Johnson Controls SAB 355 - Calculation of Centre of Gravity, Support Reactions and Tipping Angle

Engineering manual - SAB 355 Screw compressor unit (including ATEX)
104/156
004100 en 2020.10
Installation instructions
7.26 Calculation of centre of gravity, support reactions and tipping angle
Principle: Choose the ‘component placement’ list that corresponds the most to the unit you want
to calculate. Normally, this will be the one with the same oil separator. Check if some of the heavy
components differ significantly in weight and size (influence of the part's centre of gravity). Usu-
ally, only the electric motor, compressor and oil cooler are relevant. Recalculate the table with the
new values and follow the example to find the new support reactions.
Selection of vibration dampers
When you have calculated the support reactions, you can select the right vibration dampers from
Table 26 and Table 27.
Calculation of vibration dampers
SAB 355 L
OHU 6042
Mi
Kg
Xi
mm
Yi
mm
Zi
mm
Mi*Xi
kg.mm
Mi*Yi
kg.mm
Mi*Zi
kg.mm
Compressor SAB 355 L
4207 3532 173 1990 14859124 727811 8371930
Oil separator
OHU 6042/5030
3100 1952 0 715 6051200 0 2216500
Discharge manifold
200 2100 750 1450 420000 150000 290000
Oil cooler 180 2950 900 640 531000 162000 115200
Oil filter, double
including pipes
300 610 900 600 183000 270000 180000
Suction filter 410 3925 125 3186 1609250 51250 1306260
Suction stop valve
208 3925 -452 3186 816400 -94016 662688
Base frames 1 127 89 72 1722 11303 9144 218694
Base frames 2 127 1521 72 1722 193167 9144 218694
Base frames 3 177 2800 101 1761 495600 17877 311697
Base frames 4 128 3726 87 1751 476928 11136 224128
Oil pump
50 2400 1027 658 120000 51350 32900
Motor IEC 560 7600 873 0 2100 6634800 0 15960000
Oil 600 1952 -400 600 1171200 -240000 360000
Total 17414 33572972 1125696 30468691
Table 18: Component placement example
XG YG ZG
mm mm mm
1928 65 1750
Table 19: Centre of gravity
Mt L
c b z
Kg
mm mm mm mm
17414
3904 635 1400 1976
Table 20: Dimensions
F1 F3
Kg Kg
4814 4697
F2 F4
Kg Kg
4000 3903
Table 21: Forces
Mi * Xi
tot
Mt
33572972
17414
=
1928 mm
C =
b
2
-
YG
F
1
= 17414 *
1976
3904
*
1400 - 635
1400
=
4814