Chemical Engineering August 2018 - 46

new circumstances, but with an easy
change of rotational speed or impeller
system (type, diameter, location or number
of impellers), the agitator may be
successfully used in the new process.
If modifications are made, detailed record
keeping again becomes important
for continued trouble-free operation.
Knowledge of changes to the agitator
should be incorporated into the maintenance
strategy and need to be known
if troubleshooting poor performance
becomes necessary.
If an agitator is decommissioned
FIGURE 9. Careful record keeping and
parts inventory are recommended during
agitator storage (See Table 5)
repurposed in a new application. The
preceding discussion tacitly focused on
new agitators, but the considerations
are much the same when an existing
agitator is used for a new purpose.
However, there are a few additional issues
that should be considered in this
instance. Good record keeping is of
particular importance in this regard so
the agitator can be properly evaluated
for both its process and mechanical
suitability for the new application. Once
the pertinent parameters of the new
process are known, contact the agitator
manufacturer or their local representative
and ask if the agitator should
be used in the new application. Rarely
will the agitator be optimized for the
from one application and then repurposed
in a different one, storage
is most likely required (Figure 9). As
mentioned in the preceding section,
spare agitators and parts must also be
stored, and even new agitators require
short-term storage if not installed upon
receipt. Proper storage is required for
an agitator to perform up to expectations
when recommissioned. Table
5 lists some key considerations for
agitator storage.
From design to installation to provision
and storage of spares, many
considerations are critical for ensuring
agitators reach their full performance
potential. Reliable and effective agitator
operation starts during the design
process, before the agitator even exists,
and is followed by proper installation,
commissioning and maintenance
throughout the agitator's lifetime that
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Chemical Engineering August 2018

Table of Contents for the Digital Edition of Chemical Engineering August 2018
