FOAM EXTINGUISHING SYSTEMS
FOAM EXTINGUISHING PUMPS: Foam extinguishing pumps shall be
designed in accordance with NFPA 20 (1990 edition).
SOLENOID OPERATED VALVES: All solenoid operated valves shall be
equipped with manual release or manual bypass.
ORIFICE PLATES: Orifice plates installed in pipelines for
purposes of reducing pressure are prohibited. Orifice plates used for
proportioning foam concentrate and water are allowed.
FOAM WATER DELUGE (OPEN-HEAD) SYSTEMS: On Navy projects, primary
aircraft hangar protection shall be foam water deluge (open-head) systems at
roof level and floor level foam water monitor nozzles.
CLOSED-HEAD FOAM WATER SPRINKLER SYSTEMS: Closed-head foam water
sprinkler systems shall be pre-action type (i.e., for flammable liquid
warehouse, hazardous waste storage, etc.).
POL ABOVEGROUND STORAGE TANKS: Foam extinguishing systems for POL
above ground storage tanks can be either "over-the-top" application using foam
chambers or subsurface injection per NFPA 11 (1988 edition).
Foam piping materials to be compatible
FOAM PIPING MATERIALS:
with agent for long term use.
ELECTRIC EQUIPMENT IN HANGARS: Electric equipment beneath
sprinkler systems in hangars shall be weatherproof.
NEW FOAM WATER SYSTEMS:
All new foam water systems shall use 3X
BLADDER TANKS: Bladder tanks can be used in foam systems on a
case-by-case basis subject to approval of PACNAVFACENGCOM Code 408. Use foam
pumps and atmospheric tanks for most projects.