Technical data

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TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Telephone: [phone] Technical Services 877-384-5464 Fax: [phone] Email: [e-mail]
ESFR PRE-PRIMED SINGLE
INTERLOCK PREACTION
COLD STORAGE SYSTEM
March 7, 2008
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.
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 calcula-
tion 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, fric-
tion 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