Emerson 2130 RBM Consultant Pro, Reference Manual

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G-5
Off-line to On-line Running Condition
Movement of shaft centerlines associated with (or due to) a change in pressures,
temperatures and other forces between the static and operating condition.
Offset
Distance between rotational centerlines at any given normal plane, usually mea-
sured at the coupling midpoint.
Perpendicular
At right angles (90°) to a given line or plane.
Pipe Strain
Casing and shaft distortion caused by improper pipe flange fitup.
Predictive Maintenance
Technology of periodically monitoring the actual condition of machines to dis-
cover faults, to determine probable time of breakdown, and to provide scheduled
downtime for repair that avoids excessive cost and lost production.
Primary Alignment
See Cold Alignment.
RBM
Reliability Base Maintenance — the modern maintenance management method
that integrates preventive, predictive, and proactive maintenance strategies. This
total management method not only improves detection methods but uses root
cause analyses to find and correct the actual cause(s) of the problems thereby elim-
inating unpredictable failures in the future.
Repeatability
The consistency (or variation) of readings and results between consecutive sets of
measurements.
Resolution
The smallest change or amount that a measurement system can detect.
Reverse Indicator Method
Method for taking shaft alignment reading with indicators mounted radially at
opposite ends of a spanned section (on each machine).