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 978-0-626-23905-3 SANS 8179-1:2010Edition 1ISO 8179-1:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Ductile iron pipes External zinc-based coating Pa
4、rt 1: Metallic zinc with finishing layer This national standard is the identical implementation of ISO 8179-1:2004 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 000
5、1Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 8179-1:2010 Edition 1 ISO 8179-1:2004 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 138C, Water and sanitation Equipment and systems Cast an
6、d ductile iron pipes and fittings, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in March 2010. INTERNATIONALSTANDARDISO8179-1Second edition2004-06-01Reference numberISO 8179-1:2004(E) ISO 2004Ducti
7、le iron pipes External zinc-based coating Part 1:Metallic zinc with finishing layerTuyaux en fonte ductile Revtement extrieur base de zinc Partie 1: Zinc mtallique avec couche de finitionSANS 8179-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of t
8、he SABS .ISO 8179-1:2004(E)ii ISO 2004 All rights reservedPDF disclaimerThis PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shallnot be edited unless the typefaces which are embedded are licensed to and installed on the com
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11、ral Secretariat at the address given below. ISO 2004All 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 permission in writing from either ISO at
12、the address below orISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandSANS 8179-1:2010This s tandard may only be used and printed by approved s
13、ubscription and freemailing clients of the SABS .ISO 8179-1:2004(E) ISO 2004 All rights reserved iiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standards is normally ca
14、rried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. I
15、SO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare Internationa
16、l Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements
17、 of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 8179-1 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings,Subcommittee SC 2, Cast iron pipes, fittings and their joints.This
18、second edition cancels and replaces the first edition (ISO 8179-1:1995), which has been technicallyrevised.ISO 8179 consists of the following parts, under the general title Ductile iron pipes External zinc-basedcoating: Part 1: Metallic zinc with finishing layer Part 2: Zinc rich paint with finishin
19、g layerSANS 8179-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ivSANS 8179-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 8179-1:2004(E) ISO 2
20、004 All rights reserved 1Ductile iron pipes External zinc-based coating Part 1:Metallic zinc with finishing layer1ScopeThis part of ISO 8179 deals with an external protective coating system which is factory applied to centrifugallycast ductile iron pipes as specified in ISO 2531 and ISO 7186. This c
21、oating system comprises a metallic zinclayer followed by a finishing layer.NOTE ISO 8179-2 deals with zinc rich paint with finishing layer.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited appl
22、ies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 2531:1998, Ductile iron pipes, fittings, accessories and their joints for water or gas applicationsISO 2808:1997, Paints and varnishes Determination of film thicknessISO 7186:1996, Ductil
23、e iron products for sewage applications3 MaterialsThe coating materials shall be metallic zinc with a zinc content of at least by mass, and bituminouspaint or synthetic resin compatible with zinc.4 Zinc coating4.1 Pipe surface conditionThe pipe surface shall be dry and free from rust or any non-adhe
24、ring particles or foreign matter such as oil orgrease.The zinc shall be applied to the as-cast annealed external surface of the pipe, or to a blast-cleaned or groundsurface, at the manufacturers discretion.4.2 Method of applicationThe metallic zinc coating shall be applied by a spraying process in w
25、hich metallic zinc is heated to a moltenstate and projected in small droplets by spray guns on to the pipe surface.The design and construction of the spray equipment is not within the scope of this part of ISO 8179.99,99 %SANS 8179-1:2010This s tandard may only be used and printed by approved subscr
26、iption and freemailing clients of the SABS .ISO 8179-1:2004(E)2 ISO 2004 All rights reserved4.3 Coating characteristicsThe metallic zinc coating shall cover the outside cylindrical surface of the pipe and shall be free from defectssuch as bare patches or lack of adhesion.A spiralled appearance is pe
27、rmissible provided that the zinc coating masses comply with the requirements of4.4.The manufacturer shall define those coating irregularities which are considered not detrimental to theperformance of the coating system.Damaged areas of zinc coating caused by handling are acceptable, provided that th
28、e area of damage is lessthan per square metre and that the minor dimension of the damaged area does not exceed .Greater areas of damage shall be repaired in accordance with 4.5.4.4 Zinc coating massThe mean mass of zinc coating measured in accordance with 6.1 shall be not less than with a localminim
29、um of .The manufacturer shall visually inspect each pipe for quality and uniformity of coating and shall carry out regularmeasurements of zinc coating masses in accordance with the method described in 6.1.4.5 Repairs to the zinc coatingAreas left uncoated, e.g. under the test token, and coating dama
30、ge in excess of that permitted in 4.3 shall berepaired by one of the following methods:a) metallic zinc spray complying with 4.2;b) application of zinc-rich paint containing more than zinc, by mass, in the dried film; the mean mass ofthe applied paint shall be not less than .5 Finishing layerAfter z
31、inc coating, the pipe shall be given a finishing layer of bituminous paint or synthetic resin compatible withthe zinc coating.Application of this finishing layer may be done by any proven process such as spraying or brush coating at themanufacturers discretion. It shall uniformly cover the zinc coat
32、ing and be free from bare patches or lack ofadhesion.The mean dry film thickness of the finishing layer measured in accordance with 6.2 shall be not less than with a local thickness not less than .In order to avoid blistering, the mean dry film thickness of the finishing layer shall not exceed .6 Te
33、st methods6.1 Zinc coating massA rectangular token is attached along the pipe axis before passing it through the zinc coating equipment. Aftercoating and trimming, the minimum token sizes shall be eithera) orb) .5cm25mm130 g/m2110 g/m285 %150 g/m270 m50 m250 m250 mm 100 mm500 mm 50 mmSANS 8179-1:201
34、0This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 8179-1:2004(E) ISO 2004 All rights reserved 3The token shall be a film of consistent thickness and density, morphologically stable at the temperature of thesubstrate during zinc application
35、 and used as a surrogate surface for the measurement of coating thicknesses.The mean mass of zinc coating, , expressed in grams per square metre, is calculated from the massdifference of the token before and after zinc coating using the following formula:whereis a correction factor depending on the
36、material of the token, taking into account thedifference in surface roughness between the token and the pipe surface;and are masses, in grams, before and after zinc coating, measured to an accuracy of ;is the area of the token, in square metres.The value of shall be determined by the manufacturer an
37、d specified when required in test documents.NOTE For information, lies between 1,0 and 1,2 for sand-blasted steel sheet or polyester sheet.The uniformity of the zinc coating is checked by visual inspection of the token. In the event of lack of uniformity,pieces shall be cut from the token in those z
38、ones which appear to have the lower coatingmass and the local minimum mass of zinc shall be determined according to the above method.6.2 Thickness of finishing layerThe dry film thickness of the finishing layer shall be measured indirectly after coating on a sample token whichis attached to the pipe
39、 before coating.A rectangular token is attached along the pipe axis before coating. After coating and trimming, the minimumtoken sizes shall be eithera) orb) .The token shall be a film of consistent thickness and density, morphologically stable at the temperature of thesubstrate during the coating a
40、pplication and used as a surrogate surface for the measurement of coatingthicknesses.The dry film thickness is measured either by means of a micrometer or by a weighing method similar to 6.1.The mean dry film thickness is either the average of ten or more micrometer readings evenly distributed over
41、the surface of the token (aftersubstraction of the mean thickness of the bare token from each reading) or the thickness calculated from the mean mass of finishing layer (measured on the token) and the density ofthe dry film.The uniformity of the coating is checked by visual inspection of the token.
42、In the event of lack of uniformity,pieces shall be cut from the token in those zones which appear to have the lower coatingmass and the local minimum thickness shall be determined according to the above method. The local minimumthickness is either: the average of four micrometer readings evenly dist
43、ributed on the surface of a piece or the thickness calculated from the mass of finishing layer (measured on a piece).mm=C(m2m1)ACm1m20,1 gACC50 mm 50 mm250 mm 100 mm500 mm 50 mm50 mm 50 mm50 mm 50 mm50 mm 50 mmSANS 8179-1:2010This s tandard may only be used and printed by approved subscription and f
44、reemailing clients of the SABS .ISO 8179-1:2004(E)4 ISO 2004 All rights reservedAs an alternative to the above reference method, the dry film thickness may also be measured directly on thepipes by means of suitable gauges, e.g. magnetic, or by using a “wet film” thickness gauge where a correlationbe
45、tween wet film thickness and dry film thickness can be demonstrated, or by any appropriate method asdefined in ISO 2808.NOTE The method of measurement is at the manufacturers discretion.SANS 8179-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of th
46、e SABS .SABS Standards Division The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. This objective is incorporated in the Standards Act, 2008 (Act No. 8 of 2008). Amendments and Revisions South African National Standards are updated by a
47、mendment or revision. Users of South African National Standards should ensure that they possess the latest amendments or editions. The SABS continuously strives to improve the quality of its products and services and would therefore be grateful if anyone finding an inaccuracy or ambiguity while usin
48、g this standard would inform the secretary of the technical committee responsible, the identity of which can be found in the foreword. Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928 The SABS offers an individual notification service, which ensures that subscribers automatically receive notificati
49、on regarding amendments and revisions to South African National Standards. Tel: +27 (0) 12 428 6883 Fax: +27 (0) 12 428 6928 E-mail: salessabs.co.za Buying Standards Contact the Sales Office for South African and international standards, which are available in both electronic and hardcopy format. Tel: +27 (0) 12 428 6883 Fax: +27 (0) 12 428 6928 E-mail: salessabs.co.za South African National Standards are also available online from the SABS website http:/www.sabs.co.za Information on Standards The Standa
