Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2022.02
101/175
Technical data
6.15 Vibrations and test pressure levels
6.15.1 Vibration data for compressors (all compressor types)
Vibration data for Sabroe compressors comply with the following standards:
Reciprocating compressors:
• ISO 10816, Part 6, Annex A, group 4, AB which fixes the max. permissible operating vi-
brations at 17.8 mm/s.
Screw compressors:
• VDI 3836, Group 3, resilient (suspension type), Frequency range A. The limit stated
here is extended and applied to the attached motor.
The standard specifies a limit rms value of 10 mm/s for Zone I/II and a limit rms value of
15 mm/s for Zone II/III. Based on the design and decades of experience with it, the
evaluation criteria given for measured values belonging to Zone II is deemed as ac-
ceptable for rms values up to 11.2 mm/s. Measured values above 11.2 mm/s are
subject to the stated actions given by the VDI 3836 Zone II/III classification.
The measurements are made as illustrated in the figure below (points A-D).
Fig. 73: Vibration data
Pay attention to the following, however:
• Motors comply with EN 60034-14 (CEI/IEC 34-14) Class N.
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
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