Technical data

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3.2 Hydraulic Calculation Procedure:
1. A calculation with a design of twelve ESFR K25.2 VK510 Sprinklers and water,
using four sprinklers on three most remote lines, discharging at the minimum
design pressure for the hazard, with piping friction loss determined by Hazen-
Williams method of determining friction loss in piping.
2. A second hydraulic calculation with a design of six K25.2 ESFR sprinklers
using propylene glycol and the physical properties at the discharge
temperatures, using four sprinklers on the most remote line and two sprinklers
on the second most remote line, discharging at a minimum design pressure for
the hazard, with piping friction loss determined by the Darcy-Weisbach method
of determining friction loss in piping.
3. The 1,100 gallon (4,163 liter) volume restriction for tree type piping
configuration is for the piping included in the remote area (12 sprinklers) and
the supply main piping back to the base of the sprinkler riser above the primary
Easy Riser
TM
Check Valve clapper.
4. Additional mains and sprinkler lines attached to the system, but not in the direct
path to the sprinkler riser base, need not be considered for the system volume
limitation if acceptable by the Authority Having Jurisdiction
.
4.0 PRE-PRIMED SINGLE INTERLOCKED PREACTION SYSTEM FOR COLD
STORAGE
The Viking “Pre-Primed Single Interlocked Preaction” Cold Storage System is electrically
operated using a listed releasing control panel, listed detection system as described in
the technical data, and a listed Viking single interlocked preaction assembly, two Viking
Easy Riser
TM
Check Valves. The first or primary Easy Riser
TM
Check Valve and trim
includes connections for antifreeze supply from the Viking Model CS-1 pump control
assembly that also includes a reservoir for antifreeze and controls. A pressure switch to
control the supervisory antifreeze pressure is also included. The antifreeze must fill the
system less any air pockets in order to prevent water from entering cold storage area
and contaminating the antifreeze mixture, which could cause freezing. A Viking
automatic air vent assembly (Model AV-1) is recommended for installation at the end of
all branch lines and high points of the supply mains. A second Easy Riser
TM
Check
Valve that includes a system main drain and a by-pass line is installed approximately 5
to 10 ft (1,5 to 3,0 m) above or downstream of the first check valve between the freezer
wall and the primary check valve. This valve is required to protect the riser assembly and
clapper of the first check valve from freezing due to hydrodynamic thermal transfer of
cold antifreeze from the freezer to the riser check valve. The by-pass line is required to
allow all system controls on the primary check valve to function properly. This valve also
helps to minimize insulation and heat trace requirements to the riser system outside of
the freezer.
• The single interlocked preaction control valve assembly is a standard Viking
Model E-1 or F-1 Deluge Valve including Conventional Deluge Trim with Electric
Release. This valve controls the supply water to the system having a static
supply pressure capable of supplying adequate starting pressure of the most