Multitech 1777.8/7-10 G3 Multitec, 5.3.1Aligning the pump / drive Coupling guard

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.

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