Sprinkler system.

TM 38-400/NAVSUP PUB 572/AFMAN 23-210 MCO 4450.14/DLAM 4145.12

fire streams required during the more advanced stages

These may include mercantile storage and display, auto

of fire on the inside of buildings or for exposure fire.

showrooms, parking garages, light manufacturing,

warehouses not classified as extra hazard, school shop

(2) Class II-For use primarily by the building

areas, etc.

occupants until the arrival of the fire department (small

hose). The system affords a ready means for the

control of incipient fires by the occupants of buildings

c. An extra hazard is a situation where the amount

during working hours and by watchmen and those

of combustibles or flammable liquids present is such

present during the night time and holidays.

that fires of severe magnitude may be expected. These

(3) Class III-For use by either fire

may include woodworking, auto repair, aircraft servicing,

departments and those trained in handling heavy hose

warehouses with highpiled (14 ft or higher)

streams or by the building occupants. The system is

combustibles, and processes such as flammable liquid

capable of furnishing the effective fire streams required

handling, painting, dipping, etc.

during the more advanced stages of fire on the inside of

buildings as well as providing a ready means for the

6-16. Sprinkler system.

control of fires by the occupants of the building.

A sprinkler system, for fire protection purposes, is an

integrated system of underground and overhead piping

b. Standpipe systems are usually of the following

designed in accordance with fire protection engineering

types:

standards. The system includes a suitable water supply

such as a gravity tank, fire pump, reservoir, or pressure

(1) A wet standpipe system having a supply

tank and/or connection by underground piping to a city

valve open and water pressure maintained at all times.

main. The portion of the sprinkler system aboveground

(2) A standpipe system so arranged through

is a network of specially sized or hydraulically designed

the use of approved devices as to admit water to the

piping installed in a building, structure, or area,

system automatically by opening a hose valve.

generally overhead, and to which sprinklers are

(3) A standpipe system arranged to admit

connected in a systematic pattern. The system includes

water to the system through manual operation of

a controlling valve and a device for actuating an alarm

approved remote control devices located at each hose

when the system is in operation. The system is usually

station.

activated by heat from a fire and discharges water over

(4) Dry standpipe having no permanent water

the fire area.

supply.

NOTE

The design and installation of water supply

See 29 CFR 1910.158 for specific design and

facilities such as gravity tanks, fire pumps,

requirements for standpipe and hose

reservoirs,

pressure

tanks,

and

systems.

underground piping are covered by NFPA

standards No.

22-1970, Water Tanks For

6-19.

Types of storage (in relation to fire

Private Fire Protection; No.

20-1970,

protection).

Installation of Centrifugal Fire Pumps; and

a. Type I storage. Type I storage is that in which

No. 24-1970, Outside Protection.

combustible

commodities

noncombustible

commodities involving combustible packaging or

6-17. Sprinkler alarms.

storage aids are stored over 15 feet, but not more than

A sprinkler alarm unit is an assembly of apparatus

21 feet high, in solid piles or over 12 feet, but not more

approved for the service and so constructed and

than 21 feet high, in piles that contain horizontal

installed that any flow of water from a sprinkler system

channels. Minor quantities of commodities of hazard

equal to or greater than that from a single automatic

greater than ordinary combustibles may be included

sprinkler will result in an audible alarm signal on the

without affecting this general classification.

premises.

b. Type II storage. Type II storage is that in which

combustible

commodities

noncombustible

6-18. Class of service-standpipe systems.

commodities involving combustible packaging or

a. Standpipe systems are grouped into the three

storage aids are stored not over 15 feet high in solid

following general classes of service for the intended

piles or not over 12 feet high in piles that contain

uses in the extinguishment of fire:

horizontal

channels.

(1) Class I-For use by fire departments and

those trained in handling heavy fire streams (2 1/2 inch

hose). The system is capable of furnishing the effective

6-5