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 .

Cryogen:	Select a Cryogen 1,1-Difluoroethylene Acetylene Argon Boron Trifluoride Carbon Dioxide Carbon Monoxide Chlorotrifluoromethane Ethane Ethylene Fluorine Fluoroform Helium-3 Helium-4 Hydrogen Deuterium Tritium Hydrogen Chloride Krypton Methane Neon Nitrogen Nitrous oxide Oxygen Ozone Tetrafluoromethane Xenon
System Complexity:	Select a System Complexity Dewar (or Detector) Only Dewar and Simple Manifold (w/Relief valve) Dewar and Transfer Line (Bayonet Connection) Dewar and Complex Manifold (Bayonet Connection) Other
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:	Yes No
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: