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Technical Information
DPL116
877.963.4966 •
dixonvalve.comW
843
CFM vs PSI for Nozzles
•
PSI = pounds/square inch
•
CFM = cubic feet/minute
Air Velocity in a Pipe
Using the equation and typical values of V, D and L explained to the right approximate values of P are computed as follows:
V = air velocity in feet per second
D = pipe inside diameter in inches
L = length of pipe in feet
P = pressure loss due to air friction in ounces/square inch
formula from B.F.Sturtevant Company
V = 25,000 DP
L
v
Air Volume Discharged from Pipe
CFM = air volume in cubic feet per minute
V = air velocity in feet per second as determined in the
equation at the top of this page
A = cross section area of pipe in square feet
CFM = 60VA
Boyle's Law
If temperature is kept constant, the volume of a given mass of
gas is inversely proportional to the pressure which is exerted
upon it.
Initial Pressure
Final Pressure
Final Volume
Initial Volume
=
Formulas
Gauge
PSI
CFM Free Air Flow @ Nozzle Diameter (Inch)
1/64
1/32
3/64
1/16
3/32
1/8
3/16
1/4
1
.03
.11
.2
.4
1.0
1.7
3.9
6.8
5
.06
.24
.5
1.0
2.2
3.9
8.7
15.4
10
.08
.34
.8
1.4
3.1
5.4
12.3
21.8
15
.10
.42
.9
1.6
3.7
6.6
15.0
26.7
20
.12
.48
1.1
1.9
4.2
7.7
17.1
30.8
25
.13
.54
1.2
2.2
4.7
8.6
19.4
34.5
30
.16
.63
1.4
2.5
5.6
10.0
22.5
40.0
40
.19
.77
1.7
3.1
6.8
12.3
27.5
49.1
50
.22
.91
2.0
3.6
8.2
14.5
32.8
58.2
60
.26
1.05
2.3
4.2
9.4
16.8
37.5
67.0
70
.29
1.19
2.7
4.8
10.7
19.0
43.0
76.0
80
.33
1.33
3.0
5.3
11.9
21.2
47.5
85.0
90
.36
1.47
3.3
5.9
13.1
23.5
52.5
94.0
100
.40
1.61
3.7
6.4
14.5
25.8
58.3
103.0
110
.43
1.76
3.9
7.0
15.7
28.0
63.0
112.0
120
.47
1.90
4.30
7.6
17.0
30.2
68.0
121.0
130
.50
2.04
4.6
8.1
18.2
32.4
73.0
130.0
140
.54
2.17
4.9
8.7
19.5
34.5
78.0
138.0
150
.57
2.33
5.2
9.2
20.7
36.7
83.0
147.0
175
.66
2.65
5.9
10.6
23.8
42.1
95.0
169.0
200
.76
3.07
6.9
12.2
27.5
48.7
110.0
195.0
Velocity
Ft/Sec
Pipe Diameter in Inches, 10' long
1
2
4
6
10
1
.0004 .0002 .0001 .00007 .00004
2
.0016 .0008 .0004 .00030 .00016
5
.0100 .0050 .0025 .00170 .0010
10
.0400 .0200 .0100 .00670 .0040
15
.0900 .0450 .0225 .01500 .0090
20
.1600 0080 .0400 .02700 .0160
25
.2500 .1250 .0625 .04170 .0250
30
.3600 .1800 .0900 .06000 .0360