22
7.3 Mixer Functioning
Hazard of damages to the mixer and injuries to persons
Follow the instructions indicated in
Chapter 2.
For a correct installation of the propeller, take into account the mixer tilt!
Danger of explosion!
Due to the overheating of the intermediate and lower bearings,
caused by non-lubrication.
Check always the correct oil level in the drive line.
Danger of explosion!
From the digester or the fermented product tank , explosive or flammable gases can
come out!
Smoking or using flame or any other flammable substance is strictly forbidden!
Hazard of damages to the mixer!
Check that nothing could block the propeller!
The propeller has to be enough covered by the product to be mixed!
During the mixing, pay attention to possible unusual noises! (which can be caused by
the non-lubrification, loosened parts, failures regarding the motors, gearbox, bearing or
drive shaft, etc…)
Keep the mixer always free from snow or ice!
Hazard of damages to the mixer!
The presence of foreign bodies such as strings, ropes, plastic tapes can unbalance the
mixing propeller, which consequently can damage the bearings as well as the whole
unit.
These foreign bodies can also damage the mechanical seal.
Rarely, and only in case of fixed installation of the equipment, the material can be
corroded.
Anyway these phenomena are mainly due to stray currents (i.e. potential displacement,
faulty grounding connection) or electrochemical reactions (high acidification of co-
ferment or of biowaste, usually at a temperature higher than +45°C).
