美国腐蚀工程师协会 NACE-NO-3.pdf

1994 NACE INTERNATIONAL NO. 3 Joint Surface Preparation Standard Commercial Blast Cleaning SSPC SP 6 1994Joint Surface Preparation StandardSSPC-SP 6/NACE No. 3Commercial Blast CleaningThis Steel Structures Painting Council (SSPC)/NACE International (NACE) standard represents a consensus ofthose individual members who have reviewed this document, its scope and provisions. Its acceptance does not inany respect preclude anyone, whether he has adopted the standard or not, from manufacturing, marketing,purchasing, or using products, processes, or procedures not in conformance with this standard. Nothing containedin this standard is to be construed as granting any right, by implication or otherwise, to manufacture, sell, or use inconnection with any method, apparatus, or product covered by Letters Patent, or as indemnifying or protectinganyone against liability for infringement of Letters Patent. This standard represents minimum requirements andshould in no way be interpreted as a restriction on the use of better procedures or materials. Neither is thisstandard intended to apply in all cases relating to the subject. Unpredictable circumstances may negate theusefulness of this standard in specific instances. SSPC and NACE assume no responsibility for the interpretation oruse of this standard by other parties and accept responsibility for only those official interpretations issued by SSPCor NACE in accordance with their respective governing procedures and policies, which preclude the issuance ofinterpretations by individual volunteers.Users of this standard are responsible for reviewing appropriate health, safety, and regulatory documents and fordetermining their applicability in relation to this standard prior to its use. This SSPC/NACE standard may notnecessarily address all safety problems and hazards associated with the use of materials, operations, and/orequipment detailed or referred to within this document.CAUTIONARY NOTICE: SSPC/NACE standards are subject to periodic review and may be revised or withdrawn atany time without prior notice. SSPC and NACE require that action be taken to reaffirm, revise, or withdraw thisstandard no later than five years from the date of initial publication. The user is cautioned to obtain the latestedition.©NACE InternationalP.O. Box 218340Houston TX 77218-8340713/492-0535©Steel Structures Painting Council[NO. 3] Copyright by NACE INTERNATIONAL (Thu Aug 24 09:33:20 2000)40 24th St., 6th FloorPittsburgh PA 15222ForewordThis joint standard covers the use of blast cleaning abrasives to achieve a defined degree of cleaning to steelsurfaces prior to the application of a protective coating or lining system. This standard is intended for use byspecifiers, applicators, inspectors, or others whose responsibility it may be to define a standard degree of surfacecleanliness.The focus of this standard is commercial blast cleaning. White metal blast cleaning, near-white blast cleaning, andbrush-off blast cleaning are addressed in separate standards.This standard was prepared by the SSPC/NACE Joint Task Group A on Surface Preparation by Abrasive BlastCleaning. This task group is comprised of members of both the SSPC Surface Preparation Committee and NACEUnit Committee T-6G on Surface Preparation.1. General1.1This standard covers the requirements for commercial blast cleaning of steel surfaces by the use of abrasives.1.2The mandatory requirements are described in Sections 1 to 9 as follows:TABLE - UNTITLED Section 1General Section 2Definitions Section 3Reference Documents Section 4Procedure Before Blast Cleaning Section 5Blast Cleaning Methods and Operation Section 6Blast Cleaning Abrasives Section 7Procedures Following Blast Cleaning and Immediately Prior to Coating Section 8Inspection Section 9Safety and Environmental Requirements1.3[NO. 3] Copyright by NACE INTERNATIONAL (Thu Aug 24 09:33:20 2000)Section 10, “Comments,“ and Appendix A, “Explanatory Notes,“ are not mandatory requirements of this standard.2. Definition2.1A commercial 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, except for staining asnoted in Section 2.2.2.2Random staining shall be limited to no more than 33 percent of each unit area of surface as defined in Section2.6, and may consist of light shadows, slight streaks, or minor discolorations caused by stains of rust, stains ofmill scale, or stains of previously applied coating.2.3Acceptable variations in appearance that do not affect surface cleanliness as defined in Section 2.1 includevariations caused by type of steel, original surface condition, thickness of the steel, weld metal, mill or fabricationmarks, heat treating, heat affected zones, blasting abrasive, and differences in the blast pattern.2.4When coating is specified, the surface shall be roughened to a degree suitable for the specified coating system.2.5Immediate。