Skip to main content

Replies sorted oldest to newest

"I guess with baseline measurements we can get the acceptable levels."

I prefer to think of it as Baseline Machine Condition that the vibration measurements actually represent. Whether the machine is new or 10-years old when you take the first measurements, you have to determine what the condition is that you are starting from. Typically if there are no faults present and the vibration levels are low compared to Severity Guide or other similar machines, then you "can get the acceptable levels".

Walt

RM
@Registered Member posted:

Age is less of a factor than the care given to follow operating guidelines and maintenance plans.  Many steam turbine generators have been performing for more than 50 years.  After each major overhaul, it's appropriate to reset the baseline data.

But in our case Malcolm, age is getting to be more of a factor, especially when we consider buying green bananas.

Best regards,

JGW (BN-MDS 100% retired)

RM

Your results may vary!   If a pump is built with proper parts balanced and has the correct shaft clearances and runout it may exhibit lower vibration levels than it the new baseline.  I was just involved in a pump that was rebuilt 4 months ago.  It was installed without motor shims.  When the coupling failed four months later, it was found to be over .080 high.  The alignment was corrected and the levels were down but not as far as I would have expected.   The gross misalignment had taken it's toll on the equipment.   I typically don't consider age.  I look at the condition.  If it is engineered correctly, installed correctly, rebuilt to specifications I'm good. Age will have very little to do with how it runs.

RM

A bathtub curve graphically relates three types of failure: early, random (constant failure), and wear out. Manufacturing and material defects typically result in early, rapid failure of objects: that region of a bathtub curve is called infant mortality.

new machine also can fail as above infant failures. So age /vs how the machine is operated with respect to its design /vs maintainability of the machine

FFT Spectrum gives you instant healthiness of  the machine so no need to trend the vibration and base line data comparison

RM

Add Reply

×
×
×
×
Link copied to your clipboard.
×