Non-flammable gases are considered non-ignitable at 14.7 PSIA with a mixture of what percentage or less?

Non-flammable gases are classified based on their ability to ignite when mixed with air. A gas is deemed non-ignitable if it does not form a mixture with air that can sustain combustion or explosion at a specific pressure level. At 14.7 PSIA (standard atmospheric pressure), non-flammable gases can have a maximum concentration of 13 percent in air without becoming ignitable. This threshold is critical for safety considerations in environments where these gases are stored or used, ensuring they do not present a fire hazard.

The 13 percent limit allows for a safe margin below which the risk of ignition remains extremely low. It is essential for those working with non-flammable gases to understand these concentration levels to maintain safe working conditions and adhere to regulatory standards. Hence, selecting 13 percent aligns perfectly with the definitions and thresholds set forth in safety regulations concerning non-flammable gases.