SPP Pumps Thrustream - Manual (Page 16)

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 16 of 28
impeller nut (B21) on a pump fitted with
mechanical seals.
For Counter Clockwise pump construction:
8. Using a suitable ‘C’ spanner, unscrew and
remove the free - drive end sleeve (A47) on a
soft packed pump or - impeller nut (A21) on
umps fitted with mechanical seals.
9. Note Light tapping with a soft faced mallet
may be needed to free the impeller from the
shaft, do not damage the impeller if it is to be
reused.
10. Using suitable pullers or levers slide the
impeller (21) of the shaft (71) from the drive
end.
11. Withdraw the impeller key (116) and unscrew
and remove the locked – non-drive end sleeve
(B47) on a soft packed pump or locked -
impeller nut (B21) on pumps fitted with
mechanical seals.
Cleaning and Inspection of Parts
1. Clean the bearings thoroughly with an
approved cleaning fluid, kerosene or white
spirit.
2. Dry the bearings with dry compressed air or
with a clean soft cloth by hand and by spinning
by hand. Confirm that the bearings rotate
smoothly without slackness.
3. DO NOT OVERSPIN A CLEAN DRY
BEARING.
4. Inspect the bearings for wear, fractures,
cracks, corrosion or other damage to the
running surfaces, which may necessitate
replacement.
5. Coat the bearings with rust preventive oil and
wrap in greaseproof paper.
Note: It is recommended that all oil seals, ‘O’ rings
and gaskets: are replaced by new parts during
an overhaul. If ‘O’ rings are to be reused they
should be left in place in their grooves and
protected from contamination by oil and dirt.
6. Remove all O-rings from their grooves and
discard where these are to be replaced.
7. Remove all grease and other deposits from all
other parts using suitable cleaning fluid and a
clean dry cloth.
8. Coat all unpainted carbon steel parts with a
light smear of oil to prevent rust.
9. Measure the inside diameter of plain bearing,
wear ring and interstage plate surfaces and
the outside diameter of the shaft and wear ring
surfaces on each impeller, calculate the
clearance and compare these with dimensions
in Section 6.7.
10. Mount the shaft between point centres or on
rollers, and place the stem of a dial indicator in
contact with the shaft. Set the indicator dial at
zero and turn the shaft slowly by hand.
Readings at any point A, B, C, D and E must
not vary more than 0.05mm (0.002").
11. For soft packed pumps: examine the shaft
sleeves for wear, replace the sleeve if it is
scored or has any visible surface damage.
12. If the shaft runs true within tolerance, remount
the shaft as in 2 but with the sleeve fitted in
position, and check the sleeves runout at the
packing contact positions. Indicator readings
must not vary more than 0.08mm (0.003").
13. The sleeve can be re-ground to provide a new
packing surface, to a maximum of 1.0mm
(0.04") below the initial diameter. Do not grind
reduce sleeve diameter in the throat bush
area unless scored. The surface finish of the
sleeve should be 20-30 C.L.A.
14. Scour any rust or scale from internal iron non-
fitting surfaces and immediately repair or
renew any previous coating. Use WRC
approved coating for pumps used for potable
water.
15. Clean all threads with kerosene followed by
wire brushing, dry and wrap shaft threads with
protective adhesive tape.
16. If the unit is not to be reassembled
immediately, brush all bright iron and steel
surfaces with Texaco Rust Proof Compound L
or Rust Proof Compound Spray or a suitable
equivalent rust preventive fluid.
17. Protect all parts (especially mechanical seal
parts and faces) against loss, weather or
mechanical damage.
6.8 Pump Assembly Instructions:
Before Assembly
1
Re-examine all old parts intended for re-fitting.
Worn, damaged or corroded parts should
either be re-conditioned or, if beyond this, be
discarded and replaced by new.