Non-flammable gases do not have a flammable range at 14.7 PSIA with air of at least what percentage?

The statement about non-flammable gases is based on their ability to support combustion or their potential to form a flammable mixture with air. A gas is considered non-flammable if it does not contribute to combustion at specific concentrations and conditions. At standard atmospheric pressure, a non-flammable gas remains classified as such if it does not create a flammable range in the presence of air.

For non-flammable gases, it is established that they typically have a safe upper limit of mixture concentration with air, beyond which they do not pose a risk of combustion. The 12 percent threshold is significant because gases exceeding this percentage in combination with air will not create a flammable atmosphere. In contrast, values above or below this percentage might still pose a risk depending on the specific characteristics of the gas and the surrounding environment.

Thus, being trained to recognize that non-flammable gases do not present a flammability risk when present at least at the 12 percent concentration point allows you to make informed decisions when handling such materials. This understanding is essential for safety in environments where non-flammable gases might be used, stored, or transported.