The new means to analyze risks associated with flammable gases is their “burning velocity,” and the new limit is 10 cm/s. So I wanted to provide some real-world examples of what this looks like. So I asked AI to compare 10 cm/s flame front with the speed of a person walking and a jackrabbit.
OSHA defines a CAT 1B Flammable gas as:
Gases which meet the flammability criteria for Category 1A, but which are not pyrophoric, nor chemically unstable, and which have at least either:
(a) a lower flammability limit of more than 6% by volume in air; or
(b) a fundamental burning velocity of less than 10 cm/s.
Here is the breakdown: