Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2022.02
4. Technical description .......................................................................... 36
4.1 Description of the screw compressor ........................................... 36
4.2 Marine application...................................................................... 38
4.3 Description of main components and systems.............................. 39
4.4 Control system .......................................................................... 39
4.5 Compressor .............................................................................. 40
4.6 Variable speed drive (VSD)......................................................... 42
4.7 Compressor lubrication system ................................................... 42
4.8 Oil injection valve....................................................................... 43
4.9 No pump oil system.................................................................... 43
4.10 Demand pump oil system ........................................................... 43
4.11 Flow security ............................................................................. 43
4.12 Compressor oil separation system............................................... 43
4.13 Automatic oil return valve ........................................................... 46
4.14 External oil filter ......................................................................... 47
4.15 Unit with double oil filter.............................................................. 48
4.16 Compressor hydraulic system ..................................................... 48
4.17 Compressor oil cooling systems .................................................. 50
4.18 Suction check valve by-pass ....................................................... 51
4.19 Requirements for ambient temperatures and humidity .................. 53
4.20 Oil carry-over to plant ................................................................. 54
4.21 Selecting lubricating oil for Sabroe screw compressors ................. 55
4.22 Oil charge.................................................................................. 55
4.23 Heating rod element for oil heating, pos. 30.................................. 55
4.24 Oil level switch........................................................................... 56
4.25 Cold-start system....................................................................... 56
4.26 Compressor protecting system, pos. 220 and 221 ........................ 58
4.27 Oil cooling system and general piping layout ................................ 59
4.28 Liquid injection oil cooling ........................................................... 59
4.29 Thermosyphon oil cooling........................................................... 61
4.30 Water-cooled oil cooling ............................................................. 63
4.31 Connection to AlfaNova oil cooler................................................ 65
4.32 KRACHT oil pump...................................................................... 66
4.33 Economiser, high-stage (optional) ............................................... 67
4.34 General piping diagram .............................................................. 71
4.35 Key to piping diagram................................................................. 74
4.36 Instrumentation.......................................................................... 76
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