Page 160 - Improving Machinery Reliability

132 Improving Machinery Reliability

29. Rotor-balance logs
Rotor-balance target values given by the manufacturer can be compared
with minimum requirements quoted in the literature. Figure 3-36 shows a typi-
cal comparison chart. Rotor-balance logs should also be retained in the pur-
chaser’s equipment records.
30. Rotor mechanical and electrical run-out
Maximum acceptable mechanical run-out values are specified in the API
standards.
3 1. “As-built” data sheets
“As-built’’ data sheets as shown in Chapter 1 are the key ingredient of a
machinery-turnaround records system. The merits of cataloging these essential
data are self-evident. Observation and determination of wear is important for
failure analysis, and “as-built” data sheets provide a record of materials used
in equipment fabrication. Furthermore, these sheets allow both determination
and restoration of worn components.
32. “As-built” dimensions and data
a. Shaft or sleeve diameters at:
1, Thrust collar
2. Each seal component
3. Each impeller
4. Each interstage labyrinth
5. Each journal bearing
b. Each impeller bore
c. Each labyrinth bore
d. Each bushing-seal component

2

50,) IWO 2Mo 1” wo
Speed of Rotation, rpm
Figure 3-36. Unbalance tolerance versus speed. (Courtesy VDI Standards.)