RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
32
NOTE
DO NOT remove rotating element of
mechanical seal (90*) from sleeve (14A) at this
point, especially if mechanical seal is relatively
clean and in good working condition.
11. If necessary to replace mechanical seal (90*),
remove stationary element of mechanical seal in
seal gland (17A). Remove gland O-ring (89H)
from seal gland and discard O-ring.
12. For Type 1 mechanical seals (90*), remove
sleeve (14A) with rotating element of
mechanical seal (90*) from shaft (6). Inspect
rotating element of mechanical seal. If
replacement is required, remove rotating
element from sleeve.
13. Remove tie bolt nuts (616) and tie bolt washers
(645) from tie bolts (173). Remove tie bolts
connecting the suction case (9) and the
discharge case (1).
CAUTION
Use a hoist with adequate lifting capacity for
lifting the suction case (9).
NOTE
Mark or number each component while
dismantling according to sequence.
14. Remove suction casing (9). Remove sleeve key
(32X) from shaft (6).
NOTE
Before removing wear rings from casings
inspect per Section XI, Paragraph D, step 9.
Wear rings should only be removed for
replacement, refer to Section XI, Paragraph G
for wear ring replacement.
15. First wear ring will remain in the suction case
unless replacement is required. If replacement
is required, remove first wear ring (7A) from
suction case (9).
16. Remove casing O-ring (89D) from suction
casing (9) and discard O-ring.
NOTE
IMPORTANT: Check for shims between
impellers and spacer sleeves.
17. Remove sleeve O-ring (89X) from shaft (6) and
discard O-ring. Remove spacer sleeve (14D)
and first impeller (2A) from shaft.
18. Remove interstage case (111) with diffuser
(5A), wear rings (7B and 7X), diffuser bushing
(63), and casing O-ring (89D) intact. Remove O-
ring from interstage case and discard O-ring.
NOTE
Before removing wear rings from casings
inspect per Section XI, Paragraph D, step 9.
Wear rings should only be removed for
replacement, refer to Section XI, Paragraph G
for wear ring replacement.
19. If replacement is required, remove wear rings
(7B and 7X) and diffuser (5A).
20. Remove impeller key (32A) and interstage
sleeve (58) from shaft (6). Remove interstage
shims (73G), as necessary, from both sides of
interstage sleeve (58). Record the location of all
removed interstage shims for ease of assembly.
21. Remove interstage impeller (2X) from shaft (6).
22. Repeat steps 18 through 21 for each stage of
the pump. Number and match mark impellers
during removal.
NOTE
The last stage diffuser (5X), wear rings (7B and
7X), the last stage diffuser bushing (63X), and
O-ring (89A) will come from the discharge
casing together with the last stage diffuser.
23. Remove last stage diffuser (5X) from the
discharge case (1). Remove O-ring from last
stage diffuser bushing and discard O-ring.
Remove spacer sleeve (14E) from shaft (6).
24. Remove bolts (600) from bearing frame (99)
and discharge case (1).
NOTE
Shaft (6), mechanical seal (91*), seal gland
(17X*), bearing cap (37), ball bearings (18),
and bearing frame bearing isolators (169) will
come off with outboard bearing frame (99).
25. Remove bearing frame (99) assembly.
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