User Manual

A white paper issued by Siemens  September 2015

Content

1 Disruptions to hard disk drives caused by inert gas extinguishing systems ..................... 3

1.1 What can disrupt hard disk drives? ............................................................................... 4

1.1.1 Pressure .................................................................................................................. 4

1.1.2 Temperature ........................................................................................................... 6

1.1.3 Noise ...................................................................................................................... 6

1.1.4 Vibration/structure-born sound ............................................................................... 7

1.2 Conclusion drawn from the analyzed potential disturbance variables of pressure,

temperature, noise and vibration/structure-born sound ............................................... 8

1.3 Are the laboratory results transferable to actual installations? ..................................... 9

1.4 Cause analysis ........................................................................................................... 10

2 Silent Extinguishing – an holistic approach ................................................................. 13

2.1 Extinguishing agent selection .................................................................................... 13

2.2 Silent Nozzle ............................................................................................................. 14

2.2.1 Application with inert gas extinguishing systems .................................................. 18

2.3 Operational precautions ............................................................................................ 20

3 Questions and answers................................................................................................. 21

3.1 Abbreviations ............................................................................................................ 25