Leak Testing - Vacuum Boxes - Kowotest Vacuum Leak Testing Boxes

Overview

Kowotest vacuum boxes use highly limpid, flexible plastics for the break-proof inspection pane. For good sealing on nearly all surfaces the pane is edged with a highly flexible gasket of a special soft rubber mixture. For evacuating the box a 360° rotatable vacuum valve with connection for the Ø 13 mm (½inch) vacuum hose is used. By pressing down the box onto the test piece at the handles – one handle is the vacuum valve – the valve is opened and testing starts.

Vacuum Boxes

For Butt Weld Seams
180° (Tank Floor)

Inspection pane 75 x (length - 50) mm
Total 120 x length x 30 mm
Inside 20 mm height
Rubber gasket 20 x 30 mm

For Lap Fillet Weld Seams
180° (Tank Floor)

Inspection pane 75 x (length - 50) mm
Total 120 x length x 30 mm
Inside 20 mm height
Rubber gasket 20 x 30 mm

For Butt Weld Seams
180° Outside (Tubes, Tanks)

Inspection pane 75 x (length - 50) mm
Total 120 x length x 30 mm
Inside 20 mm height
Rubber gasket 20 x 30 mm

For Fillet Weld Seams
90°/270° (Edges/Corners)

Inspection pane 70 x (length - 50) mm
Total 130 x length x 30 mm
Inside 20 mm height
Rubber gasket 25 x 35 mm

For Round Fillet Weld Seams
90° Inside (Tank Floor/Wall)

Inspection pane 75 x (length - 50) mm
Total 120 x length x 30 mm
Inside 20 mm height
Rubber gasket 20 x 30 mm

For Special Testing Purposes

Inspection pane Ø - 40 mm
Total Ø x 30 mm
Inside 20 mm height
Rubber gasket 20 x 35 mm

Models / Lengths Available

Models for Testing Butt Weld Seams - 180° (i.e. Tank Floor)

Model	Part Number
Vacuum Box MINI, butt weld seam, length 200 mm (8 in)	60 70397
Vacuum Box MINI, butt weld seam, length 300 mm (12 in)	60 70398
Vacuum Box MINI, butt weld seam, length 400 mm (16 in)	60 70399
Vacuum Box, butt weld seam, length 500 mm (20 in)	60 70401
Vacuum Box, butt weld seam, length 600 mm (24 in)	60 70400
Vacuum Box, butt weld seam, length 750 mm (30 in)	60 70402

Models for Testing Lap Fillet Weld Seams - 180° (i.e. Tank Floor)

Models	Part Number
Vacuum Box, lap fillet weld seam, step 3 to 9 mm, length 500 mm (20 in)	60 70391
Vacuum Box, lap fillet weld seam, step 3 to 9 mm, length 600 mm (24 in)	60 70393
Vacuum Box, lap fillet weld seam, step 3 to 9 mm, length 750 mm (30 in)	60 70394
Vacuum Box, lap fillet weld seam, step 5 to 11 mm, length 500 mm (20 in)	60 70387
Vacuum Box, lap fillet weld seam, step 5 to 11 mm, length 600 mm (24 in)	60 70388
Vacuum Box, lap fillet weld seam, step 5 to 11 mm, length 750 mm (30 in)	60 70389
Vacuum Box, lap fillet weld seam, step 7 to 13 mm, length 500 mm (20 in)	60 70419
Vacuum Box, lap fillet weld seam, step 7 to 13 mm, length 600 mm (24 in)	60 70421
Vacuum Box, lap fillet weld seam, step 7 to 13 mm, length 750 mm (30 in)	60 70420

Models for Testing Butt Weld Seams - 180° Outside (i.e. Tubes, Tanks)

Models	Part Number
Vacuum Box MINI, round butt weld seam, Ø 5, length 100 mm ( 4 in)	60 70503
Vacuum Box MINI, round butt weld seam, Ø 32, length 110 mm ( 4 in)	60 70504
Vacuum Box MINI, round butt weld seam, Ø 40, length 120 mm ( 5 in)	60 70505
Vacuum Box MINI, round butt weld seam, Ø 50, length 135 mm ( 5 in)	60 70506
Vacuum Box MINI, round butt weld seam, Ø 65, length 150 mm ( 6 in)	60 70507
Vacuum Box MINI, round butt weld seam, Ø 80, length 170 mm ( 7 in)	60 70508
Vacuum Box MINI, round butt weld seam, Ø 100, length 195 mm ( 8 in)	60 70509
Vacuum Box, round butt weld seam, Ø 125, length 220 mm ( 9 in)	60 70510
Vacuum Box, round butt weld seam, Ø 150, length 260 mm (10 in)	60 70511
Vacuum Box, round butt weld seam, Ø 200, length 370 mm (15 in)	60 70512
Vacuum Box, round butt weld seam, Ø 250, length 400 mm (16 in)	60 70513
Vacuum Box, round butt weld seam, Ø 300, length 440 mm (17 in)	60 70514
Vacuum Box, round butt weld seam, Ø 350, length 460 mm (18 in)	60 70515
Vacuum Box, round butt weld seam, Ø 400, length 500 mm (20 in)	60 70516
Vacuum Box, round butt weld seam, Ø 500, length 570 mm (23 in)	60 70517
Vacuum Box, round butt weld seam, Ø 600, length 650 mm (26 in)	60 70518
Vacuum Box, round butt weld seam, Ø 700, length 740 mm (29 in)	60 70519
Vacuum Box, round butt weld seam, Ø 800, length 730 mm (29 in)	60 70520
Vacuum Box, round butt weld seam, Ø 900, length 730 mm (29 in)	60 70521
Vacuum Box, round butt weld seam, Ø 1000, length 730 mm (29 in)	60 70522
Vacuum Box, round butt weld seam, Ø 1100, length 750 mm (30 in)	60 70523
Vacuum Box, round butt weld seam, Ø 1200, length 750 mm (30 in)	60 70524
Vacuum Box, round butt weld seam, out-side, Ø 1300, length 750 mm (30 in)	60 70525

Models for Testing Fillet Weld Seams - 90° / 270° (Edges/Corners)

Models	Part Numbers
Vacuum Box MINI, fillet weld seam, 90°, in-side, length 250 mm (10 in)	60 70426
Vacuum Box, fillet weld seam, 90°, in-side, length 400 mm (16 in)	60 70395
Vacuum Box, fillet weld seam, 90°, in-side, length 500 mm (20 in)	60 70403
Vacuum Box, fillet weld seam, 90°, in-side, length 600 mm (24 in)	60 70396
Vacuum Box, fillet weld seam, 90°, in-side, length 750 mm (30 in)	60 70404
Vacuum Box, fillet weld seam, 270°, out-side, length 500 mm (20 in)	60 70410
Vacuum Box MINI, fillet weld corner, 3 x 90°, in-side, edge length 100 / 60 mm	60 70427
Vacuum Box, fillet weld corner, 3 x 90°, in-side, edge length 300 / 230 mm	60 70408

Models for Testing Round Fillet Weld Seams - 90° Inside (i.e. Tank Floor/Wall)

Models	Part Numbers
DN 2250, Ø 2000 to 2600 mm, length 400 mm (16 in)	60 70428
DN 2800, Ø 2600 to 3200 mm, length 500 mm (20 in)	60 70430
DN 3450, Ø 3100 to 3800 mm, length 500 mm (20 in)	60 70432
DN 4050, Ø 3600 to 4600 mm, length 500 mm (20 in)	60 70435
DN 4900, Ø 4200 to 5800 mm, length 600 mm (24 in)	60 70439
DN 6500, Ø 5400 to 8300 mm, length 600 mm (24 in)	60 70442
DN 8750, Ø 6800 to 12500 mm, length 600 mm (24 in)	60 70445
DN 15000, Ø from 10000 mm, length 700 mm (28 in)	60 70418

Models for Special Testing Purposes - Castings, Highly Flexible for Vaulted Surfaces

Models	Part Numbers
Vacuum Box for castings, Ø 125 mm (5 in)	60 70531
Vacuum Box for castings, Ø 250 mm (10 in)	60 70532
Vacuum Box for castings, Ø 400 mm (16 in)	60 70533
Vacuum Box for castings, 200 x 300 mm ( 8 / 12 in)	60 70534
Vacuum Box for castings, 400 x 400 mm (16 / 16 in)	60 70535
Vacuum Box, high flexible, 100 x 150 mm (4 / 6 in)	60 70539

How to Use

Leaks can be determined with this method easily. Detection limits of this method under practical testing conditions are between 0.0001 and 0.001 mbar l / s.

During testing, a foaming agent is sprayed onto the test area of a welding seam or a casting part. A foaming agent such as the G-FLEX leak finder is suitable – soap water should not be used.
After applying the foaming agent, the test area is covered with a vacuum box fitted to the geometry of the structure. This vacuum box is connected with a vacuum hose to the vacuum pump or ejector with air compressor.
After opening the valve - which is automatically done by pressing the box onto the test area - the volume under the vacuum box is evacuated within a few seconds. If there is a defect within the vacuum box, a foam hat quickly builds up because of the air streaming in through the defect.
For reliable detection of all defects, the vacuum underneath the box must be sustained for at least 30 seconds.

Equipment Needed for Testing

Vacuum Generator - Either vacuum pump or ejector (ejector must be connected to air compressor)
Vacuum Hose - Connection between generator and vacuum box

Vacuum Box - Wide variety available to suit your application
Foaming Agent

Kowovac V Leak Test System

The complete Kowovac V leak testing unit is made to work with Kowotest Vacuum Boxes. Includes vacuum pump with vacuum control valve, vacuum gauge, dust / water separator, splash proof switch and oil-resistant power cable and are all built into a sturdy stainless steel frame. The oil-free (dry running) vacuum pumps are maintenance friendly due to the highly wear resisting special coal the impellers are made with.

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Product Literature

Kowotest-Kowovac-and-Vacuum-Leak-Testing-Boxes-Brochure.pdf