6.5.5.2 Impeller wear ring TIR inspection
Figure 61: Impeller
122
202
203
178
101
304
198A
1.
Install the impeller:
a) Install the impeller key (178) on the shaft of the assembled bearing frame from which the seal-
chamber cover has been removed, and on which the runouts are within the established specifi-
cations per table below. The key should be at the top (12 o’clock) position for the impeller in-
stallation.
< 5" diameter
0.003
5" to 8" diameter
0.004
> 8" diamter
0.005
b) Install the impeller (101) on the shaft (122).
c)
Secure the impeller firmly with an impeller nut (304) and impeller nut set screw (198).
2.
Check the impeller wear-ring runout:
a) Mount the dial indicator.
b) Rotate the shaft so that the indicator rides along the casing-side impeller wear-ring (202) sur-
face for 360°.
c)
Repeat steps a and b for the wear ring (203) on the seal-chamber cover side.
6.5 Preassembly inspections
88
Model 3700i API610 / Type OH2 Installation, Operation, and Maintenance Manual