MSHA - Code of Federal Regulations - 30 CFR 77.208
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MSHA -  Title 30 CFR
30 CFR § 77.208
Storage of materials.
(a) Materials shall be stored and stacked in a manner which minimizes stumbling or fall-of-material hazards.
(b) Materials that can create hazards if accidentally liberated from their containers shall be stored in a manner that minimizes the dangers.
(c) Containers holding hazardous materials must be of a type approved for such use by recognized agencies.

(d) Compressed and liquid gas cylinders shall be secured in a safe manner.
(e) Valves on compressed gas cylinders shall be protected by covers when being transported or stored, and by a safe location when the cylinders are in use.