manni-yunk
Contributor
Its the concentration that is material, that will cause a blow out ie explosion. Assisting factors for fire are pressure (ie constant flow), restrictions, adiabatic heating, blocking debris, poor gear design (ie tight bends) and such...Obviously a fast fire in your face is as good as an explosion Id think.
Obviously the concentration is the main concern, But I dont think you can dismiss pressure as immaterial. Arent there less concerns at LP ratings, than at high pressure ratings when it comes to 100% o2?