Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2020.10
4. Technical description ................................................................... 34
4.1 Description of the screw compressor.................................... 34
4.2 Marine application ................................................................. 36
4.3 Description of main components and systems..................... 37
4.4 Control system ...................................................................... 37
4.5 Compressor ........................................................................... 38
4.6 Variable speed drive (VSD) ................................................... 39
4.7 Compressor lubrication system ............................................ 40
4.8 Oil injection valve .................................................................. 40
4.9 No pump oil system ............................................................... 41
4.10 Demand pump oil system...................................................... 41
4.11 Flow security.......................................................................... 41
4.12 Compressor oil separation system ....................................... 41
4.13 Automatic oil return valve..................................................... 44
4.14 External oil filter .................................................................... 45
4.15 Unit with double oil filter ....................................................... 46
4.16 Compressor hydraulic system .............................................. 46
4.17 Compressor oil cooling systems ........................................... 48
4.18 Suction check valve by-pass................................................. 49
4.19 Requirements for ambient temperatures and
humidity
................................................................................. 51
4.20 Oil carry-over to plant ........................................................... 52
4.21 Selecting lubricating oil for Sabroe screw
compressors
.......................................................................... 53
4.22 Oil charge............................................................................... 53
4.23 Heating rod element for oil heating, pos. 30 ........................ 53
4.24 Oil level switch....................................................................... 54
4.25 Cold-start system .................................................................. 54
4.26 Compressor protecting system, pos. 220 and 221 .............. 56
4.27 Oil cooling system and general piping layout ....................... 57
4.28 Liquid injection oil cooling ..................................................... 57
4.29 Thermosyphon oil cooling ..................................................... 59
4.30 Water-cooled oil cooling ........................................................ 61
4.31 Connection to AlfaNova oil cooler ......................................... 62
4.32 KRACHT oil pump ................................................................... 63
4.33 Economiser, high-stage (optional) ....................................... 64
4.34 General piping diagram......................................................... 68
4.35 Key to piping diagram ........................................................... 71
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