What is the required separation between oxygen and acetylene cylinders?

The correct required separation between oxygen and acetylene cylinders is 20 feet. This distance is crucial to ensure safety in environments where these gases are stored or used. Both oxygen and acetylene are highly flammable gases, and when stored in proximity, the risk of an explosion or fire increases significantly.

Oxygen supports combustion and can cause materials to ignite more easily, while acetylene is highly combustible. By maintaining a distance of at least 20 feet, you reduce the chances of a fire or explosive event occurring due to accidental leakage or exposure to heat sources. This separation distance is a standard safety practice as outlined in various safety regulations and guidelines for handling and storing these gases, highlighting its importance in ensuring a safe working environment for welders and those involved in cutting operations.

It is also relevant to note that the other options suggesting different distances may not comply with established safety standards, which emphasize the necessity of keeping a safe distance to prevent potential hazards.