Danfoss PAH 2, Installation, Operation And Maintenance Manual

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Guideline Trouble shooting guide for PAH, PAHT, PAHT C , PAHT G pumps
66 180R9379 | AQ188686503004en-000801 | PAH 2-12.5 } 07.2022
5. Noise from installation
Cause Remedy Comments
5 .1 Inlet/outlet connections (hoses/pipes)
5 .1 .1 Use flexible hoses at inlet/outlet connec-
tions .
5 .1 .2 Mount the connections to the frame by a
vibration dampener mounting plate .
Non-flexible connections mounted directly on
the frame will cause even small pressure
pulsations from pump and create vibrations in
the system/plant .
5 .2 Length/dimension of inlet/outlet line 5 .2 .1 Increase pipe diameter and/or reduce the
number of bends .
Too small pipes or too many bends may create
too fast flow/turbulence through the pipes and
thus increase the noise level .
5 .3 Hose stiffness 5 .3 .1 Use a more flexible hose . Too stiff hoses cannot dampen the small
pressure pulsations from the pump, and
subsequently vibrations occur in the system/
plant .
5 .4 Hoses/pipes mounted directly on frame
5 .4 .1 Mount the connections to the frame by a
vibration dampener mounting plate .
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 .
5 .5 Vibration dampener under the electric
motor
5 .5 .1 Mount a vibration dampener below the
motor/pump .
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 .