1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21220-9 SANS 8501-3:2008Edition 1ISO 8501-3:2006Edition 2SOUTH AFRICAN NATIONAL STANDARD Preparation of steel substrates before applicatio
4、n of paints and related products Visual assessment of surface cleanliness Part 3: Preparation grades of welds, edges and other areas with surface imperfections This national standard is the identical implementation of ISO 8501-3:2006 and is adopted with the permission of the International Organizati
5、on for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 8501-3:2008 Edition 1 ISO 8501-3:2006 Edition 2 Table of changes Change
6、No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 5140.11D, Paints and varnishes Industrial coatings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in M
7、ay 2008. Reference numberISO 8501-3:2006(E)ISO 2006INTERNATIONAL STANDARD ISO8501-3Second edition2006-03-01Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 3: Preparation grades of welds, edges and other areas with surfac
8、e imperfections Prparation des subjectiles dacier avant application de peintures et de produits assimils valuation visuelle de la propret dun subjectile Partie 3: Degrs de prparation des soudures, artes et autres zones prsentant des imperfections SANS 8501-3:2008This s tandard may only be used and p
9、rinted by approved subscription and freemailing clients of the SABS .ISO 8501-3:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are lice
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12、to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without p
13、ermission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights r
14、eservedSANS 8501-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 8501-3:2006(E) ISO 2006 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
15、 (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,
16、governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/
17、IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the me
18、mber bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8501-3 was prepared by Technical Committee ISO/TC 35, Paints and varn
19、ishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products. This second edition cancels and replaces the first edition (ISO 8501-3:2001). The main changes are: revision of the description of preparation grade P1 in Clause 4 and the preparation grades
20、 for welding spatter and undercut in Table 1; replacement of the phrases “as found”, “as welded”, etc., with “no preparation”; deletion of Annex A “Correlation between preparation grades and corrosivity categories”. ISO 8501 consists of the following parts, under the general title Preparation of ste
21、el 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 Informative Supplement to Part 1: Representative photog
22、raphic examples of the change of appearance imparted to steel when blast-cleaned with different abrasives Part 2: Preparation grades of previously coated steel substrates after localized removal of previous coatings Part 3: Preparation grades of welds, edges and other areas with surface imperfection
23、s Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with high-pressure water jetting SANS 8501-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 8501-3:2006(E) iv ISO 2006 All rights reservedIn
24、troduction The performance of protective coatings of paint and related products applied to steel is significantly affected by the state of the steel surface immediately prior to painting. The principal factors that are known to influence this performance are: a) the presence of rust and mill scale;
25、b) the presence of surface contaminants, including salts, dust, oils and greases; c) the surface profile. International Standards ISO 8501, ISO 8502 and ISO 8503 have been prepared to provide methods of assessing these factors, while ISO 8504 provides guidance on the preparation methods that are ava
26、ilable for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness. These International Standards do not contain recommendations for the protective coating system to be applied to the steel surface. Neither do they contain recommendations for the s
27、urface quality requirements for specific situations even though surface quality can have a direct influence on the choice of protective coating to be applied and on its performance. Such recommendations are given in other documents such as national standards and codes of practice. Users of these Int
28、ernational Standards should ensure the qualities specified are: compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the protective coating system to be used; within the capability of the cleaning procedure specified. The four International Stan
29、dards referred to above deal with the following aspects of preparation of steel substrates: ISO 8501 Visual assessment of surface cleanliness; ISO 8502 Tests for the assessment of surface cleanliness; ISO 8503 Surface roughness characteristics of blast-cleaned steel substrates; ISO 8504 Surface prep
30、aration methods. Each of these International Standards is in turn divided into separate parts. Imperfections at welds, edges and other areas of steel substrates are generally starting points for corrosion. Such areas are also difficult to protect by application of paints and related products. To ass
31、ist in achieving efficient corrosion protection, this part of ISO 8501 defines certain imperfections and preparation grades for such areas. SANS 8501-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 8501-3:2006
32、(E) ISO 2006 All rights reserved 1Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 3: Preparation grades of welds, edges and other areas with surface imperfections 1 Scope This part of ISO 8501 describes preparation grade
33、s of welds, edges and other areas, on steel surfaces with imperfections. Such imperfections can become visible before and/or after an abrasive blast-cleaning process. The preparation grades given in this part of ISO 8501 are to make steel surfaces with imperfections, including welded and fabricated
34、surfaces, suitable for the application of paints and related products. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced
35、document (including any amendments) applies. ISO 12944-2, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 2: Classification of environments ISO 12944-3, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 3: De
36、sign considerations 3 Types of imperfection This part of ISO 8501 deals with imperfections on: welds; edges; steel surfaces generally. The various types of imperfection are illustrated and described in Table 1. SANS 8501-3:2008This s tandard may only be used and printed by approved subscription and
37、freemailing clients of the SABS .ISO 8501-3:2006(E) 2 ISO 2006 All rights reserved4 Preparation grades Three preparation grades for making steel surfaces with visible imperfections suitable for the application of paints and related products are as follows: P1 Light preparation: no preparation or onl
38、y minimum preparation needs to be carried out before application of paint; P2 Thorough preparation: most imperfections are remedied; P3 Very thorough preparation: surface is free of significant visible imperfections. The significance of visible imperfections should preferably be agreed between all r
39、elevant parties, depending on the specific application. Requirements for the preparation grades are given in Table 1. NOTE 1 It is important that the preparation methods used to achieve these preparation grades are not deleterious to the integrity of the steel surface or welded areas. For example, s
40、trong grinding pressure can result in the formation of heat-affected areas on a steel surface, and removal of defects by grinding can leave sharp edges at the edges of the grind pattern. NOTE 2 It is possible that different imperfections on a structure will require different preparation grades. For
41、example, undercut (Table 1, 1.4) might require P3 preparation while all other imperfections might require P2 preparation. This can, in particular, be the case when there are requirements for the aesthetic appearance of the finish. In such cases, P3 could be specified even if there were no apparent c
42、orrosivity requirements (see ISO 12944-2). NOTE 3 A replica, known as NACE standard RP 0178, showing examples of weld imperfections and certain levels of preparation, can be obtained from NACE International, PO Box 218340, Houston, Texas 77218-8340, USA. SANS 8501-3:2008This s tandard may only be us
43、ed and printed by approved subscription and freemailing clients of the SABS .ISO 8501-3:2006(E) ISO 2006 All rights reserved 3Table 1 Imperfections and preparation grades Type of imperfection Preparation grades Description Illustration P1 P2 P3 1 Welds 1.1 Welding spatter Surface shall be free of al
44、l loose welding spatter see a) Surface shall be free of all loose and lightly adhering welding spatter see a) and b) Welding spatter shown in c) may remain Surface shall be free of all welding spatter 1.2 Weld ripple/profile No preparation Surface shall be dressed (e.g. by grinding) to remove irregu
45、lar and sharp- edged profiles Surface shall be fully dressed, i.e. smooth 1.3 Welding slag Surface shall be free from welding slag Surface shall be free from welding slag Surface shall be free from welding slag 1.4 Undercut No preparation Surface shall be free from sharp or deep undercuts Surface sh
46、all be free from undercuts 1.5 Weld porosity Key 1 visible 2 invisible (might open after abrasive blast cleaning) No preparation Surface pores shall be sufficiently open to allow penetration of paint, or dressed out Surface shall be free from visible pores 1.6 End craters No preparation End craters
47、shall be free from sharp edges Surface shall be free from visible end craters SANS 8501-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 8501-3:2006(E) 4 ISO 2006 All rights reservedTable 1 (continued) Type of imperfection Preparatio
48、n grades Description Illustration P1 P2 P3 2 Edges 2.1 Rolled edges No preparation No preparation Edges shall be rounded with a radius of not less than 2 mm (see ISO 12944-3) 2.2 Edges made by punching, shearing, sawing or drilling Key 1 punching 2 shearing No part of the edge shall be sharp; the ed
49、ge shall be free from fins No part of the edge shall be sharp; the edge shall be free from fins Edges shall be rounded with a radius of not less than 2 mm (see ISO 12944-3) 2.3 Thermally cut edges Surface shall be free of slag and loose scale No part of the edge shall have an irregular profile Cut face shall be removed and edges shall be rounded with a radius of not less than 2 mm (see ISO 12944-3) 3 Surfaces generally 3.1 Pits and craters Pits and craters shall be sufficiently open to
