I'm trying to retrofit an existing fire sprinkler system in a storage warehouse that will be storing mostly motor, transmission and hydraulic oil in 5 gallon plastic containers. The maximum storage height is 16'-6' and the ceiling height is 20'-6". I'm following NFPA 30 for the design criteria and found that Scheme A needs to be used for this type of commodity unless someone thinks otherwise. This Scheme prescribes the location of in rack sprinklers and the required density for ceiling sprinklers. It also states that barriers are needed at different levels. I want to avoid using in rack sprinklers in the retrofit due to the additional cost. Is there a section on any of the NFPA 13, NFPA 30 or other that states the limits on when you must use in rack sprinklers and when they are not needed? The only one I found is that when using ESFR sprinklers heads and a building height of less than 45 ft, in rack sprinklers are not required. I don't think the existing piping and water available can support the large volumes of water required by the ESFR sprinklers. Any suggestions will be appreciated.
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