Medium-consistency pump MC
STANDARD, C-01-000000
Rev. 0, 2010.02.09 SAFETY Kap.2 , Seite 18 of 20
GRZ-2698567-v1-Safety.FM
Ventilation –
protective
breathing
equipment
The ventilation system must be sized such as to maintain the
concentration of noxious substances below the maximum concentration
permitted in the work place and also to ensure that sufficient oxygen is
available. This will ensure that it is possible to work without protective
breathing equipment and that there is no risk of fire or explosion.
Ventilation is only permitted with air. It is forbidden to ventilate using pure
oxygen or air with an increased oxygen content!
If the concentration of noxious substances exceeds the maximum
permitted values, suitable protective breathing equipment must be used.
Rules for ventilation
• Solvent vapours are heavier than air, thus they must be extracted by
suction at the lowest point of the vessel.
• Fresh air should be blown in close to the respiratory organs.
• Ventilating efficiency should be monitored with measuring instruments.
• If substances presenting a fire hazard are extracted, the risk of
explosion must be considered.
Protective breathing equipment
Oxygen content Harmful substance
concentration
Safety measures
> 17% < MAC at place of
work
None
> 17% > MAC at place of
work
< Retaining capacity
Filter mask
> 17% > MAC at place of
work
> Retaining capacity
Independent
protective breathing
equipment
< 17% Independent
protective breathing
equipment
> 50% of lower
explosion limit
Entry is forbidden
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