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5.3 Check points at Intermediate Service
5 Service Instructions
54
5.3.3
Cracks
Cracks can initiate on the machine after a period
of operation and propagate with time.
•
Cracks often initiate in areas exposed to high
cyclic material stresses. These cracks are
called fatigue cracks.
•
Cracks can also initiate due to corrosion in an
aggressive environment.
•
Although very unlikely, cracks may also occur
due to the low temperature embrittlement of
certain materials.
The combination of an aggressive environment
and cyclic stresses will speed-up the formation of
cracks. Keeping the machine and its parts clean
and free from deposits will help to prevent
corrosion attacks.
It is particularly important to inspect for cracks in
rotating parts.
Always contact your Alfa Laval representative if
you suspect that the largest depth of the damage
exceeds 1,0 mm. Do not continue to use the
separator until it has been inspected and cleared
for operation by Alfa Laval.
DANGER
Disintegration hazard
All forms of cracks are potentially dangerous
as they reduce the strength and functional
ability of components.
Always replace a part if cracks are present.
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