WK
Check the axial gap ‘‘E’’ at various points around the periphery,
with the aid of a feeler gauge, and place a short straight edge
across the outer diameter of the two coupling havles, forming
bridge. If the gap ‘‘E’’ remains constant around the periphery,
and if the straight edge lies flush at all points, the preliminary
alignment can be considered satisfactory (see Fig. 40 and 41).
The accurate coupling alignment requires the manufacturer of
a coupling alignment jig. This can be made from 20 x 20 flat
bar steel or similar, the jig should be attached to the shafts
(see Fig. 42).
Fig. 41 Aligning the spacer-type coupling by means of a
straight edge and gauge
Fig. 42 Coupling alignment jig
The coupling can be considered correctly aligned with the aid
of the jigs illustrated if the difference measured does not exceed
0.04 mm both in the radial and axial directions, measurements
being taken in 4 planes at 90
0
intervals. The coupling alignment
check should be repeated after the piping has been connected
to the pump.
8.4
Grouting in the Baseplate
After alignment of the coupling, the holes for the foundations
bolts and the baseplate should be grouted in with a quicksetting
cement mortar in 1:2 ratio (1 part of cement on 2 parts sand
and gravel). Make sure that all the boxes in the baseplate are
completely filled with the cement mortar and that no cavities
remain.
The foundation bolts should be tightened evenly and firmly
after the grout has set firmly. Then check with the aid of a dial
micrometer that the alignment is still correct.
8.5
Final Alignment
After all the pipelines have been connected and the direction
of rotation check has been carried out (with the pump
disconnected from the driver), the final alignment of the
pumping set should be effected. The same procedure would
be followed as for the preliminary alignment, i.e. the relevant
alignment jigs with 3 dial micrometers should be used and the
measurements previously described should be carried out at
the various shaft position (see section 8.3 ‘‘Aligning the
Couplings’’).
Caution :
The pump feet must be pulled tight against their
seating on the baseplate. The alignment can be considered
satisfactory if the dimensional deviations do not exceed 0.04
mm both in the case of the radial measurement and in the
case of the axial difference measurement (see section
‘‘Alignment’’).
The final measurement readings should be entered in the
system of coordinates on the erection check list. Any necessary
height adjustments should be effected by inserting shims of
appropriate thickness under the feet of the individual machines.
Fig. 39 Mounting the coupling
Wrong
Right
Fig. 40 Aligning the coupling bby means of a straight edge
and gauge
Straight edge
Straight edge
Gauge
E
a
1
b
1
a
b
Straight
edge
Gauge
D
D
A
B
C
Spacer type coupling
Max. clearance 0.04 mm
10
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