8.17.4.6.2 Retroactive Installation. When backflow preven-tion devices are to be retroactively installed on existing sys-tems, a thorough hydraulic analysis, including revised hydrau-lic calculations, new fire flow data, and all necessary systemmodifications to accommodate the additional friction loss,shall be completed as a part of the installation.

8.17.5 Hose Connections.

8.17.5.1 Small [112 in. (38 mm)] Hose Connections. See Sec-tion C.5.

8.17.5.1.1* Where required, small [112 in. (38 mm)] hose con-nections shall be installed. Valves shall be available to reach allportions of the area with 100 ft (30.5m) of hose plus 30 ft (9.1m)of hose stream distance.

8.17.5.1.1.1 Where the building is protected throughout byan approved automatic sprinkler system, the presence of 112in. (38 mm) hose lines for use by the building occupants shallnot be required, subject to the approval of the authority hav-ing jurisdiction.

8.17.5.1.2 The hose connections shall not be required to meetthe requirements of Class II hose systems defined by NFPA 14,Standard for the Installation of Standpipe and Hose Systems.

8.17.5.1.3 Hose connections shall be supplied from one ofthe following:

(1) Outside hydrants(2) A separate piping system for small hose connections(3) Valved hose connections on sprinkler risers where such

connections are made upstream of all sprinkler controlvalves

(4) Adjacent sprinkler systems(5) In rack storage areas, the ceiling sprinkler system in the

same area (as long as in-rack sprinklers are provided inthe same area and are separately controlled)

8.17.5.1.4* Hose connections used for fire purposes only shallbe permitted to be connected to wet pipe sprinkler systemsonly, subject to the following restrictions:

(1) Hose connections supply pipes shall not be connected toany pipe smaller than 212 in. (65 mm) in diameter.

(2) The requirements of 8.17.5.1.4(1) shall not apply to hy-draulically designed loops and grids, where the minimumsize pipe between the hose connections supply pipe andthe source shall be permitted to be 2 in. (51 mm).

(3) For piping serving a single hose connection, pipe shall bea minimum of 1 in. (25.4 mm) for horizontal runs up to20 ft (6.1 m), a minimum of 114 in. (33 mm) for the entirerun for runs between 20 ft and 80 ft (6.1 m and 24.4 m),and a minimum of 112 in. (38 mm) for the entire run forruns greater than 80 ft (24.4 m). For piping serving mul-tiple hose connections, runs shall be a minimum of 112 in.(38 mm) throughout.

(4) Piping shall be at least 1 in. (25 mm) for vertical runs.(5) Where the residual pressure at a 112 in. (38mm) outlet on

a hose connection exceeds 100 psi (6.9 bar), an approvedpressure-regulating device shall be provided to limit theresidual pressure at the outlet to 100 psi (6.9 bar).

(6) Where the static pressure at a 112 in. (38 mm) hose con-nection exceeds 175 psi (12.1 bar), an approved pressure-regulating device shall be provided to limit static and re-sidual pressures at the outlet to 100 psi (6.9 bar).

8.17.5.2 Hose Connections for Fire Department Use.

8.17.5.2.1 In buildings of light or ordinary hazard occupancy,212 in. (64 mm) hose valves for fire department use shall bepermitted to be attached to wet pipe sprinkler system risers.

8.17.5.2.2* The following restrictions shall apply:

(1) Each connection from a standpipe that is part of a com-bined system to a sprinkler system shall have an individualcontrol valve and check valve of the same size as the con-nection.

(2) The minimum size of the riser shall be 4 in. (102 mm)unless hydraulic calculations indicate that a smaller sizeriser will satisfy sprinkler and hose stream allowances.

(3) Each combined sprinkler and standpipe riser shall beequipped with a riser control valve to permit isolating ariser without interrupting the supply to other risers fromthe same source of supply. (For fire department connectionsserving standpipe and sprinkler systems, refer to Section 6.8.)

Chapter 9 Hanging, Bracing, and Restraint of SystemPiping

9.1 Hangers.

9.1.1* General.

9.1.1.1 Unless the requirements of 9.1.1.2 are met, types ofhangers shall be in accordance with the requirements of Sec-tion 9.1.

9.1.1.2 Hangers certified by a registered professional engi-neer to include all of the following shall be an acceptable al-ternative to the requirements of Section 9.1:

(1) Hangers shall be designed to support five times theweight of the water-filled pipe plus 250 lb (114 kg) at eachpoint of piping support.

(2) These points of support shall be adequate to support thesystem.

(3) The spacing between hangers shall not exceed the valuegiven for the type of pipe as indicated in Table 9.2.2.1(a)or Table 9.2.2.1(b).

(4) Hanger components shall be ferrous.(5) Detailed calculations shall be submitted, when required

by the reviewing authority, showing stresses developed inhangers, piping, and fittings and safety factors allowed.

9.1.1.3 Where water-based fire protection systems are re-quired to be protected against damage from earthquakes,hangers shall also meet the requirements of 9.3.7.

9.1.1.4 Listing.

9.1.1.4.1 Unless permitted by 9.1.1.4.2 or 9.1.1.4.3, the com-ponents of hanger assemblies that directly attach to the pipeor to the building structure shall be listed.

9.1.1.4.2* Mild steel hangers formed from rods shall be per-mitted to be not listed.

9.1.1.4.3* Fasteners as specified in 9.1.3, 9.1.4, and 9.1.5 shallbe permitted to be not listed.

9.1.1.4.4 Other fasteners shall be permitted as part of ahanger assembly that has been tested, listed, and installed inaccordance with the listing requirements.

1392 INSTALLATION OF SPRINKLER SYSTEMS

2010 Edition