WIK USER INSTRUCTIONS ENGLISH BO2662 5/09
Page 52 of 76
4) Install lifting gear on part, if necessary, then lift
part clear of assembly and set it aside.
Remove lifting gear.
5) Allow the shaft [2100] to cool to ambient
temperature before disassembling the next
stage.
6.7.8.2
Stage Number System And
Balanced Parts
Each impeller key [6700.4], split ring [2531.1] (if
installed), and impeller [2200] is fitted for a
particular position on the shaft [2100]. To help
match parts and stages, a number is stamped on
the back of each part. This indicates the number of
the stage for which the part is fitted. The suction
impeller [2200.1] is number 1, and the numbering
continues consecutively to the discharge stage.
Therefore, in order to maintain dynamic balance of
the rotor, it is very important to ensure that each
impeller [2200], split ring [2531.1], and impeller
key(s) [6700.4] is matched by stage number
during disassembly and assembly.
6.7.8.3
Vertical Disassembly
The vertical disassembly procedure assumes that
the coupling end of the shaft [2100] will be
supported in the tube and bushings from the
suction spacer casing [1130] to the end of the
shaft. To disassemble the shaft [2100] in the
vertical position, proceed as follows:
Failure to clamp the unit together
before moving it to the vertical position will result
in damage to parts.
1) With internal assembly in a horizontal position,
securely clamp internal assembly in vertical
assembly apparatus and move it to the base
assembly in the work area.
2) Using two hoists and soft cables (one set
attached to the vertical assembly apparatus at
each end of the internal assembly) slowly lift
the free end while preventing the coupling end
from sliding and carefully tip the unit to the
vertical position. Set unit on the base
assembly so that the weight of the assembly is
on the suction spacer casing [1130] and the
shaft [2100] is in suspension. Remove cables,
hoists, and vertical assembly apparatus.
See the assembly drawing in the back of
this manual, to determine the method used to
secure the balance drum [6230].
3) Remove balance drum split ring retainer screw
[6570.5], split ring retainer ring [2530.2] and
split ring [2531.2], if applicable.
4) Heat and remove balance drum [6230] using
the procedure outlined in section 6.7.8.1
above. If necessary, slide the drum toward the
coupling end of shaft [2100] to clear and
remove split ring [2531.2] before removing
sleeve. Remove the balance drum key
[6700.5].
5) Remove the assembly rail [9363]
6) At the discharge stage, proceed as follows:
a) Heat and remove the discharge impeller
[2200] using the procedure outlined in
section 6.7.8.1 above. Remove the split
ring [2531.1] (if installed) and impeller
key(s) [6700.4].
b) Heat the intermediate cover [1460]
adjacent to the discharge spacer casing
[1140] using the procedure outlined in
section 6.7.8.1 above. Then remove
discharge spacer casing [1140].
7) At the next to last stage, and each successive
stage (except the first stage) proceed as
follows:
a) Heat and remove the impeller [2200] or
spacer sleeve (if installed) using the
procedure outlined in section 6.7.8.1
above. Remove the split ring [2531.1] (if
installed) and impeller key(s) [6700.4].
b) Remove the intermediate cover [1460] or
destaging spacer (if installed) using the
procedure outlined in section 6.7.8.1
above.
8) Remove the suction impeller [2200.1] as
follows:
a) Set up soft-faced V-blocks near base
assembly. The blocks should be
positioned to support the shaft [2100] at
points about 25% of total shaft length from
the ends of the shaft. The block under the
coupling end must not prevent removal of
the suction impeller [2200.1] from the free
end of the shaft [2100].
b) Install shaft hoisting fitting on free end of
shaft. Attach soft cable and hoist to fitting
and move shaft to V-blocks. Place nylon
lifting strap and hoist on coupling side of
suction impeller [2200.1] and use both
hoists to place shaft in V-blocks.
To remove the suction Impeller [2200.1],
It may be necessary to strike the impeller skirt with
two soft-faced mallets at points 180 degrees apart
using simultaneous blows.
