Marco Blastmaster 950 CFM, Operator'S Manual

Blastmaster

®

 950 CFM Air Dryer

6

Failure to comply with ANY NOTICE listed below could pose a hazard to personnel or property.

 

See Air & Abrasive Consumption Chart for estimated abrasive consumption rates and required air flow 

(cubic feet per minute). Your system must meet these minimum requirements to ensure proper function and 

performance.

 

When it comes to air & abrasive mixtures, more is not necessarily better.  Optimum abrasive blasting efficiency 

takes place when a lean air & abrasive mixture is used. To correctly set the abrasive metering valve, begin 

with the valve fully closed and slowly increase the amount of abrasive entering the airstream. As you increase 

the abrasive flow, watch for a “blue flame” at the exit of the abrasive blasting nozzle. Faster cutting, reduced 

abrasive consumption and lower clean up costs, are benefits of the “blue flame”.

 

Abrasive blasting at optimal pressure for the abrasive used is critical to productivity. Example: For an abrasive 

with an optimal abrasive blasting pressure of 100 psi at the abrasive blasting nozzle, one pound per square inch 

of pressure loss will reduce abrasive blasting efficiency by 1.5%. A 10 psi reduction in air pressure will cause a 

15% loss of efficiency. Use a Needle Pressure Gauge to identify pressure drops in your system. Consult with 

your abrasive supplier for the requirements of your abrasive.

*Abrasive consumption is based on abrasive with a bulk density of 100 lbs per Cubic Foot

Air & Abrasive Consumption Chart*

Nozzle
Orifice

Pressure at the Nozzle (PSI)

Air (in cfm), Abrasive 

& Compressor 

Requirements

50

60

70

80

90

100

125

140

No. 2

(1/8ˮ)

11

67

2.5

13

77

3

15

88

3.5

17

101

4

18

112

4.5

20

123

5

25

152

5.5

28

170

6.2

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 3

(3/16ˮ)

26

150

6

30

171

7

33

196

8

38

216

9

41

238

10

45

264

10

55

319

12

62

357

13

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 4

(1/4ˮ)

47

268

11

54

312

12

61

354

14

68

408

16

74

448

17

81

494

18

98

608

22

110

681

25

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 5

(5/16ˮ)

77

468

18

89

534

20

101

604

23

113

672

26

126

740

28

137

812

31

168

982

37

188

1100

41

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 6

(3/8ˮ)

108

668

24

126

764

28

143

864

32

161

960

36

173

1052

39

196

1152

44

237

1393

52

265

1560

58

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 7

(7/16ˮ)

147

896

33

170

1032

38

194

1176

44

217

1312

49

240

1448

54

254

1584

57

314

1931

69

352

2163

77

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 8

(1/2ˮ)

195

1160

44

224

1336

50

252

1512

56

280

1680

63

309

1856

69

338

2024

75

409

2459

90

458

2754

101

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 10 

(5/8ˮ)

308

1875

68.5

356

2140

79.5

404

2422

90

452

2690

100.5

504

2973

112

548

3250

122

663

3932

146

742

4405

165

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

No. 12 

(3/4ˮ)

432

2672

96

504

3056

112

572

3456

127

644

3840

143

692

4208

154

784

4608

174.5

948

5570

209

1062

6238

236

Air (cfm)

Abrasive (lbs/hr)

Compressor Horsepower

Inspect abrasive 

blasting nozzle before 

placing into service. 

Damage to abrasive 

blasting nozzle liner 

or jacket may occur 

during shipping. If you 

receive a damaged 

abrasive blasting nozzle, 

contact your distributor 

immediately for 

replacement. Abrasive 

blasting nozzles placed 

into service may not 

be returned. Abrasive 

blasting nozzle liners 

are made of fragile 

materials and can be 

damaged by rough 

handling and striking 

against hard surfaces. 

Never use a damaged 

abrasive blasting nozzle.

Replace abrasive 

blasting nozzle if liner 

or jacket is cracked 

or damaged. Replace 

abrasive blasting nozzle 

if original orifice size 

has worn 1/16” or more. 

Determine abrasive 

blasting nozzle wear by 

inserting a drill bit 1/16” 

larger than original size 

of abrasive blasting 

nozzle orifice. If the 

drill bit passes through 

abrasive blasting nozzle, 

replacement is needed.

“Blue Flame”

AIR & ABRASIVE CONSUMPTION CHART