Flammable Liquid Cabinet Storage (OSHA 1926.152(b))
Everyone knows the per-cabinet rule -- 60 gal of Category 1/2/3 or 120 gal of Category 4 in any one cabinet. The rule that actually decides a jobsite is the second sentence: not more than THREE such cabinets in a single storage area. That is a hard ceiling of 180 gal, and you cannot buy your way past it with a fourth cabinet -- past it you need a genuinely separate area or a specially constructed inside storage room, which is a building problem rather than a purchasing one, and far cheaper to discover at planning than at inspection. The standard gives no blending rule for a cabinet holding both category groups, so the conservative read used here is the LARGER of the two counts, not a sum. Naming note: GHS Categories 1-3 are the old Class I and II; Category 4 is Class III.
Formula and source
cabinets for Category 1-3 = ceil(gallons / 60); cabinets for Category 4 = ceil(gallons / 120); cabinets needed = the larger of the two, since the standard states a limit for each rather than a blending rule; the area ceiling is 3 cabinets, so 180 gal of Category 1-3 or 360 gal of Category 4 per storage area.
OSHA 29 CFR 1926.152(b)(3), a US federal regulation in the public domain, quoted directly. Quantities beyond what cabinets may hold go to specially constructed inside storage rooms under the same section.
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