Low-piled storage versus design /area method: I notice a quite huge difference about requirements of NFPA 13 for using low-piled storage where where is no limitation for area and the method when the virtual storage height is used to determine according to the clearance the area / density method.
For example we can have a building with a high clearance with Group A plastic storage as low-piled at 5-feet (1.3 m). Using the low-piled method, you need Ordinary Hazard Group 2 0.20 gpm/sqft @ 1,500 sqft (7.5 l/min/m² @ 210 m²) when using ara /density method, but with the virtual height you need more than 0.73 gpm/sqft (30 l/min/m² @ 230 m²). In my example, the area of low piled storage is a very huge area 170,000 sqft (10,000 m²).
What is the actual criteria? Thanks for your comments.
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