Conditioning and mixing of harvest yeast in storage tanks
obtaining a homogeneous slurry with uniform temperature
and consistency. Optional facility to aerate or acid wash
through propeller nozzles. The mixer is designed for mixing
yeast slurry with a wet solids content of 25-50 vol/vol%.
The mixer comprises gear motor, combined gear console/CIP
entry, CIP pipe with spray ball penetrated by the hollow mixer
shaft ending in propellers with CIP nozzles.
For shaft lengths above 1.5 meters a sanitary tripod support
is welded into the tank bottom. This support is fully cleaned
by the bottom CIP facility. For larger tanks more propellers
are used to ensure correct homogenisation.
During cleaning there are no CIP shadow areas caused by
the propeller shaft or propeller blades as these parts are integrated
in the cleaning.
Stainless steel AISI 316 (standard).
All other parts in contact with product
are FDA approved.
propeller speed: 70 - 75 rpm
(or acc. to customer specification)
Power supply: 400 V, 50 Hz (standard)
Motor size: 2.2 or 3 kW
CIP supply: Capacity and inlet pressure:
For mixers with aeration facility:
18-20 m3 at 3-3.5 bar (51 psi)
For mixers without aeration facility:
18-20 m3 at 2 bar (29 psi)
For low viscous yeast optimal mixing efficiency is obtained by
interval agitation. In order to minimize damage of the yeast
cells, the agitation should normally be restricted to the
cooling down period and prior to pitching. During storage
agitation is only needed once in a while to keep the suspension
If equipped with the optional aeration valve, it is possible to
aerate through the CIP nozzles when agitating. Due to the
efficient agitation, this facility may also be employed for pH
lowering of the yeast suspension through acid washing.
Please observe that the mixer must never run dry i.e. without
yeast or CIP liquid.