While I don't have a specific OSHA standard for outdoor gas cylinder storage, here's some general guidance based on the documents you provided:

• General Requirements: Ensure compressed gas in a container is used, stored, and handled adequately [1]. The Compressed Gas Association (CGA) standard CGA P-1, "Safe Handling of Compressed Gases in Containers" indicates the required standard of reasonable care [1].
• Cylinder Condition: Conduct visual inspections of compressed gas cylinders to ensure they are in safe condition [2]. Inspections should align with Department of Transportation (DOT) Hazardous Materials Regulations (49 CFR Parts 171-179 and 14 CFR Part 103) and CGA Pamphlet C-6 [2].
• Protection: Protect cylinders from corrosion [3], falling, and having objects fall on them [4].
• Location: Store oxygen and fuel gas cylinders in locations that are specifically assigned and well-ventilated [3]. Avoid prolonged exposure to damp environments and keep away from heat sources [3].
• Safety: Post signs prohibiting smoking and open flames within 20 feet of the storage area [3]. Ensure the temperature does not exceed 125°F (52°C) [3].
• Separation: Separate oxygen cylinders from fuel-gas cylinders or combustible materials by a minimum distance of 20 feet or by a noncombustible barrier at least 5 feet high with a fire-resistance rating of at least one-half hour [5].
• Securing: Secure cylinders to prevent movement and keep them valve end up [6].
• Ventilation: Ensure solid-walled storage compartments have vents with a minimum of 0.18 square meters of free area for every 0.42 cubic meters of compartment volume, split evenly between the top and bottom surfaces [7].