Have you ever wondered where all the “separation distances” we see in OSHA Standards, NFPA Codes, Fire Codes, etc. come from? Who came up with them, what are they based on, etc.? All legitimate questions and you are NOT alone!! Many of these requirements have historical undocumented origins. Guidance, which may inform a sound technical basis for adjusting these distances, has been requested by NFPA Technical Committees. There are a number of methodologies in the literature, both risk and hazard-based, which are used in the chemical safety and process safety field that may be relevant to the calculation of these distances. The purpose of this project was to provide guidance to NFPA technical committees on methodologies to develop technically based separation/clearance distances for hazardous chemical storage/processes and their application to the chemical storage and processes. The specific focus of the project is those hazards within the scope of NFPA 400. CLICK HERE for the report (A MUST READ for those who work with hazardous material codes and standards)