SSPC SP 14-2007 Industrial Blast Cleaning《工业喷砂清理》.pdf

1、SSPC-SP 14/NACE No. 8January 1, 20071SSPC: The Society for Protective CoatingsJoinT SurfaCe PreParaTion STandardSSPC-SP 14/naCe no. 8industrial 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, processe

3、s, 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 prot

4、ecting 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. Unpredic

5、table 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 the

6、ir 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

7、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 also

8、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: SSPC/

9、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. The u

10、ser 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)

11、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 is

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

13、aning, and brush-off blast cleaning are addressed in separate standards.Industrial blast cleaning provides a greater degree of cleaning than brush-off blast cleaning (SSPC-SP 7/NACE No. 41) but less than commercial blast cleaning (SSPC-SP 6/NACE No. 32).Industrial blast cleaning is used when the obj

14、ective is to remove most of the coating, mill scale, and rust, while the extra effort required to remove every trace of these is determined to be unwarranted. The difference between an industrial blast cleaning and a brush-off blast cleaning is that the objective of a brush-off blast cleaning is to

15、allow as much of an existing adherent coating to remain as possible, while the purpose of the industrial blast cleaning is to remove most of the existing coating. A commercial blast cleaned surface is free of mill scale, rust, and coatings, and allows only random staining on less than 33 percent of

16、each unit area of surface. The industrial blast cleaned surface 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. SSPC-SP 14/NACE No. 8January 1, 20072However, all surfaces in limited-acces

17、s areas shall be subjected to the abrasive blast, and on completion, old coating, rust, and mill scale are permitted to remain provided they are well-adherent as determined using a dull putty knife. 2.1.2 Acceptable variations in appearance that do not affect surface cleanliness as defined in Paragr

18、aph 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 of blasting technique. 2.1.3 SSPC-VIS 13, ISO(1)8501-14(Condition B Sa 2), or

19、 other reference photographs or comparators may be used to supplement the written definition. Condition B Sa 2 of ISO 8501-1 does not depict the influence that previously applied coating may have on the appearance of the cleaned surface. It is based on cleaning of a previously uncoated steel surface

20、 covered with rust and flaking mill scale. 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 in effect on the date of invitation to bi

21、d 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 this standard include:document TitleSSPC-A

22、B 15Mineral and Slag AbrasivesSSPC-AB 26Cleanliness of Recycled Ferrous Metallic AbrasivesSSPC-AB 37Ferrous Metallic AbrasivesSSPC-SP 18Solvent CleaningSSPC-VIS 1 Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast CleaningISO 8501-1 Preparation of steel substrates befo

23、re application of paints and related products - Visual assess-ment of surface cleanliness Section 4: Procedures Before Blast 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.This joint

24、 standard was originally prepared in 1998 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 S

25、SPC Surface Preparation 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 a

26、bsolutely mandatory. May is used to state that which is considered optional.Section 1: General1.1 This joint standard covers the requirements for industrial blast cleaning of uncoated or coated steel surfaces by the use of abrasives. These requirements include the end condition of the surface and ma

27、terials and procedures 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 industrial bla

28、st 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 Appendix A. Section 2: Definitions2.1 industrial Blast Cleaned Surface: An industrial blast cleaned surface, when viewed without magnification, shall be free of a

29、ll visible oil, grease, dust, and dirt. Traces of tightly adherent mill scale, rust, and coating residues are permitted to remain on 10 percent of each unit area of the surface (approximately 5,800 mm29.0 in.2) (i.e., a square 76 mm x 76 mm 3.0 in. x 3.0 in.) if they are evenly distributed. The trac

30、es of mill scale, rust, and coating are considered to be tightly adherent if they cannot be lifted with a dull putty knife. Shadows, streaks, and discolorations caused by stains of rust, stains of mill scale, and stains of previously applied coating may be present on the remainder of the surface. 2.

31、1.1 The shape, configuration, and design of structures can lead to areas of limited accessibility for blast cleaning. Examples include crevices around rivets or fasteners, and behind or between tightly configured back-to-back angles. Because of the limited accessibility, these areas are exempt from

32、the 10 percent restrictions established in Paragraph 2.1. (1)International Organization for Standardization (ISO), 1 rue de Varemb, Case postale 56, CH-1211 Geneva 20, Switzerland.SSPC-SP 14/NACE No. 8January 1, 200734.2 Before blast cleaning, surface imperfections such as sharp fins, sharp edges, w

33、eld 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 photographs or comparators are specified to supplement the w

34、ritten 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 Methods and operation5.1 Clean, dry compressed air shall

35、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 an industrial blast cleaned surface:5.2.1 Dry abrasive blasting using compressed air

36、, 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 with

37、centrifugal wheels and abrasive.5.3 Other methods of surface preparation (such as wet abrasive blast cleaning) may be used to achieve an industrial blast cleaned surface by mutual agreement between those responsible for for establishing the requirements and those responsible for performing the work.

38、 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 t

39、o 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 bla

40、st 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 embedment shall be included in the pr

41、ocurement documents (project specifica-tion) covering the work, because abrasive embedment and abrasives containing contaminants may not be acceptable for some service requirements. Additional information on abrasive selection is in Paragraph A6 of Appendix A.6.5 When a coating is specified, the cle

42、aned 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 immediately

43、 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 be removed

44、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 removed may pla

45、ce 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-tions (e.g., s

46、harp 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 requirements of Parag

47、raph 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 blast cleanin

48、g shall be removed by recleaning the SSPC-SP 14/NACE No. 8January 1, 20074references 1. SSPC-SP 7/NACE No. 4 (latest revision), “Brush-Off Blast Cleaning” (Pittsburgh, PA: SSPC, and Houston, TX: NACE).2. SSPC-SP 6/NACE No. 3 (latest revision), “Commercial Blast Cleaning” (Pittsburgh, PA: SSPC, and H

49、ouston, TX: NACE).3. SSPC-VIS 1 (latest revision), “Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning,” (Pittsburgh, PA: SSPC).4. ISO 8501-1 (latest revision), “Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings” (Geneva, Switzerland: ISO)5. SSPC-AB 1 (latest revision), “Mineral and Slag Abrasives” (Pittsburgh, PA: SSPC).6. SSPC-AB 2