Alfa Laval 881176-09-01/1, Instruction Book

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6.5 Interface description 6 Technical references
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6.5.3 Definitions
For the purpose of this document, the following
definitions apply:

Maximum allowed speed: The speed the
separator bowl and other, to the bowl spindle
attached parts, never shall exceed.

Change of separator mode: It is assumed that
the control system has done a reasonable
amount of trials to correct the fault condition
before further steps are initiated.
6.5.4 Goal
To eliminate situations that can cause harm, i.e.
injury, damage to health or property and
unsatisfactory process result are e.g.:
Information and instructions given in this
document aim at preventing these situations.
For this reasons functions that are indispensable
or needed for safety reasons to protect the
machine and/or personnel are denoted with shall
while other functions are denoted with should.
Situation Effect
Failure in control system. Too high stress on bowl which might
cause harm.
Unbalance caused by uneven sediment
accumulation in the bowl. Too high stress on bowl and bearing
system which might cause harm.
Bowl speed exceeding maximum
allowable rotor speed. Too high stress on bowl which might
cause harm.
Insufficient cleaning of centrifuge. Unsatisfactory product quality.
Bowl leakage. Product losses.