SPP Pumps Thrustream - Extended - Manual (Page 19)

Operators Instructions for Horizontal
Extended Thrustream Centrifugal Pumps
Manual No/Rev
W12-005E / 3
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 17 of 28
Where the location was not marked, please
refer to the pump section drawing supplied or
to SPP Pumps Ltd for dimensions A or B.
2 Screw the locked impeller nut (B21) or sleeve
(A47) onto the shaft (71) to the marked
position. Turn the nut or sleeve to the nearest
slot to align with the keyway.
3 Place impeller key (116) into keyway and tap
the end right home under locked impeller nut
or sleeve.
4 Check the impeller for correct direction of
rotation and slide onto shaft.
5. Screw free impeller locking nut (A21) or
sleeve (B47) onto shaft to retain the impeller
against the locked impeller nut or sleeve.
6. Slide the casing wear rings (23) onto the
impeller.
7. Lightly grease and carefully fit new ‘O’ rings
(53R) to the inserts (A53 & B53).
8. Slide the inserts on to the shaft with the guide
vane at top position.
9. For soft packed pumps: Fit the packing (51),
lantern rings (46) and glands (50) as per
instructions in section 6.2.
10. Fit the liquid throwers (72) on the shaft and
secure with screws (72A).
11. For mechanical seals: Fit the throttle bushes
(45) onto shaft and slide them into position
inside the inserts.
12. Fit the mechanical seals to the shaft as per
the manufacturer’s instructions in Appendix III.
13. Fit new oil seals (64R) into the bearing caps
(63) and slide them on the shaft, ready for
assembly of the bearing housings.
14. Heat the bearings (66 & 67) to approximately
100 0 C (212 0 F) using bearing hot-plate,
induction heater or oven. NOTE:- Do not
exceed 120
0
C (248
0
F).
15. Slide the heated bearings onto the shaft to
abut the shoulder. Ensure that the bearings sit
fully and squarely against the shoulder.
16. Place the locking washer (75F) onto the shaft
and screw on the bearing lock nut (75).
17. Fit and tighten the bearing locknut to 300 Nm
and lift the tab of the lock washer.
18. Cool the bearings to room temperature and
pack both sides with two/three ounces of
recommended grease.
19. Coat the inside of the bearing housings (62)
with grease and slide into place over the non-
bearings. If necessary use two screwed rods
to pull the bearing housing towards the
bearing cap.
20. Secure the bearing housings (62) to the insert
(A53 & B53) with four socket capscrews (53A)
21. Check and install the dowel pins (23A) in the
bottom half casing (B1) to locate the case
wear rings (23).
22. Place the rotating assembly into the pump
casing bottom half (B1). Correct any
excessive ‘O’ ring twisting or buckling. Check
that the impeller is centralised in the casing
and that there are no rubs.
23. Install casing gasket (1U) with a light coat of
commercial cup grease on both gasket
surfaces. Carefully align the inner edge of the
gasket with the insert ‘O’ rings.
24. Lower the upper half casing (Al) into place and
install casing joint nuts (1F).
25. NOTE: When installing upper half casing,
make sure that the ‘O’ rings (53R) are not cut
or pinched and that the casing gasket is hard
against the ‘O’ rings.
26. Insert casing joint dowels (1C) and drive them
home. Tighten the joint nuts (1F) to the
specified torques
Thread Size lb/ft Nm
M16 120 160
M20 260 360
M24 440 600
27. Tighten the case screws in the following
sequence: