1、SSPC-SP 6/NACE No. 3January 1, 20071SSPC: The Society for Protective CoatingsJoinT SurfaCe PreParaTion STandardSSPC-SP 6/naCe no. 3Commercial Blast CleaningThis The Society for Protective Coatings (SSPC)/NACE International (NACE) standard represents a consensus of those individual members who have r
2、eviewed this document, its scope, and provisions. It is intended to aid the manufacturer, the consumer, and the general public. Its acceptance does not in any respect preclude anyone, whether he has adopted the standard or not, from manufacturing, marketing, purchasing, or using products, processes,
3、 or procedures not addressed in this standard. Nothing contained in this SSPC/NACE standard is to be construed as granting any right, by implication or otherwise, to manufacture, sell, or use in connection with any method, apparatus, or product covered by Letters Patent, or as indemnifying or protec
4、ting anyone against liability for infringement of Letters Patent. This standard represents current technology and should in no way be interpreted as a restriction on the use of better procedures or materials. Neither is this standard intended to apply in all cases relating to the subject. Unpredicta
5、ble circumstances may negate the usefulness of this standard in specific instances. SSPC and NACE assume no responsibility for the interpretation or use of this standard by other parties and accept responsibility for only those official interpretations issued by SSPC or NACE in accordance with their
6、 governing procedures and policies which preclude the issuance of interpretations by individual volunteers.Users of this SSPC/NACE standard are responsible for reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this st
7、andard prior to its use. This SSPC/NACE standard may not necessarily address all potential health and safety problems or environmental hazards associated with the use of materials, equipment, and/or operations detailed or referred to within this standard. Users of this SSPC/NACE standard are also re
8、sponsible for establishing appropriate health, safety, and environmental protection practices, in consultation with appropriate regulatory authorities if necessary, to achieve compliance with any existing applicable regulatory requirements prior to the use of this standard.CauTionarY noTiCe: SSPC/NA
9、CE standards are subject to periodic review, and may be revised or withdrawn at any time in accordance with technical committee procedures. SSPC and NACE require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of initial publication. The use
10、r is cautioned to obtain the latest edition. Purchasers may receive current informa-tion on all standards and other publications by contacting the organizations at the addresses below:SSPC: The Society for Protective Coatings40 24th Street, Sixth FloorPittsburgh, PA 15222(telephone +1 877/281-7772)N
11、ACE International 1440 South Creek Houston, TX 77084-4906 (telephone +1 281/228-6200) forewordThis joint standard covers the use of blast cleaning abrasives to achieve a defined degree of cleaning of steel surfaces prior to the application of a protective coating or lining system. This standard is i
12、ntended for use by coating or lining specifiers, applicators, inspectors, or others who may be responsible for defining a standard degree of surface cleanliness.The focus of this standard is commercial blast cleaning. White metal blast cleaning, near-white metal blast cleaning, industrial blast clea
13、ning, and brush-off blast cleaning are addressed in separate standards.Commercial blast cleaning provides a greater degree of cleaning than industrial blast cleaning (SSPC-SP 14/NACE No. 81) but less than near-white metal blast cleaning (SSPC-SP 10/NACE No. 22).Commercial blast cleaning is used when
14、 the objective is to remove all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter, leaving staining or shadows on no more than 33 percent of each unit area of surface. The difference between a commercial blast cleaning and a near-white m
15、etal blast cleaning is in the amount of staining permitted to remain on the surface. Commercial blast cleaning allows stains or shadows on 33 percent of each unit area of surface. Near-white metal blast cleaning allows staining or shadows on only 5 percent of each unit area of surface. The differenc
16、e between a commercial blast cleaning and an industrial blast cleaning is that a commercial blast cleaning removes all visible oil, grease, dust, dirt, mill scale, rust, coating, SSPC-SP 6/NACE No. 3January 1, 20072oxides, corrosion products, and other foreign matter from all surfaces and allows sta
17、ins to remain on 33 percent of each unit area of surface, while industrial blast cleaning allows defined mill scale, coating, and rust to remain on less than 10 percent of each unit area of surface and allows defined stains to remain on all surfaces. This joint standard was originally prepared in 19
18、94 and reaffirmed in 2000 by the SSPC/NACE Task Group A on Surface Preparation by Abrasive Blast Cleaning. This joint task group includes members of both the SSPC Surface Preparation Committee and the NACE Unit Committee T-6G on Surface Preparation. It was reaffirmed in 2006 by the SSPC Surface Prep
19、aration Committee and NACE Specific Technology Group (STG) 04, Protective Coatings and Linings: Surface Preparation.In SSPC/NACE standards, shall and must are used to state mandatory requirements. Should is used to state that which is considered good and is recommended but is not absolutely mandator
20、y. May is used to state that which is considered optional.Section 1: General1.1 This joint standard covers the requirements for commercial blast cleaning of uncoated or coated steel surfaces by the use of abrasives. These requirements include the end condition of the surface and materials and proced
21、ures neces-sary to achieve and verify the end condition.1.2 The mandatory requirements are described in Sections 1 to 9. Section 10, “Comments,” and Appendix A, “Explanatory Notes,” are not mandatory requirements of this standard.1.3 Information about the function of commercial blast cleaning is in
22、Paragraph A1 of Appendix A. 1.4 Information about use of this standard in maintenance coating work is in Paragraph A2 of Appendix A.Section 2: Definitions2.1 Commercial Blast Cleaned Surface: A commercial blast cleaned surface, when viewed without magnification, shall be free of all visible oil, gre
23、ase, dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter. Random staining shall be limited to no more than 33 percent of each unit area of surface (approximately 5,800 mm29.0 in.2) (i.e., a square 76 mm x 76 mm 3.0 in. x 3.0 in.) and may consist of light shado
24、ws, slight streaks, or minor discolorations caused by stains of rust, stains of mill scale, or stains of previously applied coating.2.1.1 Acceptable variations in appearance that do not affect surface cleanliness as defined in Paragraph 2.1 include variations caused by type of steel, original surfac
25、e condition, thickness of the steel, weld metal, mill or fabrication marks, heat treating, heat-affected zones, blasting abrasives, and differences because of blasting technique. 2.1.2 SSPC-VIS 13may be specified to supplement the written definition. In any dispute, the written definition set forth
26、in this standard shall take precedence over reference photographs and comparators. Additional information on reference photographs and comparators is in Paragraph A3 of Appendix A. Section 3: associated documents3.1 The latest issue, revision, or amendment of the docu-ments listed in Paragraph 3.3 i
27、n effect on the date of invitation to bid shall govern unless otherwise specified.3.2 If there is a conflict between the requirements of any of the documents listed in Paragraph 3.3 and this standard, the requirements of this standard shall prevail.3.3 Documents cited in the mandatory sections of th
28、is standard include:document TitleSSPC-AB 14Mineral and Slag AbrasivesSSPC-AB 25Cleanliness of Recycled Ferrous Metallic AbrasivesSSPC-AB 36Ferrous Metallic AbrasivesSSPC-SP 17Solvent CleaningSSPC-VIS 1 Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast CleaningSection
29、 4: Procedures Before Cleaning4.1 Before blast cleaning, visible deposits of oil, grease, or other contaminants shall be removed in accordance with SSPC-SP 1 or other agreed-upon methods.4.2 Before blast cleaning, surface imperfections such as sharp fins, sharp edges, weld spatter, or burning slag s
30、hould be removed from the surface to the extent required by the procurement documents (project specification). Additional information on surface imperfections is in Paragraph A4 of Appendix A. 4.3 If reference photographs or comparators are specified to supplement the written standard, the condition
31、 of the steel prior to blast cleaning should be determined before the blasting commences. Additional information on reference photographs and comparators is in Paragraph A3 of Appendix A.SSPC-SP 6/NACE No. 3January 1, 20073Section 5: Blast Cleaning Methods andoperation5.1 Clean, dry compressed air s
32、hall be used for nozzle blasting. Moisture separators, oil separators, traps, or other equipment may be necessary to achieve this requirement.5.2 Any of the following methods of surface prepara-tion may be used to achieve a commercial blast cleaned surface:5.2.1 Dry abrasive blasting using compresse
33、d air, blast nozzles, and abrasive.5.2.2 Dry abrasive blasting using a closed-cycle, recir-culating abrasive system with compressed air, blast nozzle, and abrasive, with or without vacuum for dust and abrasive recovery.5.2.3 Dry abrasive blasting using a closed-cycle, recircu-lating abrasive system
34、with centrifugal wheels and abrasive.5.3 Other methods of surface preparation (such as wet abrasive blast cleaning) may be used to achieve a commer-cial blast cleaned surface by mutual agreement between those responsible for establishing the requirements and those responsible for performing the work
35、. Information on the use of inhibitors to prevent the formation of rust immediately after wet abrasive blast cleaning is in Paragraph A5 of Appendix A.Section 6: Blast Cleaning abrasives6.1 The selection of abrasive size and type shall be based on the type, grade, and surface condition of the steel
36、to be cleaned, the type of blast cleaning system used, the finished surface to be produced (cleanliness and surface profile rough-ness), and whether the abrasive will be recycled.6.2 The cleanliness and size of recycled abrasives shall be maintained to ensure compliance with this standard.6.3 The bl
37、ast cleaning abrasive shall be dry and free of oil, grease, and other contaminants as determined by the test methods found in SSPC-AB 1, SSPC-AB 2, and SSPC-AB 3. 6.4 Any limitations on the use of specific abrasives, the quantity of contaminants, or the degree of allowable embed-ment shall be includ
38、ed in the procurement documents (project specification) covering the work, because abrasive embedment and abrasives containing contaminants may not be accept-able for some service requirements. Additional information on abrasive selection is in Paragraph A6 of Appendix A.6.5 When a coating is specif
39、ied, the cleaned surface shall be roughened to a degree suitable for the specified coating system. Additional information on surface profile and the film thickness of coating applied over the surface profile is in Paragraphs A7 and A8 of Appendix A.Section 7: Procedures following Blast Cleaning and
40、immediately Prior To Coating7.1 Visible deposits of oil, grease, or other contaminants shall be removed according to SSPC-SP 1 or another method agreed upon by those parties responsible for establishing the requirements and those responsible for performing the work.7.2 Dust and loose residues shall
41、be removed from prepared surfaces by brushing; blowing off with clean, dry air; vacuum cleaning; or other methods agreed upon by those responsible for establishing the requirements and those responsible for performing the work.7.2.1 The presence of toxic metals in the abrasives or coating being remo
42、ved may place restrictions on the methods of cleaning permitted. The chosen method shall comply with all applicable regulations.7.2.2 Moisture separators, oil separators, traps, or other equipment may be necessary to achieve clean, dry air.7.3 After blast cleaning, any remaining surface imperfec-tio
43、ns (e.g., sharp fins, sharp edges, weld spatter, burning slag, scabs, slivers) shall be removed to the extent required by the procurement documents (project specification). Any damage to the surface profile resulting from the removal of surface imperfections shall be corrected to meet the requiremen
44、ts of Paragraph 6.5. Additional information on surface imperfections is in Paragraph A4 of Appendix A.7.4 Immediately prior to coating application, the entire surface shall comply with the degree of cleaning specified in this standard. Any visible rust that forms on the surface of the steel after bl
45、ast cleaning shall be removed by recleaning the rusted areas before coating. Information on chemical contamination, rust-back (rerusting), and the effect of dew point (surface condensation) is in Paragraphs A9, A10, and A11 of Appendix A.Section 8: inspection8.1 Work performed and materials supplied
46、 under this standard are subject to inspection by a representative of those responsible for establishing the requirements. Materials and work areas shall be accessible to the inspector. The proce-dures and times of inspection shall be as agreed upon by those responsible for establishing the requirem
47、ents and those responsible for performing the work.8.2 Conditions not complying with this standard shall be corrected. In the case of a dispute, an arbitration or settlement SSPC-SP 6/NACE No. 3January 1, 20074(1)ASTM International (ASTM), 100 Barr Harbor Drive, West Coshohocken, PA 19428-2959.proce
48、dure established in the procurement documents (project specification) shall be followed. If no arbitration or settlement procedure is established, a procedure mutually agreeable to purchaser and supplier shall be used.8.3 The procurement documents (project specification) should establish the respons
49、ibility for inspection and for any required affidavit certifying compliance with the specification.Section 9: Safety and environmental requirements9.1 Because abrasive blast cleaning is a hazardous opera-tion, all work shall be conducted in compliance with applicable occupational and environmental health and safety rules and regulations. Section 10: Comments (nonmandatory)10.1 Additional information and data relative to this standard are in Appendix A. Detailed information and data are presented in SSPC-SP COM.8The recommendations in Appendix A and SSPC-SP COM are believed to represent
