SSPC SP 5-2007 White Metal Blast Cleaning《白金属喷砂清理》.pdf

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1、SSPC-SP 5/NACE No. 1January 1, 20071SSPC: The Society for Protective CoatingsJoinT SurfaCe PreParaTion STandardSSPC-SP 5/naCe no. 1White Metal Blast CleaningThis The Society for Protective Coatings (SSPC)/NACE International (NACE) standard represents a consensus of those individual members who have

2、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, 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 prote

4、cting 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. Unpredict

5、able 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 thei

6、r 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 s

7、tandard 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 r

8、esponsible 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/N

9、ACE 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 us

10、er 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 +1 877/281-7772)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 in

12、tended 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 white metal blast cleaning. Near-white metal blast cleaning, commercial blast cleaning, industrial blast clean

13、ing, and brush-off blast cleaning are addressed in separate standards.White metal blast cleaning provides a greater degree of cleaning than near-white metal blast cleaning (SSPC-SP 10/NACE No. 21).The difference between a white metal blast and a near-white metal blast is that a white metal blast rem

14、oves all of the coating, mill scale, rust, oxides, corrosion products, and other foreign matter from the surface. Near-white metal blasting allows light shadows, slight streaks, or minor discolorations caused by stains of rust, stains of mill scale, or stains of previously applied coating to remain

15、on no more than 5 percent of each unit area of surface as defined in SSPC-SP 10/NACE No. 2.This joint standard was originally prepared in 1994 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 SS

16、PC 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 Preparation.SSPC-SP 5/NACE No. 1January 1, 20072In SSPC/

17、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 requirements f

18、or white metal blast cleaning of uncoated or coated steel surfaces by the use of abrasives. These requirements include the end condi-tion of the surface and materials and procedures necessary to achieve and verify the end condition.1.2 The mandatory requirements are described in Sections 1 to 9. Sec

19、tion 10, “Comments,” and Appendix A, “Explanatory Notes,” are not mandatory requirements of this standard.1.3 Information about the function of white metal blast cleaning is in Paragraph A1 of Appendix A. 1.4 Information about use of this standard in maintenance coating work is in Paragraph A2 of Ap

20、pendix A. Section 2: Definitions2.1 White Metal Blast Cleaned Surface: A 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 foreign matter.2.1.1 Acceptable variat

21、ions in appearance that do not affect surface cleanliness as defined in Paragraph 2.1 include variations caused by type of steel, original surface condition, thickness of the steel, weld metal, mill or fabrication marks, heat treating, heat-affected zones, blasting abrasives, and differences because

22、 of blasting technique. 2.1.2 SSPC-VIS 12may 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. Additional information on reference photographs and comparators is in Pa

23、ragraph A3 of Appendix A. Section 3: associated documents3.1 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 documen

24、ts listed in Paragraph 3.3 and this standard, the requirements of this standard shall prevail.3.3 Documents cited in the mandatory sections of this standard include:document TitleSSPC-AB 13Mineral and Slag AbrasivesSSPC-AB 24Cleanliness of Recycled Ferrous Metallic AbrasivesSSPC-AB 35Ferrous Metalli

25、c AbrasivesSSPC-SP 16Solvent CleaningSSPC-VIS 1 Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast CleaningSection 4: Procedures Before Cleaning 4.1 Before blast cleaning, visible deposits of oil, grease, or other contaminants shall be removed in accordance with SSPC-S

26、P 1 or other agreed-upon methods.4.2 Before blast cleaning, surface 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 imperfect

27、ions is in Paragraph A4 of Appendix A. 4.3 If reference photographs 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

28、is in Paragraph A3 of Appendix A.Section 5: Blast Cleaning Methods 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 pre

29、paration may be used to achieve a white metal blast cleaned surface:5.2.1 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 f

30、or 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 white metal blast cleaned surface by mutual agre

31、ement between SSPC-SP 5/NACE No. 1January 1, 20073those 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.Se

32、ction 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 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

33、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 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 S

34、SPC-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 included in the procurement documents (project specification) covering the work, because abrasive embedment and abrasives containing contaminants may not be ac

35、cept-able for some service requirements. 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

36、 thickness of coating applied over 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

37、upon by those parties responsible 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 e

38、stablishing the requirements and those 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 separator

39、s, oil separators, traps, or other 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 (pro

40、ject specification). Any damage to 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

41、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 blast cleaning shall be removed by recleaning the rusted areas before coating. Information on chemical contamination, rust-back (rerusting), and the effec

42、t of dew point (surface condensation) 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 shal

43、l be accessible to the inspector. 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 arbi

44、tration or settlement procedure 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) s

45、hould establish the responsibility 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 occup

46、ational 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.7The recommendations in Appendix A and SSPC-SP COM are be

47、lieved to represent good practice, but are not to be considered requirements of the standard. The sections of SSPC-SP COM that discuss subjects related to white metal blast cleaning are listed below.SSPC-SP 5/NACE No. 1January 1, 20074(1)ASTM International (ASTM), 100 Barr Harbor Drive, West Coshoho

48、cken, PA 19428-2959.Subject Commentary SectionAbrasive Selection.6Film Thickness 10Maintenance Repainting.4.2Reference Photographs 11Rust-Back (Rerusting) 4.5Surface Profile 6.2Weld Spatter 4.4.1Wet Abrasive Blast Cleaning 8.2references 1. SSPC-SP 10/NACE No. 2 (latest revision), “Near-White Metal B

49、last Cleaning” (Houston, TX: NACE, and Pittsburgh, PA: SSPC).2. SSPC-VIS 1 (latest revision), “Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning” (Pittsburgh, PA: SSPC).3. SSPC-AB 1 (latest revision), “Mineral and Slag Abrasives” (Pittsburgh, PA: SSPC).4. SSPC-AB 2 (latest revision), “Cleanliness of Recycled Ferrous Metallic Abrasives” (Pittsburgh, PA: SSPC).5. SSPC-AB 3 (latest revision), “Ferrous Metallic Abrasives” (Pittsburgh, PA: SSPC).6. SSPC-SP 1 (latest revision), “Solvent Cleaning” (Pitts-burgh, PA: SSPC).7. SSPC-SP COM (latest revision),