SPP Pumps Thrustream - Extended - Manual (Page 13)

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 11 of 28
6.1 Preparation for Maintenance
Electric Shock & Accidental
Starting Hazard
ISOLATE the equipment before
any maintenance work is done.
Switch off the mains supply, remove fuses,
apply lock-outs where applicable and affix
suitable isolation warning signs to prevent
inadvertent re-connection.
During maintenance personnel should be
aware of the risks of inhaling dangerous
fumes or vapours.
No special tools are required for pump
dismantling and re-assembly. However, it is
important to ensure the suitable lifting
equipment is available and that the work is
carried out in a clean area.
6.2 Repacking the Stuffing Box
Where a soft packed gland seal is fitted, it will
be necessary to replace the packing rings
periodically when the gland can no longer be
tightened to reduce leakage to the normal
level, or if the gland is overheating.
Packing Removal Procedure
1 Close the suction & discharge valves and
release pressure from the casing, remove the
gland retaining nuts (50F) and pull the split
gland (50) clear of the stuffing box.
46 51
50B
50F
50
50X
2 Remove the retainer (50X) and separate and
remove the two halves of the gland.
3
Carefully withdraw the old packing rings (51)
and lantern ring (46), using a pair of extractor
tools of the correct size placed on opposite
sides of the pump shaft (71).
46 51
4 Clean the sleeve, the bore of stuffing box, the
lantern ring and the split gland with a clean oily
cloth.
5
Check the sleeve for concentricity with the
stuffing box bore and that that the surface
under the packing rings is free from scores,
pitting or grooves.
6
Examine the gland for general condition and
replace if damaged.
Packing Preparation
If the packing is to be cut from a coil or long
length the size, number of rings and length is
thus:
Stuffing Box Data
PUMP
SHAFT
MODULE
SLEEVE
DIA.
mm
PACKING SIZE
SIZE of
RING
ID/OD
mm / mm
NO. OF
RINGS
PER
BOX
SQUARE
SECTION
mm
LENGTH
of ONE
RING
mm
1E 100 12.5 354 100/125 5
2E 120 12.5 416 120/145 5
3E 140 15.0 487 140/170 5
2T 85 12.5 290 85/110 5
3T 120 12.5 416 120/145 5
7 Wrap the packing around a dummy shaft, of
the same diameter as the sleeve.
8 To assist in cutting rings, two guide lines
parallel to the shaft axis and separated by a
distance equal to the packing section may be
drawn on the spiral.