Multitec

5.3.1Aligning the pump / drive Coupling guard

Caution 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.

Caution Coupling check and realignment must be effected even if pump and motor are supplied

completely assembled and aligned on a common baseplate.

Straight-edge

a

b

a

b

Straight-edge

Gauge

Fig. 7 Aligning the coupling with the help of a gauge and a straight-edge

Straight-edge

a

b

a

b

Straight-edge

Gauge

Fig. 8 Aligning a spacer-type coupling

The radial and axial deviation between the two coupling halves must not exceed 0.1 mm.

Caution

 

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

 

Non-drive

 

 

 

 

 

 

 

 

end

 

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:

￿H [mm] = 1/100000 * (￿Tp * Hp - ￿Tm * Hm)

￿Tp

=

Temperature difference pump - ambient (￿C)

Hp

=

Height of pump axis [mm]

￿Tp

=

Temperature difference motor - ambient (￿C)

Hp

=

Height of motor axis [mm]

 

In any case, also when using this correction, the

Caution

 

 

 

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.

Caution

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.

8

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Image 8
Multitech 1777.8/7-10 G3 Aligning the pump / drive Coupling guard, Be tightened to the following torques Tightening torque
Page 7 Page 9

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