Bulletin 056
Page 6 of 24
December 2016
www.reliablesprinkler.com
Model DS56 Specific Application Sprinkler
SIN RA5625
Technical Specifications
Style: Upright
Orientation: Frame arms perpendicular to roof
deck
Threads: 1/2” NPT or ISO 7-1R1/2
Nominal K-Factor: 5.6 (80 metric)
Max. Working Pressure: 175 psi (12 bar)
Sprinkler Temperature Rating: 212°F (100°C)
Sensitivity: Quick-response
Hydraulic Design Criteria
(See Tables F and H)
Finish
Brass
Sprinkler Wrench
Model DS56
Listings and Approvals
cULus Listed
Hazard Classification
Light Hazard
System Types
Wet-pipe with steel or Listed CPVC pipe
Dry-pipe with steel pipe
Installation Criteria
Sprinkler Spacing
Max: 6 ft (1.8 m) across roof slope
Min: 4 ft (1.2 m) across roof slope
Min: 26 ft (7.9 m) down the roof slope
measured parallel to the roof deck
Horizontal Distance from Face of Truss
Min: 6 inches (150 mm)
Horizontal Distance from Draft Curtain or
Wall
Min: 34 inches (860 mm)
Max: 38 inches (970 mm)
Vertical Distance of Top of Deflector Above
Bottom of Draft Curtain
Min: 8 inches (200 mm)
Model DS56 sprinklers may be installed
back-to-back on opposite sides of a
ridge where a draft curtain is installed to
separate the back-to-back rows of
sprinklers.
Vertical Distance of Top of Deflector Above
Scissor Truss
Min: 18 inches (450 mm)
Distance from Top of Deflector to Roof
Deck
(measured perpendicular to roof deck)
Min: 9 inches (230 mm)
Max: 13 inches (330 mm)
Material Specifications
Thermal Sensor: Nickel Alloy Solder Link
Levers: Brass Alloy
Frame Body: Brass Alloy
Frame Arms: Brass Alloy
Yoke: Copper Alloy
Sealing Assembly: Nickel Alloy with
PTFE
Load Screw: Bronze Alloy
Deflector: Bronze Alloy
Model DS56 Sprinkler Components and Dimensions
Figure 5
Model DS56 Minimum Required Flow and Residual Pressure
Table F
Ceiling Slope
Max. Coverage
Area
ft x ft
(m x m)
Flow
gpm
(l/min)
Pressure
psi
(bar)
4:12 to 8:12
6 x 30
1
(1.8 x 9.1)
23
(87)
16.9
(1.17)
6 x 40
2
(1.8 x 12)
35
(132)
39.1
(2.70)
1
Coverage is 30 ft (9.1 m) down slope measured along the floor.
2
Coverage is 40 ft (12 m) down slope measured along the floor.
