Data Collection - std10520092

DOE-STD-1052-93

1.2.3 Surveys should be scheduled to coincide with in-service testing for equipment that is

normally not operated except for testing.

1.3 Data Collection

1.3.1 For each machine and measurement point, data should be taken in a format

designated by the predictive maintenance coordinator (i.e., filtered, unfiltered,

velocity, displacement, etc.).

1.3.2 Any instrument capable of reading the desired vibration parameters may be used to

obtain data. If possible, the same type of test equipment should be used on any

given component.

1.3.3 Each set of readings on a particular machine should be made with the machine

running under the same operating conditions (load, flow, head, etc.) as previous

readings. On major equipment, the operating conditions may be determined by

observing local instruments and/or by contacting operations.

1.3.4 Vibration readings should be taken at all measurement points included in each

vibration survey route. If readings cannot be taken because of operating or

environmental conditions, the readings should be rescheduled. Corrective actions

should be taken to enable readings to be taken such as increased radiation shielding,

decontaminated areas, use of ice vests, etc.

1.4 Examination and Evaluation of Trend Data

1.4.1 After taking each set of vibration data, the data should be reviewed to identify any

excessively high readings or undesirable trends indicating a degradation of equipment

condition.

1.4.2 Vibration monitoring/analysis is not an exact science; greater emphasis should be

placed on observed trends than on actual vibration levels at any time. The severity of

an individual vibration reading should be determined by a subjective evaluation of all

observed symptoms and should consider such factors as prior experience with the

same or similar equipment, industry standards, regulatory requirements, and vendor

recommendations.

1.4.3 As an aid to rapid identification of potential problems, nominal alarm limits for each

monitored machine should be established by the predictive maintenance coordinator.

Comparable limits should be used for machines that are similar in design or are

known to have similar vibration characteristics. Limits should be established by

examining historical data for machines of the same type that have a good operating

history.

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