Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Technical description
Fig. 38: Level control method
Liquid line sizes and the additional receiver volume (quantity of refrigerant required for 5 minutes
of liquid injection oil cooling) are given in Table 6.
Compressor
unit
Piping
line size
Pound per
min.
per 5 min.
Kg per min.
per 5 min.
Liquid
volume
cu ft
Liquid
volume
liter
R717 HS*
SAB 355 S 3 305.0 138.4 8.3 235.0
SAB 355 L
4 417.0 189.2 11.4
322.8
SAB 355 E
4
532.0 241.3 14.5 410.6
R717 Booster*
SAB 355 S
1
1
/
2
38.5 17.5 0.9 25.5
SAB 355 L 2 54.0 24.5 1.3 36.8
SAB 355 E 2 69.5 31.5 1.7 48.1
SAB 355 X 2 91.5 41.5 2.2 62.3
R507 HS*
SAB 355 S
2
1
/
2
878.5 398.5
14.1 399.3
SAB 355 L 3 1200.0 544.3 19.3 546.5
SAB 355 E 3 1243.0 563.8 20.0 566.3
R507 Booster*
SAB 355 S 1 103.0 46.7 1.7 48.1
SAB 355 L
1
1
/
4
141.5 64.2 2.3 65.1
SAB 355 E
1
1
/
4
160.0 72.6 2.6 73.6
SAB 355 X 2 336.0 152.4
5.4
152.9
Table 6: * Based on 100 foot liquid line. For longer runs, increase line size accordingly.
Conditions
Booster:
Evaporating: -40°C [-40°F]
Condensing: 35°C [95°F]
Intermediate: -12.2°C [10°F].
HI stage:
Evaporating: -17.8°C [-17.8]
Condensing: 35°C [95°F].
4.1.29 Thermosyphon oil cooling
Thermosyphon oil coolers, like water (or glycol)-cooled oil coolers, eliminate the capacity and
power penalties associated with liquid injection oil cooling. Thermosyphon oil coolers have the
further advantages of eliminating water (or glycol) pump power consumption and maintenance,
fouling and potential system contamination.
To evaporator
From condenserKing valve
Low level
floa
t switch
To compressor
oil c
ooling system
Locate to provide
5 min. liquid supply
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