Class I and Class III standpipes shall be at least 4 in. Pipes can be sized by hydraulic calculations or according to pipe Schedule Sizing.
Where standpipes are supplied by tanks located at the top of the building or zone, they also shall be interconnected at the top in such cases, check valves shall be installed at the base of each standpipe to prevent circulation. Where two or more standpipes are installed in the same building or section of building, they shall be interconnected at the bottom. Separate standpipes shall be provided in each required exit stairway. Stand Pipe Number and Connections ( NFPA 14 - 5.4&5.5 ) Class III systems shall be provided with hose connections as required for both Class I and Class II systems. Distances shall be measured along a path of travel originating at the hose connection. hose or within 120 ft (36.6 m) of a hose connection provided with less than 11/2-in. hose stations so that all portions of each floor level of the building are within 130 ft (39.7 m) of a hose connection provided with 11/2in. Class II systems shall be provided with 11/2-in. (f) * Where the most remote portion of a nonsprinklered floor or story is located in excess of 150 ft (45.7 m) of travel distance from a required exit containing or adjacent to a hose connection, or the most remote portion of a sprinklered floor or story is located in excess of 200 ft (61 m) of travel distance from a required exit containing or adjacent to a hose connection, additional hose connections shall be provided, in approved locations, where required by the local fire department or the authority having jurisdiction. hose connection shall be provided at the hydraulically most remote riser to facilitate testing of the system. (e) At the highest landing of stairways with stairway access to a roof, and on the roof where stairways do not access the roof. (d) In covered mall buildings, at the entrance to each exit passageway or exit corridor, and at exterior public entrances to the mall.
(c) In each exit passageway at the entrance from the building areas into the passageway. (b) On each side of the wall adjacent to the exit openings of horizontal exits. Exception: Hose connections shall be permitted to be located at the main floor landings in exit stairways where approved by the authority having jurisdiction. hose connections in the following locations:(a) At each intermediate landing between floor levels in every required exit stairway. Sytem Classes ( NFPA 14 - 5.3 ) a) Class I Systems. Hydraulic Calculations Procedures ………………………….35ġ. Sprinklers Distribution and Network Piping ……………….34 10. Hydraulic Calculations Procedures ….……………………….4 Stand Pipe Number and Conections ……………………….2 3. Contents PART (I) STAND PIPE SYSTEM DESIGNġ.