Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Technical data
6.12 Series 52 coupling
Series 52 is a coupling of the flexible disc type which is torsionally stable does not as such cause
any torsional fluctuations between motor and compressor.
The flexible discs and the intermediate section provide the coupling with the necessary radial and
axial flexibility to absorb the minor radial and axial displacement between motor and compressor.
Such displacement occurs as a consequence of the heat and power impacts during operation.
Chapter 7. Installation instructions describes in detail the procedures for alignment of coupling.
For coupling data, see section 7.28 Mounting of series 52 coupling.
6.13 Noise data
Noise data is stated in:
SWL:
A-weighted sound power level
SPL:
A-weighted sound pressure level, in free field over reflecting plane (1 m distance).
• Noise data is based on measurements according to ISO 9614-2.
• The stated SPL values are calculated using the formula 8.3 in ISO 3744.
• The stated values are for a complete unit operating in 100% capacity.
6.14 Noise data for SAB 355
Evaporating temperature, TE -15°C
Condensing temperature, TC
+35°C
Refrigerant R717/HCFC/HFC
Speed
2950 rpm
For 60 Hz-driven compressors, add +2 dBA to the stated levels.
Type of unit
SWL SPL
SAB 355 S 112 89
SAB 355 L 112 89
SAB 355 E 112 89
SAB 355 X 112 89
Table 16: Noise data
Noise data for other operating conditions can be provided by Johnson Controls Denmark on
request.
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