DE1165946B - Double-walled storage container for liquids or gases with inner plastic bladder and leak indicator - Google Patents

Description

Double-walled storage container for liquids or gases with inner Plastic Bladder and Leak Indicator The invention relates to a double-walled storage container for liquids or gases, consisting of a rigid Outer jacket and one inserted into the outer jacket, roughly adapted to its inner shape Plastic bladder, and a device for monitoring the tightness of the plastic bladder.

Known devices for preventing leakage losses on storage containers are based either on the fact that the outflowing medium outside the container a Alarm device triggers, or that by the decreasing volume of the medium in the container the alarm is triggered, or on the fact that the container, which also can be made of a plastic, in a second container, for. Legs Protective trough for liquids is introduced.

These devices or arrangements have the disadvantage that they do not completely prevent leakage. They only take effect when part of the Medium has flowed out.

There are also double-shell metal containers for storing stored goods known, in which a control liquid is introduced into the space between the pans will. The disadvantage of this arrangement is the risk of contamination of the stored goods with control liquid in the event of a leak in the inner shell, the poor repair possibility and the impossibility of retrofitting a single-walled underground tank into a double-walled.

Finally, a storage container is known in which an existing one Metal container introduced a safety bubble made of plastic or similar material is, the plastic bladder by spacers at a small distance from the Metal container is held. A sniffer pipeline at the deepest point of the Metal container is used to detect leaked stored goods. The disadvantage This arrangement is that the plastic bladder has a relatively large wall thickness must have so that they do not adhere to the metal container in spite of the spacers applies. With this arrangement, too, a leak can only be determined when leakage fluid occurs has passed through the plastic bladder.

The invention is based on the object even before it occurs to give an alarm of leakage losses and to prevent the contents of the container from leaking out. The device should also be built into existing containers at a later date can.

This is done according to the invention in the case of the storage container defined at the outset achieved in that the plastic bladder itself is double-walled and the space between the inner wall and the outer wall of the bladder running all over Circumference at intervals are punctiformly connected to each other, in known per se Way under a pressure exceeding the highest static pressure of the tank contents Gas pressure, which is indicated by a pressure gauge.

To avoid leaks in the connection line between the plastic bladder and to exclude the pressure gauge as far as possible, it is further proposed according to the invention, that from the double-walled bladder to the manometer a flexible cord with a filler neck provided plastic line leads, which in a balloon-shaped elastic membrane ends, the membrane sealing in a manner known per se in a to the manometer connected, filled with a liquid transfer vessel is used.

The following is an embodiment of the invention by reference described in more detail on the schematic drawing: In a rigid outer containerB The usual design is a double-walled plastic bladder 1, which is about has the size of the interior of the container.

The outer container can already be in the ground and used; in this case, however, it must be cleaned before the introduction of the bladder. Attached is the plastic bubble on the dome of the container through a plastic flange 2. This The flange is like a seal between the dome flange 3 of the container and the dome cover 4 inserted and tightened with the cover screws. The inner and outer shell the double-walled bladder is welded to the plastic flange 2 so that the gap is completely airtight between the inner and outer shell. the both shells are connected to one another by spot welding at intervals in such a way that that when the space is inflated, quilt-like rhombuses are created. Only through a hole 5 in the plastic flange, in which a flexible Plastic line 6 is welded in, a connection to the wall space made of the double-walled bladder.

If the space between the pans is inflated through this plastic pipe, so the double-shelled bladder straightens up and lies on the inner wall of the outer container at. The diamond pattern is created by spot welding at the corners of the rhombuses, this allows the gas used for inflation to enter all the rhombuses of the double-walled bladder and fill the entire space between the bowls.

The plastic line 6 leads to a manometer 7 Manometer inclusion no leaks can occur, the plastic line ends in a balloon-shaped membrane 8 which lies in a transfer vessel 9. This and the screwed-on manometer are filled with water, which increases the pressure in the Transfer the space between the wall of the bladder 1 to the pressure gauge 7 via the plastic line 6 will. If the container is not filled, the space between the wall of the bladder is covered by a Filler neck 11 brought to an air pressure of about 0.5 atü and then the filler neck 11 tightly welded. If a liquid to be stored, e.g. B.

Heating oil 12 filled into the container, the pressure continues to rise what can be used as a container content display at the same time.

The mode of operation of the device described is as follows: Will for some reason one of the two plastic shells of the bladder is damaged and leaks, then the pressure in the space between the walls of the bladder drops below 0.5 atü. This The range from 0 to 0.5 atm is shown on the pressure gauge scale. B. executed red, for good Identification of leakage.

The pressure equalization in the space between the bladder and the rigid Outer jacket takes place either over the normal container ventilation pipe or over a pressure equalization line 13, which through the dome cover and the plastic flange in the middle between the outer bladder shell and the inner wall of the container leads.

Claims (2)

Claims: 1. Double-walled storage container for liquids or gases consisting of a rigid outer jacket and one in the outer jacket inserted, about its inner shape adapted plastic lens, as well as from a device for monitoring the tightness of the plastic bladder, characterized in that the plastic bladder (1) itself is double-walled and the space between the inner wall and the outer wall of the bladder, which are punctiform around the circumference at small intervals are connected with each other, in a manner known per se, under one of the highest static pressure of the container contents (12) is excessive gas pressure through a manometer (7) is displayed. 2. Storage container according to claim 1, characterized in that of the double-walled bladder (1) to the manometer (7) is a flexible one with a filler neck (11) provided plastic line (6) leads, which in a balloon-shaped elastic Membrane (8) ends, the membrane sealingly in a manner known per se Transfer vessel connected to the manometer and filled with a liquid (9) (10) is inserted. ~~~~ Publications taken into consideration: German utility models No. 1,810,278, 1,820,098; Austrian Patent No. 208 774; french U.S. Patent No. 618,359; British Patent No. 264,873; U.S. Patents No. 1 886 074, 1 954 581, 2877799.