Johnson Controls SAB 355 - Page 6

Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
4. Technical description ................................................................... 35
4.1 Description of the compressor .............................................. 35
4.1.1 Marine application .......................................................... 37
4.1.2 Description of main components and systems.............. 38
4.1.3 Control system ............................................................... 38
4.1.4 Compressor .................................................................... 39
4.1.5 Variable speed drive (VSD) ............................................ 41
4.1.6 Suction filter with built-in non-return valve .................. 42
4.1.7 Compressor lubrication system ..................................... 42
4.1.8 No pump oil system........................................................ 43
4.1.9 Demand pump oil system .............................................. 43
4.1.10 Flow security................................................................... 43
4.1.11 Compressor oil separation system ................................ 43
4.1.12 Automatic oil return valve.............................................. 47
4.1.13 External oil filter ............................................................. 48
4.1.14 Unit with double oil filter ................................................ 48
4.1.15 Compressor hydraulic system ....................................... 49
4.1.16 Compressor oil cooling systems .................................... 50
4.1.17 Suction check valve by-pass.......................................... 52
4.1.18 Requirements for ambient temperatures and
humidity
.......................................................................... 54
4.1.19 Balance piston pressure regulator................................. 55
4.1.20 Oil carry-over to plant .................................................... 56
4.1.21 Selecting lubricating oil for Sabroe screw
compressors
................................................................... 57
4.1.22 Oil charge........................................................................ 57
4.1.23 Heating rod element for oil heating, pos. 30 ................. 57
4.1.24 Oil level switch................................................................ 58
4.1.25 Cold-start system........................................................... 58
4.1.26 Compressor protecting system, pos. 220 and
221
.................................................................................. 59
4.1.27 Oil cooling system and general piping layout................ 60
4.1.28 Liquid injection oil cooling.............................................. 61
4.1.29 Thermosyphon oil cooling .............................................. 62
4.1.30 Water-cooled oil cooling................................................. 64
4.1.31 KRACHT oil pump............................................................ 64
4.1.32 Economiser, high-stage (optional) ................................ 66
4.1.33 General key to piping diagram....................................... 69
4.1.34 General piping diagram.................................................. 71
4.1.35 General key to piping diagram - continued ................... 72
4.1.36 Instrumentation ............................................................. 73