Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Technical data
Additionally, for the following types of vibrations:
– non-loaded motor
– and/or first order vibration levels
– and/or 95+% pure axial direction levels
ISO 10816-3 is used.
• When placing the unit on the vibration dampers supplied by Johnson Controls Denmark
(additional), vibrations against the foundation are reduced by:
– 85-95% for screw compressor units
– 80% for reciprocating compressor units
• Higher vibration levels may occur if:
– the motor and compressor have not been aligned in accordance with
requirements.
– the compressor runs at an incorrect Vi ratio (screw compressors only).
– the piping connections have been executed in a way that makes them force pull or
push powers on the compressor unit, or transfer vibrations to the unit caused by
natural vibrations or connected machinery.
– the vibration dampers have not been fitted or loaded correctly as indicated in the
foundation drawing accompanying the order.
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