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1、1994 NACE INTERNATIONAL NO. 4 Joint Surface Preparation Standard Brush-Off Blast Cleaning SSPC SP 7 1994Joint Surface Preparation StandardSSPC-SP 7/NACE No. 4Brush-Off Blast CleaningThis Steel Structures Painting Council (SSPC)/NACE International (NACE) standard represents a consensus ofthose indivi
2、dual 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. Noth
3、ing 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
4、. 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 s
5、pecific 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 i
6、ssuance 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 sa
7、fety 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to within this document.CAUTIONARY NOTICE: SSPC/NACE standards are subject to periodic review and may be revised or withdrawn atany time without prior notice.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 a
8、ction 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 77218-8340713-492-0535Steel Structures Painting CouncilNO. 4 Copyright by NACE IN
9、TERNATIONAL (Thu Aug 24 09:33:39 2000)40 24th St., 6th FloorPittsburgh, PA 15222ForewordThis joint standard covers the use of blast cleaning abrasives to achieve a defined degree of cleaning of steelsurfaces prior to the application of a protective coating or lining system. This standard is intended
10、 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 brush-off blast cleaning. White metal blast cleaning, near-white blast cleaning, andcommercial blast cleaning are addressed in sepa
11、rate 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
12、the requirements for brush-off 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 5Blas
13、t Cleaning Methods and Operation Section 6Blast Cleaning Abrasives Section 7Procedures Following Blast Cleaning and Immediately Prior to Coating Section 8Inspection Section 9Safety and Environmental RequirementsNO. 4 Copyright by NACE INTERNATIONAL (Thu Aug 24 09:33:39 2000)1.3Section 10, “Comments,
14、“ and Appendix A, “Explanatory Notes,“ are not mandatory requirements of this standard.2. Definition2.1A brush-off blast cleaned surface, when viewed without magnification, shall be free of all visible oil, grease, dirt,dust, loose mill scale, loose rust, and loose coating. Tightly adherent mill sca
15、le, rust, and coating may remain onthe surface. Mill scale, rust, and coating are considered tightly adherent if they cannot be removed by lifting with adull putty knife.2.2The entire surface shall be subjected to the abrasive blast. The remaining mill scale, rust, or coating shall betight.2.3When c
16、oating is specified, the surface shall be roughened to a degree suitable for the specified coating system.2.4Immediately prior to coating application, the surface shall comply with the degree of cleaning as specified herein.2.5Visual standards or comparators may be specified to supplement the written definition. In any dispute, thewritten standards shall take precedence over visual standards and comparators. Additional information on visualstandards is given in Section A.4 of Appendix
