Visuals and Definitions. NACE, SSPC, SIS Standards of Surface Finish. Brush Off, Commercial, Near White, White Metal Blast.
Are you competitive?
Are you efficient?
Here are 10 Essential Components to Succeed in Today’s Economy.Use the arrows at the bottom of the page or jump directly to the section you would like to see with the links below.
Compressed Air
Air Supply Hose
Moisture
Blast Machine
Blast Hose
Blast Nozzle
Abrasive
Operator Comfort and Safety
Blaster Technique
Supervision and Communication
Pursuing the Details yields Competitiveness & Efficiency
In today's business environment, if you're standing still, you’re moving backwards!
#1 - Compressed Air
FACT: 100 psig does twice the work of 60 psigPressure + Volume = Cost EffectiveDoes your compressor maintain pressure?How much air does it TRULY produce?
#2 - Air Supply Hose
FACT: Hose ¼” undersized can restrict pressure by 30%
Large Blast Hose + Small Nozzle = Loss of ProductionSmall Blast Hose + Large Nozzle = Loss of ProductionLong Runs of Blast Hose = Loss in Pressure & Production
Fact: The Skill of the Blaster WILL ‘make’ or ‘break’ a Job
Consistent movement of the nozzleMonitor abrasive flowDouble blast welds and imperfectionsBlast to required Degree of Surface CleanlinessSee blast cleanliness presentation on the left of the page.
Communicate Expectations & Observe Periodically with Inspection Tools-Blast pressure at nozzle-Nozzle orifice wear-Moisture content-Abrasive Quality-Equipment operation-Operator Technique-Operator safety equipment-Operator comfort
Degrees of Cleanliness of Blast-Cleaned Surfaces
4 Degrees of Cleanliness• Brush Off Blast• Commercial Blast• Near White Blast• White Metal Blast
NACE – National Association of Corrosion EngineersSSPC – Steel Structures Painting CouncilSIS – Swedish Standards Institute
Condition of Steel
Grade AGrade BGrade C
Grade A – Steel where mill scale has started to flake and light rusting occursGrade B – Steel where all mill scale has flaked off and complete rusting has taken placeGrade C – Steel where pitting and complete rusting has occurred
Brush Off Blast
Grade AGrade BGrade CNACE – 4 SSPC-SP-7 SA - 1
Definition: A Brush-Off Blast Cleaned Surface Finish is defined as one from which all oil, grease, dirt, rust scale, loose mill scale, loose rust and loose paint or coatings are removed completely but tight mill scale and tightly adhered rust, paint and coatings are permitted to remain provided that all mill scale and rust have been exposed to the abrasive blast pattern sufficiently to expose numerous flecks of the underlying metal fairly uniformly distributed over the entire surface.
Commercial Blast
Grade AGrade BGrade CNACE – 4 SSPC-SP-7 SA - 2
Definition: A Commercial Blast Cleaned Surface Finish is defined as one from which all oil, grease, dirt, rust scale and foreign matter have been completely removed from the surface and all rust, mill scale and old paint have been completely removed except for slight shadows, streaks, or discolorations caused by rust stain, mill scale oxides or slight, tight residues of paint or coating that may remain; if the surface is pitted, slight residues of rust or paint may by found in the bottom of pits; at least two-thirds of each square inch of surface area shall be free of all visible residues and the remainder shall be limited to the light discoloration, slight staining or tight residues mentioned above.
Near White Metal Blast
Grade AGrade BGrade CNACE -2 SSPC-SP-10 SA – 2 ½
Definition: A Near-White Blast Cleaned Surface Finish is defined as one from which all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint or other foreign matter have been completely removed from the surface except for very light shadows, very slight streaks or slight discolorations caused by rust stain, mill scale oxides, or light, tight residues of paint or coating that may remain. At least 95 percent of each square inch of surface area shall be free of all visible residues, and the remainder shall be limited to the light discoloration mentioned above.
White Metal Blast
Grade AGrade BGrade CNACE – 1 SSPC-SP-5 SA - 3
Definition: A White Metal Blast Cleaned Surface Finish is defined as a surface with a gray-white, uniform metallic color, slightly roughened to form a suitable anchor pattern for coatings. The surface, when viewed without magnification, shall be free of all oil, grease, dirt, visible mill scale, rust, corrosion products, oxides, paint, or any other foreign matter.