on return bends when both the sprinklers and the return bends are located
in a heated area].
2.1.3
Cabinet
Provide metal cabinet with extra sprinkler heads and sprinkler head wrench
adjacent to each dry pipe valve. The number and types of extra sprinkler
heads shall be as specified in NFPA 13.
2.1.4
Dry Pipe Valves
Provide valve complete with accessories and appurtenances for the proper
operation of the system.
2.1.5
Water Motor Alarms
Provide alarms of the approved weatherproof and guarded type, to sound
locally on the flow of water in each corresponding sprinkler system. Mount
alarms on the outside of the outer walls of each building at a location as
directed. Provide separate drain piping directly to exterior of building.
2.1.6
Pressure Switch
Provide switch with circuit opener or closer for the automatic transmittal
of an alarm over the facility fire alarm system. Connection of switch
shall be under Section [13851N EXTERIOR FIRE ALARM SYSTEM] [13852N INTERIOR
FIRE DETECTION AND ALARM SYSTEM]. Do not install a shutoff valve in the
piping between the dry pipe valve and any pressure switch.
2.1.7
Low Air Pressure Supervisory Switch
Provide switch for each sprinkler system and connect to building fire alarm
system to activate the system supervisory alarm when air pressure in system
drops halfway from the normal pressure to the tripping point. Connection
of switch shall be under Section [13852N INTERIOR FIRE DETECTION AND ALARM
SYSTEM] [_____]. Provide a bleeder valve in the air line ahead of the
switch for testing operation of the switch. The valve shall be normally
open. Closing the valve shall shut off the air supply to the switch and
exhaust the pressure between the switch and valve.
2.1.8
Tank Mounted Air Compressor
Provide an approved, automatic type, electric motor-driven air compressor
including pressure switch, air piping, and [_____] [38 liter] [10 gallon]
minimum capacity tank. Compressor shall have a minimum capacity capable of
charging the complete sprinkler system to normal system air pressure within
30 minutes. Provide an approved automatic air maintenance device for each
system.
2.1.9
Pipe Hangers and Supports
Provide in accordance with NFPA 13. Attach to steel joists with MSS SP-58,
Type 19 or 23 clamps and retaining straps. Attach to Steel W or S beams
with Type 21, 28, 29, or 30 clamps. Attach to steel angles and vertical
web steel channels with Type 20 clamp with beam clamp channel adapter.
Attach to horizontal web steel channel and wood with drilled hole on
centerline and double nut and washer. Attach to concrete with Type 18
insert or drilled expansion anchor.
SECTION 13935N
Page 11
Previous Page
