DE8814250U1 - Leak testing device for barrels - Google Patents

Description

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Leak testing device for barrels

The tightness of metal drums, especially bung drums, is checked by directing compressed air into the drum interior. Leaks can be detected either by a drop in pressure or by the formation of bubbles in a soapy water film sprayed onto the drum casing. When testing by measuring the drop in pressure, it is not possible to determine which part of the drum is leaking. In most cases, only the bung plugs are disturbed in their sealing seat, while the drum itself is perfect.

During the pressure testing procedure, the bung plugs must be opened in order to insert the pressure lines. It is not possible to check the bung plug seal.

To avoid these disadvantages, it is proposed that a bell housing the ace be detachably connected with its open underside in an airtight manner to a bracket supporting the barrel, whereby pressure seals are clamped between the outer edges of the barrel and the inner surfaces of the bell head and the bracket facing them, forming three inner chambers that are hermetically sealed against one another between the inner wall surfaces of the bell and bracket and the outer surface of the barrel, and that separate suction lines are led out of the chambers.

This 3-chamber device has the advantage that the barrel's longitudinal casing and the top and bottom surfaces of the barrel can be checked independently of one another. When checking the top side, the bungs located in it are also checked at the same time, because the bungs remain closed with the original plugs. This is the only way to ensure that the bungs are properly sealed.

This has the advantage that the vacuum around the chamber can be carried out much more quickly than is possible with compressed air testing. Before the latter can be
compressed air enclosed in the barrel s &ngr;-1 umc.i calms down,
distributes time at the specified test rate, d ·: which then has to be made up again during the test process itself. This in turn leads to a reduction in the test quality.

With the new device it is also possible to generate different negative pressures in the separate chambers.

The drawing shows a schematic embodiment of the innovation.

Fig. 1 shows the device in longitudinal section.

On the bracket 2 carrying the barrel 5 to be tested
the bell 1 holding the barrel 5 is put over and is supported by the seal 17 airtight against
the console 2.

Between the inner head surface of the bell 1 and the
associated barrel head fold are the seal 3 and
between the barrel bottom seam and the end face of the
The seal 4 is clamped into the bracket 2.

In this way, three hermetically separated inner chambers 6,7,8 are created. The inner chamber 6

is through the inner surface of the bell 1 and dsr _t
The head and bottom chambers 7 and 8 are defined by the respective head and lid recesses and the bell head surface and
Seals 3 and 4 adjacent to the console end face
which can also be designed as ring seals.

In the latter case, the free fields / tables form the corresponding boundary areas of the rings.

The head chamber 8 is connected to the suction pump 14 via the suction line 13 leading to the outside , the jacket chamber 6 is connected to the suction pump 15 via the suction line 9 and the bottom chamber 7 is connected to the suction pump 16 via the suction line 12.

The bung openings 10 and 11 remain tightly closed with the original bung plugs during the test procedure. Any pressure drops can be read off on the corresponding pressure gauges in the suction lines.

Claims (1)

CLAIM FOR PROTECTION 1.) Leak testing device for sheet metal drums, characterized in that a bell (1) receiving the drum (5) is detachably connected in an airtight manner with its open underside to a bracket (2) supporting the drum (5), whereby pressure seals (3,4) are clamped between the outer edges of the fold of the drum (5) and the inner surfaces of the bell head and the bracket (2) facing them, forming three inner chambers (6,7,8) which are hermetically sealed against one another between the inner wall surfaces of the bell (1) and bracket (2) and the outer surface of the drum (5), and that separate suction lines (9,12,13) are led outwards from the chambers (6,7,8).