Operating Manual for
Bauer Separator Compact
29
Fig. 13-14 Measuring of the working gap between the screen and the auger;
the gap is measured on the bottom side of the screen while the machine is at
rest. The measurement yields two times the working width because the screen
rests on the top of the auger when the machine is nut running.
13.5 EVALUATION CRITERIA FOR THE AUGER AND SCREEN WITH REGARD TO WEAR
AND RECOATING
All moving parts on the separator are subject to some amount of wear. Some of the parts that are di-
rectly subject to wear and must therefore be inspected regularly have already been described. Good
regular inspections and maintenance of the wearing parts will significantly lengthen the service life of
the parts. Worn parts should be replaced as quickly as possible in order to avoid the damage that
might otherwise result.
The parts that directly influence the operation of the separator are the screen and the auger. Inde-
pendent of this, the
“
normal
”
operating condition of the separator is also influenced by parameters oth-
er than wear.
In principle, only the auger can be recoated to be used again; the screen cannot be recoated.
In order to ensure the necessary quality and precision, the recoating of the auger may only be per-
formed by a workshop authorized by BAUER.
WARNING
Never hire another shop to recoat the auger for you since incorrect performance
and failure to observe the necessary tolerances could destroy the screen and void
all warranty claims (see Fig. 13-8 Screen wear).
The normal wear of the screen can be observed as an increase in the inner diameter and the screen
gap width. The wear of the screen and the auger generally affects the proper functioning of the sepa-
rator and can be identified based on reduced throughput and worse drainage of the liquid phase. How-
ever, when observing such changes, it must also be ruled out that the supply medium and its con-
sistency have changed.
Wearing of the screen or of the auger on
the outer edges of the blade changes the
working gap. In new condition, the working
gap and therefore the radial gap between
the screen and the auger (initial gap width)
is approx. 0.2 - 0.4 mm; this can be meas-
ured with a thickness gage (Fig. 13-14).
If the radial gap between the screen and
the auger becomes twice the initial gap
width or larger, this influences not only the
operating condition but also poses the risk
that the screen could be damaged or even
split. If the radial gap between the screen
and the auger is still larger than two times
the original gap width even after replacing
the screen, the auger must be recoated.
The most important criterion for the wear of the screen and the auger is however the operating condi-
tion of the machine; in other words, if the result no longer satisfies the requirements (throughput, liquid
phase, etc.), the screen must be replaced and/or the auger recoated
Additional indications for the need to recoat the auger can be found in the appearance of the plating
material as shown below in Fig. 13-15.
In principle, the auger should be recoated before the plating has been removed by wear, uncovering
the base material of the auger. Otherwise, the wear on the auger will increase severely enough that it
can no longer be recoated at reasonable expense.