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Sabtu, 16 Oktober 2010

Air, repair or redesign?

/ On : 22.12/ Thank you for visiting my small blog here. If you wanted to discuss or have the question around this article, please contact me e-mail at mozabani@yahoo.com
Hello again Air,

In your last hydraulic maintenance email,
we talked about how to check cylinder rod
buckling loads and stop your cylinder rods
from bending - to prevent premature failure
of the cylinder.

Today I want to share with you, three other
common causes of hydraulic cylinder failure:

Ballooned Tubes

Ballooning of the cylinder tube is usually caused by
excessive honing or insufficient wall thickness
and/or material strength for the cylinder's operating

Once the tube balloons, the correct tolerance between
the piston seal and tube wall is lost and high-pressure
fluid bypasses the seal. This high velocity fluid can
erode the seal and localized heating caused by the
pressure drop across the piston reduces seal life.

Insufficient Bearing Area

If the internal bearing areas in the gland and on the
piston are insufficient to carry the torsional load
transferred to the cylinder, excessive load is placed
on the rod and piston seals. This results in deformation
and ultimately premature failure of the seals.

Rod Finish

The surface finish of the cylinder rod can have a dramatic
effect on the life of the rod seal. If the surface roughness
is too low seal life can be reduced through inadequate

If the surface roughness is too high, contaminant ingression is
increased and an unacceptable level of leakage can result.

Keep in mind that not all hydraulic cylinders are made equal.
So if you have hydraulic cylinders that suffer recurring failure,
it's likely that modifications to the cylinder are required to
break the vicious circle of failure and repair.

Yours for better hydraulics knowledge,

Brendan Casey
Author of 'Insider Secrets to Hydraulics'; and
'Preventing Hydraulic Failures'.

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