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1. Dry abrasive blasting using compressed air blast nozzles and dry blast <br />media of a maximum particle size no larger than that passing through a 16 <br />mesh screen, U. S. sieve series. <br />2. Wet or water vapor abrasive blasting using compressed air blast nozzles, <br />water and blast media of a maximum particle size no larger than that <br />passing through a 16 mesh screen, U. S. sieve series. <br />3. Grit blasting using compressed air blast nozzles and crushed grit made of <br />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, <br />U. S. sieve series. The largest commercial grade of inetal grit permitted by <br />this specification is SAE No. G-25 abrasive material. <br />4. Shot blasting using compressed air nozzles and cast iron, steel, or <br />synthetic grits shot of a maximum size no larger than that passing through <br />a 16 mesh screen, U. S. sieve series. The largest commercial grade of inetal <br />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 abrasive. <br />6. Grit blasting using centrifugal wheels and crushed grit made of cast iron, <br />malleable iron, steel, or synthetic grits other than sand, of a maximum <br />particle size no larger than that passing through a 16 mesh screen, U. S. <br />sieve series. The largest commercial grade of inetal grit permitted by this <br />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 grit <br />permitted by this specification is SAE No. S-330. <br />The surface, if wet sandblasted, shall be cleaned by rinsing with fresh water to which <br />sufficient corrosion inhibitor has been added to prevent rusting, or with fresh water <br />followed immediately by an inhibitive treatment. This cleaning shall be supplemented <br />by brushing, if necessary, to remove any residue. <br />The compressed air used for nozzle blasting shall be free of detrimental amounts of <br />condensed water or oil. Adequate separators and traps shall be provided. <br />TS2-2 <br />. 446 <br />