English (GB)
17
9.3 Vibration dampening
To prevent vibrations from being transmitted to the building and
pipework, it is advisable to fit expansion joints and vibration
dampers. See fig. 18.
Fig. 18
Vibration dampening
Vibration dampers
To prevent vibrations from being transmitted to the building, it is
advisable to isolate the pump foundation from buildings by means
of vibration dampers.
To select the correct vibration damper, the following details are
required:
• Forces transferred through the damper
• Motor speed
• Desired dampening in % (recommended value: 70 %)
The selection of vibration damper differs from installation to
installation. A wrong damper may, in certain cases, increase the
vibration level. Vibration dampers should therefore be sized by
the supplier.
If the pump is installed on a foundation with vibration dampers, fit
expansion joints on both sides of the pump. This prevents the
pump from "hanging" from the flanges.
Expansion joints
• Expansion joints provide the following functions:
• Absorption of thermal expansion and contraction of pipework
caused by variations in liquid temperature.
• Reduction of mechanical influences in connection with
pressure surges in the pipework.
• Isolation of structure-borne noise in the pipework (only rubber
bellows expansion joints).
Fit the expansion joints both on the suction and the discharge
sides. The distance from the pump should be at least 1 to 1 1/2 x
DN diameter. This prevents turbulence in the joints and ensures
optimum suction conditions and minimum pressure drop on the
discharge side.
At high water velocities (> 5 m/s), it is advisable to fit larger
expansion joints matching the pipework.
9.4 Levelling
Place the fire pump set on the foundation or an even floor and
anchor it with adequately sized bolts. The entire base frame must
be supported uniformly. See figures 19 and 20. If necessary, use
shims for horizontal levelling of the base frame.
Fig. 19
Correct installation
Fig. 20
Incorrect installation
In addition, we recommend fitting vibration dampers under the fire
pump set. See section
.
TM
03 394
9 120
6
Caution
Do not fit expansion joints to make up for
inaccuracy in the pipework, e.g. centre
displacement or misalignment of flanges.
Warning
The fire pump set should only be lifted by
qualified personnel.
When lifting the entire fire pump set, never use
the lifting eyes of the individual components.
Use only suitable lifting equipment in proper
condition. See also weight specifications in
section 7. Technical data.
During transport of the fire pump set, the cabinet
door must be closed and locked.
TM
03
39
50
12
06
TM
03
43
24
20
06
