SANS 2531-2010 Ductile iron pipes fittings accessories and their joints for water applications《输水用球墨铸铁管 配件 附件及其接头》.pdf

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 978-0-626-23900-8 SANS 2531:2010Edition 1ISO 2531:2009Edition 6SOUTH AFRICAN NATIONAL STANDARD Ductile iron pipes, fittings, accessories and their j

4、oints for water applications This national standard is the identical implementation of ISO 2531:2009 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 0001Tel: +27 12 4

5、28 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 2531:2010 Edition 1 ISO 2531:2009 Edition 6 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 and ductile iron pip

6、es 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. Reference numberISO 2531:2009(E)ISO 2009INTERNATIONAL STANDARD ISO2531Sixth edition2009-12-15Ductile iron pipes, fitting

7、s, accessories and their joints for water applications Tuyaux, raccords et accessoires en fonte ductile et leurs assemblages pour leau SANS 2531:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) PDF disclaimer This PDF file

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10、ation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2

11、009 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 permission in writing from either ISO at the address below or ISOs member body in the co

12、untry 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 2009 All rights reservedSANS 2531:2010This s tandard may only be used and printed by approved subscripti

13、on and freemailing clients of the SABS .ISO 2531:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Technical requirements 5 4.1 General .5 4.2 Pressure classification and dimensional requirements7 4.3 Material characterist

14、ics.11 4.4 Coating and linings for pipes.12 4.5 Coatings and linings for fittings and accessories .13 4.6 Marking.13 5 Leaktightness requirements.13 5.1 Pipes and fittings.13 5.2 Flexible joints.13 5.3 Flanged joints as cast, screwed, welded and adjustable15 6 Test methods .17 6.1 Dimensions 17 6.2

15、Straightness of pipes 17 6.3 Tensile test.17 6.4 Brinell hardness 19 6.5 Works leaktightness test of pipes and fittings.20 7 Type tests.20 7.1 Leaktightness of joints to internal pressure.20 7.2 Leaktightness of joints to external pressure21 7.3 Leaktightness of joints to negative internal pressure.

16、22 7.4 Leaktightness and mechanical resistance of flanged joints 22 8 Tables of dimensions23 8.1 Socket and spigot pipes .23 8.2 Flanged pipes 25 8.3 Fittings for socketed joints.25 8.4 Fittings for flanged joints .41 Annex A (informative) External protection .59 Annex B (informative) Internal prote

17、ction 60 Annex C (informative) Dimensions of preferred pressure classes and other pressure class pipes .61 Annex D (normative) Pipe wall thicknesses, stiffness and diametral deflection.63 Annex E (normative) Quality assurance.71 Annex F (informative) Safety factors 72 Bibliography73 SANS 2531:2010Th

18、is s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo

19、rk 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, governmental and non-governm

20、ental, 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/IEC Directives, Part 2. The

21、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 member bodies casting a vote.

22、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 2531 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings, Sub

23、committee SC 2, Cast iron pipes, fittings and their joints. This sixth edition cancels and replaces the fifth edition (ISO 2531:1998), of which it constitutes a technical revision. A new classification system for pipes and fittings based on pressure is introduced with minimum wall thickness determin

24、ed by allowable operating pressure. SANS 2531:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 2531:2009(E) ISO 2009 All rights reserved 1Ductile iron pipes, fittings, accessories and their joints for water appli

25、cations 1 Scope This International Standard specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints for the construction of pipelines: to convey water (e.g. for human consumption and raw water), operated with or without pressure, and insta

26、lled below or above ground. NOTE In this International Standard, all pressures are relative pressures expressed in bar 1). This International Standard specifies materials, dimensions and tolerances, mechanical properties and standard coatings of pipes, fittings and accessories. It also gives perform

27、ance requirements for all components including joints. This International Standard applies to pipes, fittings and accessories cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints in the size range DN 40 to DN 2600 inclusive. It is app

28、licable to pipes, fittings and accessories which are manufactured with socketed, flanged or spigot ends (joint design and gasket shapes are outside the scope of this International Standard), normally delivered internally and externally coated. Pipes and fittings are classified according to allowable

29、 operating pressure. 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 document (including any amendments) applies. ISO 4

30、016, Hexagon head bolts Product grade C ISO 4034, Hexagon nuts Product grade C ISO 4633, Rubber seals Joint rings for water supply, drainage and sewerage pipelines Specification for materials ISO 6506-1, Metallic materials Brinell hardness test - Part 1: Test method ISO 7005-2, Metallic flanges Part

31、 2: Cast iron flanges 1) 100 kPa = 1 bar SANS 2531:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) 2 ISO 2009 All rights reservedISO 7091, Plain washers Normal series Product grade C ISO 10803, Design method for ductile i

32、ron pipes ISO 10804, Restrained joint systems for ductile iron pipelines Design rules and type testing EN 1092-2, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 2: Cast iron flanges 3 Terms and definitions For the purposes of this document,

33、the following terms and definitions apply. 3.1 accessory any casting other than a pipe or fitting, which is used in a pipeline EXAMPLE 1 Glands and bolts for mechanical flexible joints (see 3.18). EXAMPLE 2 Glands, bolts and locking rings or segments for restrained joints (see 3.24). NOTE The term a

34、ccessory is not relevant for valves or hydrants of any type. 3.2 allowable operating pressure PFA maximum internal pressure, excluding surge, which a component can safely withstand in permanent service 3.3 allowable site test pressure PEA maximum hydrostatic pressure that a newly installed component

35、 can withstand for a relatively short duration, when either fixed above ground level or laid and backfilled underground, in order to measure the integrity and tightness of the pipeline NOTE This test pressure is different from the system test pressure, which is related to the design pressure of the

36、pipeline. 3.4 batch quantity of castings from which a sample may be taken for testing purposes during manufacture 3.5 component any product defined as an element of a pipe, fitting or accessory See 3.1, 3.9 and 3.22. 3.6 deviation amount by which the design length may differ from the standardized le

37、ngth of a pipe or a fitting NOTE Pipes and fittings are designed to a length selected in the range of standard length plus or minus the deviation (see Table 6); they are manufactured to this length plus or minus the tolerance given in Table 7. 3.7 diametral stiffness of a pipe characteristic of a pi

38、pe allowing it to resist diametral deflection under loading SANS 2531:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) ISO 2009 All rights reserved 33.8 ductile iron type of cast iron used for pipes, fittings and accessori

39、es in which graphite is present primarily in spheroidal form 3.9 fitting casting other than a pipe, which allows pipeline deviation, change of direction or bore NOTE Flanged sockets, flanged spigots and collars are also classified as fittings. 3.10 flange end of a pipe or fitting, extending perpendi

40、cular to its axis, with bolt holes equally spaced in a circle NOTE A flange can be fixed (e.g. integrally cast, screwed-on or welded-on) or adjustable. An adjustable flange comprises a ring, in one or several parts bolted together, which bears on an end joint hub and which can be freely rotated arou

41、nd the barrel axis before jointing. 3.11 flanged joint joint between two flanged ends 3.12 flexible joint joint providing significant angular deflection and movement parallel and/or perpendicular to the pipe axis 3.13 gasket sealing component of a joint 3.14 hoop stress stress in a pipe or fitting u

42、nder pressure, acting tangentially to the perimeter of a transverse section 3.15 joint connection between the ends of pipes and/or fittings in which a gasket is used to effect a seal 3.16 laying length Lelength by which a pipeline progresses when an additional pipe is installed NOTE 1 For socket and

43、 spigot pipes, it is equal to the total length of the pipe, Ltot, minus the maximum spigot insertion depth, Li, as given by the manufacturer and as shown in Figure 4. For flanged pipes, it is equal to the total length of the pipe. NOTE 2 It is expressed in metres. 3.17 maximum allowable operating pr

44、essure PMA maximum internal pressure, including surge, which a component can safely withstand in service 3.18 mechanical flexible joint flexible joint in which sealing is obtained by applying pressure to the gasket by mechanical means EXAMPLE A gland. SANS 2531:2010This s tandard may only be used an

45、d printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) 4 ISO 2009 All rights reserved3.19 nominal pressure PN numerical designation, which is a convenient rounded number, used for reference purposes NOTE 1 All components of the same nominal size, DN, designated by t

46、he same PN number have compatible mating dimensions. NOTE 2 Adapted from ISO 7268. 3.20 nominal size DN alphanumeric designation of size for components of a pipework system, which is used for reference purposes NOTE 1 It comprises the letters DN followed by a dimensionless whole number, which is ind

47、irectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections. NOTE 2 Adapted from ISO 6708:1995, definition 2.1. 3.21 ovality out-of-roundness of a pipe section, equal to Equation (1) ()()1212100A AA A+(1) where A1is the maximum axis, in millimetres; A

48、2is the minimum axis, in millimetres. 3.22 pipe casting of uniform bore, with straight axis, having either socket, spigot or flanged ends NOTE This does not apply to flanged sockets, flanged spigots and collars, which are classified as fittings. 3.23 push-in flexible joint flexible joint assembled b

49、y pushing the spigot through the gasket into the socket of the mating component 3.24 restrained joint joint in which a means is provided to prevent separation of the assembled joint 3.25 socket female end of a pipe or fitting to make the connection with the spigot of the next component 3.26 spigot male end of a pipe or fitting SANS 2531:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2531:2009(E) ISO 2009 All rights reserved 53.27 spigot end max