Operating manual- SAB 355 (including ATEX)
004059 en 2019.11
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Identification
3.5 Labelling of explosion-proof equipment
ATEX:
The compressor area of application is indicated next to the Ex-sign on the name plate.
II 2 G T3/T4
II
Material group:
II indicates that the equipment is suitable for use in industrial areas above ground.
2
Material category:
2 indicates that the equipment is suitable for use in areas with possible occurrence of ex-
plosive gasses.
G
Hazardous environment:
G indicates that the equipment is suitable for use in potentially explosive gas, vapour
and fog atmospheres.
T3/T4
Temperature class:
indicates the surface temperatures that may occur on the compressor.
Warning!
On ATEX-executions, the limits in Table 2 must always be respected.
Temp. class Max. surface
temp.
Max. temperature of oil to
shaft seal
Min. ignition temperature
of oil
T1 450°C 380°C 500°C
T2 300°C 230°C 350°C
T3 200°C 130°C 250°C
T4
135°C 65°C 185°C
T5
100°C 30°C 150°C
T6 85°C 15°C 135°C
Table 2: Temperature classes - screw compressors
3.6 Geometrical swept volume
Screw com-
pressor unit
Rotor
dia.
mm
Rotor
L/D
Min.
Speed
rpm
Max.
Speed
rpm
Geometrical
swept volume
drive shaft end
Ft
3
/Rev.
M
3
/Rev.
M
3
/H
2950 rpm
SGCH/B 3511
355 1.1
1,000 3,600
0.82248 0.023276
4,120
SGCH/B 3515
355 1.5
1,000 3,600
1.12154 0.031739
5,618
SGCH/B 3519
355 1.9
1,000 3,600
1.42748 0.040398
7,150
SGCB 3524 355 2.4
1,000 3,600
1.80328 0.051033
9,033
Table 3: Geometrical swept volume
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