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2.0 ESFR SPRINKLER DESCRIPTION
Viking ESFR Pendent K 25.2 Sprinkler VK510 is UL Listed for use with a maximum 50%
by volume factory premix propylene glycol and water antifreeze solution. This listing is
based on full-scale fire testing at Underwriter’s Laboratories. The following limitations of
system design and application shall apply:
2.1 Storage Arrangements: Solid-piled or open rack (single, double, multiple, or
portable), palletized storage (pallets limited to wood), with no open-top containers
or solid shelves.
2.2 Commodity Classification: Limited to Class II or less.
2.3 Maximum Storage/Ceiling Heights and Minimum Pressure Requirements:
• Storage height up to 35 ft. (10,7 m) with ceiling height up to 40 ft. (12,2 m) with
a minimum system design pressure of 40 PSI (278 kPa). OR:
• Storage height up to 40 ft. (12,2 m) with ceiling height up to 45 ft-3 in. (13,8 m)
with a minimum system design pressure of 60 PSI (414 kPa).
3.0 SYSTEM DESIGN
3.1 Hydraulic Calculations:
At -21 °F (-29.4 °C), the 50% solution of propylene glycol/water solution will have
a viscosity of 200 centipoise, as opposed to water at 1 centipoise at 70 °F (21.1
°C). Two sets of hydraulic calculations will be required for the system piping; one
utilizing Hazen-Williams method of determining friction loss, and one utilizing
Darcy-Weisbach method of determining friction loss. The Hazen-Williams friction
loss factors will be utilized for flowing water through the piping, the Darcy-
Weisbach friction loss factors will be utilized for flowing propylene glycol/water
solution through the system piping at the lowest operating temperature.
The information in Table 1 is provided for Firefighter Eliminator F 50% propylene
glycol/water pre-mix solution, while the information in Table 2 is provided for
Firefighter Eliminator C 35% propylene glycol/water pre-mix solution.
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