May - Library

KEY WHAT WHY
Check packing to see if product is leaking out. Since most screw conveyors use dry
packing there won't be any gland water to check.
Be careful of rotating shaft at packing!
Check the screw for bent cracked or otherwise damaged flights. Listen for the scre w
rubbing on the trough.
T h rough can be inspected with an ultrasonic device to check thickness of through. Mark
the through at a number of points, take reading of the thickness of the through with an
ultrasonic thickness tester.
Always Remember - Safety First!
(The material in this article remains copyright © IDCON, INC, 2003)
Flights that are rubbing on the
t rough might be due to bearing
f a i l u re or a bent scre w. A bearing
failure would cause the screw to
rub continuously, whereas a bent
s c rew would cause interm i t t e n t
rubbing.
Ultrasonic thickness test enables
monitoring of through thickness.
It can be especially useful for
critical applications where
leakage creates a lot of pro b l e m s
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