Viking ESFR Service Manual download pdf (Page 9)

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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Viking ESFR Service Manual Page 9