Mounting, installation and connection
25
BA.10A.CNY.001.01.10.GB
4.5.2 Reduction of noise and vibration
Noise and vibration are generated by the pulsating flow of the
rotors and by the flow in pipes and fittings. The effect on the
environment is subjective and depends on correct installation
and the state of the remaining system. One way of reducing
noise and vibrations is by installing expansion joints.
Function of expansion joints:
•
Absorbility of expansions/contractions in the pipework
caused by changing the temperature of the pumped
medium.
•
Reduction of mechanical strains in connection with pres-
sure surges in the pipework.
•
Insulation of mechanical structure-borne noise in the
pipework (only rubber bellows expansion joints).
*
Do not install expansion joints to compensate for inaccura-
cies in the pipework such as centre displacement of flanges.
Fit expansion joints at a distance of minimum 1 to 1½ times
the nominal flange diameter away from the pump on the suc-
tion 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 pressure side. At high viscosity or velocities, we recom-
mend you to install larger expansion joints corresponding to
the pipework.
Fig. 9
Expansion
A - Expansion joints
B - Foundation
C - vibration absorber
K.
0346V
1
A
B
C
