How does one calculate tank separation distances for groups of tanks larger than 2 x 2 in accordance with NFPA? Say if I have a grid of 3 x 3 storage tanks, all floating roof, all flammable for the sake of this question. Is it one uniform tank distance calculated by summing every possible adjacent tank diameter combinations and dividing by 6? It seems like the number will be excessively large if I follow the methodology as described for 2 tanks by 2 tanks as explained in the NFPA 30 handbook. Thank you for your assistance.
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