Vetter Lifting bags 1 bar (14.5 psi) - Manual (Page 13)

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6. Repetitive checks
Repetitive checks are to be made on lifting bag systems as follows:
9 Testing during acceptance
Check to ensure that all items are present and complete; this
is made by the person commissioned for the task.
A visual and function test is to be made by an instructed per-
son according to the operating instructions.
9 A visual and function test is to be made after each period of
use / application and carried out by the user.
This test is to be documented.
9 The lifting bag system is to undergo a visual test and function
test at least once each year by a specialist (*) and is to be made
according to the check list (available on request).
This test is to be documented.
(*) Qualification see premilinary remarks on GUV G 9102
9 At least every 5 years, or if there is any doubt about the safety
or reliability, the lifting bag system is to be tested according
to GUV-G 9102 (formally GUV 67.13) by the manufacturer.
The responsibility for the correct and professional execution of
the repetitive test lies with the user!