1、 Reference number ISO 7186:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 7186 Third edition 2011-07-15 Ductile iron products for sewerage applications Produits en fonte ductile pour lassainissement ISO 7186:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, n
2、o 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 country of the requester. ISO copyright office Case post
3、ale 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 2011 All rights reservedISO 7186:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2
4、 4 Technical requirements 7 4.1 General .7 4.2 Pressure classification .9 4.3 Dimensional requirements .9 4.4 Material characteristics.13 4.5 Coatings and linings for pipes.14 4.6 Coatings for fittings and accessories .14 4.7 Systems design requirements .15 4.8 Leaktightness of pipeline components.1
5、5 4.9 Marking.15 5 Performance requirements.16 5.1 Leaktightness of joints .16 5.2 Diametral stiffness 17 5.3 Chemical resistance18 5.4 Abrasion resistance 18 6 Test methods and test frequencies .18 6.1 Dimensions 18 6.2 Straightness of pipes 19 6.3 Tensile test.19 6.4 Brinell hardness 21 6.5 Works
6、leaktightness test of pipes and fittings for pressure applications 21 6.6 Works leaktightness test of pipes and fittings for vacuum applications 22 7 Type tests.22 7.1 Leaktightness of gravity pipeline components22 7.2 Leaktightness of joints to internal pressure.22 7.3 Leaktightness of joints to ex
7、ternal pressure23 7.4 Leaktightness of joints to negative internal pressure.24 7.5 Diametral stiffness of pipe24 7.6 Chemical resistance to effluents .26 7.7 Abrasion resistance 27 8 Tables of dimensions28 8.1 Socket and spigot pipes .28 8.2 Fittings for gravity applications.30 8.3 Fittings for pres
8、sure and vacuum applications .32 Annex A (informative) External protection .33 Annex B (informative) Internal protection 34 Annex C (normative) Allowable pressure for pressure sewers .35 Bibliography36 ISO 7186:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for S
9、tandardization) 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 interested in a subject for which a technical committee has been established has the ri
10、ght 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 Commission (IEC) on all matters of electrotechnical standardization. Internationa
11、l 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 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as
12、an International 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 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
13、 7186 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 third edition cancels and replaces the second edition (ISO 7186:1996), which has been technically revised. A new classification system fo
14、r pipes and fittings based on pressure is introduced with minimum wall thickness determined by allowable operating pressure. INTERNATIONAL STANDARD ISO 7186:2011(E) ISO 2011 All rights reserved 1Ductile iron products for sewerage applications 1 Scope This International Standard specifies the require
15、ments and test methods applicable to ductile iron pipes, fittings, accessories and their joints for the construction of drains and sewers outside buildings: to convey surface water (e.g. rainwater), domestic waste water and/or certain types of industrial effluents, either in separate systems or in c
16、ombined systems; operating without pressure (gravity sewers) or with positive or negative pressure; for installation below or above ground. NOTE In this International Standard, all pressures are relative pressures expressed in bar 1) . This International Standard contains specifications for material
17、s, dimensions and tolerances, mechanical properties and standard coatings of pipes, fittings and accessories. It also gives performance requirements for all components including joints. This International Standard is applicable to pipes, fittings and accessories cast by any type of foundry process o
18、r manufactured by fabrication of cast components, as well as corresponding joints, in the size range DN 80 to DN 2600 inclusive. It is applicable to pipes, fittings and accessories which are manufactured with socketed, flanged or spigot ends (joint design and gasket shape are outside the scope of th
19、is International Standard), and normally delivered internally and externally coated. 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 t
20、he referenced document (including any amendments) applies. ISO 2531, Ductile iron pipes, fittings, accessories and their joints for water applications ISO 4016, Hexagon head bolts Product grade C ISO 4034, Hexagon nuts Product grade C ISO 4633, Rubber seals Joint rings for water supply, drainage and
21、 sewerage pipelines Specification for materials ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method 1) 100 kPa = 1 bar = 0,1 MPa; 1 MPa = 1 N/mm 2 . ISO 7186:2011(E) 2 ISO 2011 All rights reservedISO 7005-2, Metallic flanges Part 2: Cast iron flanges ISO 7091, Plain washers Norm
22、al series Product grade C 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
23、 this document, the following terms and definitions apply. 3.1 ductile iron type of cast iron used for pipes, fittings and accessories in which graphite is present primarily in spheroidal form ISO 2531:2009, definition 3.8 3.2 pipe casting of uniform bore, with straight axis, having either socket, s
24、pigot or flanged ends NOTE This does not apply to flanged sockets, flanged spigots and collars, which are classified as fittings. ISO 2531:2009, definition 3.22 3.3 fitting casting other than a pipe, which allows pipeline deviation, change of direction or bore NOTE Flanged sockets, flanged spigots a
25、nd collars are also classified as fittings. ISO 2531:2009, definition 3.9 3.4 accessory any casting other than a pipe or fitting, which is used in a pipeline EXAMPLE 1 Glands and bolts for mechanical flexible joints. EXAMPLE 2 Glands, bolts and locking rings or segments for restrained joints. ISO 25
26、31:2009, definition 3.1 3.5 inspection chamber component of a discharge system, of a drain or of a sewer providing access from the ground surface for inspection and maintenance equipment 3.6 manhole component of a sewer of sufficient size to provide access from the ground surface for inspection and
27、maintenance operations by personnel and equipment ISO 7186:2011(E) ISO 2011 All rights reserved 33.7 flange end of a pipe or fitting, extending perpendicular to its axis, with bolt holes equally spaced on a circle NOTE A flange can be fixed (e.g. integrally cast, screwed-on or welded-on) or adjustab
28、le. An adjustable flange comprises a ring, in one or several parts bolted together, which bears on an end joint hub and can be freely rotated around the barrel axis before jointing. ISO 2531:2009, definition 3.10 3.8 spigot male end of a pipe or fitting ISO 2531:2009, definition 3.26 3.9 spigot end
29、maximum insertion depth of the spigot, L i , plus 50 mm ISO 2531:2009, definition 3.27 See Figure 5. 3.10 socket female end of a pipe or fitting to make the connection with the spigot of the next component ISO 2531:2009, definition 3.25 3.11 gasket sealing component of a joint ISO 2531:2009, definit
30、ion 3.13 3.12 joint connection between the ends of pipes and/or fittings in which a gasket is used to effect a seal ISO 2531:2009, definition 3.15 3.13 flexible joint joint providing significant angular deflection and movement parallel and/or perpendicular to the pipe axis ISO 2531:2009, definition
31、3.12 3.14 push-in flexible joint flexible joint assembled by pushing the spigot through the gasket into the socket of the mating component ISO 2531:2009, definition 3.23 ISO 7186:2011(E) 4 ISO 2011 All rights reserved3.15 mechanical flexible joint flexible joint in which sealing is obtained by apply
32、ing pressure to the gasket by mechanical means, e.g. a gland ISO 2531:2009, definition 3.18 3.16 restrained joint joint in which a means is provided to prevent separation of the assembled joint ISO 2531:2009, definition 3.24 3.17 flanged joint joint between two flanged ends ISO 2531:2009, definition
33、 3.11 3.18 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 indirectly related to the physical size, in millimetres, of the bore or outside
34、diameter of the end connections. NOTE 2 Adapted from ISO 6708:1995, definition 2.1. 3.19 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 the same PN number have compatible m
35、ating dimensions. NOTE 2 Adapted from ISO 7268. 3.20 leaktightness test pressure pressure applied to a component during manufacturing in order to ensure its leaktightness 3.21 allowable operating pressure PFA maximum internal pressure, excluding surge, that a component can safely withstand in perman
36、ent service ISO 2531:2009, definition 3.2 3.22 allowable maximum operating pressure PMA maximum internal pressure, including surge, which a component can safely withstand in service NOTE Adapted from ISO 2531:2009, definition 3.17. ISO 7186:2011(E) ISO 2011 All rights reserved 53.23 allowable site t
37、est pressure PEA maximum hydrostatic pressure that a newly installed component 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
38、from the system test pressure which is related to the design pressure of the pipeline. ISO 2531:2009, definition 3.3 3.24 diametral stiffness of a pipe characteristic of a pipe allowing it to resist diametral deflection under loading ISO 2531:2009, definition 3.7 3.25 discharge system system of pipe
39、s, fittings, accessories and joints used to collect and drain waste water and rainwater from a building NOTE It comprises discharge pipes, stack ventilation pipes and rainwater downpipes, installed within the limits of a building or attached to the building. 3.26 drain system of pipes, fittings, acc
40、essories and joints installed outside the limits of a building in order to connect the discharge system of the building to a sewer or a septic tank 3.27 sewer pipeline designed to collect waste water and rainwater from buildings and surface water and to convey them to the point of disposal or treatm
41、ent 3.28 gravity sewer sewer operating normally under free flowing conditions 3.29 pumping sewer pressure sewer sewer (or section of a sewer) operating under positive pressure 3.30 vacuum sewer sewer operating under negative pressure 3.31 combined sewer sewer collecting together rainwater, surface w
42、ater and waste water 3.32 separate sewer system sewerage system which collects waste water separately from surface water ISO 7186:2011(E) 6 ISO 2011 All rights reserved3.33 batch quantity of castings from which a sample may be taken for testing purposes during manufacture ISO 2531:2009, definition 3
43、.4 3.34 type test proof-of-design test, which is done once and is repeated only after change of design ISO 2531:2009, definition 3.29 3.35 laying length L elength by which a pipeline progresses when an additional pipe is installed NOTE 1 For socket and spigot pipes, it is equal to the total length o
44、f the pipe, L tot , minus the maximum spigot insertion depth, L i , as given by the manufacturer and as shown in Figure 5. For flanged pipes, it is equal to the total length of the pipe. NOTE 2 It is expressed in metres. NOTE 3 Adapted from ISO 2531:2009, definition 3.16. 3.36 standardized length le
45、ngth of pipe barrel and fitting body or branch NOTE 1 For socket and spigot pipes, it is designated L u( l ufor branches). For flanged pipes, and fittings, it is designated L (l for branches). See Figure 5 and ISO 2531. NOTE 2 For flanged pipes and fittings, the standardized length L (l for branches
46、) is equal to the total length. For socketed pipes and fittings, the standardized length L u(l ufor branches) is equal to the total length minus the depth of socket, as indicated in the manufacturers handbooks. NOTE 3 Adapted from ISO 2531:2009, definition 3.28 3.37 ovality out-of-roundness of a pip
47、e section, equal to Equation (1): () () + A A A A 12 12 100 (1) where A 1is the maximum axis, in millimetres; A 2is the minimum axis, in millimetres. ISO 2531:2009, definition 3.21 ISO 7186:2011(E) ISO 2011 All rights reserved 73.38 deviation amount by which the design length may differ from the sta
48、ndardized length of a pipe or a fitting NOTE 1 Pipes and fittings are designed to a length selected in the range of standard length plus or minus the deviation (see Table 3); they are manufactured to this length plus or minus the tolerance given in Table 4. NOTE 2 Adapted from ISO 2531:2009, definit
49、ion 3.6. 3.39 component any product defined as an element of a pipeline, such as a pipe, fitting or accessory ISO 2531:2009, definition 3.5 See 3.2, 3.3 and 3.4. 3.40 hoop stress stress in a pipe or fitting under pressure, acting tangentially to the perimeter of a transverse section ISO 2531:2009, definition 3.14 4 Technical requirements 4.1 General 4.1.1 Pipes, fittings and accessories Thicknesses, lengths and coatings are specified in 4.3.2, 4.3.3, and 4.5 and
