TECHNICAL DATA
3” MODEL G-3000P
DOUBLE INTERLOCK PREACTION
WITH ELECTRIC/PNEUMATIC RELEASE
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: [email protected]
Page 3 of 12
Form No. F_011610 18.10.25 P65
a valve house (enclosure) with adequate heat around the
G-3000P Valve and trim. Freezing temperatures will dam-
age the G-3000P Valve.
When corrosive atmospheres and/or contaminated water
supplies are present, it is the owner’s responsibility to
verify compatibility with the Model G-3000P Valve and
associated equipment.
4. The Viking E-1 Accelerator should be installed at the location indicated in Figure 1 when required.
B. Air Supply Design
1. Air Compressor Size
Viking recommends tank-mounted air compressors be supplied for double interlock electric/pneumatic release preaction systems. The
pneumatic actuator requires at least 30 PSI (2.1 bar) of air pressure be established within the piping network for systems with water
pressure up to 175 PSI (12.1 bar) and 50 PSI (3.45 bar) of air pressure for systems with water pressures up to 250 PSI (17.2 bar).
NFPA 13 requires that the air supply be capable of filling the entire sprinkler system to its required air pressure within 30 minutes. A
common method of sizing an air compressor is to use the following formula:
Where:
V = Volume
P = Required Air Pressure
T = Fill time (typically 30 min.)
7.48 = gal. / ft.
3
14.7 = atmospheric pressure
Compressor
Size (cfm) =
V x P
7.48 x 14.7 x T
Therefore, the compressor shall be capable of providing 7 cfm.
2. Nitrogen Cylinder Gas Supply
(See Figure 1)
Nitrogen may be used in place of air compressors. Nitrogen is supplied in pressurized cylinders in various sizes and pressures. Some
of the most common are 122 Cu. Ft. at 1,900 PSI (3,455 L at 131 bar), 225 Cu. Ft. at 2,100 PSI (6,372 L at 145 bar), and 280 Cu. Ft.
at 2,300 PSI (7,930 L at 159 bar).
When nitrogen cylinders are used as a primary air supply, spare cylinders should be furnished and located at the valve location.
To determine the approximate amount of nitrogen to be furnished, the following formula may be used:
Table 1 - Pipe Capacity for Sizing Air Compressors
Pipe Diameter
Capacity
US
International
Schedule 40 (1” to 6”)
Schedule 30 (8”)
Schedule 10
Gal / Ft
L / m
Gal / Ft L / m
1”
DN25
0.045
0.559
0.049
0.608
1-1/4”
DN32
0.078
0.969
0.085
1.043
1-1/2”
DN40
0.106
1.316
0.115
1.428
2”
DN50
0.174
2.161
0.190
2.360
2-1/2”
DN65
0.248
3.080
0.283
3.515
3”
DN80
0.383
4.756
0.434
5.390
3-1/2”
DN90
0.513
6.370
0.577
7.165
4”
DN100
0.660
8.196
0.740
9.190
5”
DN125
1.040
12.915
1.144
14.206
6”
DN150
1.501
18.640
1.649
20.477
8”
DN200
2.660
33.032
2.776
30.472
For Metric Units 1 Ft. = 0.3048 M, 1 Gal. = 3.785 L
Table 3 - Quick Reference Compressor Size
Compressor
Size (HP)
Free Air @ 40
PSI (2.8 bar)
(cfm)
Max System Size to Pump
to 40 PSI (2.8 bar) in 30
Minutes (Gal)
1/6
1.0
90
1/3
2.0
180
1/2
3.1
300
1
5.9
600
Table 2 - Air
Pressure Settings
System Pressure
Up to 175 PSI
(12 bar)
175 PSI (12 bar)
to 250 PSI (17 bar)
For Systems with Tank Mounted Compressors:
Air Maintenance Device 30 PSI (2.1 bar)
50 PSI (3.5 bar)
Air Supervisory Switch 25 PSI (1.7 bar)
45 PSI (3.1 bar)
For Systems with Riser Mounted Compressors:
Compressor On / Off
Switch
30 PSI (2.1 bar) /
40 PSI (2.8 bar)
50 PSI (2.1 bar) /
60 PSI (2.8 bar)
Air Supervisory Switch 25 PSI (1.72 bar) 45 PSI (3.10 bar)
Example:
System volume as determined by table 1 = 750 gallons
Required Air pressure = 30 PSI (2.1 bar)
Compressor Size (cfm) =
(750 x 30)
= 6.8 cfm
7.48 x 14.7 x 30
English Units
Vc =
Vs x P
Where:
Vc = Volume of Cylinder (ft
3
)
P = Required Nitrogen Pressure (PSI)
V = Volume of System (gal)
100
Metric Units
Vc =
Vs x P
Where:
Vc = Volume of Cylinder (L)
P = Required Nitrogen Pressure (bar)
V = Volume of System (L)
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