For the purpose of segregating empty and full cylinders the facility should establish a level of where this delineation would be made.
Compressed gas cylinder storage nfpa.
Section 6 16 of nfpa 55 states that indoor storage and use areas and storage buildings for compressed gases and cryogenic fluids are to be provided with mechanical exhaust ventilation or natural ventilation where natural ventilation can be shown to be acceptable for the material as stored.
Nfpa 99 does not define the point where a cylinder is considered empty.
All storage requirements are based on the total volume of gas in cylinders being stored.
Because of this nfpa guidelines require that all compressed gas cylinders of all sizes are restrained securely at all times so that they don t fall or tip over.
Compressed gas cylinders can store flammable gases like acetylene and inert gases like helium.