water tanks-net capacity

[sofiapossemato]

I am sorry for this rookie question, but I can not find where the norm NFPA stablishes how to calculate the volume that the water tank for private fire protection should have.

I only found the "standard net capacity sizes" on the NFPA22, but I didn´t find any tips on how to determine the size.

Can anyone please help me to find it?

 

[LCREP]

NFPA 13 is where the details are located.

Sprinkler demand + inside hose streams + outside hydrants times the duration based on the occupancy. Light 30 min, Ordinary Haz 1 & 2 60 mins, Extra Haz 1 & 2 120 mins. Warehouses 120 mins, ESFR 60 mins.

Example

Light hazard .10/1500= 150 gpm plus 100 gpm hose = 250 gpm times 30 mins = 7,500 gallons. If no inside hose then deduct 100 gpm.

Hope this helps.

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