Contents
  1. iso - Free Download PDF
  2. ISO_2531_2009_Cor_1_2010(E)

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 Sixth edition. Ductile iron pipes, fittings, accessories. Details of the software products used to create this PDF file can be found in the.. This sixth edition cancels and replaces the fifth edition ISO , of which it constitutes a technical revision. A new classification system for pipes and.. ISO Standard.

EN Ductile iron pipes, fittings, accessories and..

ISO A new era begins. Ductile iron pipes, fittings and accessories.

Water supply and distribution. 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. Husseinali Hussein.

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Nat Vuatalevu. Leo Gav. 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.

iso - Free Download PDF

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. 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. For components manufactured by welding, a higher Brinell hardness is allowed in the heat-affected zone of the weld.

ISO_2531_2009_Cor_1_2010(E)

These environments can be characterized according to their aggressivity. For relevant factors, see A. Coatings specified by relevant International Standards are available as specified in A. Other coatings are available Internal linings Ductile iron pipeline systems can be used to convey a wide range of raw waters and potable waters. These internal environments can be characterized by their aggressivity.

Relevant factors to be considered for cement mortar linings without seal coats are given in B. Linings specified by relevant International Standards are available as specified in B. Other linings are also available. These environments can be characterized by their aggressivity. Other coatings are also available Internal linings Ductile iron pipeline systems can be used to convey a wide range of raw waters and potable waters.

These internal environments can be characterized according to their aggressivity. ISO ; b the manufacturer s name or mark; c identification of the year of manufacture; d identification as ductile iron; e the DN; f the PN rating of flanges, if applicable; g the C pressure class of socket and spigot pipe.

Items b to f shall be cast-on or cold stamped. Items a and g can be applied by any method, e. They shall be tested according to 6. If the design has been tested and documented by the manufacturer and successfully used for a minimum of 10 years, the performance of a type test as specified in for internal pressure, as specified ISO All rights reserved Joint designs shall be type tested to demonstrate leaktightness to both internal and external pressure under the most unfavourable conditions of castings tolerances and joint movements.

There shall be a type test for at least one DN for each of the groupings given in Table 9. One DN is representative of a grouping when the performances are based on the same design parameters throughout the size range.

If, for a manufacturer, a grouping contains only one DN or PN, this DN or PN may be considered as part of the adjacent grouping provided that it is of identical design and manufactured by the same process.

The type tests shall be carried out in the configuration of maximum design radial gap between the components to be jointed smallest spigot together with largest socket.

The internal socket diameter may be machined to achieve this, even if the resulting diameter is slightly outside the normal manufacturing tolerance. It is permissible to machine the spigot of the pipe bore to achieve the required thickness. Restrained flexible joints shall be designed and tested in accordance with ISO Internal pressure The leaktightness of joints to internal pressure shall be type tested as specified in 7. The test pressure shall be not less than 2 bar.

The maximum pressure change during the test period shall not be more than 0,09 bar after 2 h, when tested in the following two positions: If the design has been tested and documented by the manufacturer and successfully used for a minimum of 10 years, the performance of a type test as specified in is only required for significant changes in design which could adversely affect the performance of the joint.

When flanges are involved, there shall be a type test for at least one DN for each of the groupings given in Table 9. The PN to be tested is the highest PN existing for each flange design. One PN is representative of a grouping when the performances are based on the same design parameters throughout the size range.

If, for a manufacturer, a grouping contains only one DN or PN, this DN or PN may be considered as part of the adjacent grouping provided that it is of identical design and manufactured by the same process Internal pressure and bending moment In order to demonstrate their strength and leaktightness in service conditions, flanged joints shall be subjected to a type test. When tested as specified in 7. A type test shall be carried out on each type of flange joint available from the manufacturer in accordance with Table

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