26 September 2006
concerning installation and arrangement of foam systems for various types of
flammable and combustible liquids hazards.
The foam solution piping must use Schedule 40 steel pipe. The foam
concentrate piping must use stainless steel pipe with roll grooved fittings, welded
joints and fittings, or flanged joints and fittings. If using welded joints and fittings,
consideration must be given to the maintenance of the system and provide
flanged joints at certain locations to allow for the ease of maintenance. The trim
piping on all deluge valves, flow control valves, and alarm check valves must
utilize brass piping. Any concealed concentrate piping must use welded or
Foam Systems that utilize AFFF must only use AFFF concentrate meeting
Military Specification MIL-F-24385F, Fire Extinguishing Agent, Aqueous Film-
Forming Foam (AFFF) Liquid Concentrate, for Fresh and Seawater.
New AFFF systems must use potable water or a water source that
is supplied from a potable water system (i.e., a water storage tank that is filled
from a potable water system). The use of saltwater or untreated fresh water
must be approved by the AHJ.
When required, standpipe systems must be installed in accordance with NFPA
14, Installation of Standpipe and Hose Systems.
Exception: Residual pressure requirements specified in NFPA 14 may be
omitted for buildings under 45 m (150 ft) in height where fire department
apparatus are expected to boost pressure in standpipe systems.
Class I Standpipe Systems
Class I standpipe systems must be provided in exit stairways of buildings four
stories or more in height. These systems must not include hose.
Class I standpipe systems must also be provided in facilities where it is not
practical to reach major portions of the building with fire fighting hose lines
extended from the exterior of the building, regardless of building height.
Class II and Class III Standpipes.
Class II and Class III standpipes are not permitted.
DRY CHEMICAL EXTINGUISHING SYSTEMS.