SPP Pumps Thrustream - Manual (Page 14)

Manual No/Rev
W12-003E / 6
Operators Instructions for Horizontal
Standard Thrustream Centrifugal Pumps
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 14 of 28
corrosion or other damage, which may
necessitate replacement.
7. Lightly oil the bearing and wrap it in
greaseproof paper to prevent contamination
before reassembly.
8. Check that the shaft and bearing housing are
clean and undamaged.
9. It is recommended that a new oil seal (72) is
fitted when bearings are replaced to ensure
that contamination is prevented.
10. Wipe the ‘oil seal recess in the support frame
(61) with grease, slide the new oil seal onto
the shoulder ring (77) and locate in the recess
in the support frame.
11. Heat the bearing (66) to approximately 100
0
C
(212
0
F) using bearing hotplate, induction
heater or oven. NOTE - Do not exceed 120
0
C
(248
0
F).
12. Slide the heated bearing onto the shaft to abut
the shoulder. Ensure that the bearing sits fully
and squarely against the shoulder.
13. Cool the bearing to room temperature and
coat both sides with two/three ounces of
recommended grease.
14. Coat the inside of the bearing housing (A62)
with grease and slide into place over bearing.
15. Fit four hexagon screws and washers (61A &
61F), tighten evenly to pull the bearing
housing into place.
16. Where mechanical seals are fitted, refit and
set the mechanical seal as per the seal
manufacturer’s instructions in Appendix III.
17. Refit the coupling and motor, check and adjust
the alignment as per instructions in section
4.8.
6.6 Mechanical Seal Replacement
Mechanical seals will need replacement when
failure has occurred, they may be replaced
without removal of the rotating assembly
It is recommended that new mechanical seals
are fitted when conducting a full pump strip-
down for overhaul to give maximum operating
life.
Mechanical Seal Replacement Procedure
1 For non-drive end seal replacement, proceed
as per the relevant bearing replacement
instructions, paragraphs 1 to 8 and for drive
end seal replacement proceed as per the
relevant bearing replacement instructions,
paragraphs 1 to 7.
2 Isolate the pump and drain the casing using
the air vent valves (308) and drain plugs (1D)
provided.
3 Disconnect the seal flush pipe, remove the
four hexagon screws (52A) that retain the
mechanical seal, and slide the seal assembly
off the shaft.
4 Fit a new mechanical seal as per the
manufacturer’s instructions in Appendix III
5 Reconnect the seal flush pipe.
6 For non-drive end seal replacement, proceed
as per the relevant bearing replacement
instructions, paragraphs 10 to 18 and for drive
end seal replacement, proceed as per the
relevant bearing replacement instructions,
paragraphs 9 to 17.
6.7 Pump Overhaul and Repairs
Refer to a certified Pump Section drawing or
the typical cross section drawing in Section 8.
Note the hazards outlined in Section 6.
Impeller Inspection Procedure
1 Isolate the pump and drain the casing using
the air vent valves (308) and drain plug (1D)
provided.
2 Remove the seal lubrication pipes (A107) from
the insert (53).
3 Remove the nuts (1F) from the casing studs
(1A & 1B) securing the top half casing (A1) to
the bottom half casing (B1).
4 Press or tap out the spring dowels (1C).
5 Using a pair of pry bars in the slots provided
between the top and bottom casings, apply
pressure to break the gasket seal.
5 Using the eyebolt and a suitable lifting device,
lift the top half casing (A1) clear of the
impeller, place to one side on a clean flat
surface.
6 At this stage, the impeller may be inspected
for damage or blocking and cleaning if
necessary.
To check the pump shaft (71) and impeller
(21) and to replace the wear rings (23) or soft
packed seal sleeves (21F & B47), it is
necessary to remove the rotating assembly
from the bottom half casing.