Multitec – Multitech 1777.8/7-10 G3 User Manual

Page 8

Caution

Straight-edge

Gauge

Straight-edge

Caution

Multitec

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

M 12

4.6

30 Nm

15 Nm

M 12

4.6

30 Nm

15 Nm

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.