Noise From Installation - Danfoss APP W HC Series Operation Manual

Service guide | Trouble shooting guide for APP, APP S and APP S 674 pumps
5.

Noise from installation

Cause
5.1 Inlet/outlet connections (hoses/pipes)
5.2 Length/dimension of inlet/outlet line
5.3 Hose stiffness
5.4 Hoses/pipes mounted directly on frame
5.5 Vibration dampener under the electric
motor
68 | © Danfoss | DCS (im) | 2022 .01
Remedy
5 . 1 . 1 Use flexible hoses at inlet/outlet connec-
tions . Danfoss can provide flexible hoses .
Please contact Danfoss High Pressure
Pumps sales office for further information .
5 . 1 .2 Mount the connections to the frame by a
vibration dampener mounting plate .
5 .2 . 1 Increase pipe diameter and/or reduce the
number of bends .
5 .3 . 1 Use a more flexible hose . Danfoss can
provide flexible hoses . Please contact
Danfoss High Pressure Pumps sales office
for further information .
5 .4 . 1 Mount the connections to the frame by a
vibration dampener mounting plate .
5 .5 . 1 Mount a vibration dampener below the
motor/pump .
180R9410 | AQ282628894589en-000801 | IOM APP W HC 15-30 Pumps
Comments
Non-flexible connections mounted directly on
the frame will cause even small pressure
pulsations from pump and create vibrations in
the system/plant .
Too small pipes or too many bends may create
too fast flow/turbulence through the pipes and
thus increase the noise level .
Too stiff hoses cannot dampen the small
pressure pulsations from the pump, and
subsequently vibrations occur in the system/
plant .
If the hoses are mounted directly on the frame,
the small pressure pulsations from the pump
can be transferred to the frame and the rest of
the system/plant .
When no dampener is installed below the
electric motor, vibrations from the motor and
pump may be transferred to the frame and the
rest of the system/plant .