Where are we today?
In 1991, an international survey of the majority of types of industrial plants was made, and it was found that all four of the above mentioned maintenance techniques were being used, and in about the following amounts:
Over one-half of maintenance hours are spent in a reactive mode, performing emergency repairs on an unscheduled basis.
Less then ten percent of hours are spent on preventive maintenance.
Less then forty percent of maintenance activity is predictive, and
Very little time is spent on pro-active techniques.
From these numbers, it can be seen that, like Thomas Edison when he invented the phonograph, we have "barely scratched the surface" in bringing maintenance practices into the 20th century!
It makes sense for a modern machinery maintenance program to include elements of all these techniques, and to find out why; we will now take a closer look at them:
DLI Engineering provides products and services for Predictive Maintenance including vibration analysis instruments, monitoring and diagnostic software, and consulting for CBM programs.
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