RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
41
6. Install bearing spacer (78) onto shaft (6).
7. Install bearing frame bearing isolator (169*) into
bearing frame (99).
CAUTION
While installing back-to-back ball bearings, DO
NOT unnecessarily hit ball bearings. If damage
to ball bearings occurs, replace damaged ball
bearings with new ball bearings.
After 20,000 Hours of service, replace the
ball bearings.
8. Install end of shaft (6) through outboard side of
bearing frame (99).
9. Install new thrust ball bearings (18) back-to-
back on shaft (6); back to back, meaning
lettering on the outer race facing each other.
10. The first bearing jam nut (22) is to have 3 ft-lbs
torque while holding the coupling end of the
shaft. The second bearing jam nut is to be
tightened to 30 ft-lbs while holding the first jam
nut.
11. Temporarily install bearing cap (37) with bolts
(601) on bearing frame (99). If removed, install
bore plug (709).
12. Install bearing frame (99) with bearing frame
bolts (600) confirm proper discharge orientation
and drain on bottom side of bearing frame.
13. Install spacer sleeve (14E*) on shaft (6).
14. Install impeller key (32A). Make sure that wear
ring (7X) is installed in diffuser (5X).
NOTE
Rotate pump to a vertical standing position
using a fixture that holds the discharge casing
feet for the purpose of proper axial impeller
alignment. This eliminates sag and helps with
figuring compression due to the tie rod
torqueing.
Check alignment in accordance with Table 3,
Axial Impeller Alignment Control Dimensions.
15. Install the last stage impeller (2X). Check the
depth reading in accordance with Table 3. If
shimming is required for proper setting use
interstage sleeve gaskets (73G), as necessary.
16. Install the next impeller key (32A) and interstage
sleeve (58).
17. Lubricate and install new O-ring (89D) into
interstage casing (111).
18. Install diffuser assembly [diffuser (5A), wear ring
(7X), diffuser bushing (63), and wear ring (7B)]
into interstage casing (111). Confirm diffuser
sits flat in interstage casing.
19. Install interstage casing (111) into discharge
casing (1).
20. Install the next stage impeller (2X) and impeller
key (32A).
21. Repeat steps 15 through 20 for each stage up
to the N
th
stage [depending on the RS model
(A,B,C,D, or E)].
NOTE
Refer to Figure 12, the back shroud of the
impeller by the wear ring surface will start to hit
on the diffuser wear ring face and diffuser
(Refer to Table 17) and Axial Impeller
Alignment cannot be achieved ( +/- .010” ).
The impeller/ wear ring interference is due to
the proximately .003” compression per
interstage casings when tightening the Tie
rods.
22. When there is no clearance between the
impeller back shroud corner by the wear ring
surface area and the diffuser, there will be a gap
between the impeller (2X) and sleeve (58)
(Refer to Table 17). This gap must be measured
and taken into consideration for the Axial
Impeller Alignment setting.
a. Measure the gap by leaving out sleeve (58)
and install impeller (2X).
b. Take a measurement the same way as
checking for Axial Impeller Alignment and
document.
c. Remove impeller and install sleeve.
d. Retake measurement to see if sleeve is
holding impeller up off of the diffuser - this
measurement should be more than the
previous measurement and check for Axial
Impeller Alignment.
e. If measurement is not higher, then remove
impeller and add a .010” shim (73G),
reinstall impeller and retake measurement
and see if Axial Impeller Alignment
measurement increases.
f. Continue adding and counting shims until
measurement increases.
g. Repeat for next stages.
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