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