About this appendix: Appendix C focuses on the location and spacing of fire hydrants, which is important to the success of fire-fighting operations. The difficulty with determining the spacing of fire hydrants is that every situation is unique and has unique challenges. Finding one methodology for determining hydrant spacing is difficult. This particular appendix gives one methodology based on the required fire flow that fire departments can work with to set a policy for hydrant distribution around new buildings and facilities in conjunction with Section 507.5.
The number of fire hydrants available to a building shall be not less than the minimum specified in Table C102.1.
REQUIRED NUMBER AND SPACING OF FIRE HYDRANTSh
BETWEEN HYDRANTSa, b, c, f, g
|MAXIMUM DISTANCE FROM ANY|
POINT ON STREET OR ROAD
FRONTAGE TO A HYDRANTd, f, g
|1,750 or less||1||500||250|
|7,001 or more||8 or moree||200||120|
For SI: 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m.
- Reduce by 100 feet for dead-end streets or roads.
- Where streets are provided with median dividers that cannot be crossed by fire fighters pulling hose lines, or where arterial streets are provided with four or more traffic lanes and have a traffic count of more than 30,000 vehicles per day, hydrant spacing shall average 500 feet on each side of the street and be arranged on an alternating basis.
- Where new water mains are extended along streets where hydrants are not needed for protection of structures or similar fire problems, fire hydrants shall be provided at spacing not to exceed 1,000 feet to provide for transportation hazards.
- Reduce by 50 feet for dead-end streets or roads.
- One hydrant for each 1,000 gallons per minute or fraction thereof.
- A 50-percent spacing increase shall be permitted where the building is equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1 of the International Fire Code.
- A 25-percent spacing increase shall be permitted where the building is equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.2 or 903.3.1.3 of the International Fire Code or Section P2904 of the International Residential Code.
- The fire code official is authorized to modify the location, number and distribution of fire hydrants based on site-specific constraints and hazards.