Product description 2.2 Operating principle of compressor
Page 20 Operating instructions for S 40-3...S 150-3 series screw compressors
Technical Data SF 60-3...SF 150-3, part 2
2.2 Operating principle of compressor
Functional principle of
the air end
The air end operates according to the displacement principle. In the housing,
the main and secondary rotors are driven by means of an electric motor and
V-belts.
Type SF 60-3 SF 100-3 SF 150-3
Oil filling quantity
Oil receiver volume [gallon] 12.15 18.76 31.70
Total oil filling quantity [gallon] 7.40 11.10 17.17
Oil topping up quantity
between min. + max. [gallon] 1.59 2.11 2.64
Intake air temperature
– min. [°F] + 41 + 41 + 41
– max. [°F] + 104 + 104 + 104
Air cool-
Cooling air requirement
– free-standing installation [cfm] 7651 10830 18834
– with supply and exhaust duct [cfm] 3825 5415 9417
- free fan pressure [Pa] 60 60 60
Water cooling
Cooling air requirement
– free-standing installation [cfm] 1200 1200 2000
with supply and exhaust duct [cfm] 600 600 1000
Required cooling water quantity
– delta t = 15 K [cfm] 1.44 2.41 3.53
– delta t = 30 K [cfm] 0.72 1.20 1.77
Max. cooling water quantity [cfm] 2.1 2.5 5.3
Cooling water inlet temperature
– min. [°F] + 41 + 41 + 41
– max. [°F] + 86 + 86 + 86
Cooling water outlet temperature
– max. [°F] + 113 + 113 + 113
Cooling water pressure
– min. [psig] 30 30 30
– max. [psig] 145 145 145
Operating pressure transmitter
1)
1)
Compressors for other operating pressures p
min
= p
max
– 7 psig.
(factory settings)
– p
max
= 100 psig: Switch-off press. p
max
[psig]
100 100 100
Switch-on press. p
min
[psig]
93 93 93
– p
max
= 115 psig: Switch-off press. p
max
[psig]
115 115 115
Switch-on press. p
min
[psig]
108 108 108
– p
max
= 125 psig: Switch-off press. p
max
[psig]
125 125 125
Switch-on press. p
min
[psig]
118 118 118
– p
max
= 150 psig: Switch-off press. p
max
[psig]
150 150 150
Switch-on press. p
min
[psig]
143 143 143
– p
max
= 190 psig: Switch-off press. p
max
[psig]
190 190 190
Switch-on press. p
min
[psig]
183 183 183
Safety valve
Activation pressure at:
– p
max
= 100 psig [psig]
160 160 160
– p
max
= 115 psig [psig]
160 160 160
– p
max
= 125 psig [psig]
160 160 160
– p
max
= 150 psig [psig]
160 160 160
– p
max
= 190 psig [psig]
203 203 203
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