scope:

This standard contains the requirements for the Thorough Spot and Sweep Blast Cleaning degree of visible surface cleanliness of previously coated steel surfaces by the use of dry abrasive blast cleaning. These requirements include the end condition of the surface as determined by visual inspection, and materials and procedures used to achieve and verify the end condition. Thorough spot and sweep blast cleaning is designed to subject the entire surface being prepared to abrasive impact. Coating that cannot withstand the abrasive blasting process is removed, while the remaining existing coating is suitably prepared for application of an additional layer of coating. Areas of exposed steel are prepared to the level of SSPC-SP 10/NACE No. 2.

This standard is limited to requirements for visible surface contaminants. Information on nonvisible contamination is in nonmandatory Appendix A1. Information on soluble salt testing is in SSPC-Guide 15.

Information about the function of Thorough Spot and Sweep Blast Cleaning is in Appendix A2. Appendix A3 contains existing coating considerations for project planners and managers.

Units of Measure:

This standard provides both IEEE/ASTM⁽¹⁾ SI 10 International System Units (SI) units and U.S. Customary units. SI Units are presented first, with a conversion into approximate U.S. custom units shown in parentheses. The conversions are not exact; therefore, each system must be used independently of the other.

⁽¹⁾ IEEE/ASTM SI 10, American National Standard for Metric Practice, ASTM International, West Conshohocken, PA, 2017,