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13.1 Table 1 Approximate Air Consumption (cfm) Per Blast Nozzle
NOZZLE PRESSURE
NOZZLE SIZE
60 psi
70 psi
80 psi
90 psi
100 psi
120 psi
140 psi
No.2 1/8"
14
16
18
20
22
26
30
No.3 3/16"
32
36
41
45
49
58
66
No.4 1/4"
57
65
72
80
90
105
121
No.5 5/16"
90
101
113
125
140
160
185
No.6 3/8"
126
145
163
182
200
235
270
No.7 7/16"
170
193
215
240
270
315
360
No.8 1/2"
230
260
290
320
350
410
470
No.10 5/8"
360
406
454
500
550
640
740
No.12 3/4"
518
585
652
720
790
925
1060
13.2 Table 2 Abrasive Consumption (lbs. per hour) Per Blast Nozzle
NOZZLE PRESSURE
NOZZLE SIZE
60 psi
70 psi
80 psi
90 psi
100 psi
120 psi
140 psi
No.2 1/8"
90
105
115
130
140
165
190
No 3 3/16"
205
230
260
290
320
375
430
No.4 1/4"
365
420
460
500
560
660
760
No.5 5/16"
575
650
725
825
900
1050
1200
No.6 3/8"
840
945
1050
1155
1260
1475
1700
No.7 7/16"
1150
1300
1450
1600
1750
2050
2350
No.8 1/2"
1460
1660
1850
2000
2250
2650
3000
No.10 5/8"
2290
2600
2900
3125
3520
4100
4750
No.12 3/4"
3300
3750
4180
4500
5060
5950
6800
13.3 Table 3 Hose Selection Guide (blasting @ 100 Psi)
NOZZLE SIZE
No.4 1/4"
No.5 5/16"
No.6 3/8"
No.7 7/16"
No.8 1/2"
CFM @ 100psi
90
140
200
270
350
AIR HOSE
1 1/4"
1 1/4"
1 1/2"
1 1/2"
2"
BLAST HOSE
1"
1 1/4"
1 1/4"
1 1/2"
1 1/2"
ABRASIVE (lbs. per hr.)
560
900
1260
1750
2250
13.4 Additional Information on Blasting Productivity
Air volume and pressure are very important. The blasting production rate will increase with
higher blasting pressures and decrease with lower blasting pressures. The National
Association of Corrosion Engineers’ data suggests that for each 1 psi reduction in nozzle
pressure, there is a 1.5% production loss. Pressure drop through a Schmidt® blast unit is
normally less than 1 psi, while blast units manufactured by some of our competitors have
pressure losses as high as 12 psi resulting in an 18% loss of production. Air pressure loss can
also be avoided by using the shortest possible hose of adequate size. The inside diameter of
both the blast hose (other than whip hose) and the air hose should be approximately three
times the diameter of the orifice in the blast nozzle.
Standard Schmidt blast units are rated for a maximum pressure of 150 psi. However,
equipment manufactured prior to 2005 can be rated at 125psi. Refer to pressure vessel
nameplate.
13.0 Blasting Data
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