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1、INTERNATIONAL STANDARD IS0 10804-I First edition 1996-12-15 Restrained joint systems for ductile iron pipelines - Part 1: Design rules and type testing Assemblages verrouill a=400net; p=iso; o=isocs; s=central Printed in Switzerland Copyright International Organization for Standardization Provided b
2、y IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 10804-1:1996(E) Restrained joint systems for ductile iron pipelines - Part 1: Des
3、ign rules and type testing 1 Scope This part of IS0 10804 specifies design rules and type testing for restrained joint systems to be used on ductile iron pipelines complying with IS0 2531 and IS0 7186, in order to determine their mechanical properties and leaktightness. 2 Normative references The fo
4、llowing standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 10804. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 10804 are encouraged
5、to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 2531 : 1991, Ductile iron pipes, fittings, and accessories for pressure pipelines. IS0 6708 : 1995, Pipework
6、 components - Definition and selection of DN (nominal size). IS0 7186 : 1996, Ductile iron products for sewerage applications. 3 Definitions For the purposes of this part of IS0 10804 the definitions given in IS0 6708 and the following definitions apply : 3.1 restrained joint : Joint in which a mean
7、s is provided to prevent separation of the assembled joint. 3.2 allowable operating pressure : Internal pressure, excluding surge, that a component can safely withstand in permanent service. 3.3 maximum allowable operating pressure : Maximum internal pressure, including surge, that a component can s
8、afely withstand in service. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 10804-l :1996(E
9、) 0 IS0 3.4 allowable test pressure : Maximum internal hydrostatic pressure which can be applied on site to a component in a newly installed pipeline. NOTE - This test pressure is different from the system test pressure, which is related to the design pressure of the pipeline and is intended to ensu
10、re its integrity and leaktightness. 3.5 allowable bending moment : Bending moment that a joint between two components can safely withstand in service under the allowable operating pressure. 3.6 type test : Proof of design test which is done once, and is repeated only after change of design. 3.7 allo
11、wable angular deflection : Angular deflection that a joint between two components can safely withstand in service under the allowable operating pressure. 4 Design rules 4.1 All restrained joints for ductile iron pipes, fittings and other components shall be designed with the requirements of this cla
12、use. If the design of a restrained joint has been tested and successfully used for a minimum of ten years, a type test as described in clause 5 is only required for a significant change in the design which could adversely affect the performance of the restrained joint. 4.2 The design safety factors
13、with respect to failure against axial forces due to internal pressure shall be such that the joints can withstand a type test pressure of 1,5 times allowable operating pressure plus 5 bar l). 4.3 Alternatively, for those restrained joints which are rigid enough to be subjected to a bending moment th
14、e design safety factor with respect to failure against the combined effects of axial forces and a bending moment shall be at least 2 at the allowable operating pressure and allowable bending moment. 4.4 Ductile iron pipelines and the restrained joints as defined in this part of IS0 10804 are well su
15、ited for use in seismic zones. However, certain locations, such as fault crossings, liquefaction zones, connections to structures, etc., require specialized designs. The pipe manufacturer or a competent earthquake engineer should be consulted. 4.5 For joint restraint components, the protection again
16、st aggressive soils shall be at least as good as that of the pipes and/or fittings. It may be achieved by means of works applied coatings and/or site applied protection systems. 11 bar=10sN/m2=105Pa=0,1MPa 2 Copyright International Organization for Standardization Provided by IHS under license with
17、ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 IS0 10804-l :1996(E) 5 Type testing 5.1 General Each restrained joint design shall be tested in order to demonstrate its mechanical str
18、ength and its water-tightness under the most unfavourable conditions of castings tolerances and joint movements. 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). In addition, the
19、 spigot thickness shall be the minimum casting thickness +lE % . NOTE - When the failure mode justifies it, the type tests are also carried out in the configuration of minimum design radial gap. In the type tests, the maximum gap shall not be less than the corresponding maximum design radial gap by
20、more than 5 % or 0,5 mm (whichever is the smaller). The internal socket diameter may be machined to achieve this. 5.2 Test conditions There shall be a type test for at least one DN for each of the groupings given in table 1, normally using the preferred DN. One DN is representative of a grouping whe
21、n the performances are based on the same design parameters throughout the size range. Table 1 DN groupings Preferred DN in each grouping 40 to 250 300 to 600 700 to 1000 1100 to 2000 2000 200 400 800 1600 2400 If a grouping covers products of different designs and/or products manufactured by differe
22、nt processes, the grouping shall be subdivided. If, for a certain manufacturer, a grouping contains only one DN, this DN may be considered as part of the adjacent grouping provided that it is of identical design and manufactured by the same process. Each diameter tested shall be subjected to the fol
23、lowing conditions : a) joint assembled in the aligned position, then deflected to the allowable angular deflection indicated in the manufacturers instructions, and tested while maintained in the deflected position ; b) joint assembled in the aligned position, then subjected to a load giving a result
24、ant shear force across the joint not less than 50 x DN (expressed in newtons), and tested under shear. All joint assemblies shall exhibit no visible leakage and no mechanical instability after 2 h under a hydrostatic pressure as given in 4.2 or 4.3. In addition, any axial movement that may occur at
25、the joint shall reach a constant value within the 2 h. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from
26、IHS -,-,- IS0 10804-l :1996(E) Q IS0 5.3 Test method The testing apparatus shall be capable of providing suitable end closure whether the joint is in the aligned position, or deflected, or subjected to a shear load. It shall be equipped with a pressure gauge with an accuracy of * 3 %. The test shall
27、 be carried out on an assembled joint comprising two pipe sections, each at least 1 m long. For the test according to 5.2 b), the shear load shall be applied to the spigot end by means of a V-shaped block with an angle of 120”, located at approximately 0,5 x DN, in millimetres, or 200 mm from the so
28、cket face (whichever is the larger) ; the socket shall bear on a flat support. The testing assembly shall be filled with water and suitably vented. The test pressure shall be raised by steps : for example, 10 bar steps, at a rate not exceeding 1 bar/s ; the axial movement shall be measured after 5 m
29、in at each test pressure. The test pressure shall be kept constant to * 1 bar for at least 2 h during which the joint is thoroughly inspected and its axial movement measured every 15 min. At the manufacturers option the test may be continued at higher pressures. 5.4 Test report The test report shall
30、 contain the following : a) type of joint ; b) size range covered by the test ; c) DN tested ; d) class of pipe tested ; e) allowable operating pressure ; f) maximum allowable operating pressure ; g) allowable test pressure ; h) allowable angular deflection ; i) allowable bending moment (if applicab
31、le) ; j) result of test ; k) date of test. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0
32、10804-l :1996(E) 0 IS0 ICS 23.040.01 Descriptors: pipelines, cast iron products, spheroidal-graphite cast-iron, pipes (tubes), pipe joints, design, tests, type testing (tests). Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,-