Operation
3A4802D 15
Blast Pressure vs. Air Flow Chart
How to use the Tables 3 and 4:
1. Determine air flow based on blast pressure, blast hose and nozzle size from Table 1 or 2.
2. Determine pressure drop based on air flow using Table 3 or 4.
TABLE 1:
1/2 in. (12.7 mm) ID Blast Hose
Gauge Nozzle
Blasting Pressure
#3 CFM
(m^3/min)
#4 CFM
(m^3/min)
#5 CFM
(m^3/min)
30 p s i
(2.0 bar, 0.20 MPa)
44
(1.2)
40 p s i
(2.8 bar, 0.28 MPa)
44
(1.2)
53
(1.5)
50 p s i
(3.5 bar, 0.35 MPa)
30
(.85)
51
(1.4)
62
(1.8)
60 p s i
(4.1 bar, 0.41 MPa)
37
(1.0)
58
(1.6)
68
(1.9)
70 p s i
(4.8 bar, 0.48 MPa)
43
(1.2)
63
(1.8)
73
(2.1)
80 p s i
(5.5 bar, 0.55 MPa)
49
(1.4)
69
(2.0)
79
(2.2)
90 p s i
(6.2 bar, 0.62 MPa)
52
(1.5)
73
(2.1)
92
(2.6)
1 0 0 p s i
(6.9 bar, 0.69 MPa)
57
(1.6)
77
(2.2)
108
(3.1)
1 1 0 p s i
(7.6 bar, 0.76 MPa)
60
(1.7)
83
(2.4)
1 2 0 p s i
(8.3 bar, 0.83 MPa)
63
(1.8)
98
(2.8)
1 3 0 p s i
(9.0 bar, 0.90 MPa)
66
(1.9)
105
(3.0)
TABLE 2:
1 in. (25.4 mm) ID Blast Hose
Gauge Nozzle
Blasting Pressure
#5 CFM
(m^3/min)
#6 CFM
(m^3/min)
#7 CFM
(m^3/min)
#8 CFM
(m^3/min)
30 p s i
(2.0 bar, 0.20 MPa)
1 0 8
(3.1)
40 p s i
(2.8 bar, 0.28 MPa)
1 0 9
(3.1)
1 3 8
(3.9)
50 p s i
(3.5 bar, 0.35 MPa)
1 0 8
(3.1)
1 3 9
(3.9)
1 5 9
(4.5)
60 p s i
(4.1 bar, 0.41 MPa)
1 2 4
(3.5)
1 5 2
(4.3)
1 8 3
(5.2)
70 p s i
(4.8 bar, 0.48 MPa)
1 0 4
(2.9)
1 3 9
(3.9)
1 6 9
(4.8)
2 0 9
(5.9)
80 p s i
(5.5 bar, 0.55 MPa)
1 2 2
(3.5)
1 5 3
(4.3)
1 9 0
(5.4)
2 3 6
(6.7)
90 p s i
(6.2 bar, 0.62 MPa)
1 4 2
(4.0)
1 6 6
(4.7)
2 1 3
(6.0)
2 6 2
(7.4)
10 0 p s i
(6.9 bar, 0.69 MPa)
1 4 8
(4.2)
1 8 0
(5.1)
2 3 2
(6.6)
2 9 6
(8.4)
11 0 p s i
(7.6 bar, 0.76 MPa)
1 5 7
(4.4)
1 9 8
(5.6)
2 5 3
(7.2)
- - - -
12 0 p s i
(8.3 bar, 0.83 MPa)
1 6 6
(4.7)
2 1 5
(6.1)
- - - - - - - -
13 0 p s i
(9.0 bar, 0.90 MPa)
- - - - - - - - - - - - - - - -
= Not a recommended hose and nozzle combination for given pressure.
TABLE 3:
Pressure drop from the Blast Pressure Gauge to Nozzle using a 50 ft - 1/2 in. ID
(15.2 m - 12.7 mm ID) Blast Hose Dependent on Air Flow
Air Flow
CFM
(m^3/min)
30
(.84)
40
(1.12)
50
(1.4)
60
(1.70)
70
(1.98)
80
(2.27)
90
(2.55)
100
(2.83)
110
(3.11)
120
(3.39)
130
(3.68)
140
(3.96)
Pressure Drop
psi
(bar)
3
(.207)
5
(.345)
7
(.483)
10
(.689)
13
(.896)
17
(1.17)
20
(1.38)
25
(1.72)
30
(2.07)
35
(2.41)
40
(2.76)
45
(3.10)
TABLE 4:
Pressure drop from the Blast Pressure Gauge to Nozzle using a 50 ft - 1 in. ID
(15.2 m - 25.4 mm ID) Blast Hose Dependent on Air Flow
Air Flow
CFM
(m^3/min)
100
(2.83)
120
(3.40)
140
(3.96)
160
(4.53)
180
(5.10)
200
(5.66)
220
(6.23)
240
(6.80)
260
(7.36)
280
(7.93)
Pressure Drop
psi
(bar)
12
(.827)
14
(.965)
16
(1.10)
18
(1.24)
20
(1.38)
22
(1.52)
23
(1.59)
24
(1.65)
26
(1.79)
27
(1.86)
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