Wilo SCP Série Notice De Montage Et De Mise En Service page 56

English
7.2.3 Alignment of the pumps and its driving units
• When the base plate is levelled and the satisfac-
tory-alignment is completed, proceed with
connection of suction & delivery piping. Recheck
the alignment after piping and run the final grout
beneath the base plate. Allow minimum seven
days time for curing. Grout mix in the proportion
specified earlier for foundation bolt grouting
should be used. It is further recommend that all
hollow pockets in the base plate shall be filled
after curing of earlier grout.
• The following procedures outline recommended
practice given in BS-3170 in 1972 (Appendix A)
for checking shaft alignment. This method is inde-
pendent of the trueness of the coupling or shaft
and is, therefore, not affected by canted coupling
faces or eccentricity of the outside diameter of
the coupling. Before commencing the alignment,
rotate each shaft independently to check that the
bearings run freely and that the shaft is true to
0.1mm or better. Check that no damage can be
caused when the shaft of the driven unit is turned.
Coupling should be loosely coupled and the halves
must be free to move relative to each other,
otherwise gauge Indicators can be incorrect.
Where, tightly fitting pins or spring prevent loose
coupling, the springs or pins should be removed
and a line scribed across both half couplings and
readings taken only when the two marks are
aligned.
CAUTION! Risk of material damage!
All the alignments (angular as well as radial)
have to be carried out by using 3 dial indicators,
simultaneously.
Angular alignment
• After isolating the driven unit from its power sup-
ply, clamp two dial indicators at diametrically
opposite points on one half coupling or to the
shaft behind it with the plunger resting on the
back of the other half coupling (See figure 5).
Rotate the coupling unit. The gauges are to be in
line vertically and set the dial to read zero. Rotate
the coupling by 180 and record the readings on
each gauge. The readings should be identical,
though not necessarily zero. Either positive or
negative readings are acceptable provided they
are equally positive or negative. Adjust the posi-
tion of one of the units if necessary. Rotate the
coupling unit. The gauges are to be in the line
horizontally and adjust the dial to zero. Repeat the
operation outlined above by rotating the coupling
by 180°.
56
Radial alignment
• Clamp a dial gauge on one of the couplings or to
the shaft as shown in figure 5 with the plunger
resting on the rim of the other half coupling. Set
the dial zero. Rotate the coupling and note the
reading at each quarter revolution. Any variation in
the readings indicates the deviation from align-
ment and the position of one of the units must be
adjusted until the readings at each quarter revolu-
tion are identical or within the tolerances given
below. Refer figure 5b
Alignment Tolerances
Pump speed Angular
alignment
A < 1000 rpm 0.15 mm TIR
B > 1000 rpm to 0.1 mm TIR
1800 rpm
C 1800 rpm to 0.05 mm TIR
3000 rpm
TIR= Total Indicated Reading
Distance between coupling halves for SCP
pumps
Rotational speed
990 rpm 1450 rpm
– 3-55 kW
90-120 kW 75-250 kW
> 120 kW > 250 kW
Radial
alignment
0.15 mm TIR
0.15 mm TIR
0.1 mm TIR
Gap
[mm]
2900 rpm
3-55 kW 2-4
75-560 kW 2-6
> 560 kW 3-8
WILO SE 10/2019