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B. Excessive rust-scale may be removed by impact tools, as outlined in <br />Specification SSPC-SP 2-82, "Hand Tool Cleaning", or SSPC-SP 3-82, "Power <br />Tool Cleaning", or by special blasting equipment. <br />C. The surface of the metal shall be blast cleaned to a near-white finish by any <br />of the following methods: <br />1. Dry sandblasting using compressed air blast nozzles and dry sand of a <br />maximum particle size no larger than that passing through a 16 mesh <br />screen, U. S. Sieve series. <br />2. Wet or water vapor sandblasting using compressed air blast nozzles, <br />water and sand of a maximum particle size no larger than that passing <br />through a 16 mesh screen, U. S. sieve series. <br />3. Grit blasting using compressed air blast nozzles and crushed grit made <br />of cast iron, , malleable iron, steel, or synthetic grits other than sand, of a <br />maximum particle size no larger than that passing through a 16 mesh <br />screen, U. S. sieve series. The largest commercial grade of inetal grit <br />permitted by this specification is SAE No. G-25 abrasive material. <br />4. Shot blasting using compressed air nozzles and cast iron, malleable iron, <br />steel, or synthetic shot of a maximum size no larger than that passing <br />through a 16 mesh screen, U. S. sieve series. The largest commercial <br />grade of inetal grit permitted by this specification is SAE No. S-330. <br />5. Closed, recirculating nozzle blasting using compressed air, vacuum, and <br />any of the preceding abrasives. <br />6. Grit blasting using centrifugal wheels and crushed grit made of cast <br />iron, malleable iron, steel, or synthetic grits other than sand, of a <br />maximum particle size no larger than that passing through a 16 mesh <br />screen, U. S. sieve series. The largest commercial grade of inetal grit <br />permitted by this specification is SAE No. G-25. <br />7. Shot blasting using centrifugal wheels and cast iron, steel, or synthetic <br />grits shot of a maximum size no larger than that passing through a 16 <br />mesh screen, U. S. sieve series. The largest commercial grade of inetal <br />grit permitted by this specification is SAE No. 5-330. <br />The surface, if dry blasted, shall be brushed with clean brushes made of hair, bristle, or <br />fiber, or blown off with compressed air (From which detrimental oil and water have <br />been removed), or cleaned by vacuum, for the purpose of removing any traces of blast <br />TS3-2 <br />450 <br />