49
A.0500.351 – IM-TGH/07.02 EN (10/2015)
3.18.9.6 Shaft coupling
Internal gear pumps demand a relatively high starting torque. During the operation shock loads are
occurring due to pulsations inherent to the gear pump principle. Therefore, choose a coupling which
is 1.5 times the torque recommended for normal constant load.
Alignment
The pump and motor shafts of complete units are accurately pre-aligned in the factory.
After installation of the pump unit, the pump and motor shaft alignment must be checked and
re-aligned if necessary.
Alignment of the coupling halves may only take place by moving the electric motor!
1 Place a ruler (A) on the coupling. Remove or add as many shims
as is necessary to bring the electric motor to the correct height so
that the straight edge touches both coupling halves over the entire
length, see figure.
2 Repeat the same check on both sides of the coupling at the height of
the shaft. Move the electric motor so that the straight edge touches
both coupling halves over the entire length.
3 To be certain the check is also undertaken using external callipers
(B) at 2 corresponding points on the sides of the coupling halves,
see figure.
4 Repeat this check at operating temperature and spend time achieving minimum alignment
deviation.
5 Fit the protecting guard. See the figure below and the corresponding table for the maximum
allowed tolerances for aligning the coupling halves.
Alignment tolerances
External diameter
of coupling [mm]
Va
Va
max
- Va
min
[mm]
Vr
max
[mm]
min [mm]
max [mm]
81-95
2
5*
4
6*
0.15
0.15
96-110
2
5*
4
6*
0.18
0.18
111-130
2
5*
4
6*
0.21
0.21
131-140
2
5*
4
6*
0.24
0.24
141-160
2
6*
6
7*
0.27
0.27
161-180
2
6*
6
7*
0.30
0.30
181-200
2
6*
6
7*
0.34
0.34
201-225
2
6*
6
7*
0.38
0.38
* = coupling with spacer
Belt drive
Belt drives also increase the loading on the shaft end and the bearings. Therefore, certain limitations
must be imposed on the maximum load of the shaft, viscosity, pumping pressure and speed.
3.18.9.7 Guarding of moving parts
Before commissioning the pump, place a protective guard over the coupling or belt drive. This guard
must comply with the EN 953 design and construction standard.
For pumps operating at temperatures above 100°C, ensure that bearing bracket and bearings are
cooled sufficiently by the surrounding air. Openings in the bearing bracket must not be guarded
if the rotating parts do not have any projections (keys or keyways) which could cause injury (see
prEN809). This simplifies the inspection and maintenance of the shaft seal.
Summary of Contents for TG H15-50
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