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Hazard Evaluation Tools

Oxygen Deficiency Hazard - Cryogens

April 13, 2010 - Revision 4

This page provides an evaluator a tool to aid in the performance and documentation of an Oxygen Deficiency Hazard Calculation as required by the SBMS Subject Area, Oxygen Deficiency Hazards (ODH), System Classification and Controls .

ODH Cryogen Tool Instructions
Characteristics of Cryogenic and Low Temperature Fluids
ODH Classification Table
System Complexity:
Failure Rate:
Expansion Ratio:
Dewar Volume (liters):
Free Room Volume (ft3) - V: Calculate
Minimum Oxygen Concentration without Ventilation:
ODH fatality rate (per hour) F - No Ventilation:
ODH Class - No Ventilation:
If ventilation is used and/or Leak Rate is known:
Minimum Room Ventilation Rate (ft3/min) - Q:
Ventilation Draws In Fresh Air:
Leak Rate (ft3/min) - R: Typical Leak Rates Table
Maximum Leak Time (min):
Oxygen Concentration at End of Leak:
Safe Re-enter Time (min):
ODH fatality rate (per hour) F - With Ventilation:
ODH Class - With Ventilation:
If you have any questions regarding this subject matter contact: SEG SME
Last Modified: Monday, August 08, 2011 12:24 PM Please forward all questions about this site to: SEG Admin
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