21R0101-0001_Attachment2_File_No_2_SSPC_SP10_NACE_No2_Degrees_of_Cleaness.pdf

KEY: Steel where mill scale has started to flake and light rusting occurs.

BRUSH-OFF

COMMERCIAL

NEAR-WHITE METAL

WHITE METAL

BRUSH-OFF

COMMERCIAL

NEAR-WHITE METAL

WHITE METAL

BRUSH-OFF

COMMERCIAL

NEAR-WHITE METAL

WHITE METAL

KEY: Steel where all mill scale has flaked off and complete rusting has occured.

KEY: Steel where pitting and complete rusting has taken place.

BRUSH-OFF

Tightly adherent mill scale and rust may remain on the surface. Mill scale and rust are considered adherent if they cannot be removed with a dull putty knife.

SSPC-SP 7

NACE No. 4

SA-1

COMMERCIAL

Evenly dispersed very light shadows, streaks and discolorations caused by stains of rust and mill scale may remain on no more that 33% of the surface.

SSPC-SP 6

NACE No. 3

SA-2

NEAR-WHITE METAL

Evenly dispersed very light shadows, streaks and discolorations caused by stains of rust and mill scale may remain on 5% of the surface.

SSPC-SP 10

NACE No. 2

SA-2-1/2

WHITE METAL

Free of all visible oil, grease, dirt, dust, mill scale and rust.

SSPC-SP 5

NACE No. 1

SA-3

For the complete official guide to surface cleanliness, refer to SSPC-Vis-1: Guide and reference photographs for dry abrasive blast cleaning; SSPC Publication 02-12, www.sspc.org

*Images shown are previously uncoated surfaces, viewed without magnification.

Degrees of Cleanliness of Blast-Cleaned Surfaces*

ISO 9001 certified. Clemco is committed to continuous product improvement.

©2016 Clemco Industries Corp. • One Cable Car Drive • Washington, MO 63090 • Phone: 636.239.4300 • Fax: 800.726.7559

Stock No. 21932 Rev. F 10/16www.clemcoindustries.com

Nozzle Orifice

PRESSURE AT THE NOZZLE (PSI)

Air (cfm) Abrasive

Use Compressor HP50 60 70 80 90 100 125 140

No. 2 (1/8”)

.67 2.5

.77

.88 3.5

1.01

18.5 1.12 4.5

1.23

1.52 5.5

1.70 6.2

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 3 (3/16”)

1.50

1.71

1.96

2.16

2.38

2.64

3.19

3.57

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 4 (1/4”)

2.68

3.12

3.54

4.08

4.48

4.94

6.08

6.81

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 5 (5/16”)

4.68

5.34

6.04

6.72

7.40

8.12

9.82

11.0

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 6 (3/8”)

6.68

7.64

8.64

9.60

10.52

11.52

13.93

15.60

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 7 (7/16”)

8.96

10.32

11.76

13.12

14.48

15.84

19.31

21.63

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

No. 8 (1/2”)

11.60

13.36

15.12

16.80

18.56

20.24

24.59

27.54

Air (cfm) Abrasive (cuft/hr.)

Abrasive (lbs./hr.)

Compressor hp

C om pr es se d

Ai r a nd A br as iv e

C on su m pt io n Ab ra si ve C om pa ris on

System Air Volume Requirements @ 100 psi Minimum Compressor Air Line Sizes

Pressure Loss in Air Hose

Impact of Nozzle Wear on Air Consumption

I.D. Pressure Loss Production Loss

3/4” 11.1 psi 16.6%

1” 2.4 psi 3.6%

1-1/4” 0.7 psi 1.0%

1-1/2” 0.2 psi 0.3%

Based on 150 cfm @ 100 psi through 50 feet of compressor air hose.

For maximum efficiency, provide large air lines from the compressor to the blast machine. Place the compressor as near as possible to the blast operation. Use the largest air hose available.

Nozzle Orifice Size Increase in Air Consumption

No. 4 1/4” (6.5mm)

No. 5 5/16” (8.0mm) 60% or more than No. 4

No. 6 3/8” (9.5mm) 38% more than No. 5

No. 7 7/16” (11.0mm) 36% more than No. 6

No. 8 1/2” (12.5mm) 33% more than No. 7

Nozzle Orifice

Size Volume of Air

Plus Helmet

Plus 50% (Reserve)

Min. Air Requirement

No. 4 1/4” (6.5mm)

2.3

0.5

1.4

151 cfm

4.2 m3/min

No. 5 5/16” (8.0mm)

3.9

0.5

2.2

236 cfm

6.6 m3/min

No. 6 3/8” (9.5mm)

5.5

0.5

3.0

324 cfm

9.0 m3/min

No. 7 7/16” (11.0mm)

7.2

0.5

3.9

411 cfm

11.6 m3/min

No. 8 1/2” (12.5mm)

9.6

0.5

5.0

537 cfm

16.1 m3/min

Nozzle Nozzle Orifice Size Min. Air Line I.D.

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” (19.0mm) 3” (76.0mm)

Material Mesh Size Shape Density lbs/ft3 Mohs Friablility # of Cycles Source Typical Applications

Silica Sand* 6-270 u 100 5.0—6.0 High 1 Natural Outdoor blast cleaning

Min. Slag 8-80 u 85-112 7.0—7.5 High 1—2 By-product Outdoor blast cleaning

Garnet 8-300 u 130-145 7.0 Medium 2—2.5 Natural Cleaning, finishing, deburring, etching

Steel Grit 10-325 u 230 8.0 Low 200+ Manufactured Removing heavy scale

Garnet Shot 8-200 l 280 8.0 Low 200+ Manufactured Cleaning, peening

Aluminum Oxide 12-325 u 125 9.0 Medium 6—8 Manufactured Cleaning, finishing, deburring, etching

Silicon Carbide 12-325 u 110 9.5 Medium 5—6 Manufactured Surface prep on extremely hard substrates

Glass Bead 10-400 l 85-90 5.5—6.0 Medium 8—10 Manufactured Cleaning, finishing

Plastic 12-80 u 45-60 3.0—4.0 Low/Medium 8—10 Manufactured Paint stripping, deflashing, cleaning

Bicarbonate of Soda 60-170 u 60 2.5 High 1 Manufactured Cleaning, paint removal

XL Corn Hybrid Polymer 16-60 u 45 3.0 Low 14—17 Manufactured Composite paint removal, adhesive deflash

Corn Cob 8-40 u 35-45 2.0—4.5 Medium 4—5 By-product Removing paint from delicate surfaces u = Angular | l = Spherical | *Consult OSHA regulations before using silica sand as a blasting abrasive.