26
DANG E R
Impermissible temperatures at the coupling or bearings caused by misalignment of the
coupling
Explosion hazard!
Make sure that the coupling is correctly aligned at all times.
C AUTION
Misalignment of pump and motor shafts
Damage to pump, motor and coupling!
Always check the coupling after the pump has been installed and connected to
the piping.
Also check the coupling of pump sets supplied with pump and motor mounted
on the same baseplate.
B
A
A
B
a)
b)
B
B
A
A
1
1
2
2
1
1
1
Straight-edge
2
Wedge gauge
5.6 Checking the coupling alignment
Fig. 10: a) Checking the coupling alignment and b) Aligning a spacer-type coupling
The coupling guard and step guard, if any, have been removed.
1. Loosen the support foot and re-tighten it without transmitting any stresses and
strains.
2. Place the straight-edge axially on both coupling halves.
3. Leave the straight-edge in this position and turn the coupling by hand.
The coupling is correctly aligned if the distances A) and B) to the respective shafts are the
same at all points around the circumference.
The radial and axial deviation of both coupling halves must not exceed 0.1 mm during
standstill as well as at operating temperature and under inlet pressure.
4. Check the distance between the two coupling halves around the circumference. The
coupling is correctly aligned if the distance between the two coupling halves is the same
at all points around the circumference.
The radial and axial deviation of both coupling halves must not exceed 0.1 mm during
standstill as well as at operating temperature and under inlet pressure.
5.7 Aligning the pump and motor
After having installed the pump set and connected the piping, check the coupling alignment
and, if required, re-align the pump set (at the motor).
5 Installation at Site
