The Viking ESFR Pre-Primed Single Interlock Preaction Cold Storage System is a fixed fire protection
system designed for installation in refrigerated, cold storage and unheated warehouse applications
with rack storage of Class II commodity on wood pallets. This system effectively prevents frost plugs
associated with systems that supervise the piping network with air. The single interlock preaction system piping network is supervised with a propylene glycol solution. When using this system for single-,
double- and multiple-row rack storage, Viking K25.2 ESFR sprinklers are used at the ceiling only and
no in-rack sprinklers are required.
1. System Considerations
All materials installed on the system shall be compatible with propylene glycol solution.
•
Where the minimum temperature in the area being protected is 8 °F (-13.3 °C) or above,
•
Firefighter Eliminator C 35% percent by volume propylene glycol factory premixed solution
must be used.
Where the minimum temperature in the area is between 8 °F (-13.3 °C) and -21 °F (-29.4 °C),
•
firefighter Eliminator F 50% percent by volume propylene glycol factory premixed solution
must be used.
The minimum ambient temperature where the system can be used is -21 °F (-29.4 °C). This
•
is not an average temperature; it is the lowest temperature within the area.
The system piping configuration shall be designed in a tree configuration only. The
•
mains and branch lines should not be looped together. Grid systems are NOT allowed. The
piping system shall be pitched to drain completely. The branch lines shall be pitched at ¼”
per 10 ft (4 mm/m) run of pipe and the mains shall be pitched ½” per 10 ft (4 mm/m) run of
pipe.
2. System Makeup
Each Viking ESFR Pre-Primed Single Interlock Preaction Cold Storage System requires the following components for proper operation:
Water Supply Control Valve
•
Deluge Valve with Conventional Deluge Valve Trim
•
Electric Release Trim with Solenoid Valve
•
®
Primary Easy Riser
•
Control Trim
Bypass Easy Riser
•
Digital Supervisory Pressure Switch
•
CS-1 Tank and Pump Package
•
Viking VFR-400 Release Control Panel
•
Reclaim tank for Automatic Pressure Control System
•
System Reclaim Tank (Recommended)
•
AV-1 Automatic Air Vent (One for each high point recommended)
This system shall be designed by qualified fire protection professionals in conjunction with the
requirements listed in this technical data, NFPA 13, and those of the authority having jurisdiction.
The system designer must read and apply all of the following design requirements.
INTERLOCK PREACTION
COLD STORAGE SYSTEM
March 7, 2008
II. SYSTEM DESIGN
1. Hydraulic Calculations
Two hydraulic calculations are required for the system:
The first calculation shall be with the 12 Viking VK510 K25.2 ESFR’s assuming they are flowing
water. This calculation shall include 4 sprinklers on the 3 most hydraulically remote branch lines
discharging at the minimum design pressure for the system. This calculation shall use the Hazen
Williams formula. See examples in Figures 3 & 4.
The second calculation shall include 6 Viking VK510 K25.2 ESFR’s flowing propylene glycol
solution. The calculation shall include 4 sprinklers on the most hydraulically remote branch line
and 2 sprinklers on the second most hydraulically remote branch line discharging at the minimum
design pressure required for the system. This calculation shall use the Darcy-Weisbach formula.
See examples in Figures 6-8.
Full-scale fire testing has demonstrated that the propylene glycol solution will be expelled from
the system by the time 6 sprinklers are operating in a fire condition. The 6-head sprinkler calculation using the Darcy-Weisbach formula is used to ensure that the piping has been sized properly
and the water supply is adequate for the more viscous liquid. Because the propylene glycol will
have a dramatically different viscosity at the colder temperature expected in this application, friction loss through the piping network will be significantly higher than water.
When conducting hydraulic calculations, a good rule of thumb is to increase pipe size when
friction loss has reached .3 PSI per foot of pipe. By setting up the spreadsheet described in
Appendix B, a quick estimation of the difference in friction loss will assist in determining if the
desired pipe size will be adequate. The final pipe sizes will need to be confirmed through the
actual hydraulic calculations.
Figure 2 - Example of Remote Area for Hazen Williams Calculation
Center Feed Tree
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Typically, when a partial branch line is required in the hydraulic calculations, the sprinklers closer to
the cross main will be used, as shown above. The calculation of the closer sprinklers will result in less
friction loss and a smaller pressure demand on the branch line. At the cross main, a K factor for the
branch lines will need to be determined. The lower pressure requirement will result in a larger K factor and thus require more water on the partial branch line, typically making the closer sprinklers more
demanding.
Figure 5 - Example of Remote Area for Darcy-Weisbach Calculation
Center Feed Tree
Page 10
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Darcy-Weisbach Method for Calculating Friction in Piping:
Most hydraulic calculation software used in the sprinkler industry today has the option for conducting
the piping friction loss calculations with the Darcy-Weisbach method. The reason for conducting the
additional 6 sprinkler head calculation is to verify that the available water supply pressure is adequate
for the initial discharge of propylene glycol solution. The example calculations provided in Figures 68 illustrate the difference in results that can occur when calculating for the more viscous propylene
glycol solution versus the standard Hazen-Williams calculation for water illustrated in Figures 3-4.
For those not familiar with the Darcy-Weisbach method below is the basic procedure that is used to
conduct the calculation. This is intended only to provide the designer with an understanding of the
concepts of the method. It is not practical that the calculation be done by hand as this would be much
too time consuming and subject to potential errors.
2
The Darcy-Weisbach Formula as found in most text is written as: h= (f) (l) (v)
h=friction loss (ft of head)
f=friction factor (from Moody Diagram-Figure 10)
l=length of pipe (ft)
v=velocity (ft/sec)
d=diameter of pipe (ft)
2
g=gravitational constant (32.2 ft/sec
)
/ (d) (2) (g)
This formula can be rearranged and simplified to:
2/d5
When the calculated Reynolds Number (Re) is >2000 =0.000216 fLρQ
When the calculated Reynolds Number (Re) is <2000 =0.000273 μLQ/d
=Friction Loss (psi)
4
=Friction Loss (psi)
Where:
Re=50.6Qρ/dμ
Q=flow (gpm)
2. Determining the Required Volume of Propylene Glycol
The system design area (12 sprinklers: 4 on each of the 3 hydraulically most remote branch lines)
and bulk main to the primary Easy Riser® Check Valve (lines in bold) at the base of the riser is
limited to a total volume of 1,100 gallons.* Additional mains and sprinkler lines attached to the
sprinkler system, but not in the direct path to the base of the riser, do not need to be considered
in the volume restriction.
The actual volume of propylene glycol solution for the sprinkler system is determined by adding
all the sprinkler piping together. Additional propylene glycol is added to this total for the CS-1
Tank and supply lines to the riser.
Table 1
From NFPA 13 - Table A.7.2.3 -
Capacity of 1 ft. of Pipe (Based on Actual Internal Pipe Diameter)
For SI units, 1 in. = 25.4 mm; 1 ft. = 0.3048 m; 1 gal = 3.785 L.
a
Schedule 80.
b
0.134 wall pipe.
c
0.188 wall pipe.
Nominal
Pipe
Diameter
in.mm
Pipe
Schedule 40
(gal)
a
Schedule 10
(gal)
b
c
2.776
Example:
Assume 100 ft² spacing, 10 ft between the sprinklers and 10 ft between the branch lines.
•
Schedule 10 Pipe.
•
3” Pipe = 300’ x .433 = 129.9 gal.
4” Pipe = 20’ x .740 = 14.8 gal.
6” Pipe = 74’ x 1.649 = 120.0 gal.
Total Volume = 247 gal.
* Note: Based on the installation history of this system, systems near 25,000 ft2 in area, with long runs on feed main, typically
begin to approach the 1,100 gallon restriction, or begin to demand excessive pressures in the Darcy-Weisbach calculation.
This history can be used as an estimating tool, however, the actual system volume must be calculated.
Page 18
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Definitions:
Class II Commodity - A Class II commodity shall be defined as a noncombustible product that
is in slatted wooden crates, solid wood boxes, multiple layered corrugated cartons or equivalent
combustible packaging material with or without pallets.
Longitudinal Flue Space - The space between the rows of storage perpendicular to the direction of loading.
Transverse Flue Space - The distance between rows of storage parallel to the direction of loading.
L = Longitudinal Flue Space
T = Transverse Flue Space
Figure 12 - Single Row Rack Storage
Racks that have no longitudinal fl ue space
and that have width up to 6 ft, and aisles at
leas 3½ ft from any other storage.
Figure 13 - Double Row Rack Storage
Two single row racks placed back to back
having a combined width up to 12 ft with
aisles at least 3½ ft on each side.
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Racks greater than 12 ft (3.7 m) wide or single or double row racks separated by aisles less
than 3½ ft (1.07 mm) wide having an overall width greater than 12 ft (3.7 m).
Notes:
The system is acceptable for use with Class I and Class II commodities only.
1.
For use with a maximum 50% by volume propylene glycol and water antifreeze solution with
2.
a maximum ceiling height of 40 ft (12.2 m) and a maximum Class II commodity height of 35 ft
(10.7 m) with a maximum deflector distance below the ceiling of 18” (457 mm). The minimum
starting pressure is 40 PSI (2.76 Bar).
For use with a maximum 50% by volume propylene glycol and water antifreeze solution with
3.
a maximum ceiling height of 45ft-3 in (13.8 m) and a maximum Class II commodity height
of 40 ft (12.2 m) with a maximum deflector distance below the ceiling of 14” (356 mm). The
minimum starting pressure is 60 PSI (4.14 Bar).
The VK510 ESFR’s shall be ordinary temperature 165 °F (74 °C) except where required to
4.
be intermediate temperature 205 °F (96 °C) due to close proximity to heating sources as
described in NFPA 13.
The system shall be designed so that the maximum operating pressure does not exceed 175
5.
PSI (12 Bar) at the ESFR sprinklers.
Only wood pallets are acceptable.
6.
Page 20
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Table A.5.6.3.1 Examples of Class I CommoditiesTable A.5.6.3.1 Continued
Alcoholic Beverages
Cartoned or uncartoned
- Up to 20 percent alcohol in metal, glass, or ceramic containers
Appliances, Major (e.g., stoves, refrigerators)
- Not packaged, no appreciable plastic exterior
trim
Batteries
Dry cells (nonlithium or similar exotic metals)
- Packaged in cartons
Automobile
- Filled*
Bottles, Jars
Empty, cartoned
- Glass
Filled noncombustible liquids
- Glass, cartoned
- Plastic, cartoned [less than 5 gal (18.9 L)]
- Plastic, PET
Filled noncombustible powders
- Glass, cartoned
Canned Foods
In ordinary cartons
Cans
Metal
- Empty
Cement
Bagged
Coffee
Canned, cartoned
Fertilizers
Bagged
- Phosphates
File Cabinets
Metal
- Cardboard box or shroud
Fish or Fish Products
Frozen
- Nonwaxed, nonplastic packaging
Canned
- Cartoned
Frozen Foods
Nonwaxed, nonplastic packaging
Fruit
Fresh
- Nonplastic trays or containers
-With wood spacers
Ice Cream
Meat, Meat Products
- Bulk
- Canned, cartoned
- Frozen, nonwaxed, nonplastic containers
Metal Desks
-With plastic tops and trim
Milk
- Nonwaxed-paper containers
- Waxed-paper containers
- Plastic containers
Motors
- Electric
Nuts
- Canned, cartoned
Paints
Friction-top cans, cartoned
- Water-based (latex)
Plastic Containers
- Noncombustible liquids or semiliquids in plastic containers less than 5 gal (18.9 L) capacity
Poultry Products
- Canned, cartoned
- Frozen, nonwaxed, nonplastic containers
Salt
Bagged
Syrup
Drummed (metal containers)
Transformers
Dry and oil fi lled
Wire
Bare wire on metal spools on wood skids
*Most batteries have a polypropylene case and,
if stored empty, should be treated as a Group A
plastic. Truck batteries, even where fi lled, should
be considered a Group A plastic because of their
thicker walls.
March 7, 2008
Page 23
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Table A.5.6.3.2 Examples of Class II CommoditiesTable A.5.6.3.2 Continued
Alcoholic Beverages
Up to 20 percent alcohol in wood containers
Appliances, Major (e.g., stoves)
Corrugated, cartoned (no appreciable plastic trim)
Baked Goods
Cookies, cakes, pies
- Frozen, packaged in cartons*
Batteries
Dry cells (nonlithium or similar exotic metals) in
blister pack in cartons
Bottles, Jars
Filled noncombustible powders
- Plastic PET
Boxes, Crates
Empty, wood, solid walls
Fertilizers
Bagged
- Nitrates
Fish or Fish Products
Frozen
- Waxed-paper containers, cartoned
- Boxed or barreled
Frozen Foods
Waxed-paper containers, cartoned
Leather Hides
Baled
Light Fixtures
Nonplastic
- Cartoned
Marble
Artifi cial sinks, countertops
- Cartoned, crated
Meat, Meat Products
- Frozen, waxed-paper containers
- Frozen, expanded plastic trays
Pharmaceuticals
Pills, powders
- Glass bottles, cartoned
Nonfl ammable liquids
- Glass bottles, cartoned
Photographic Film
- Motion picture or bulk rolls of fi lm in polycarbon-
ate, polyethylene, or metal cans; polyethylene
bagged in cardboard boxes
Plastic Containers
Noncombustible liquids or semiliquids (such as
ketchup) in plastic containers with nominal wall
thickness of L/4 in. (6.4 mm) or less and larger
than 5 gal (18.9 L) capacity
Poultry Products
Frozen (on paper or expanded plastic trays)
Powders (ordinary combustibles - free fl owing)
In paper bags (e.g., fl our, sugar)
Salt
Packaged, cartoned
Shock Absorbers
Metal dust cover
Signatures
Book, magazines
- Solid array on pallet
Syrup
Barreled, wood
Wire
- Bare wire on wood or cardboard spools on
wood skids
- Bare wire on metal, wood, or cardboard spools
in cardboard boxes on wood skids
- Single- or multiple-layer PVC-covered wire on
metal spools on wood skids
- Insulated (PVC) cable on large wood or metal
spools on wood skids
Wood Products
Solid piles
- Lumber, plywood, particle board, pressboard
(smooth ends and edges)
*The product is in a plastic-coated package in a
corrugated carton. If packaged in a metal foil, it can
be considered Class I.
Page 24
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Where the building has separate cooler and freezer areas, it will be necessary to install additional
bypass check valves to prevent thermal transfer and frosting from one area to another.
March 7, 2008
Page 25
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
The detection system shall consist of low temperature “spot” type heat detectors, air sampling
smoke detection or beam smoke detection. Linear heat detection is not suitable for this system
and shall not be used.
Viking does not have a preferred manufacturer of initiating devices. Spot heat detectors are
typically not subject to compatibility issues with the release control panel. Viking considers all
listed and approved spot type heat detectors that the manufacturer determines is appropriate for
cold storage applications acceptable. The detection system shall be designed to allow the heat
detectors to operate prior to the Viking K25.2 ESFR sprinklers by selecting a lower temperature
rating and RTI for the heat detector. (NFPA 13 defines an ESFR Sprinkler as having a thermal
element with an RTI of 50 (meters sec.½) or less.) The heat detector manufacturer shall be contacted for the heat detector RTI information.
Air sampling systems are also considered acceptable for activation of the ESFR Cold Storage
System, and should be designed in accordance with the manufacturer’s instructions.
The detection system shall be designed in accordance with the requirements of NFPA 72.
5.6.2.3 Marking: Heat-sensing fire detectors shall be marked with their listed operating temperature. Spot-type heat detectors shall also be marked with their RTI (response time index). The
RTI marking requirements shall have an effective date of July 1, 2008.
5.6.5.5.1 On ceilings 10 ft to 30 ft (3 m to 9.1 m) high, heat detector linear spacing shall be
reduced in accordance with Table 5.6.5.5.1 prior to any additional reductions for beams, joists,
or slope, where applicable.
5.6.5.5.2 The minimum spacing of heat detectors shall not be required to be less than 0.4 times
the height of the ceiling.
Table 4 - Detector Classification from NFPA 72
Table 5.6.2.1.1 Temperature Classifi cation for Heat-Sensing Fire Detectors
Temperature
Classifi cation
Low*100-13439-578028Uncolored
Ordinary135-17458-7911547Uncolored
Intermediate175-24980-12115569White
High250-324122-162230111Blue
Extra high325-399163-204305152Red
Very extra high400-499205-259380194Green
Ultra high500-575260-302480249Orange
*Intended only for installation in controlled ambient areas. Units shall be marked to indicate maximum ambient installation
temperature.
Temperature Rating RangeMaximum Ceiling TemperatureColor
° F° C° F° C
Code
March 7, 2008
Page 27
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
INTERLOCK PREACTION
COLD STORAGE SYSTEM
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
A listed indicating valve shall be installed on the upstream side of the deluge valve. The valve
shall not close in less than 5 seconds when operated at maximum possible speed from the fully
opened position. Valves shall conform to the requirements of NFPA 13 (8.16.1.1.2 2007 ed.):
8.16.1.1.2* Supervision.
8.16.1.1.2.1 Valves on connections to water supplies, sectional control and isolation valves, and
other valves in supply pipes to sprinklers and other fixed water-based fire suppression systems
shall be supervised by one of the following methods:
Central station, proprietary, or remote station signaling service
1)
Local signaling service that will cause the sounding of an audible signal at a constantly at-
2)
tended point
Valves locked in the correct position
3)
Valves located within fenced enclosures under the control of the owner, sealed in the open
4)
position, and inspected weekly as part of an approved procedure
Figure 19 - Water
Supply Control Valve
2. Grooved Couplings
In order to prevent leaks and preserve the antifreeze solution, it is imperative that grooved pipe
ends are smooth, round, and free of burrs, flat spots, and weld seam imperfections. Also, pipes
should be capped to prevent contaminant during shipping, storage, etc. Verify that any gasket
materials used in couplings, etc. are compatible with the antifreeze solution. Refer to the antifreeze solution technical data page.
Where grooved couplings are used in the system, “flush seal” gasket, low temperature EPDM
rubber and lube are required. Gaskets: grade “E” EPDM, NSF-61 Certified, -40 °F to 230 °F (service temperature range) (-40 °F to 110 °F) recommended for water service, diluted acids, alkalys
solutions, oil-free air and many chemical services. GRUVLOK Xtrema Lubricant is required for
freezer applications. In order to pervent leaks and preserve the antifreeze solution, the grooved
pipe ends must be smooth, round, and free of burrs.
March 7, 2008
ESFR PRE-PRIMED SINGLE
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058