Hilge GmbH & Co. KG | BA.H2A.KYY.001.01.17.GB
15
Operating manual
GEA Hilge HYGIA K
Mounting, installation and connection
Dry running
To achieve a proper sealing, mechanical seals require a
lubricating film between the sliding surfaces.
Dry running occurs if the lubricant film between the sliding
surfaces is missing or wears away. The frictional heat generated
by direct contact of the sliding surfaces will damage the
mechanical seal. Depending on the material combination, this will
happen within a few seconds. (see fig. 6).
Fig. 6:
Lubricating film between the sliding surfaces
P Pump side | A Atmospheric side
L Lubricating film | 0433.00 Mechanical seal
4.3.2
Space requirements
Pay attention to motor power. Maintain the minimum distances.
Fig. 7:
Minimum distances
4.3.3
Elimination of noise and vibrations
In order to achieve optimum operation and minimum noise and
vibration, consider vibration dampening of the pump. Generally,
always consider this for pumps with motors above 11 kW. Smaller
motors, however, may also cause undesirable noise and
vibration.
Noise and vibration are generated by the rotations in the motor
and pump and by the flow in the pipework and fittings. The effect
on the environment is subjective and depends on correct
installation and the state of the remaining system.
Foundation
Vibration dampening is best achieved by installing the pumps on
a plane and rigid concrete foundation.
Fig. 8:
Example of a pump foundation
– A - expansion joints
– B - foundation
– C - vibration dampers.
As a guideline, the weight of the concrete foundation should be
1.5 times the pump weight.
Vibration dampers
To prevent vibrations from being transmitted to the building, we
recommend that you isolate the pump foundation from buildings
by means of vibration dampers.
The selection of the correct vibration dampers requires the
following data:
• Forces that will be transmitted through the vibration dampers
• Motor speed, taking speed control into account as needed
• Required dampening in % (suggested value is 70 %).
The right damper varies from installation to installation, and the
wrong damper may increase the vibration level. Vibration
dampers should therefore be sized by the supplier.
Expansion joints
If the pump is installed on a pedestal with vibration dampers,
expansion joints must always be fitted on the pipeline
connections. This is important to prevent the pump from
"hanging" in the connections.
Install expansion joints in order to
• absorb expansion/contractions in the pipework caused by vari-
able liquid temperatures
• reduce mechanical strains that occur in connection with pres-
sure surges in the plant
• isolate mechanical structure-borne noise in the pipework (only
rubber bellows expansion joints).
Note: Do not install expansion joints to compensate for
inaccuracies in the pipework such as centre displacement of
flanges.
Fit expansion joints at a distance of at least 1 to 1½ times the
nominal flange diameter away from the pump on the suction as
well as on the discharge side.
This will prevent the development of turbulence in the expansion
joints, resulting in better suction conditions and a minimum
pressure loss on the discharge side.
We always recommend expansion joints with limiting rods for
flanges larger than DN 100.
The pipes should be anchored so that they do not stress the
expansion joints and the pump. Follow the supplier’s instructions
and pass them on to advisers or pipe installers.
TM0
5
644
4
4
9
1
2
WARNING!
Overheating!
▲
Damage to property.
►
Ensure sufficient ventilation.
►
Make sure not to reabsorb warm cooling air.
Consider other heat sources in the area.
►
Maintain minimum distances.
TM
05
10
38
31
1
2
P
A
0433.00
L
0.5 5 - 4 k W
5.5 k W
300 mm
1000
mm
300 mm
T
M
05
64
4
5
49
1
2
