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 Table F and Figures 9 - 29)
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
Minimum 4 ft (1.2 m), maximum 6 ft (1.8m)
between sprinklers along ridge
Minimum 26 ft (7.9 m) down the roof slope
toward eave to nearest sprinkler,
measured parallel to the roof deck
Horizontal Distance from Face of Truss
Min: 6 inches (150 mm)
Horizontal Distance from Draft Curtain or Wall
(1)
Min: 30 inches (762 mm)
Max: 42 inches (1067 mm)
Vertical Distance of Top of Deflector Above
Bottom of Draft Curtain
Min: 8 inches (200 mm)
Vertical Distance 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* (1.8 x 9.1)
23 (87)
16.9 (1.17)
6 x 40*
(1.8 x 12)
35 (132)
39.1 (2.70)
*Long dimension of coverage area to be along the roof slope parallel to trusses. Length of coverage area is in one direction from the
sprinkler toward eave. Coverage area is measured parallel to the floor.
(1)
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.
Bulletin 056
February 2020
Page 6 of 27
www.reliablesprinkler.com
