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SSPC-SP 10/NACE No. 2
<br />January 1, 2007
<br />group includes membersof both the SSPC Surface Preparation
<br />Committee and the NACE Unit Committee T-6G on Surtace
<br />Preparation. It was reaffirmed in 2006 by the SSPC Surface
<br />Preparation Committee and NACE Specific Technology
<br />Group (STG) 04, Protective Coatings and Linings: Surface
<br />Preparation.
<br />In SSPC/NACE standards, shall and must are used to
<br />state mandatory requirements. Should is used to state that
<br />which is considered good and is recommended but is not
<br />absolutely mandatory. May is used to state that which is
<br />considered optional.
<br />Section 1: General
<br />1.1 This joint standard covers the requirements for near-
<br />white metal blast cleaning of uncoated or coated steel surfaces
<br />by the use of abrasives. These requirements include the end
<br />condition of the surface and materials and procedures neces-
<br />sary to achieve and verify the end condition.
<br />1.2 The mandatory requirements are described in
<br />Sections 1 to 9. Section 10, "Comments," and Appendix A,
<br />"Explanatory Notes," are not mandatory requirements of this
<br />standard.
<br />1.3 Information about the function of near-white metal
<br />blast cleaning is in Paragraph A1 of Appendix A.
<br />1.4 Information about use of this standard in maintenance
<br />coating work is in Paragraph A2 of Appendix A.
<br />Section 2: Definitions
<br />2.1 Near-White Metal Blast Cleaned Surtace: A near-
<br />white metal blast cleaned surface, when viewed without
<br />magnification, shall be free of all visible oil, grease, dust, dirt,
<br />mill scale, rust, coating, oxides, corrosion products, and other
<br />foreign matter. Random staining shall be limited to no more
<br />than 5 percent of each unit area of surtace (approximately
<br />5,800 mmz [9.0 in.2] (i.e., a square 76 mm x 76 mm [3.0 in. x
<br />3.0 in.]), and may consist of light shadows, slight streaks, or
<br />minor discolorations caused by stains of rust, stains of mill
<br />scale, or stains of previously applied coating.
<br />2.1.1 Acceptable variations in appearance that do not
<br />affect surface cleanliness as defined in Paragraph 2.1 include
<br />variations caused bythe rype of steel, original surface condition,
<br />thickness of the steel, weld metal, mill or fabrication marks,
<br />heat treating, heat-affected zones, blasting abrasives, and
<br />differences because of blasting technique.
<br />2.1.2 SSPC-VIS 13 may be specified to supplement the
<br />written definition. In any dispute, the written definition set
<br />forth in this standard shall take precedence over reference
<br />photographs and comparators. Additional information on
<br />reference photographs and comparators is in Paragraph A3
<br />of Appendix A.
<br />Section 3: Associated Documents
<br />3.1 The latest issue, revision, or amendment of the docu-
<br />ments listed in Paragraph 3.3 in effect on the date of invitation
<br />to bid shail govern unless otherwise specified.
<br />3.2 If there is a conflict between the requirements of any
<br />of the documents listed in Paragraph 3.3 and this standard,
<br />the requirements of this standard shall prevail.
<br />3.3 Documents cited in the mandatory sections of this
<br />standard include:
<br />Document
<br />Title
<br />SSPC-AB 14
<br />Mineral and Slag Abrasives
<br />SSPC-AB 25
<br />Cleanliness of Recycled Ferrous
<br />Metallic Abrasives
<br />SSPC-AB 36
<br />Ferrous Metallic Abrasives
<br />SSPC-SP 1'
<br />Solvent Cleaning
<br />SSPC-VIS 1
<br />Guide and Reference Photographs
<br />for Steel Surfaces Prepared by Dry
<br />Abrasive Blast Cleaning
<br />Section 4: Procedures Before Cleaning
<br />4.1 Before blast cleaning, visible deposits of oil, grease,
<br />or other contaminants shall be removed in accordance with
<br />SSPC-SP 1 or other agreed-upon methods.
<br />4.2 Before blast cleaning, surface impertections such as
<br />sharp fins, sharp edges, weld spatter, or burning slag should
<br />be removed from the surface to the extent required by the
<br />procurement documents (project specification). Additional
<br />information on surface imperfections is in Paragraph A4 of
<br />Appendix A.
<br />4.3 If reference photographs or comparators are specified
<br />to supplement the written standard, the condition of the steel
<br />prior to blast cleaning should be determined before the blasting
<br />commences. Additional information on reference photographs
<br />and comparators is in Paragraph A3 of Appendix A.
<br />Section 5: Blast Cleaning Methods and
<br />Operation
<br />5.1 Clean, dry compressed air shall be used for nozzle
<br />blasting. Moisture separators, oil separators, traps, or other
<br />equipment may be necessary to achieve this requirement.
<br />5.2 Any of the following methods of surface preparation
<br />may be used to achieve a near-white metal blast cleaned
<br />surtace:
<br />2
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