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March 7, 2008
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Telephone: 269-945-9501 Technical Services 877-384-5464 Fax: 269-945-4495 Email: techsvcs@vikingcorp.com
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
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.
Capacity of 1 ft. of Pipe (Based on Actual Internal Pipe Diameter)
Nominal
Pipe
Diameter
Schedule 40
in.
mm
3/4
20
1
25
1¼
32
1½
40
2
50
2½
65
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
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.
TECHNICAL DATA
From NFPA 13 - Table A.7.2.3 -
Pipe
Schedule 10
(gal)
(gal)
0.028
-
0.045
0.049
0.078
0.085
0.106
0.115
0.174
0.190
0.248
0.283
®
Check Valve (lines in bold) at the base of the riser is
Table 1
Nominal
Pipe
Diameter
Schedule 40
in.
mm
3
80
3½
90
4
100
5
125
6
150
8
200
2
in area, with long runs on feed main, typically
ESFR PRE-PRIMED SINGLE
INTERLOCK PREACTION
COLD STORAGE SYSTEM
Pipe
Schedule 10
(gal)
(gal)
0.383
0.433
0.513
0.576
0.660
0.740
1.040
1.144
1.501
1.649
2.66
a
2.776
Page 17
b
c
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