Preventive Maintenance Task Selection

DOE-STD-1052-93

CONDITION-MONITORING TASK - A task that is used to gather

data so that component condition or performance may be monitored and

evaluated in order to perform planned maintenance, a condition direct

task, prior to equipment failure. Condition monitoring tasks are

selected according to the parameters required to describe equipment

performance.

CONDITION-DIRECTED TASK - A task performed on an as-needed

basis when the condition or performance of the component has reached

a predefined limit or standard. This is normally a restorative task that

is performed prior to failure, such as changing a pump seal when

leakage reaches five gallons per minute. In some cases, the

component's performance shall be baselined. Baselining involves

measuring specific parameters during routine operation so they may be

compared to established values, levels, and limits of performance that

are indicative of normal, abnormal, or unacceptable conditions.

FAILURE-FINDING TASK - A task performed to discover a hidden

failure. The intent of the task is not to monitor and anticipate failure

as with a condition-monitoring task but rather to find a failure after it

has occurred, at which time corrective maintenance may be performed.

An example of this is a surveillance test that starts and runs the diesel--

generators every 30 days. If the test results in the discovery of a

failure, then corrective action should be taken.

8.1.2.1

The LTA uses a series of questions to identify applicable and

effective PM tasks for preventing or detecting failures. There

are three sections of the LTA. One section addresses

operational and safety classifications of failure modes while the

other sections address economic and hidden failure modes.

Select tasks by answering each of the LTA questions "yes" or

"no".

NOTE:

Since many existing tasks are based on

technical safety requirements, the surveillance

test program should be used when practical to

gather condition-monitoring data.

8.1.2.2

Identify, describe, and record the recommended PM tasks and

record the bases for the recommended task.

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