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3. General information
3.1
Safety
All work should be undertaken in compliance with the relevant accident prevention regulations according
to BGV C22. A second person is required for safety reasons, particularly when inspecting tanks.
In addition, the applicable regulations and standards must be respected during installation, assembly,
maintenance, repairs etc. Relevant information can be found in the corresponding sections of these in-
structions.
The tank cover must always be kept closed, except during work inside the tank, otherwise the risk of ac-
cidents is high. The rain guard fitted upon delivery is only transport packaging, is not suitable for pedestri-
an loading and is not childproof. After delivery, it must be immediately replaced with a suitable cover (tel-
escopic dome shaft with appropriate cover)!
Only original GRAF covers, or covers approved by GRAF in writing, are to be used.
GRAF provides an extensive range of accessories, which are all coordinated and can be combined to
form complete systems. Using accessory parts not approved by GRAF will render the warranty/guarantee
null and void.
3.2
Aeration and ventilation
The tank must be ventilated. Additional ventilation ducts or openings should be arranged if required. The
ventilation ducts should be arranged so that natural ventilation is possible (chimney effect). Ventilation via
the air compressor is normally not sufficient.
In unfavourable conditions, the ventilation performance can also be improved by the additional use of
electric pipe aerators.
Ventilation with unobstructed outflow
3. General information
Ventilation in case of infiltration or obstructed outflow
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