11.2.3 Water Demand Requirements — Hydraulic Calculation Methods
- Density/area curves of Figure 18.104.22.168.1 in accordance with the density/area method of 22.214.171.124
- The room that creates the greatest demand in accordance with the room design method of 126.96.36.199
- Special design areas in accordance with 188.8.131.52
FIGURE 184.108.40.206.1 Density/Area Curves.
Table 220.127.116.11.2 Hose Stream Allowance and Water Supply Duration Requirements for Hydraulically Calculated Systems
|Occupancy||Inside Hose||Total Combined Inside and Outside Hose||Duration (minutes)|
|Light hazard||0, 50, or 100||0, 190, or 380||100||380||30|
|Ordinary hazard||0, 50, or 100||0, 190, or 380||250||950||60—90|
|Extra hazard||0, 50, or 100||0, 190, or 380||500||1900||90—120|
- *For areas of sprinkler operation less than 1500 ft2 (139 m2) used for light and ordinary hazard occupancies, the density for 1500 ft2 (139 m2) shall be used.
- For areas of sprinkler operation less than 2500 ft2 (232 m2) for extra hazard occupancies, the density for 2500 ft2 (232 m2) shall be used.
(B)The term adjacent shall apply to any sprinkler system protecting a space above, below, or next to the qualifying concealed space except where a barrier with a fire resistance rating at least equivalent to the water supply duration completely separates the concealed space from the sprinklered area.
- Noncombustible and limited-combustible concealed spaces with minimal combustible loading having no access. The space shall be considered a concealed space even with small openings such as those used as return air for a plenum.
- Noncombustible and limited-combustible concealed spaces with limited access and not permitting occupancy or storage of combustibles. The space shall be considered a concealed space even with small openings such as those used as return air for a plenum.
- Combustible concealed spaces filled entirely with noncombustible insulation.
- *Light or ordinary hazard occupancies where noncombustible or limited-combustible ceilings are directly attached to the bottom of solid wood joists or solid limited-combustible construction or noncombustible construction so as to create enclosed joist spaces 160 ft3 (4.5 m3) or less in volume, including space below insulation that is laid directly on top or within the ceiling joists in an otherwise sprinklered concealed space.
- Concealed spaces where rigid materials are used and the exposed surfaces have a flame spread index of 25 or less and the materials have been demonstrated to not propagate fire more than 10.5 ft (3.2 m) when tested in accordance with ASTM E84, Standard Test Method for Surface Burning Characteristics of Building Materials, or ANSI/ UL 723, Standard for Test for Surf ace Burning Characteristics of Building Materials, extended for an additional 20 minutes in the form in which they are installed in the space.
- Concealed spaces in which the exposed materials are constructed entirely of fire-retardant-treated wood as defined by NFPA 703.
- Concealed spaces over isolated small rooms not exceeding 55 ft2 (5.1 m2) in area.
- Vertical pipe chases under 10 ft2 (0.9 m2), provided that in multifloor buildings the chases are firestopped at each floor using materials equivalent to the floor construction, and where such pipe chases contain no sources of ignition, piping shall be noncombustible, and pipe penetrations at each floor shall be properly sealed.
- Exterior columns under 10 ft2 (0.9 m2) in area formed by studs or wood joists, supporting exterior canopies that are fully protected with a sprinkler system.
- *Light or ordinary hazard occupancies where noncombustible or limited-combustible ceilings are attached to the bottom of composite wood joists either directly or on to metal channels not exceeding 1 in. (25 mm) in depth, provided the adjacent joist channels are firestopped into volumes not exceeding 160 ft3 (4.5 m3) using materials equivalent to 1/2 in. (13 mm) gypsum board, and at least 31/2 in. (90 mm) of batt insulation is installed at the bottom of the joist channels when the ceiling is attached utilizing metal channels.
- Wet pipe system
- Light hazard or ordinary hazard occupancy
- 20 ft (6.1 m) maximum ceiling height
- No unprotected ceiling pockets as allowed by 8.6.7 and 8.8.7 exceeding 32 ft2 (3.0 m2)
- No unprotected areas above cloud ceilings as allowed by 8.15.24
For dry pipe systems and double interlock preaction systems, the area of sprinkler operation shall be increased by 30 percent without revising the density.
- Light hazard — Nonrated automatic or self-closing doors.
- Light hazard with no opening protection —Where openings are not protected, calculations shall include the sprinklers in the room plus two sprinklers in the communicating space nearest each such unprotected opening unless the communicating space has only one sprinkler, in which case calculations shall be extended to the operation of that sprinkler. The selection of the room and communicating space sprinklers to be calculated shall be that which produces the greatest hydraulic demand. For light hazard occupancies with unprotected openings in walls, a minimum lintel of depth of 8 in. (200 mm) is required for openings and the opening shall not exceed 8 ft (2.4 m) in width. It shall be permitted to have a single opening of 36 in. (900 mm) or less without a lintel, provided there are no other openings to adjoining spaces.
- Ordinary and extra hazard — Automatic or self-closing doors with appropriate fire resistance ratings for the enclosure.