SSPC SP 10-2007 Near-White Metal Blast Cleaning《近白色金属的喷砂清理》.pdf

1、SSPC-SP 10/NACE No. 2January 1, 20071SSPC: The Society for Protective CoatingsJoinT SurfaCe PreParaTion STandardSSPC-SP 10/naCe no. 2near-White Metal Blast CleaningThis The Society for Protective Coatings (SSPC)/NACE International (NACE) standard represents a consensus of those individual members wh

2、o have reviewed 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, pr

3、ocesses, 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 o

4、r protecting 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. Un

5、predictable 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 wi

6、th their 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

7、 this standard 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

8、 also responsible 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:

9、 SSPC/NACE 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.

10、The user is cautioned to obtain the latest edition. Purchasers may receive current information 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-

11、7772)NACE 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

12、 is intended 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 near-white metal blast cleaning. White metal blast cleaning, commercial blast cleaning, industrial blast

13、 cleaning, and brush-off blast cleaning are addressed in separate standards.Near-white metal blast cleaning provides a greater degree of cleaning than commercial blast cleaning (SSPC-SP 6/NACE No. 31) but less than white metal blast cleaning (SSPC-SP 5/NACE No. 12).Near-white metal blast cleaning is

14、 used when the objective is to remove all rust, coating, and mill scale, but when the extra effort required to remove all stains of these materials is determined to be unwarranted. Staining shall be limited to no more than 5 percent of each unit area of surface. Near-white metal blast cleaning allow

15、s staining on only 5 percent of each unit area of surface, while commercial blast cleaning allows staining on 33 percent of each unit area of surface. White metal blast cleaning does not permit any staining to remain on the surface.This joint standard was originally prepared in 1994 and reaffirmed i

16、n 2000 by the SSPC/NACE Task Group A on Surface Preparation by Abrasive Blast Cleaning, and NACE Unit Committee T-6G on Surface Preparation. This joint task SSPC-SP 10/NACE No. 2January 1, 20072reference photographs and comparators is in Paragraph A3 of Appendix A. Section 3: associated documents3.1

17、 The latest issue, revision, or amendment of the docu-ments listed in Paragraph 3.3 in 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 requiremen

18、ts of this standard shall prevail.3.3 Documents cited in the mandatory sections of this 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 Re

19、ference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast CleaningSection 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, s

20、urface imperfections such as sharp fins, sharp edges, weld spatter, or burning slag should 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 photo

21、graphs or comparators are specified to supplement the written standard, the condition 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.Section 5: Blast Cleaning Me

22、thods and operation5.1 Clean, dry compressed air shall 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 preparation may be used to achieve a near-white metal blast clea

23、ned surface: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 Preparation Committee and NACE Specific Technology Group (STG) 04, Protective Coatings and Linings: Surface Prepara

24、tion. 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 mandatory. May is used to state that which is considered optional.Section 1: General1.1 This joint standard covers the

25、 requirements for near-white metal 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 procedures neces-sary to achieve and verify the end condition.1.2 The mandatory requirements are described in

26、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 near-white metal blast cleaning is in Paragraph A1 of Appendix A. 1.4 Information about use of this standard in maintenance coating work

27、 is in Paragraph A2 of Appendix A. Section 2: Definitions2.1 near-White Metal Blast Cleaned Surface: A near-white metal blast cleaned surface, when viewed without magnification, shall be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other for

28、eign matter. Random staining shall be limited to no more than 5 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 shadows, slight streaks, or minor discolorations caused by stains of rust, stains of mill s

29、cale, 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 the type of steel, original surface condition, thickness of the steel, weld metal, mill or fabrication marks, heat

30、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 in this standard shall take precedence over reference photographs and comparators

31、. Additional information on SSPC-SP 10/NACE No. 2January 1, 200735.2.1 Dry abrasive blasting using compressed 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

32、dust and abrasive recovery.5.2.3 Dry abrasive blasting using a closed-cycle, recircu-lating abrasive system with centrifugal wheels and abrasive.5.3 Other methods of surface preparation (such as wet abrasive blast cleaning) may be used to achieve a near-white metal blast cleaned surface by mutual ag

33、reement between those responsible for establishing the requirements and those responsible for performing the work. 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

34、.1 The selection of abrasive size and type shall be based on the type, grade, and surface condition of the steel 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

35、cleanliness and size of recycled abrasives shall be maintained to ensure compliance with this standard.6.3 The blast 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 t

36、he use of specific abrasives, the quantity of contaminants, or the degree of allowable embed-ment shall be included in the procurement documents (project specification) covering the work, because abrasive embedment and abrasives containing contaminants may not be accept-able for some service require

37、ments. Additional information on abrasive selection is in Paragraph A6 of Appendix A.6.5 When a coating is specified, 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

38、 the surface profile is in Paragraphs A7 and A8 of Appendix A. Section 7: Procedures following Blast Cleaning and 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

39、for establishing the requirements and those responsible for performing the work.7.2 Dust and loose residues shall 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 t

40、hose responsible for performing the work.7.2.1 The presence of toxic metals in the abrasives or coating being removed 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

41、 equipment may be necessary to achieve clean, dry air.7.3 After blast cleaning, any remaining surface imperfec-tions (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

42、 the surface profile resulting from the removal of surface imperfections shall be corrected to meet the requirements 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 t

43、he degree of cleaning specified in this standard. Any visible rust that forms on the surface of the steel after blast 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 condensati

44、on) is in Paragraphs A9, A10, and A11 of Appendix A.Section 8: inspection8.1 Work performed and materials supplied 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.

45、The proce-dures and times of inspection shall be as agreed upon by those responsible for establishing the requirements 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 procedure es

46、tablished 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 responsibility

47、 for inspection and for any required affidavit certifying compliance with the specification.SSPC-SP 10/NACE No. 2January 1, 200748. SSPC-SP COM (latest revision), “Surface Preparation Commentary for Steel and Concrete Substrates” (Pittsburgh, PA: SSPC).9. SSPC-PA Guide 4 (latest revision), “Guide to

48、 Maintenance Repainting with Oil Base or Alkyd Painting Systems” (Pittsburgh, PA: SSPC).10. NACE Standard SP0178 (formerly RP0178-2003) (latest revision), “Fabrication Details, Surface Finish Requirements, and Proper Design Considerations for Tanks and Vessels to Be Lined for Immersion Service” (Hou

49、ston, TX: NACE).11. NACE Standard RP0287 (latest revision), “Field Measure-ment of Surface Profile of Abrasive Blast-Cleaned Steel Surfaces Using a Replica Tape” (Houston, TX: NACE).12. ASTM(1)D 4417 (latest revision), “Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel” (West Conshohocken, PA: ASTM).13. SSPC-PA 2 (latest revision), “Measurement of Dry Coating Thickness with Magnetic Gages” (Pittsburgh, PA: SSPC).14. SSPC-SP 12/NACE No. 5 (latest revision), “Surface Prepa-ration and Cleaning of Metals by Waterjetting Prior to Recoating” (Pittsburgh, P