ISO 10440-2:2001
[Current]
Petroleum and natural gas industries — Rotary-type positive-displacement compressors — Part 2: Packaged air compressors (oil-free)
...2 Labyrinth type as airseal
Sealing between compressed air and atmosphere may be performed by means of a labyrinth seal...
...9 When specified for motor driven compressor units and units including gears, and for turbine driven
units, the vendor shall perform a torsional vibration analysis of the compressor driver unit...
...9, the vendor shall perform a transient torsional
vibration analysis for synchronous driven units...