FOAM EXTINGUISHING SYSTEMS
FOAM EXTINGUISHING PUMPS: Foam extinguishing pumps
shall be designed in accordance with NFPA 20 (1987 edition).
SOLENOID OPERATED VALVES; All solenoid operated valves
shall be equipped with manual release or manual bypass.
ORIFICE PLATES: Orifice plates installed in pipelines
f o r 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.
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 aboveground storage tanks shall employ "over-the-top"
application using foam chambers.
FOAM PIPING MATERIALS: Foam piping materials to be
compatible with agent for long term use.
ELECTRIC EQUIPMENT in HANGARS: Electric equipment
beneath sprinkler systems in hangars shall be weather proof.
NEW FOAM WATER SYSTEMS:
All new foam water systems
shall use 3% concentration.
BLADDER TANKS: Bladder tanks shall not be used in foam
Use foam pumps and atmospheric tanks.