Its 2017 and we still debate the flammability of anhydrous ammonia (NH3). It is a fact that NH3 is not classified as a “flammable gas” due to its high Lower Explosive Limit (16%) and it’s flammable range being less than 12 percentage points. But there is one other fact that we seem to lose sight of… NH3 has an LEL and it will burn! Here is a 2013 OSHA fatality that involved a flash fire with anhydrous ammonia while “draining oil” from the system aboard a fishing vessel…