ETL 1110-3-484
26 Sep 97
provide water-powered, non-aspirating short barrel type with individual nozzle flow rate of 1893
L/min (500 gpm) or less.
10.5 Interior Hose Stations.
10.5.1 General. Do not provide hose stations in aircraft servicing and storage areas unless
specifically required by applicable Department of Defense (DoD) criteria. The NFPA 409
requirement is not valid for providing hose stations.
10.6 System Valves and Components.
10.6.1 Alarm Check Valves. Use alarm check valves in wet-pipe foam-water sprinkler systems
and in systems supplying foam solution to nozzle system automatic water control (deluge) valves.
Include retard chambers with the alarm line trim piping on alarm check valve installations.
Arrange alarm line piping to individually actuate respective water-powered foam concentrate
control valves.
10.6.1.1 Waterflow Switch with Time Delay. Unless otherwise required by applicable design
criteria, provide waterflow switches with adjustable time delay for use in wet-pipe systems
required to actuate nozzle systems upon detection of flow in the sprinkler system. Locate the
switch in the alarm trim upstream of retard chamber and independent of other circuit closers
(pressure switches). Assure that the switch is installed so that there is no shutoff valve in the
piping to the switch. Specify switch to have adjustable time delay of 0 to 45 seconds (minimum).
10.6.2 Automatic Water Control (Deluge) Valves. Provide automatic water control valves in
preaction sprinkler systems and for automatic control of nozzle system flow. Arrange alarm line
piping to individually actuate respective water-powered foam concentrate control valve. To
facilitate resetting valve after operation, specify such valves to have the feature of being resettable
without having to use special tools or to remove the face-plate of the valve.
10.6.3 Shut-off Valves. Specify only UL-listed indicating-type control valves for controlling
water or foam solution. Provide OS&Y type valves for controlling water or foam solution.
Provide indicating type ball valves for controlling AFFF concentrate.
10.6.4 Basket Strainers. Provide basket strainers for installations with nozzle systems. Omit
strainers on systems with overhead sprinklers only. Locate the strainer in the valve manifold or
the nozzle system riser located in the fire protection equipment room.
10.6.5 Fire Department Connections. Do not provide fire department siamese connections on
aircraft hangar foam-water sprinkler systems supplied by water systems with fire pumps.
B-15
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