A colorado based company proposes to have a 22.7 million gallon propane insulated tank. In the report, it is stated that locals will vote about the work on the project and describes about the facility, possible effects and measures. The report has some questions and some answers. It is an interesting article. I calculated fireball radius and its duration using the equations mentioned in "Major Hazard Control: A Practical Manual" published by ILO. The fireball radius is 803 m and its duration is 124 seconds. The impact distances for thermal radiation resulting from BLEVE/VCE extend much longer. It reminds me about the incident at New Mexico in the year 1984.
The owners must have taken suitable measures as per applicable NFPA and other regulations. Risk assessment of the proposed facility with its safety features, considering the presence of other manufacturing facilities and their impact will result in a meaningful conclusion.