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SSPC-SP 10
<br /> March 1, 1985
<br /> • Steel Structures Painting Council
<br /> SURFACE PREPARATION SPECIFICATION NO. 10
<br /> Near-White Blast Cleaning
<br /> 1, Scope 3.2 The cleanliness and size of recycled abrasives
<br /> 1.1 This specification covers the requirements for shall be maintained to insure compliance with this
<br /> Near-White Blast Cleaning of steel surfaces by the use of specification.
<br /> abrasives. 3.3 The blast cleaning abrasive shall be dry and free
<br /> of oil, grease, and other harmful materials at the time of
<br /> 2. Definition use.
<br /> 2.1 A Near-White Blast Cleaned surface, when viewed 3.4 Any limitations or restrictions on the use of
<br /> without magnification, shall be free of all visible oil, specific abrasives, quantity of contaminants, or degree of
<br /> grease, dirt, dust, mill scale, rust, paint, oxides, corrosion embedment shall be included in the procurement docu-
<br /> products, and other foreign matter, except for staining as ments (project specification) covering the work, since
<br /> noted in Section 2.2. abrasive embedment and abrasives containing con-
<br /> 2.2 Staining shall be limited to no more than 5 per- taminants may not be acceptable for some service re-
<br /> cent of each square inch of surface area and may consist quirements.
<br /> of light shadows, slight streaks, or minor discolorations 'NOTE: Additional information on abrasive selection is
<br /> caused by stains of rust, stains of mill scale, or stains of available in Section A.2 of the Appendix.
<br /> previously applied paint.
<br /> 2.3 ACCEPTABLE VARIATIONS IN APPEARANCE 4' Reference Standards
<br /> THAT DO NOT AFFECT SURFACE CLEANLINESS as 4.1 If there is a conflict between the cited reference
<br /> defined in Sections 2.1 and 2.2 include variations caused standards and this specification, this specification shall
<br /> by type of steel, original surface condition, thickness of prevail unless otherwise indicated in the procurement
<br /> the steel, weld metal, mill or fabrication marks, heat documents (project specification).
<br /> treating, heat affected zones, blasting abrasives, and dif- 4.2 The standards referenced in this specification
<br /> ferences in the blast pattern. are:
<br /> 2.4 When painting is specified, the surface shall be SSPC•SP 1 Solvent Cleaning
<br /> roughened to a degree suitable for the specified paint SSPC-Vis 1 Pictorial Surface Preparation Standards
<br /> system. for Painting Steel Surfaces
<br /> 2.5 Immediately prior to paint application,the surface g Procedure Before Blast Cleaning
<br /> shall comply with the degree of cleaning as specified
<br /> herein. 5.1 Before blast cleaning, visible deposits of oil or
<br /> grease shall be removed by any of the methods specified
<br /> 2.6 SSPC-Vis 1 or other visual standards of surface in SSPC-SP 1 or other agreed upon methods.
<br /> preparation may be specified to supplement the written
<br /> 5.2 Before blast cleaning,surface imperfections such
<br /> definition.
<br /> 'NOTE: Additional information on visual standards i3 as sharp fins, sharp edges, weld spatter, or burning slag
<br /> available in Section A.4 of the Appendix. should be removed from the surface to the extent required
<br /> by the procurement documents (project specification).
<br /> 3. Blast Cleaning Abrasives 'NOTE:Additional information on surface imperfections is
<br /> 3.1 The selection of abrasive size and type shall be available in Section A.5 of the Appendix.
<br /> based on the type, grade, and surface condition of the 6. Blast Cleaning Methods and Operation
<br /> steel to be cleaned, type of blast cleaning system
<br /> employed, the finished surface to be produced (cleanli-
<br /> ness and roughness), and whether the abrasive will be nozzle blasting. Moisture separators, oil separators, traps
<br /> recycled.
<br /> 'Notes are not requirements of this specification.
<br /> National Association of Corrosion Engineers
<br /> NiACEI Endorsement, October 31, 1984
<br /> 53
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