Table of Contents
Advertisement
en
6.6
Aligning the unit
6.6.1
Coupling alignment
24
Installation and electrical connection
NOTICE
Avoid flow cavitation!
• A settling section must be provided upstream and downstream of the pump in the
form of a straight pipe. The length of the settling section must be at least 5 times
the nominal diameter of the pump flange.
ƒ
The pipes and pump must be free of mechanical stress when installed.
ƒ
The pipes must be fixed in such a way that the pump does not have to support the
weight of the pipes.
ƒ
Clean, flush and purge the unit before connecting the pipes.
ƒ
Remove the covers from the suction and discharge ports.
ƒ
If required, install a dirt filter upstream of the pump in the pipe on the suction side.
ƒ
Then connect the pipes to the pump connecting pieces.
CAUTION
Incorrect alignment can result in property damage!
The transport and installation of the pump can affect the alignment. The motor must
be aligned to the pump (not vice versa).
• Check the alignment before the first start.
CAUTION
Changes to the alignment during operation can result in property dam-
age.
The pump and motor are usually aligned at ambient temperature. Thermal expansion
at operating temperature can change the alignment, particularly in the case of very
hot fluids.
Adjustment may be required if the pump is required to pump very hot fluids:
• Allow the pump to run at the actual operating temperature.
• Switch off the pump then immediately check the alignment.
Precondition for reliable, smooth and efficient operation of a pump unit is proper align-
ment of the pump and the drive shaft.
Misalignments can be the cause of:
ƒ
excessive noise development during pump operation
ƒ
vibrations
ƒ
premature wear
ƒ
excessive coupling wear
S
max.
∆Ka
S
min.
) 1
Fig. 17: Coupling alignment without spacer
S2
max.
∆Ka
S2
min.
) 1
Fig. 18: Coupling alignment with spacer
S
max.
S
min.
) 2
S2
max.
S2
min.
) 2
) 3
) 3
WILO SE 2020-10
Advertisement
Table of Contents
