Fire Flow Construction Estimate Form - Henrico County Dpu
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1HENRICO COUNTY DPU
FIRE FLOW ESTIMATE FORM
Insurance Services Office (ISO) Method
Needed Fire Flow (NFF)
PROJECT NAME: ______________________________________________________________
NON-SPRINKLERED or PARTIALLY SPRINKLERED
TYPE OF CONSTRUCTION
___________________________________________
TYPE OF OCCUPANCY
___________________________________________
Ground Floor Area (sq. ft)
___________ Number of Stories
_________
(A
) = Effective Floor Area
_________
i
F = construction class coefficient from Table 1-2
_________
(O
) = Occupancy Factor from Table 1-3
_________
i
(X + P)
= 1 + SUM(X
+ P
)
_________
i
i
i
i=1→n
X
= Exposure Factor from Table 1-4
_________
i
P
= Communication Factor from Table 1-5
_________
i
0.5
Calculate Construction Factor (C
)
C
= 18 * (F) * (A
)
______________
i
i
i
NFF = (C
) * (O
) * (X + P)
Calculate NFF
______________
i
i
i
• Round C
to nearest 250
i
• Round NFF < 2500 to nearest 250 and NFF > 2500 to nearest 500
• Maximum (X + P)
= 1.60
i
FULLY SPRINKLERED BUILDINGS
NFPA HAZARD CLASSIFICATION: _____________________________________
INDICATE OPTION SELECTED FOR DETERMINATION OF NFF
Option 1: ____________
For Light, Ordinary Group 1 or Ordinary Group 2 Hazards
NFF = 1000 gpm
______________
For Extra Hazard Group 1
NFF = 2000 gpm
______________
For Extra Hazard Group 2
NFF = 2500 gpm
______________
• When high piled storage is present, Option 2 shall be used
Option 2: ___________
Sprinkler Requirement (Submit NFPA Calculations)
_________________
Hose Stream Allowance (from Table 5-1)
_________________
NFF = Sprinkler Requirement + Hose Stream Allowance
______________
Fire Hydrants Required
______________
I CERTIFY THAT THE ABOVE INFORMATION IS TRUE AND CORRECT.
ENGINEER:
____________________________________________________________
SIGNATURE: ____________________________________________________________ , P.E.
Form F-9
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