Page 28 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Introduction to Vibrations

2. Critical to Operation
This category of equipment includes machines within the
process that disrupt normal production. The cost for down
time should be considered when assigning a value to this
group of equipment. In general, this equipment has no
backup or spare.

3. Chain Reactive
This category of equipment causes other machines or equip-
ment to fail when it fails. As an example, if an oil pump
supplying oil to the bearings of a large press were to fail, it
could potentially cause failure of the press as well.

4. Expensive to Repair
This category of equipment covers machines that may be
difficult to find parts for, parts are expensive, requires out-
side labor, machining, special tools, etc.

5. One of a Kind (Exotic)
This category of equipment covers machines that are difficult
to impossible to replace. This can be because of limited appli-
cation, older equipment, foreign manufacture, or custom de-
sign.

6. Long Tedious Repair
This category of equipment covers machines that require
specialized labor and tools. The repair of this type of equip-
ment may require contract labor.

7. Hard to find Parts
This category of equipment covers machines whose parts are
not off-the-shelf items. Some of these parts may take weeks to
obtain.

The following illustrates a form filled in for an acid pump: