1、Guide to SSPC-VIS 1June 1, 2002Editorial Revisions November 1, 20042-331. ScopeThis guide describes the use of reference photographs depicting the appearance of both previously unpainted and previously painted and partially rusted hot-rolled carbon steel prior to and after abrasive blast cleaning. T
2、hese pho-tographs are intended to be used to supplement the written SSPC/NACE International blast cleaning surface preparation standards. The written standards are the primary means to determine conformance with blast cleaning requirements. The photographs shall not be used as a substitute for the w
3、ritten standards (see Note 7.1).2. DescriptionThe reference photographs consist of a series of 1:1 (actual size) color photographs that represent various conditions of unpainted and painted steel surfaces prior to and after surface preparation by abrasive blast cleaning. The photographs were taken u
4、nder controlled studio lighting designed to show the maximum detail possible. 3. Referenced Standards3.1 SSPC AND NACE INTERNATIONAL JOINT STANDARDS:SP 5/NACE No. 1 White Metal Blast CleaningSP 6/NACE No. 3 Commercial Blast CleaningSP 7/NACE No. 4 Brush-Off Blast CleaningSP 10/NACE No. 2 Near-White
5、Blast CleaningSP 14/NACE No. 8 Industrial Blast Cleaning4. Conditions Depicted4.1 These reference photographs illustrate ve initial rust conditions before surface preparation, covering the range from intact mill scale to rusted and pitted steel, as well as previously painted steel.1The rust conditio
6、ns are:Condition A: Steel surface completely covered with adherent mill scale; little or no rust visibleCondition B: Steel surface covered with both mill scale and rustCondition C: Steel surface completely covered with rust; little or no pitting visibleCondition D: Steel surface completely covered w
7、ith rust; pitting visible Condition G: Coating system applied over mill scale bearing steel; system thoroughly weath-ered, thoroughly blistered, or thoroughly stained Condition G1 In this series of photographs, exten-sive pinpoint rusting is present.Condition G2In this series of photographs, moder-a
8、te pitting is presentCondition G3 In this series of photographs, severe pitting is present.4.2 These reference photographs illustrate surfaces prepared by abrasive blast cleaning using silica sand with the exception of those in Appendix A (see Section 4.3). The various degrees of cleaning represente
9、d are:SSPC-SP 7/NACE No. 4 Brush-Off Blast CleaningSSPC-SP 14/NACE No. 8 Industrial Blast CleaningSSPC-SP 6/NACE No. 3 Commercial Blast CleaningSSPC-SP 10/NACE No. 2 Near-White Blast CleaningSSPC-SP 5/NACE No. 1 White Metal Blast Cleaning4.3 Appendix A: Photographs illustrative of some varia-tions i
10、n color, texture, and general appearance that can result from the choice of abrasive are provided in Appendix A (also see Note 7.2). These photographs represent Condition A (ad-herent mill scale) surfaces blast cleaned to SSPC-SP 5/NACE No. 1 (white metal) by mineral, slag, and metallic abrasives. T
11、he variations in appearance are depicted only for white metal; however, these same variations should be considered when assessing steel prepared to other degrees of cleaning. 4.4 Appendix B: These photographs illustrate how varia-tions in surface prole, view angle, and lighting can affect the appear
12、ance of G1 and G3surfaces blast cleaned to SSPC-SP 5/NACE No. 1.4.4.1 Prole Variations: The photographs labeled “P” show G1SP 5 and G3 SP 5 surfaces with a prole height of 4 1 Conditions E and F are described and illustrated in SSPC-VIS 4/NACE VIS 7.SSPC: The Society for Protective CoatingsGUIDE TO
13、SSPC-VIS 1Guide and Reference Photographs for Steel SurfacesPrepared by Dry Abrasive Blast CleaningGuide to SSPC-VIS 1June 1, 2002Editorial Revisions November 1, 20042-34mils (100 m). For comparison, a single photo of the same surface condition with a prole height of 1 mil (25 m) is also shown. The
14、lighting conditions were the same as those used in the G1 and G3series.4.4.2 Angle of View: The photographs labeled “H”, “L” and “D” show variations in appearance of the 4-mil (25 m) G1SP 5 P and G3SP 5 P specimens caused by differences in the angle at which the surface is viewed. Photographs labele
15、d “H” were taken at a high (i.e., nearly perpendicular) camera angle. Photographs labeled “L” were taken at a lower (more acute) camera angle.4.4.3 Diffusion of Light: The photographs labeled “D” were taken using diffused lighting, as may occur on a completely overcast day. Due to the diffused light
16、, no strong shadows ap-pear on the surface, regardless of the angle of view. However, these photographs show that diffused light may result in an overall color cast to the surface.5. Procedure5.1 Select the photograph of the condition (A, B, C, D, G1G2 or G3) that most closely represents the appeara
17、nce of the steel to be cleaned. The steel to be cleaned may contain more than one initial condition.5.2 Determine the degree of cleaning that is specied (SSPC-SP 7, SP 14, SP 6, SP 10, or SP 5).5.3 Use Table 1 to determine which photograph depicts the nished surface. For example, if the initial cond
18、ition is “C” and SSPC-SP 6 (commercial blast cleaning) is specied, use photograph C SP 6 (also see Note 7.3).5.4 Compare the prepared surface with the photograph selected in Section 5.3 to evaluate the degree of cleaning.5.5 These reference photographs shall be used only in conjunction with the writ
19、ten SSPC/NACE International surface preparation standards, as the reference photographs are based upon appearance only and do not address other factors neces-sary for compliance with the written specication. Steel surfaces show variations in texture, shade, color, tone, pitting, aking, mill scale, e
20、tc., which should be considered when making a comparison with the reference photographs.6. Disclaimer6.1 While every precaution is taken to ensure that all information furnished in SSPC guides and standards is as accurate, complete, and useful as possible, SSPC cannot assume any responsibility nor i
21、ncur any obligation resulting from the use of any materials or methods specied therein, or of the guides or standards themselves.6.2 This guide does not attempt to address problems concerning safety associated with its use. The user of this specication, as well as the user of all products or practic
22、es described herein, is responsible for instituting appropriate health and safety practices and for ensuring compliance with all governmental regulations.7. Notes7.1 This edition of SSPC-VIS 1 contains all of the pho-tographs contained in the 1989 edition. The written surface preparation standards,
23、such as SSPC-SP 5, are joint stan-dards of SSPC and NACE International and are identied as such in Section 3.3. This revised edition also contains pho-tographs of previously painted steel that has been abrasive blast cleaned.7.2 The photographs of nonmetallic abrasives in Appendix A illustrate the r
24、ange of appearance produced by nonmetallic abrasives as a class. Among the abrasives included in this class are silica sand, olivine sand, garnet, int shot, copper slag, coal slag, and nickel slag. The abrasive used for each photograph is not specically identied because noticeable variations in appe
25、arance were observed among the abrasives within a given generic class (e.g., copper slag).A similar set of photographs illustrates the range of ap-pearance produced by metallic abrasives as a class, which includes steel shot, steel grit, and combinations and modica-tions of these two abrasive media.
26、7.3 In addition to the photographs prepared from pre-viously painted steel shown in the Condition G series, the photographs in the Conditions A through D series prepared from unpainted steel are often found to be representative of the appearance of blast cleaned steel that was previously painted.Gui
27、de to SSPC-VIS 1June 1, 2002Editorial Revisions November 1, 20042-35Degree of CleaningCondition A100% Mill ScaleCondition BMill Scale and RustCondition C100% RustCondition D100% Rust with PitsCondition G1Weathered Coating Sys-tem Over Mill Scale with Extensive Pinpoint RustingCondition G2Weathered C
28、oating Sys-tem Over Mill Scale with Moderate PittingCondition G3Weathered Coating System Over Mill Scale with Severe PittingBrush-Off Blast Cleaning (SSPC-SP 7)See Footnote 1B SP 7 C SP 7 D SP 7 G1SP 7 G2SP 7 G3SP 7Industrial Blast Cleaning (SSPC-SP 14)See Footnote 2See Footnote 2See Footnote 2See F
29、ootnote 2G1SP 14 G2SP 14 G3SP 14Commercial Blast Cleaning (SSPC-SP 6)See Footnote 3B SP 6 C SP 6 D SP 6 G1SP 6 G2SP 6 G3SP 6Near-White Blast Cleaning (SSPC-SP 10)A SP 10 B SP 10 C SP 10 D SP 10 G1SP 10 G2SP 10 G3SP 10White Metal Blast Cleaning(SSPC-SP 5)A SP 5 B SP 5 C SP 5 D SP 5G1SP 5G1SP 5 P5G1SP
30、 5 HG1SP 5 LG1SP 5 DG2SP 5G3SP 5G3SP 5 P5G3SP 5 HG3SP 5 LG3SP 5 DTABLE 1INITIAL CONDITIONS1No photograph provided. The initial condition has only tightly adherent mill scale, which, according to the SSPC-SP 7 de nition, is not removed by brush-off blast cleaning.2SSPC-SP 14 can be achieved from thes
31、e conditions, but photographs are not available.3No photograph provided. The effort required to remove mill scale on Condition A steel typically results in less staining than the maximum 33% allowed by SP 6, approaching the photograph provided for A SP 10.4The photographs contained in Appendix A dep
32、ict the appearance of previously unpainted steel surfaces after blast cleaning to white metal with alternate abrasives (see Note 7.2).Alternate nonmetallic abrasives A SP 5 N1, A SP 5 N2, A SP 5 N3Alternate metallic abrasives: A SP 5 M1, A SP 5 M2, A SP 5 M3.5The photographs contained in Appendix B illustrate the effect of variations in pro le height (P), viewing angle (H, L), and diffusion of light (D) on the appearance of a pitted surface and a nonpitted surface.
