Vetter Pipe sealing bags and bypass bags FS - Manual (Page 5)

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2.2 Information about the dangers
Changes and modifications to the sealing bags, inflation fittings
and inflation hoses are not permitted.
Operation of Vetter pipe sealing- and bypass bags are only per-
mitted with original Vetter inflation fittings and inflation hoses.
Parts made by another manufacturer can influence safety.
Pipe sealing- and bypass bags are made of a strong expanding
material. If this material is expanded beyond its permitted maxi-
mum range then this can cause bursting.
No person is allowed to remain within the working area during
the pressure test. With a water pressure test, the pipeline being te-
sted must not have any direct connection to a high-pressure line
(e.g. hydrant).
After positioning the pipe sealing- and/or bypass bag it is to be
ensured that nobody remain in the channel or in front of the pipe
during inflation, as well as during the test procedure and empty-
ing sequence.
Before removing the set-up make certain that the pipeline is not
under any pressure and is completely empty.
2.3 Warnings
The pipe sealing- and bypass bags as well as the accessories must
be checked for perfect condition before and after each operati-
on.
Outside the pipeline, Vetter pipe sealing- and bypass bags 1.5 bar,
must only be filled to maximum of 0.5 bar.
All controllers are fitted with a safety valve that has a permitted
maximum operating pressure corresponding to the pipe sealing-
and bypass bags.
If the maximum operating pressure of 1.5 bar is exceeded then
the safety valve will activate. The tolerance for opening and clo-
sing of the safety valve is only permitted to be a maximum of +
10%. The set pressure must not be changed.
If the sealing on the top part of the valve is removed then its ope-
ration is no longer guaranteed and the safety valve must be ex-
changed. The permitted inlet pressure on the controller (marking
on the inlet coupling) must not be exceeded.