1、Ductile iron pipes, fittings, accessories and their joints - External zinc-based coating Part 2: Zinc-rich paint BS ISO 8179-2:2017 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017 Ductile iron pipes, fittings, accessories and their joints External zinc-bas
2、ed coating Part 2: Zinc-rich paint Tuyaux, raccords et accessoires en fonte ductile et leurs assemblages Revtement extrieur base de zinc Partie 2: Peinture riche en zinc INTERNATIONAL STANDARD ISO 8179-2 Second edition 2017-07 Reference number ISO 8179-2:2017(E) National foreword This British Standa
3、rd is the UK implementation of ISO 8179-2:2017.The UK participation in its preparation was entrusted to Technical Committee PSE/10, Iron pipes and fittings. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include
4、 all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017Published by BSI Standards Limited 2017 ISBN 978 0 580 93437 7 ICS 77.140.75; 23.040.10 Compliance with a British Standard cannot confer immunity from legal obligatio
5、ns. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017. Amendments/corrigenda issued since publication Date Text affected BRITISH STANDARD BS ISO 81792:2017 ISO 2017 Ductile iron pipes, fittings, accessories and their joints Ex
6、ternal zinc-based coating Part 2: Zinc-rich paint Tuyaux, raccords et accessoires en fonte ductile et leurs assemblages Revtement extrieur base de zinc Partie 2: Peinture riche en zinc INTERNATIONAL STANDARD ISO 8179-2 Second edition 2017-07 Reference number ISO 8179-2:2017(E) BS ISO 81792:2017 ISO
7、8179-2:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocop
8、ying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 74
9、9 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org BS ISO 81792:2017 ISO 8179-2:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized oth
10、erwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright offic
11、e Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgISO 8179-2:2017(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Materials . 1 5 Zinc-rich paint coating . 1 5.1 Pipeline component
12、 surface condition 1 5.2 Method of application . 1 5.3 Coating characteristics . 2 5.4 Zinc-rich paint coating mass . 2 5.5 Repairs to the zinc-rich paint coating . 2 6 Finishing layer . 2 7 Test methods . 3 7.1 Determination of zinc-rich paint coating mass . 3 7.2 Determination of the dry film thic
13、kness of the finishing layer 3 Annex A (informative) Field verification of the zinc-rich paint coating mass on a finished product 4 Annex B (informative) Field of use in relation to the characteristics of soils: Standard coating .6 Bibliography 7 ISO 2017 All rights reserved iii Contents Page BS ISO
14、 81792:2017 ISO 8179-2:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body intere
15、sted in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
16、Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO docume
17、nts should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). 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 respons
18、ible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents). Any trade name used in this document is information give
19、n for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) princi
20、ples in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html. This document 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 second edition cancels a
21、nd replaces the first edition (ISO 8179-2:1995), which has been technically revised. The following changes have been made: the minimum quantity of Zn has been increased from 130 g/m 2to 200 g/m 2 ; the revision recognizes the technological advancements in the field regarding zinc-based coatings to i
22、ncrease the lifetime and reliability of ductile iron pipelines, improving protection to different types of corrosion (including general and localized) and the use of new alloy enrichments. A list of all parts in the ISO 8179 series can be found on the ISO website.iv ISO 2017 All rights reserved BS I
23、SO 81792:2017 ISO 8179-2:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body inte
24、rested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnica
25、l Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO docu
26、ments should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). 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 respo
27、nsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents). Any trade name used in this document is information gi
28、ven for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) prin
29、ciples in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html. This document 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 second edition cancels
30、 and replaces the first edition (ISO 8179-2:1995), which has been technically revised. The following changes have been made: the minimum quantity of Zn has been increased from 130 g/m 2to 200 g/m 2 ; the revision recognizes the technological advancements in the field regarding zinc-based coatings to
31、 increase the lifetime and reliability of ductile iron pipelines, improving protection to different types of corrosion (including general and localized) and the use of new alloy enrichments. A list of all parts in the ISO 8179 series can be found on the ISO website.iv ISO 2017 All rights reserved IN
32、TERNATIONAL ST ANDARD ISO 8179-2:2017(E) Ductile iron pipes, fittings, accessories and their joints External zinc-based coating Part 2: Zinc-rich paint 1 Scope This document specifies an external protective coating system which is factory-applied to ductile iron pipeline components as specified in I
33、SO 2531, ISO 7186 and ISO 16631. This coating system comprises a zinc-rich paint followed by a finishing layer that can be bituminous paint or synthetic resin compatible with zinc rich paint coating. NOTE ISO 8179-1 addresses metallic zinc-based coatings. 2 Normative references There are no normativ
34、e references in this document. 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing plat
35、form: available at h t t p :/ www .iso .org/ obp 4 Materials The coating materials shall be zinc-rich paint with organic or/and inorganic binder and zinc content of at least a mass fraction of 85 % in the dry film followed by a finishing layer that can be bituminous paint or synthetic resin compatib
36、le with zinc-rich paint coating. 5 Zinc-rich paint coating 5.1 Pipeline component surface condition The pipeline component surface shall be dry and free from rust or any non-adhering particles or foreign matter such as oil or grease. The zinc-rich paint coating shall be applied to the as-cast anneal
37、ed external surface of the pipeline component or to a blast-cleaned or ground surface at the manufacturers discretion. 5.2 Method of application The zinc-rich paint coating shall be applied by a spraying or brushing process onto the pipeline component surface. The design and construction of the spra
38、y equipment are not within the scope of this document. ISO 2017 All rights reserved 1 BS ISO 81792:2017 ISO 8179-2:2017(E) 5.3 Coating characteristics The zinc-rich paint coating shall cover the outside cylindrical surface of the pipeline component and shall be free from such defects as bare patches
39、 or lack of adhesion. A spiralled appearance is permissible provided that the zinc-rich paint coating masses comply with the requirements of 5.4. The manufacturer shall define those coating irregularities which are considered not detrimental to the performance of the coating system. Damaged areas of
40、 zinc-rich paint coating caused by handling are acceptable, provided that the area of damage is less than 5 cm 2per square metre and that the minor dimension of the damaged area does not exceed 5 mm. Greater areas of damage shall be repaired in accordance with 5.5. 5.4 Zinc-rich paint coating mass T
41、he mean mass of zinc-rich paint coating measured in accordance with 7.1 shall be as follows: not less than 235 g/m 2with a local minimum of 210 g/m 2 ; in low corrosive areas, by agreement between the purchaser and the supplier, 150 g/m 2with a local minimum of 130 g/m 2 . NOTE The masses of zinc-ri
42、ch paint coating are equivalent to 200 g/m 2with a local minimum of 180 g/m 2of metallic zinc coating (first case) and 130 g/m 2with a local minimum of 110 g/m 2of that (second case). Where there are very corrosive soils the manufacturer and the purchaser may decide to use an additional coating mass
43、 of zinc-rich paint. For the selection of coatings in relation to the characteristics of soils Annex B can be consulted. The manufacturer shall visually inspect each pipeline component for quality and uniformity of coating and shall carry out regular measurements of zinc-rich paint coating masses in
44、 accordance with the method described in 7.1. The factory quality control tests ensure conformity to the standard. Where informative field verification is required, one of the methods described in Annex A shall be agreed upon between the manufacturer and the purchaser. 5.5 Repairs to the zinc-rich p
45、aint coating The manufacturer is permitted to carry out repairs by zinc-rich paint containing more than 85 % zinc in the dry film provided that the requirements of Clause 4, 5.3 and 5.4 are met. 6 Finishing layer After the zinc-rich paint coating has been applied, the pipeline component shall be giv
46、en a finishing layer of bituminous paint or synthetic resin compatible with the zinc-rich paint coating. Application of this finishing layer may be done by any proven process such as spraying or brush coating at the manufacturers discretion. It shall uniformly cover the zinc-rich paint coating and b
47、e free from bare patches or lack of adhesion. The mean dry film thickness of the finishing layer measured in accordance with 7.2 shall be not less than 70 m with a local minimum thickness of 50 m. The method of coating thickness is at the manufacturers discretion.2 ISO 2017 All rights reserved BS IS
48、O 81792:2017 ISO 8179-2:2017(E) 5.3 Coating characteristics The zinc-rich paint coating shall cover the outside cylindrical surface of the pipeline component and shall be free from such defects as bare patches or lack of adhesion. A spiralled appearance is permissible provided that the zinc-rich pai
49、nt coating masses comply with the requirements of 5.4. The manufacturer shall define those coating irregularities which are considered not detrimental to the performance of the coating system. Damaged areas of zinc-rich paint coating caused by handling are acceptable, provided that the area of damage is less than 5 cm 2per square metre and that the minor dimension of the damaged area does not exceed 5 mm. Greater areas of damage shall be repaired in accordance with 5.5. 5.4 Zinc-rich paint c
