Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Installation instructions
7.28 Mounting of series 52 coupling
Series 52 is a coupling of the flexible disc type which is torsionally stable and 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.
Fig. 77: Mounting procedure
Coupling size
Lock nut C
mm
E
mm
Thread size
Torque (Nm)
375
9/16”
176 178 0-40
450
11/16”
203 178 0-25 *
Table 29: Mounting measurements
* For service factor minimum 1.5 with max. torque.
• Before mounting the coupling on the compressor shaft, clean the coupling flange, the indi-
vidual parts in the bushing and the rotor shaft.
Next, lubricate all parts with a little refrigerant machine oil. Do not lubricate with Molyb-
dändisulfid, high-pressure oil or grease.
It is recommended to press on the coupling flange on the motor by means of a threaded
rod with nut ans tightening bar.
Do not strike the coupling flange as this may cause damage to the bearings.
Fasten coupling flange to the motor and compressor shafts with pointed screw and tongue
connection.
If the coupling is delivered without boring because the motor type is unknown at the time of de-
livery, the coupling flange must be balanced according to VDI 2060 Q 6.3 to a max. of 3600 rpm
without tongue, but with the pointed screw.
Dismantling of coupling
On dismantling the coupling, it is important to note the position of bolts, washers and nuts as they
must be refitted in the same order. Tie a string or a piece of thread through one of the bolt holes in
the coupling discs in order to avoid that the plates are turned in relation to each other and to the
flange.
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