044).

Since with one and the same leak detection system, the costs for the leak detection device are essentially independent of the size of the storage container that However, the costs of the individual systems vary from one another, in particular for double-walled storage containers with a rigid inner container and a rigid outer container the need for a free choice of leak detection system, so that such a double-walled storage container should be designed such that both for example a vacumetric leak indicator and a leak indicator provided with a leak sensor arranged in the shell space at its lowest point can be. This is an object of the invention which further consists in to design the double-walled storage container in such a way that a leak sensor arranged in the shell space can also be replaced if necessary.

According to the invention it is therefore proposed that a hollow profile from the mantle space Container vertex area starting at the container base and back again to the boa'ter vertex is relocated, so that an approximately U-shaped or O -shaped annular chamber is formed is, which merges into two passage openings of the outer container, that the annular chamber in the sole area with the jacket space and that in the Rir.gkammer In the area of the bottom of the container, a leakage sensor responsive to leakage fluid can be inserted replaceably and via a measuring cable to an outside dos container arranged alarm device can be connected.

The leakage sensor can be either a PTC thermistor or one in the annular chamber laid perforated plastic hose line in the sole area, which on the one hand connects to the suction line of a vacuum pump on the other hand to the pressure cell of a vacumetrisehen leak detector is connected, in which case the Annular space between the passage openings and the plastic hose line must be sealed vacuum-tight. However, this is one that is familiar to the person skilled in the art natural measure. However, the use of a leak sensor is preferred, For example, the PTC thermistor mentioned, because this version for the

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generic storage container is particularly inexpensive.

Further refinements of the invention, in particular also with regard to the training of the hollow profile, which is an open hollow profile (half tube) or a closed Hollow profile (pipe) came to be, are set out in the subclaims.

The use of the invention for securing double-walled is particularly advantageous Storage containers made from glass fiber reinforced plastic. Derirtige double-walled GRP containers point around the shell space between the already finished inner container and the outer container to be wound on it to be able to produce a raised release film on the front the winding of the outer container is applied to the inner container. The coat room then lies between the separating film and the inner container. Here it is appropriate a further development of the invention provided to arrange the hollow profile between the inner container and the separating film to ensure that when Wrap the outer container, the perforation of the hollow profile is not closed.

The invention is illustrated in the accompanying figures on the basis of exemplary embodiments explained:

It shows:

Figure 1 is a side view of the storage container according to the invention, partially in section

FIG. 2 shows a cross section through a storage container designed according to FIG

FIG. 3 shows an enlarged section from the sole area of a storage container

Figure 4

and 5 open hollow profiles arranged in the jacket space

FIG. 6 shows the arrangement of the leak indicator in the area of the container bottom

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FIG. 7 is a partial view from FIG. 6

The storage container shown in Figure 1 consists of a rigid inner container and a rigid outer container 2. Between the inner container 1 and the outer container 2 is a shell space 3. The one necessary to form the shell space 3 The distance between the inner container 1 and the outer container 2 is via dome-shaped elevations 16 secured on the inner wall of the outer container 2. In the coat room

ever

3, a hollow profile 5 is arranged in the form of a tube, which, as shown in FIG I see, starting from the top of the container to the bottom of the container and again is moved back to the top of the container, so that an approximately U- or O-shaped annular chamber 23 (see FIG. 3) is formed, which merges into two passage openings 13, 14 of the outer container 2. In the sole area, the annular chamber 23 is above perforations 15 with the jacket space 3 connected. In the annular chamber 23 is in the area of A leak sensor 9 responsive to leakage fluid is provided interchangeably on the container base and is connected via a measuring cable 6 to an outside of the container Afarmeinrichtung 7 connected. The alarm device 7, which is not shown The horn, a warning lamp for an optical signal and a lamp for indicating readiness for operation is fed by a power source 8. However, the leak sensor 9 is not only connected to the measuring cable 6 but also to a tension element 10 connected, with the help of which, according to an earlier proposal by the applicant (patent application P 23 11 953.1), the leakage sensor 9 quickly and can be safely drawn into the hollow profile 5 or pulled out of the tube. The tension element 10 is of course designed to be correspondingly long, and here wound up on a roll 12 which is secured by a holding device 11 is.

Figure 3 is a section of a double-walled storage container made of glass fiber reinforced Plastic, in which between the container 1 and the outer container 2, a Trermfilm 1ß is arranged. In the embodiment shown in FIG are on both sides of the hollow profile 5 along the container sole additional spacers 17 laid in the form of round plastic rods in cross section. These artificial sticks 17 expand the jacket space in the sole area slightly, so that ensured is that leakage fluid flows particularly quickly along these rods Hollow profile 5 can move without first having to look for a way between the spacers.

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In the production of the GRP containers designed according to the invention, first the inner container produced.and after this is largely cured, the hollow profile 5 in the form of a tube or a hollow profile 20 in the form of a Half pipe or a hollow profile 21 applied in the form of a U-profile. Included it doesn't hurt if the surface of the inner container 1 is still a bit sticky, because as a result, the position of the hollow profile 5, 20, 21 is additionally secured. Now, after the release film 18 has been applied, the outer container 2 is wrapped, with the hollow profile 5, 20, ″ 21 creates a groove-shaped bulge 19 in the outer container and an annular bead 24 on the outside.

While the embodiment according to FIGS. 1 and 2 is preferred for underground GRP storage containers, an embodiment according to FIGS. 6 and 7 can be used for an above-ground storage container or in other specially stored cases, in which the hollow profile 5 is laid in the container bottom. In this fairness, a closed hollow profile 5 (tube) is preferred, the two ends of which> i 5 'and 5 ¹ ' emerge from corresponding passage openings 13, 14 of the outer container 2.

The great advantage of the invention is that in particular double-walled Storage container made of glass fiber reinforced plastic in a simple manner on the installation a later leak indicator device can be prepared. In the case of the embodiment according to FIGS. 6 and 7, for example, but also according to FIGS. 1 and 2, where the closed hollow profile is tightly embedded in the passage openings, could even be connected directly to the hollow profile both the suction line of a vacuum pump and the measuring line of a vacumetri see leak detector.

- patent claims -

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Claims (8)

Case 8991 PATENT CLAIMS Double-walled storage container for heating oil or the like, in which to monitor a leak indicator device is provided in the jacket space between the rigid inner container and the rigid outer container, characterized, that in the shell space (3) a hollow profile (4,20,21) is laid from the container apex area starting to the container base and back to the container apex, so that an approximately U- or O-shaped annular chamber (23) is formed , which is in two openings (13,14) of the outer container (2) passes over, that the annular chamber (23) in the sole area is connected to the shell space (3) and that an exchangeable leakage sensor (9) responsive to leakage fluid is provided in the annular chamber (23) in the area of the container sole and is connected via a measuring cable (6) to an alarm device (7) arranged outside the container. 2. Storage container according to claim 1, characterized in that the hollow profile (5) is a tube perforated in the area of the container bottom. 3. Storage container according to claim 1, characterized in that the hollow profile (20,21) is an open hollow profile. 4. Storage container according to one of claims 1 to 3, characterized in that from the first passage opening (13) a groove-shaped bulge (19) in the outer container (2) leads to the bottom of the container and back to the second passage opening (14) and the hollow profile (5, 20, 21) is arranged in this bulge (19). 5. Storage container according to claim 4, characterized in that the bulge (19) arranged in the region of the container dome (4) transversely to the longitudinal axis of the container is and the openings are inside the mandrel shaft. 409881/0180 6. Storage container according to one of claims 1 to 5, in which the inner and outer containers made of glass fiber reinforced plastic and a separating foil is provided between the outer container and the inner container, characterized in that that the hollow profile (5, 20, 21) is arranged between the inner container (1) and the separating film (18). 7. Storage container according to claims 4,5 and 6, characterized in that the Groove-shaped bulge when angling the GRP outer container (2) around the the inner container is formed by a hollow profile and the outer container (2) thereby having an externally honorable annular bead (24). 8. Storage container according to one of claims 1 to 7, characterized in that an additional spacer (17) is laid along the bottom of the container. 409881/0180