Dewars and pressurized vessels specifically designed for the storage of liquid nitrogen, are to be used exclusively.
All liquid nitrogen containers should be stored:
- in a stable manner and on a sturdy surface; and
- in a position that does not restrict access and egress; and
- in a position where they are unlikely to be knocked by persons or other equipment; and
- in a well ventilated location proportional to the volume stored.
The quantity of liquid nitrogen permitted to be stored in an area depends on the volume and ventilation of the area. They should never be stored in an office. The minimum acceptable concentration of oxygen in a room’s atmosphere is 18 percent. However, the goal should be to maintain oxygen concentrations above 19.5%.
The risk of asphyxia must be assessed wherever liquid nitrogen is used or stored.