1、 Reference number ISO 6993-3:2006(E) ISO 2006INTERNATIONAL STANDARD ISO 6993-3 First edition 2006-06-01 Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa) Systmes de canalis
2、ations enterres en poly(chlorure de vinyle) rsistance au choc amliore (PVC-HI) pour rseaux de combustibles gazeux Partie 3: Raccords et colliers pour une pression maximale de service de 1 bar (100 kPa) ISO 6993-3:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with
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5、 care has been taken 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
6、 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 postale 56 CH-1211 Geneva 20 T
7、el. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedISO 6993-3:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms, definitions, symbols and abbreviat
8、ed terms. 2 4 Material 5 5 General characteristics of fittings/saddles 6 6 Geometrical characteristics. 6 7 Physical characteristics. 7 8 Mechanical characteristics 8 9 Saddle design and construction . 9 10 Performance requirements 10 11 Test methods. 11 12 Marking 11 Annex A (normative) Determinati
9、on of resistance to external blows at 0 C for fittings 13 Annex B (normative) Determination of resistance to external blows at 0 C for saddles 15 Annex C (normative) Determination of tensile resistance of in-line fitting assemblies . 18 Annex D (normative) Determination of leaktightness of saddle jo
10、ints by internal air pressure, with and without mechanical loading. 19 Annex E (normative) Determination of leaktightness of saddle joints under negative pressure and mechanical loading. 21 Annex F (normative) Determination of leaktightness under constant load and by tensile testing at constant spee
11、d of lateral connections (end-load resistant joints of tapping saddles with PE service pipe lines). 23 Bibliography . 25 ISO 6993-3:2006(E) iv ISO 2006 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO mem
12、ber 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 right to be represented on that committee. International organizations, governmen
13、tal 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Direc
14、tives, 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 an International Standard requires approval by at least 75 % of the member bodi
15、es 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 6993-3 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fitting
16、s and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. This first edition of ISO 6993-3, together with ISO 6993-1, ISO 6993-2 and ISO 6993-4, cancels and replaces ISO 6993:2001, of which it constitutes a technical revision. ISO 6993
17、consists of the following parts, under the general title 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) Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa) Part 3:
18、Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa) Part 4: Code of practice for design, handling and installation INTERNATIONAL STANDARD ISO 6993-3:2006(E) ISO 2006 All rights reserved 1 Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
19、fuels Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa) 1 Scope This part of ISO 6993 gives the requirements for full-end load-resistant fittings and saddles made of high-impact poly(vinyl chloride) (PVC-HI) intended to be used for the supply of gaseous fuels through b
20、uried pipelines having an operating temperature range of 0 C up to and including +30 C and a maximum operating pressure of 1 bar (100 kPa) 1) . It is applicable only to fittings and saddles manufactured from the high-impact PVC materials PVC-A, PVC-CPE and PVC-EPR. It is applicable to joints with el
21、astomeric sealing elements and of the solvent cement type. The fittings and saddles are suitable for those gases not containing potentially damaging components in such concentrations as to impair the properties of the fitting/saddle material. 2 Normative references The following referenced documents
22、 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 580:2005, Plastics piping and ducting systems Injection-moulded thermoplastics
23、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 temperature Part 2: Test conditions for unplasticized poly(vinyl chloride
24、) (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 3127, Thermoplastics pipes Determination of resistance to external blows R
25、ound-the-clock method ISO 4422-3:1996, Pipes and fittings made of unplasticized poly(vinyl chloride) (PVC-U) for water supply Specifications Part 3: Fittings and joints ISO 6993-1:2006, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels Part 1: Pipes for
26、 a maximum operating pressure of 1 bar (100 kPa) 1) 1 bar = 0,1 MPa = 10 5 Pa; 1 MPa = 1 N/mm 2ISO 6993-3:2006(E) 2 ISO 2006 All rights reservedISO 9080, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation
27、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 Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) Specimen preparation for determination of the viscosity numb
28、er and calculation of the K-value 3 Terms, definitions, symbols and abbreviated 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
29、, other than a pipe, used in a pipeline EXAMPLE Bend, tee, coupler, end cap. 3.1.2 joint connection between the ends of two components (with smooth spigot-ends and/or sockets) NOTE In this part of ISO 6993, only solvent weld joints are considered. 3.1.3 socket end of the fitting into which a smooth
30、spigot-end can be inserted and joined by the solvent weld process 3.1.4 tapping saddle component, including the necessary parts such as wedges and connector, used to make branches from a main pipeline to a service pipeline of polyethylene (PE) with a maximum d nof 63 See Figure 1. ISO 6993-3:2006(E)
31、 ISO 2006 All rights reserved 3Key 1 cap 5 wedge 2 end trust joint 6 lower saddle half 3 upper saddle half 7 tapping tee 4 clamp Figure 1 Tapping saddle 3.1.5 bag stopper saddle component, including the necessary parts such as wedges and balloon entry equipment, used to introduce a balloon into a pi
32、peline in order to temporarily interrupt the gas flow See Figure 2. ISO 6993-3:2006(E) 4 ISO 2006 All rights reservedFigure 2 Bag stopper saddle 3.2 Symbols d depth/total depth of cracks, delaminations, blisters, or open yield seam, as applicable L crack/blister length l key-way length ISO 6993-3:20
33、06(E) ISO 2006 All rights reserved 5 4 Material 4.1 Material for fittings/saddles 4.1.1 Composition The fittings and saddles 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-res
34、istant 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. 4.1.2 Long-term strength The MRS v
35、alue 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 60 C no knee shall occur before 5 000 h. For
36、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 qualification and is not intended to be used f
37、or 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 unplasticized polyvinyl chloride (PVC-U) resin in the
38、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 shall have no detrimental effects on the properti
39、es of the components. ISO 6993-3:2006(E) 6 ISO 2006 All rights reserved5 General characteristics of fittings/saddles 5.1 Contaminants The material of the fitting or saddle shall not be shown to contain any contaminants, such as inorganic particles or agglomerations thereof, exceeding 50 m in size, w
40、hen measured in accordance with 11.1 and 11.2. 5.2 Appearance and finish The appearance and finish of the fitting/saddle 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-f
41、low and other irregularities 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 th
42、e elastomeric sealing elements, shall be rounded. 6 Geometrical characteristics 6.1 Measurements All dimensions shall be measured in accordance with ISO 3126. 6.2 Fittings 6.2.1 Spigot ends on moulded fittings The dimensions of spigot ends on moulded fittings shall meet the outside diameter requirem
43、ents of ISO 6993-1:2006, Table 1. 6.2.2 Sockets on moulded fittings The geometrical characteristics of fittings for solvent cementing shall be in accordance with ISO 4422-3:1996, 6.1. 6.3 Saddles 6.3.1 General The dimensions and the admissible tolerances of the saddles shall be in accordance with th
44、e values declared by the manufacturer. 6.3.2 Wall thickness and cross-section area The wall thickness and the cross-section area of those parts of the saddles subject to tangential stresses due to the clamp force of the pipe shall be in accordance with Table 1, for every cross section perpendicular
45、to the direction of the stress. ISO 6993-3:2006(E) ISO 2006 All rights reserved 7 Table 1 Wall thickness and cross-section area of saddles Saddle Nominal outside diameter of main pipe d nMinimum wall thickness mm Minimum cross-section area mm 250 4,3 300 63 4,3 325 75 4,3 325 90 4,8 360 110 5,1 450
46、125 5,5 450 140 5,7 500 160 6,0 560 180 6,4 600 200 6,8 650 225 7,4 800 250 8,1 950 280 8,7 1 025 315 9,4 1 100 355 10,1 1 200 400 11,0 1 300 7 Physical characteristics When tested in accordance with 11.1 and 11.3 at 150 C (oven test), injection moulded fittings and saddles shall meet the following
47、requirements (see Figures 3 and 4). The depth, d, of all cracks, delaminations or blisters occurring within a distance of 1,5 times the wall thickness measured at the injection point, with a minimum of 20 mm, shall not be greater then 30 % of the wall thickness at that point. For diaphragm-gated inj
48、ection moulded fittings or saddles, the depth, d, of all cracks, delaminations or blisters occurring within a distance of 1,0 times the wall thickness of the diaphragm zone shall not be greater than 30 % of the wall thickness at that point. For ring-injected fittings or saddles, the depth, d, of all
49、 cracks, delaminations or blisters occurring within a distance of 1,0 times the wall thickness at the ring gate zone shall not be greater than 30 % of the wall thickness at that point. For fittings or saddles with a yield seam, the total depth, d, of the opened yield seam shall not be greater than 10 % of the wall thickness at that point. For all other parts of the surface outside the injection zone, the total depth, d, of cracks or delaminations shall not be greater than 1
