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SSPC-SP 5
<br /> March 1, 1985
<br /> Steel Structures Painting Council
<br /> SURFACE PREPARATION SPECIFICATION NO. 5
<br /> White Metal Blast Cleaning
<br /> 1. Scope specific abrasives, quantity of contaminants, or degree of
<br /> 1.1 This specification covers the requirements for
<br /> embedment shall be included in the procurement docu-
<br /> ments (project specification) covering the work, since
<br /> White Metal Blast Cleaning of steel surfaces by the use of abrasive embedment and abrasives containing con•
<br /> abrasives. taminants may not be acceptable for some service re-
<br /> quirements.
<br /> 2. Definition *NOTE: Additional information on abrasive selection is
<br /> 2.1 A White Metal Blast Cleaned surface, when availabie in Section A.2 of the Appendix.
<br /> viewed without magnification, shall be free of all visible
<br /> oil, grease, dirt, dust, mill scale, rust, paint, oxides, cor- 4. Reference Standards
<br /> rosion products, and other foreign matter. 4,1 If there is a conflict petween the cited reference
<br /> 2.2 ACCEPTABLE VARIATIONS IN APPEARANCE standards and this specification, this specification shall
<br /> THAT DO NOT AFFECT SURFACE CLEANLINESS as prevail unless otherwise indicated in the procurement
<br /> defined in Section 2.1 include variations caused by type of documents (project specification),
<br /> steel, original surface condition, thickness of the steel, 4.2 The standards referenced in this specification
<br /> weld metal, mill or fabrication marks, heat treating, heat are:
<br /> affected zones, blasting abrasive, and differences in the SSPC-SP 1 Solvent Cleaning
<br /> blast pattern. SSPC-Vis 1 Pictorial Surface Preparation Standards
<br /> 2.3 When painting is specified, the surface shall be for Painting Steel Surfaces
<br /> roughened to a degree suitable for the specified paint
<br /> system. 5. Procedure Before Blast Cleaning
<br /> 2.4 Immediately prior to paint application the surface 5.1 Before blast cleaning, visible deposits of oil or
<br /> shall comply with the degree of cleaning as specified grease shall be removed by any of the methods specified
<br /> herein. in SSPC-SP 1 or other agreed upon methods.
<br /> 2.5 SSPC-Vis 1 or other visual standards of surface 5.2 Before blast cleaning,surface imperfections such
<br /> preparation may be specified to supplement the written .as sharp fins, sharp edges, weld spatter, or burning slag
<br /> definition. should be removed from the surface to the extent required
<br /> 'NOTE. Additional information on visual standards is by the procurement documents (project specification).
<br /> available in section A.4 of the Appendix. *NOTE:Additional information on surface imperfections is
<br /> available in Section A.5 of the Appendix.
<br /> 3. Blast Cleaning Abrasives
<br /> 3.1 The It selection of abrasive size and type shall be 6. Blast Cleaning Methods and Operation
<br /> based on the type, grade, and surface condition of the 6.1 Clean, dry, compressed air shall be used for
<br /> steel to be cleaned, type of blast cleaning system nozzle blasting. Moisture separators, oil separators, traps
<br /> employed, the finished surface to be produced (cleanli- or other equipment may be necessary to achieve this re-
<br /> ness and roughness), and whether the abrasive will be quirement.
<br /> recycled. 6.2 Any of the following methods of surface prepara-
<br /> 3.2 The cleanliness and size of recycled abrasives tion may be used to achieve a White Metal Blast Cleaned
<br /> shall be maintained to insure compliance with this surface:
<br /> specification. 6.2.1 Dry abrasive blasting using compressed air,
<br /> 3.3 The blast cleaning,abrasive shall be dry and free blast nozzles, and abrasive.
<br /> of oil, grease, and other harmful materials at the time of 6.2.2 Dry abrasive blasting using a closed cycle,recir-
<br /> use• culating abrasive system with compressed air, blast noz
<br /> .1
<br /> 3.4 ny limitations or restrictions on the use of zle, and abrasive, with or without vacuum for dust and.
<br /> 'Notes are not requirements of this specification.
<br /> National Association of Corrosion Engineers
<br /> IVACI� Endorsement, October 31, 1984
<br /> 39
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