Chemical Engineering @ Carnegie Mellon

Andrew J. Gellman Group S.O.P.

Handling liquid nitrogen

  1. Liquid nitrogen is extremely cold (-320°F, -196°C, 77K) and can cause severe frostbite.
  2. Always use gloves and face protection when handling liquid nitrogen. Loose-fitting long sleeve clothing is recommended.
  3. Never use liquid nitrogen in a confined space. An oxygen-deficient atmosphere may occur.
  4. In case of skin contact, rinse with plenty of water. Do not remove clothes. Seek medical attention.
  5. In case of eye contact, rinse with plenty of water. Seek medical attention.
  6. In case of a major liquid spill, evacuate all personnel from the affected area. Do not enter the affected area without a self-contained breathing apparatus. Respirators WILL NOT function in an oxygen-deficient atmosphere.
Transfer from tank to dewar
  1. Place dewar under dispensing line.
  2. Open valve on tank slowly.
  3. Fill dewar slowly. Never fill completely to the top.
  4. Replace foam cap on dewar.
Transfer from dewar to equipment
  1. Remove foam cap from dewar.
  2. Pour slowly into equipment, using a funnel if necessary.
  3. Replace foam cap on dewar when not in use.

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