Watches, rings, and other jewelry should not be worn. All rooms were cryogenic liquids are used, must have an oxygen sensor. Storage and Handling Guidelines Containers and systems containing cryogens should have pressure relief mechanisms. Containers and systems should be capable of withstanding extreme cold without becoming brittle. Do not transfer any cryogenic liquid into a nonapproved container.
Adequate ventilation is required when using liquid nitrogen or helium.
Oxygen can be condensed out of the atmosphere creating a potential explosive situation. Also, oxygen can be displaced from the atmosphere causing an oxygen deficiency resulting in asphyxiation. Never ride on the elevator when transporting a cryogenic liquid. The flashpoint is defined as the minimum temperature at which a liquid gives off vapor in sufficient concentration to form an ignitable mixture with air near the surface of the liquid. The size and number of such containers will be kept to a minimum.