1、 Reference number ISO 6993-2:2006(E) ISO 2006INTERNATIONAL STANDARD ISO 6993-2 First edition 2006-06-01 Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa) Systmes de canalisations ent
2、erres en poly(chlorure de vinyle) rsistance au choc amliore (PVC-HI) pour rseaux de combustibles gazeux Partie 2: Raccords pour une pression maximale de service de 200 mbar (20 kPa) ISO 6993-2:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing po
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5、 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. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced o
6、r 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 postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 1
7、1 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedISO 6993-2:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms, definitions, symbols and abbreviated terms. 2 4 Materi
8、al 2 5 General characteristics of fittings. 3 6 Geometrical characteristics. 3 7 Physical characteristics. 7 8 Mechanical characteristics 8 9 General requirements for fittings 9 10 Performance requirements 9 11 Test methods. 11 12 Marking 11 Annex A (normative) Determination of resistance to gas con
9、stituents . 12 Annex B (normative) Determination of leaktightness of fitting joints by internal air pressure, with and without mechanical loading. 14 Annex C (normative) Determination of leaktightness of fitting joints under negative pressure and mechanical loading. 16 Bibliography . 18 ISO 6993-2:2
10、006(E) iv ISO 2006 All rights reservedForeword ISO (the International Organization for Standardization) 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
11、 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. ISO collaborates closely with the International Electrotec
12、hnical 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 main task of technical committees is to prepare International Standards. Draft International Standards adopted by
13、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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
14、ts. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6993-2 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. This first
15、edition of ISO 6993-2, together with ISO 6993-1, ISO 6993-3 and ISO 6993-4, cancels and replaces ISO 6993:2001, of which it constitutes a technical revision. ISO 6993 consists of the following parts, under the general title Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the sup
16、ply of gaseous fuels: Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa) Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa) Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa) Part 4: Code of practice for design, handling and installati
17、on INTERNATIONAL STANDARD ISO 6993-2:2006(E) ISO 2006 All rights reserved 1 Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa) 1 Scope This part of ISO 6993 gives the requirements for
18、 non-end load-bearing fittings made of high-impact poly(vinyl chloride) (PVC-HI) intended to be used for the supply of gaseous fuels through buried pipelines having an operating temperature range of 0 C up to and including +30 C and a maximum operating pressure of 200 mbar (20 kPa) 1) . It is applic
19、able only to fittings manufactured from the high-impact PVC materials PVC-A, PVC-CPE and PVC-EPR and having joints with elastomeric sealing elements. The fittings are suitable for those gases not containing potentially damaging components in such concentrations as to impair the properties of the fit
20、ting material. 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 580:200
21、5, Plastics piping and ducting systems Injection-moulded thermoplastics fittings Methods for visually assessing the effects of heating ISO 2507-1, Thermoplastics pipes and fittings Vicat softening temperature Part 1: General test method ISO 2507-2, Thermoplastics pipes and fittings Vicat softening t
22、emperature Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and for high impact resistance poly(vinyl chloride) (PVC-HI) pipes ISO 3126, Plastics piping systems Plastics components Determination of dimensions ISO 31
23、27, Thermoplastics pipes Determination of resistance to external blows Round-the-clock method ISO 6993-1, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa) ISO 9080, Plastics piping and d
24、ucting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation EN 682:2002, Elastomeric seals Material requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 922:1994, Plastics piping and ducting systems
25、Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) Specimen preparation for determination of the viscosity number and calculation of the K-value 1) 1 bar = 0,1 MPa = 10 5 Pa; 1 MPa = 1 N/mm 2ISO 6993-2:2006(E) 2 ISO 2006 All rights reserved3 Terms, definitions, symbols and abbreviated
26、terms For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 6993-1 and the following terms, definitions and symbols apply. 3.1 Terms and definitions 3.1.1 fitting component, other than a pipe, used in a pipeline EXAMPLE Bend, tee, coupler, end cap. 3.1
27、.2 joint connection between the ends of two components (with smooth spigot-ends and/or sockets) NOTE In this part of ISO 6993, only joints with elastomeric sealing elements are considered. 3.1.3 socket end of the fitting in which the elastomeric sealing element is fixed and into which a smooth spigo
28、t-end can be inserted 3.2 Symbols d depth/total depth of cracks, delaminations, blisters, or open yield seam, as applicable d im mean inside diameter of socket-end e 1 ,e 2 ,e 3 , e 4minimum wall thicknesses of fitting T sdepth of engagement L crack/blister length L maxmaximum length of depth of eng
29、agement of socket L minminimum length of spigot-end 4 Material 4.1 Material for fittings 4.1.1 Composition The fittings shall be made of high-impact PVC, to which only such additives are added that are necessary to facilitate conformity of the components to this part of ISO 6993. The impact-resistan
30、t modified PVC shall be one of the following compositions: a) a mixture based on PVC; b) a blend based on PVC; c) a copolymer based on PVC; d) a combination of these types. The proportion of the impact modifier in the composition shall be at least 7 % by mass. ISO 6993-2:2006(E) ISO 2006 All rights
31、reserved 3 4.1.2 Long-term strength The MRS value of the injection-moulding material shall be at least 14 MPa. Conformity to this requirement shall be proven using a long-term evaluation in accordance with ISO 9080. Testing is to be carried out at 20 C, 40 C and 60 C, for periods up to 10 000 h. At
32、60 C no knee shall occur before 5 000 h. For injection-moulding compounds, this test shall be carried out on test pieces in the form of an injection moulded or extruded sample in solid wall pipe form made from the relevant injection-moulding material. NOTE The MRS evaluation is used for a material q
33、ualification and is not intended to be used for a pressure rating. 4.1.3 Vicat softening temperature The Vicat softening temperature of the injection-moulding material shall be not less than 74 C when determined in accordance with ISO 2507-1 and ISO 2507-2. 4.1.4 K-value The K-value of the unplastic
34、ized polyvinyl chloride (PVC-U) resin in the injection-moulding material shall exceed 57, when measured in accordance with EN 922. 4.2 Material for elastomeric sealing elements The material of the elastomeric sealing elements shall conform to EN 682:2002, type G. The elastomeric sealing element shal
35、l have no detrimental effects on the properties of the components. 5 General characteristics of fittings 5.1 Contaminants The material of the fitting shall not be shown to contain any contaminants, such as inorganic particles or agglomerations thereof, exceeding 50 m in size, when measured in accord
36、ance with 11.1 and 11.2. 5.2 Appearance and finish The appearance and finish of the fittings shall be examined visually without magnification. Internal and external surfaces shall be free from grooves, pits, blisters, indications of burning, an unacceptable form of cold-flow and other irregularities
37、 that could have a detrimental effect on the mechanical properties of the material and/or on the functional quality of the component. Transitions in the form shall be smooth, in order to avoid notch influence. The corners in the grooves, in particular for the fixing of the elastomeric sealing elemen
38、ts, shall be rounded. 6 Geometrical characteristics 6.1 Measurements All dimensions shall be measured in accordance with ISO 3126. ISO 6993-2:2006(E) 4 ISO 2006 All rights reserved6.2 Fittings 6.2.1 Fittings with socket-ends 6.2.1.1 Mean inside diameter of socket-end The mean inside diameter of the
39、socket-end, d im , shall be in accordance with Table 1. Table 1 Minimum values of mean inside diameter of socket-end Mean inside diameter of socket-end d imNominal outside diameter of connecting pipe d nMinimum mm 50 50,4 63 63,4 75 75,5 90 90,5 110 110,6 125 125,6 140 140,7 160 160,7 180 180,8 200
40、200,8 225 225,9 250 251,0 280 281,1 315 316,3 355 356,3 400 401,3 6.2.1.2 Out-of-roundness of socket-end The difference between the greatest and the smallest measured inside diameter in the socket-end shall be, in any cross-section, not greater than 0,007 d n , where d nis the nominal outside diamet
41、er of the connecting pipe, expressed in millimetres. The calculated value shall be rounded off to the next higher 0,1 mm. 6.2.1.3 Height of stop shoulder or dead stop At installation or at maximum allowable angular deflection, fittings with a stop shoulder or dead stop shall not allow any further pu
42、shing of the connecting pipe. The minimum and maximum inside diameter of the socket at the stop shoulder or dead stop shall not be less than the values according to Table 2. ISO 6993-2:2006(E) ISO 2006 All rights reserved 5 Table 2 Mean inside diameter of socket at stop shoulder or dead stop Dimensi
43、ons in millimetres Mean inside diameter of socket at stop shoulder or dead stop Nominal outside diameter of connecting pipe d nMinimum Maximum 50 45,2 47,2 63 56,9 60,2 75 67,8 72,3 90 81,3 87,0 110 99,4 106,3 125 112,9 120,7 140 126,4 135,3 160 144,5 154,5 200 180,6 193,2 225 203,2 217,4 250 225,8
44、241,5 280 252,7 270,5 315 284,5 304,4 355 320,5 342,9 400 361,0 386,3 6.2.1.4 Wall thickness and depth of engagement The minimum wall thickness, and the depth of engagement, T s , as shown in Figure 1, shall be in accordance with Table 3. The lengths, L minand L max , as shown in Figure 1, shall be
45、less than or equal to the values according to Table 3. 6.2.2 Fittings with smooth spigot-ends The lengths, L minand L max , as shown in Figure 1, shall be greater than or equal to the values according to Table 3. The minimum wall thicknesses, e 1 , e 2 , e 3and e 4 , of a fitting fabricated from pip
46、e or of an injection moulded fitting shall be in accordance with Table 3. The dimensions of fittings with a spigot-end shall be in accordance with the requirements of 6.2 for connecting pipes, over a length L min(see Table 3 and Figure 1). ISO 6993-2:2006(E) 6 ISO 2006 All rights reservedFigure 1 Di
47、mensions of fittings (see Table 3) Table 3 Wall thickness and depth of engagement of fittings Dimensions in millimetres Fittings fabricated from pipes Injection moulded fittings T sL maxMinimum wall thickness d ne 1 ,e 2 , e 3e 4e 1 ,e 2 , e 3e 4Minimum L min50 2,0 1,5 2,5 2,0 38 89 63 2,0 1,5 2,5 2
48、,0 40 96 75 2,0 1,5 2,9 2,3 42 102 90 2,2 1,7 3,5 2,8 44 108 110 2,7 2,1 4,3 3,4 47 115 125 3,1 2,4 4,9 3,9 49 123 140 3,5 2,6 5,4 4,3 52 127 160 3,9 3,0 6,2 4,9 54 131 180 4,4 3,3 6,9 5,5 57 136 200 4,9 3,7 7,8 6,2 60 143 225 5,5 4,1 8,6 6,9 64 154 250 6,1 4,6 9,7 7,7 68 166 280 6,9 5,2 10,7 8,6 73
49、 175 315 7,7 5,8 12,2 9,7 78 184 355 8,7 6,6 13,7 10,9 84 200 400 9,8 7,4 15,4 12,3 90 210 L maxis the maximum length of the depth of engagement of the socket. L minis the minimum length for the spigot-end. ISO 6993-2:2006(E) ISO 2006 All rights reserved 7 6.2.3 Bends with smooth spigot-ends The following requirements are in addition to those of 6.2.2: for fabricated bends from pipe, the deviation from the declared angle shall not be more than 3 . for injection moulded be
