5 Installation at Site
27 of 72
Sewatec (60 Hz)
CAUTION
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 if pump sets are 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
Fig. 7:
Checking the coupling alignment: a) coupling b) coupling with spacer
1
Straightedge
2
Feeler gage
ü
The coupling guard and footboard for coupling guard, if any, have been
removed.
1.
Loosen the support foot and re-tighten it without transmitting any stresses and
strains.
2.
Place the straightedge axially on both coupling halves.
3.
Leave the straightedge 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
0.0039 inch (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;
refer to the general arrangement drawing for the dimensions.
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
0.0039 inch (0.1 mm), during standstill as well as at operating temperature and
under inlet pressure.
5.
If the coupling has been correctly aligned, re-install the coupling guard and
footboard for coupling guard, if any.
Checking the coupling alignment with a laser tool
Coupling alignment may also be checked with a laser tool. Observe the
documentation provided by the manufacturer of the measuring instrument.
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).
