Steel Advice - The Fabricator's Resource
SSPC-SP 1 - Solvent Cleaning
Removal of oil, grease, dirt, soil, salts, and contaminants by cleaning with solvent, vapor, alkali, emulsion or steam.
SSPC-SP 2 - Hand Tool Cleaning
Removal of loose rust, loose mill scale, and loose paint to degree specified, by hand chipping, descaling, sanding, scraping and wire brushing.
SSPC-SP 3 - Power Tool Cleaning
Removal of loose rust, loose mill scale, and loose paint to degree specified, by power tool shipping, descaling, sanding, wire brushing and grinding.
SSPC-SP 4 - Flame Cleaning of New Steel
Dehydrating and removal of rust, loose mill scale, and some tight mill scale by use of flame, followed by wire brushing.
SSPC-SP 5 - White Metal Blast Cleaning
Removal of all visible rust, mill scale, paint and foreign matter by blast cleaning by wheel or nozzle (dry or wet) using sand, grit or shot. (for very corrosive atmosphere where high cost of cleaning is warranted)
SSPC-SP 6 - Commercial Blast Cleaning
Blast Cleaning until at least two-thirds of each element of surface area is free of all visible residue. (for rather severe conditions of exposure)
SSPC-SP 7 - Brush off blast cleaning
Blast cleaning of all except tightly adhering residues of mill scale, rust and coating, exposing numerous evenly distributed flecks of underyling metal.
SSPC-SP 10 - Near White Blast Cleaning
Blast Cleaning to white metal cleanliness, until at least 99% of each element of surface area is free of all visible residues. (for high humidity, chemical atmosphere, a marine or other corrosive environment conditions)
Theoretical paint coverage for steel has some standard rules to follow.
A gallon of coatings, having 100% solids, always contains 1604 mil feet. Obtain solids content, by volume from the manufacturer.
Multiply the mil feet per gallon by the solids content by volume.
Example: A coating having 47% solids by volume has 754 mil feet per gallon (1604 x 0.47 = 754)
Convert mil feet per gallon to theoretical coverage.
Divide the mil feet per gallon by the mil thickness per coat.
Example: 754 mil feet per gallon divided by 2 mils per coat = 377 sq. ft.
Paint loss needs to be factored for unusable paint that coats the inside of the container and equipment. Paint will also be lost in overspray from the coating activity.
Deduct loss factor for unpitted plate steel at 10%, structural steel at 20%.
Calculating Coating Coverage
Know your Cleaning Specifications!
The Painter's Bucket
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