GEA Grasso M-Series Operating Manual page 49

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
Hint!
For specific operations the selection
and evaluation will take place within
the manufacturer's compressor selec-
tion programme.
Maximum permitted pressure
Pressure ratio p / p
0
Pressure difference (p - p
Suction temperature t
0
Discharge temperature (compressor outlet)
Compressor frame size
max. Drive power (kW)
**)
max. Nominal torque
max. permissible speed
min. permissible speed
*)
For type M/N, the compressor drive shaft ends are different for 28 bar and 52 bar versions.
**)
When running the compressor, the maximum torque falls by 25% as opposed to electrical drives.
Hint!
All of the following requirements must
be observed!
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
)
0
(compressor inlet)
50 Hz
60 Hz
Nm
-1
min
-1
min
Caution!
To avoid "zero flow" in the compres-
sor, which can damage the compres-
sor, the minimum control slide posi-
tion in the manufacturer's compressor
selection programme must be adhered
to.
"Minimal control slide position <value>
% accepted start."
If the value entered is "> 0", then a lim-
itation of the control slide path must
be put in place in coordination with the
manufacturer. The path limitation can
be set created mechanically with a
stop sleeve or by installing virtual con-
trols (virtual stop sleeve) on the com-
pressor.
p bar g.
π -
Δp bar
t
°C
0h
t
°C
e
H L
300 300
360 360
960 960
4500 4500
1000 1000
1. Compressors for a discharge pressure up to 52
bar (currently not available) are equipped with
housings made of a material of higher strength
and are fitted with special components.
Description of Design and Function
≤28 bar
max. or
≤52 bar
min. > 1.5
min. > 0.8
min. > - 60
max. < 120
*) *)
M/N M/N
28 bar 52 bar
300 530
360 640
960 1700
4500 4500
1000 1000
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