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ISO. Sixth edition. Ductile iron pipes, fittings, accessories Details of the software products used to create this PDF file can be found in the. ISO specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints for the construction of pipelines. ISO Ductile iron pipes, fittings, accessories and their joints for water applications ISO Pipe components -- Definition of nominal pressure .

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Iso 2531 Pdf

ISO A new era begins. Ductile iron pipes, fittings and accessories. Water supply and distribution. New standard ISO - October ISO (E). INTERNATIONAL. STANDARD. ISO. Fifth edition. Ductile iron pipes, fittings, Wilt u deze norm in PDF-formaat?. INTERNATIONAL STANDARD ISO Sixth edition Ductile iron pipes, fittings, 2 PDF disclaimer This PDF file may contain embedded typefaces.

Quinta edicin. Tubos, racores y accesorios de fundicin dctil y sus empalmes para agua o gas. Duct iron pipes, fittings, accessories.. Luleh Va Machinsazi Iran Co. With more than 50 years experience in manufacturing and improving. DN Ductile Iron Pipes. DN ISO

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, governmental and non-governmental, in liaison with ISO, also take part in the work. 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.

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.

This sixth edition cancels and replaces the fifth edition ISO A new classification system for pipes and fittings based on pressure is introduced with minimum wall thickness determined by allowable operating pressure. This International Standard specifies materials, 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 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 inclusive. It is applicable 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 operating pressure. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. Cast iron flanges 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE The term accessory is not relevant for valves or hydrants of any type. This test pressure is different from the system test pressure, which is related to the design pressure of the 3.

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 around the barrel axis before jointing flanged joint joint between two flanged ends 3.

For flanged pipes, it is equal to the total length of the pipe. NOTE 2 It is expressed in metres maximum allowable operating pressure PMA maximum internal pressure, including surge, which a component can safely withstand in service 3.

ISO All rights reserved 3. NOTE 2 Adapted from ISO 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 diameter of the end connections.

For flanged pipes, and fittings, it is designated L l for branches. See Figures 4 to NOTE 2 For flanged pipes and fittings, the standardized length L l for branches is equal to the total length. For socketed pipes and fittings, the standardized length L u l u for branches is equal to the total length minus the spigot insertion depth, as indicated in the manufacturer s catalogues type test proof-of-design test, which is done once and is repeated only after change of design 4 Technical requirements 4.

This includes pipe and fittings manufactured to national standards and regulations. The standard nominal sizes, DN, of pipes and fittings are the following: NOTE When installed and operated under the conditions for which they are designed see Annexes A and B , ductile iron pipes, fittings, accessories and their joints maintain all their functional characteristics over their operating life, due to constant material properties, to the stability of their cross-section and to their design with high safety factors Surface condition and repairs Pipes, fittings and accessories shall be free from defects and surface imperfections which could impair their compliance with the requirements of Clauses 4 and 5.

When necessary, pipes and fittings may be repaired, for example by welding, to remove surface imperfections and localized defects which do not affect the entire wall thickness, provided that the repaired pipes and fittings comply with all the requirements of Clauses 4 and 5.

ISO All rights reserved 5. Rubber gasket materials shall conform to the requirements of ISO for water applications. When materials other than rubber are necessary e. Where washers are required, they shall comply with ISO In addition, each type of flange joint shall be designed to meet the performance requirements of 5.

Although it does not affect interconnection, the manufacturer shall indicate in his handbook whether his products are normally delivered with fixed flanges or loose flanges Flexible joints Pipes and fittings with flexible joints shall be in accordance with for their spigot external diameters, DE, and their tolerances.

This provides the possibility of interconnection between components equipped with different types of flexible joints. In addition, each type of flexible joint shall be designed to meet the performance requirements of 5.

For interconnection with certain types of joints operating within a tighter tolerance range on DE, the manufacturer s guidance should be followed as to the means of ensuring adequate joint performance up to the highest pressures e. For interconnection with existing pipelines which can have external diameters not in accordance with , the manufacturer s guidance should be followed as to the appropriate means of interconnection e.

Ductile iron pipeline systems, including pipes, fittings, accessories and joints, consist of various materials.

When used for conveying water intended for human consumption, the materials in contact with the water shall meet the relevant requirements of the national standards or regulations in the country of use with respect to effect on water quality. Components with flanged joints shall be classified by the PN number of the flange.

Allowable component pressure relationships shall be the following: Other pressure classes are allowable, including C20, C50, C64 and C Nominal size Table 3 Allowable pressures for socketed fittings Allowable operating pressure Maximum allowable operating pressure Allowable site test pressure DN PFA PMA PEA bar bar bar 40 to to to to to Appropriate limitations shall be taken into account, which can prevent the full range of these pressures being used in an installed pipeline.

For example, operation at the PFA values can be limited by the lower pressure capability of other pipeline components, e. The negative tolerance depends on the design of each type of joint and shall be as specified in national standards, or, when not so specified, in manufacturers handbooks, for the type of joint and the nominal size considered.

In addition, the ovality see 3. The manufacturer s recommendations should be followed with respect to the necessity and means of ovality correction; certain types of flexible joints can accept the maximum ovality without the need for spigot re-rounding prior to jointing Internal diameter The nominal values of the internal diameters of centrifugally cast pipes, expressed in millimetres, are approximately equal to the numbers indicating their nominal sizes, DN.

For pipes not centrifugally cast, the minimum wall thickness, e min, shall not be less than 4,7 mm. For centrifugally cast pipes, nominal pipe wall thicknesses for preferred ductile iron pressure classes are given in Table For other pressure classes, as given in Annex C, the user should confirm the availability with the manufacturer Flanged pipes Flanged pipe shall be classified by PN number.

The pressure class of the barrel of the flanged pipes shall be equal to or greater than a value in bar equal to the PN of the flanges. The pressure class of the flanged pipe barrel to be used for fabricated flanged pipe shall be as indicated in 8.

NOTE Pipe threads are regarded as loss of wall thickness Fittings Nominal wall thicknesses, e nom, are given for fittings in Tables 15 to 29, with allowable pressures given in The minimum wall thickness, e min, for fittings is: Fittings with other pressure classifications are allowed.

The manufacturer shall be responsible for the design of the fittings including the determination of wall thickness. The minimum wall thickness, e min, shall be not less than 3,0 mm. The design shall be carried out by a calculation method, e.

ISO All rights reserved 9. Table 4 Standardized lengths of socket and spigot pipe Dimensions in metres DN Standardized lengths, L a u 40 and to or 5 or 5,5 or 6 or and or 5,5 or 6 or 7 or to or 5 or 5,5 or 6 or 7 or 8,15 or 9 NOTE Not all the standardized lengths are available in all countries.

The actual length, L u, shall be measured according to and shall not differ from the manufacturer s design length by more than the tolerance given in Table 7. NOTE 2 When pipes are ordered on a meterage basis, the manufacturer can determine the required quantity of pipes to be supplied by the summation of the measured individual pipe laying lengths Flanged pipes The lengths of flanged pipes shall be as given in Table 5.

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Other lengths are available by agreement between the manufacturer and the downloadr. Table 5 Standardized lengths of flanged pipe Dimensions in metres Type of pipe DN Standardized lengths, L a With cast-on flanges 40 to ,5 or 1 or 2 or 3 or 4 40 to or 3 or 4 or 5 With screwed-on or welded-on flanges to or 3 or 4 or 5 or to or 5 or 6 or 7 a See Fittings Fittings shall be supplied in the lengths given in 8.

The verification of this requirement is normally carried out by visual inspection, but in case of doubt or in dispute, the deviation shall be measured in accordance with Material characteristics Tensile properties Pipes, fittings and accessories made of ductile iron shall have the tensile properties given in Table 8. ISO All rights reserved It shall be not less than: In case of dispute, the hardness shall be measured according to 6.

The Brinell hardness shall not exceed HBW for centrifugally cast pipes and HBW for non-centrifugally cast pipes, fittings and accessories. New standard ISO - October ISO specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints for the construction of pipelines ISO Ductile iron pipes, fittings, accessories and their joints for water applications. ISO Pipe components -- Definition of nominal pressure.. Joint Type. Pipes are joined by socket spigot arrangement where sockets are Push on T-Tyton joint type that..

Printed Edition; Ships.. ISO E. Fifth edition. Ductile iron pipes, fittings,.. Yannes Lesnussa. Wilfredo Guerrero. Smeb Polt. Kanniappan Raman Kannan.

ISO_2531_2009_Cor_1_2010(E)

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