26 September 2006
APPENDIX C PROCEDURE FOR DETERMINING FIRE FLOW DEMAND FOR
Use the following procedures to determine the required fire flow demand and
duration for buildings that are not fully sprinklered.
Step One - Determine the Classification of Occupancy.
Appendix B lists the classifications of occupancy hazard as Light, Ordinary Group
1, Ordinary Group 2, and Extra.
Step Two - Determine the Water Demand Weighted Factors.
The table is divided into three weighted value categories for fire flow and duration
in each occupancy classification. These categories are determined from the
values established in the six factors discussed below. The final value is
determined by adding the values obtained from all six factors. See sample
calculations in Appendix C, par. 1-d.
The six factors to be assigned weighted values are as follows:
Response Time by Fire Department.
Most installations have on-site fire departments that are familiar with hazards of
buildings within the facility. The longer the response time for manual firefighting,
the greater the water demand and duration. Traffic flow is a factor and traffic
congestion is equivalent to a longer response distance. The fire department
response weighing factors are as follows:
Type Of Fire Department Response
On-Site (within 1.6 km (1 mile))
On-Site (over 1.6 km (1 mile) but less than 4.8 km (3 miles))
On-Site (4.8 km (3 miles) or greater)
Off-Site (less than 3.2 km (2 miles))
Off-Site (3.2 km (2 miles) or greater)
Type of Construction.
Paragraph 2-1.3 requires that type of construction comply with the IBC. As
structural fire integrity is reduced, water demand and duration will become