Mechanical Vibrations; Gas Pulsation - Danfoss MLM Series Application Manuallines

Application Guidelines

Mechanical vibrations

Gas pulsation

Sound and vibration management
Vibration isolation constitutes the primary
method for controlling structural vibration.
MLZ/MLM scroll compressors are designed to
produce minimal vibration during operations.
The use of rubber isolators on the compressor
base plate or on the frame of a manifolded unit
is very effective in reducing vibration being
transmitted from the compressor(s) to the unit.
Rubber grommets are supplied with all MLZ/
MLM compressors. Once the supplied rubber
grommets have been properly mounted,
vibration transmitted from the compressor base
plate to the unit are held to a strict minimum.
The MLZ/MLM scroll compressors have been
designed and tested to ensure that gas pulsation
has been minimized for the most commonly
encountered refrigeration pressure ratio. On
installations where the pressure ratio lies beyond
the typical range, testing should be conducted
under all expected conditions and operating
In addition, it is extremely important that the
frame supporting the mounted compressor be
of sufficient mass and stiffness to help dampen
any residual vibration potentially transmitted to
the frame. The tubing should be designed so as
to both reduce the transmission of vibrations to
other structures and withstand vibration without
incurring any damage. Tubing should also be
designed for three-dimensional flexibility. For
more information on piping design, please see
the section entitled "Essential piping design
considerations".
configurations to ensure that minimum gas
pulsation is present. If an unacceptable level
is identified, a discharge muffler with the
appropriate resonant volume and mass should
be installed. This information can be obtained
from the component manufacturer.
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FRCC.PC.015.A8.02