Technical data

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
Page 17
March 7, 2008
2. Determining the Required Volume of Propylene Glycol
Table 1
From NFPA 13 - Table A.7.2.3 -
Capacity of 1 ft. of Pipe (Based on Actual Internal Pipe Diameter)
Nominal
Pipe
Diameter
Pipe
Nominal
Pipe
Diameter
Pipe
in. mm
Schedule 40
(gal)
Schedule 10
(gal)
in. mm
Schedule 40
(gal)
Schedule 10
(gal)
3/4 20 0.028 - 3 80 0.383 0.433
1 25 0.045 0.049 3½ 90 0.513 0.576
1¼ 32 0.078 0.085 4 100 0.660 0.740
1½ 40 0.106 0.115 5 125 1.040 1.144
2 50 0.174 0.190 6 150 1.501 1.649
b
2½ 65 0.248 0.283 8 200 2.66
a
2.776
c
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.
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 ft
2
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.
•
•
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.