Multitech 1777.8/7-10 G3 - Manual (Page 8)

Caution
Caution
Straight-edge
Straight-edge Gauge
a
a b
b
a b
a b
Gauge
Straight-edge
Straight-edge
Caution
Caution
Caution
Multitec
8
5.3.1 Aligning the pump / drive
Coupling guard
In compliance with health and safety
regulations the pump must not be operated
without a coupling guard / a guard on the drive lantern. If the
customer specifically requests not to include a coupling guard /
lantern guard in our delivery, then the operator must supply one.
Baseplate-mounted units
After fastening the baseplate on the foundation, the
coupling must be thoroughly checked and the pump
set be re-aligned (at the motor), if required.
Prior to checking the alignment/realignment, loosen the pump
feet and re-tighten without transmitting any stresses or strains.
Coupling check and realignment must be
effected even if pump and motor are supplied
completely assembled and aligned on a common baseplate.
Fig. 7 Aligning the coupling with the help of a gauge and a
straight-edge
Fig. 8 Aligning a spacer-type coupling
The radial and axial deviation between the two coupling halves
must not exceed 0.1 mm.
For fluid temperatures of 120°C and higher, the
foot bolts holding the pump on the baseplate must
be tightened to the following torques:
Tightening torque
MTC Thread Strength Drive
end
Non-drive
end
32 M 12 4.6 30 Nm 15 Nm
50 M 12 4.6 30 Nm 15 Nm
65 M 16 4.6 60 Nm 30 Nm
100 M 20 4.6 120 Nm 60 Nm
125 M 20 4.6 120 Nm 60 Nm
150 M 30 4.6 450 Nm 200 Nm
This will avoid that any increase in pump length due to
thermal expansion will lead to warping and deformation.
The increase in height of pump and drive due to thermal
expansion may differ; this has to be considered when
aligning the coupling of pump units handling temperatures of
100°C and higher.
The following equation can serve as a guide to estimate by
how much the motor has to be elevated in relation to the
pump:
DH [mm] = 1/100000 * (DTp * Hp - DTm * Hm)
DTp = Temperature difference pump - ambient (°C)
Hp = Height of pump axis [mm]
DTp = Temperature difference motor - ambient (°C)
Hp = Height of motor axis [mm]
In any case, also when using this correction, the
coupling has to be re-aligned when the unit has
reached operating temperature.
Close-coupled pumps and vertical pumps
Alignment between the motor and the pump is ensured by the
centering effect between the motor flange and the drive lantern
flange. It must be easy to rotate the shaft.
For MTC V 32-65 please observe the adjusting
dimensions for coupling alignment (see page 31).
Final check
Re-check the alignment as described in the sections above. It
must be easy to rotate the coupling by hand. Check the integrity
and proper functioning of all connections.