Reference Info.

 

Nozzle
Orifice
Pressure at the Nozzle (psi) Air (In cfm)
Abrasive
& HP requirements
50 60 70 80 90 100 125 150
No. 2
(1/8")
11
.57
67
2.5
13
.77
77
3
15
.88
88
3.5
17
1.01
101
4
18.5
1.12
112
4.5
20
1.23
123
5
25
1.52
152
5.5
30
1.82
182
6.6
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 3
(3/16")
26
1.5
150
6
30
1.71
171
7
33
1.96
196
8
38
2.16
216
9
41
2.38
238
10
45
2.64
264
10
55
3.19
319
12
62
3.83
383
14
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 4
(1/4")
47
2.68
268
11
54
3.12
312
12
61
3.54
354
14
68
4.08
408
16
74
4.48
448
17
81
4.94
494
18
98
6.08
608
22
118
7.30
730
26
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 5
(5/16")
77
4.68
468
18
89
5.34
534
20
101
6.04
604
23
113
6.72
672
26
126
7.40
740
28
137
8.12
812
31
168
9.82
982
37
202
1.178
1178
44
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 6
(3/8")
108
6.68
668
24
126
7.64
764
28
143
8.64
864
32
161
9.60
960
36
173
10.52
1052
39
196
11.52
1152
44
237
13.93
1393
52
284
1.672
1672
62
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 7
(7/16")
147
8.96
896
33
170
10.32
1032
38
194
11.76
1176
44
217
13.12
1312
49
240
14.48
1448
54
254
15.84
1584
57
314
19.31
1931
69
377
2.317
2317
83
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp
No. 8
(1/2")
195
11.60
1160
44
224
13.36
1336
50
252
15.12
1512
56
280
16.80
1680
63
309
18.56
1856
69
338
20.24
2024
75
409
24.59
2459
90
491
2.951
2951
108
Air (cfm)
Abrasive (cu.ft./hr
& Lbs/hr)
Compressor hp

 

Minimum Compressor Air Line Diameter

Nozzle No. Nozzle Orifice Size Minimum Air Line ID
No. 3 3/16" (5.0mm) 1" (25.0mm)
No. 4 1/4" (6.5mm) 1" (25.0mm)
No. 5 5/16" (8.0mm) 1-1/4" (32.0mm)
No. 6 3/8" (9.5mm) 1-1/2" (38.0mm)
No. 7 7/16" (11.0mm) 2" (50.0mm)
No. 8 1/2" (12.5mm) 2" (50.0mm)
No. 10 5/8" (16.0mm) 2-1/2" (64.0mm)
No. 12 3/4" (19.0) 3" (76.0mm)

 Effects of Nozzle Wear on Air Consumption

Nozzle No. Orifice Size Air Flow
in CFM
Increase in Air Consumption
No. 4 1/4" (6.5mm) 81 cfm  
No. 5 5/16" (8.0mm) 137 cfm 69% more than No.4
No. 6 3/8" (9.5mm) 196 cfm 43% more than No.5
No. 7 7/16" (11.0mm) 254 cfm 29% more than No.6
No. 8 1/2" (12.5mm) 338 cfm 33% more than No.7

Blast System Air Volume Estimates

Nozzle Size of
Orifice
Volume
of Air
Plus
Helmet
Plus 50%
(reserve)
Minimum Air
Required
No. 4 1/4"
6.5mm
81
2.3
20
0.5
50
1.4
151 cfm
4.2 m3/min
No. 5 5/16"
8.0mm
137
3.9
20
0.5
79
2.2
236 cfm
6.6m3/min
No.6 3/8"
9.5mm
196
5.5
20
0.5
108
3.0
324 cfm
9.0 m3/min
No. 7 7/16"
11.0mm
254
7.2
20
0.5
137
3.9
411 cfm
11.6 m3/min
No. 8 1/2"
12.5mm
338
9.6
20
0.5
179
5.0
537 cfm
16.1 m3/min

Abrasives Characteristics Comparison

Material Mesh
Size
Shape Density
lbs/ft3
Mohs Friability Init.
Cost
No. of
Cycles
Per use
Cost
Source Typical
Applications
Sil. Sand 6-270 X 100 5.0-6.0 high low 1 med. nat. Outdoor blast cleaning
Min. Slag 8-80 X 85-112 7.0-7.5 high med. 1-2 med. b-p Outdoor blast cleaning
Steel Grit 10-325 X 230 8.0 low high 200+ med. mfg. Removing heavy scale
Steel Shot 8-200 O 280 8.0   high 200+ low mfg. Cleaning, peening
Al. Oxide 12-325 X 125 9.0 med. high 6-8 med. mfg. Cleaning, finishing,
deburring, etching
Silicon Carbide 12-325 X 110 9.5 med. high 5-6 med. mfg. Surface preparation on
extremely hard substrates
Glass Bead 10-400 O 85-90 5.5-6.0 med. med. 8-10 low mfg. Cleaning, finishing
Plastic 12-80 X 45-60 3.0-4.0 low/med. high 8-10 med. mfg. Paint stripping,
deflashing, cleaning
Wheat Starch 12-80 X 45 3.0 med. med. 12-15 high mfg. Paint, adhesive removal;
composites
XL­Corn Hybrid Polymer 16-60 X 45 3.0 low high 14-17 med. mfg. Composite paint removal, adhesive deflash
Corn Cob 8-40 X 35-45 2.0-4.5 med. low 4-5 low b-p Removing paint from
delicate surfaces
 X=Angular O= Spherical     nat.=Natural     b-p=By-product     mfg.=Manufactured