Technical data

14
• Where the minimum temperature in the area being protected is between 8 °F
(-13.3 °C) and -21 °F (-29.4 °C), the percentage by volume of propylene
glycol must be 50%, factory premixed with water for antifreeze solution.
Viking requires Firefighter Eliminator F type 50% propylene glycol/water
mixture, with a freeze temperature rating (freeze point) of -26 °F (-32.2 °C).
• Minimum ambient temperature is -21 °F (-29.4 °C). NOTE: The minimum
temperature is NOT an average in the freezer, but is the lowest temperature
for the system.
• Maximum system volume is 1,100 gallons (4 163 liters). Refer to calculation
to determine volume.
• Use ordinary temperature rated 165 °F (74 °C) Viking ESFR K25.2 Sprinkler
VK510. Exception: Intermediate temperature rated 205 °F (96 °C) Viking
ESFR VK510 K25.2 Sprinklers that are intended for installation in close
proximity to heat sources may be applied only as referenced in NFPA 13.
• The piping system must be pitched for drainage of the system after operation.
For refrigerated area systems, the piping system shall be pitched to drain
complete system toward the riser and alarm valve with branch lines at ½” per
10 ft. (4 mm/m) and mains at ½” per 10 ft. (4 mm/m) run of pipe. For systems
in unheated areas subject to freezing, branch lines shall be pitched at ½” per
10 ft. (4 mm/m) and mains at ¼” per 10 ft. (2 mm/m) run of pipe.
• The system must be designed so maximum operating pressure of the system
does not exceed 175 PSI (1 207 kPa) at the sprinkler, including test
pressures of pumps at zero flow.
• Detection System shall be capable of operation prior to or equal to an ESFR
Sprinkler having an RTI (Response Time Index) of 50 or less. No linear
detection shall be allowed. This limits the system to low temp spot heat,
beam smoke or air sample type smoke system or equal.
5.1.1 Piping System to Sprinklers
Tree type piping configurations vary. There are side or end feeds, offset
feeds, and center feeds. Many times the configuration of the tree system
piping is dictated by building features or by hydraulic calculations.
The maximum system volume must be maintained and is calculated at a
maximum from the primary Easy Riser
TM
Check Valve, including all piping
to the remote sprinklers (refer to calculation to determine volume).
The deluge valve and trim system, system check valves along with all
antifreeze and supply piping, must be installed in a heated area that is
maintained at or above 40 °F (4 °C). Insulating the fire sprinkler riser will
be required to eliminate condensation and frost from developing on the
piping in the heated area. Insulate the riser main from the freezer wall to
the isolation check valve. If the primary system check valve is close
enough to isolation check valve [less than the 5 ft (1,5 m) recommended]
and freezer separation wall to cause freezing of water and condensation
on piping below the check valve, then a listed heat trace heating system
may be required for the riser piping above and below the primary check
valve that will maintain a temperature under the insulation of 70 °F (21.1
°C) to eliminate condensation and maintain internal temperature of