Leister VACUUM BOX Manual Del Usuario página 17

Testing using a VACUUM BELL with VACUUM PUMP
• The welding area must be dry and free of contamination. Dirt particles may compromise the test.
• The welding area to be tested is to be lubricated or sprayed with a liquid which forms bubbles (such as soapsuds)
directly before the test. (This is to ensure that the liquid has no unacceptable effects on the seam and the welding
material).
• Close the lever. (Fig. P)
• Position the VACUUM BELL (2) at the point to be tested.
• Place the VACUUM BELL (2) and then push down on it so that the seam to be tested lies at the approximate cen-
ter of the VACUUM BELL (2) (Fig. R). For extended test sections, the VACUUM BELL (2) needs to be repositioned
accordingly. When moving the VACUUM BELL (2), make sure it overlaps the testing areas by around 10 cm. To
enable a negative pressure to be generated, the VACUUM BELL (2) must be pressed down onto the testing area
using both handles (4). (Fig. S)
The negative pressure is displayed on the manometer (6). The negative pressure should never
exceed 0.5 bar; disregarding this may cause an implosion.
• Check the weld seam for leaks.
• The seam is regarded as being tight when negative pressure remains constant for the duration of the test and
does not cause bubbles to form in the seam.
• Relieve the negative pressure by opening the lever. (Fig. T)
• Mark and repair any areas that are not tight.
Fig. P Fig. T
CLOSED
Fig. R
End of the tests
Danger of fire and explosion.
Do not store any flammable materials in the box of the VACUUM PUMP. Allow the
VACUUM PUMP to cool down before putting it into storage.
Once testing has finished, disconnect the power supply cord from the electricity
supply.
• Remove the hose (7) from the VACUUM PUMP (1) and VACUUM BELL (2) and place it in the case (3).
• Close the case (3).
OPEN
Fig. S
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