Safety
10
Grinding machine SMD 123 RE
If carcinogenic substances are released during grinding (e.g. with stainless steel), the exhaust
system must be operated with an absolute filter.
The machine must be connected to a dust extraction system with wet extraction when
grinding aluminium.
Follow the operating manual of the exhaust system!
All federal requirements for extraction systems for potentially explosive steel dusts must be
met.
It must be guaranteed that the continued operation of machine is impossible if the dust
extraction system fails.
The volume flow rate of the dust extraction system must be at least 3000 m³/hr.
The flow velocity must be at least 20 m/sec.
No dust deposits should form in the extraction pipes.
2.7.3
Fire hazard
Do not process any workpieces which have been treated with a flammable corrosion resistant
agent or flammable additive.
Do not operate the machine near easily flammable materials.
Make sure that the machine is always cleaned of machining residues according to the
operating manual.
2.7.4
Explosion hazard
2.7.4.1
Description of explosion hazard
The machining of aluminium produces flammable dust by grinding that, when mixed with air, can
form a potentially explosive atmosphere. This also applies to the machining of steel and stainless
steel.
During machining of aluminium, wet separators must always be used.
A mixture of steel and aluminium dust can produce an explosive gas during corrosion
Moreover, there is always the possibility that contact between water (e.g. air humidity) and
aluminium dust can produce hydrogen gas, resulting in a gas explosions.
2.7.4.2
Division of zones
The extraction of the aluminium or steel dust with a suitable extraction system (see Section 2.7.2)
and performing the cleaning intervals (see Section 7.4) prevents the formation of an explosive
atmosphere within the machine or in the suction pipes.
Only if this is ensured may the machine be operated.
