1、 ISO 2012 Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 3: Fittings Systmes de canalisations en matires plastiques pour la distribution de combustibles gazeux Systmes de canalisations en polyami
2、de non plastifi (PA-U) avec assemblages par soudage et assemblages mcaniques Partie 3: Raccords INTERNATIONAL STANDARD ISO 16486-3 First edition 2012-06-01 Reference number ISO 16486-3:2012(E) ISO 16486-3:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserv
3、ed. Unless otherwise specified, no part of this publication 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 requeste
4、r. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 16486-3:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3
5、 T erms, definitions, symbols and abbreviated terms 2 4 Material . 3 4.1 PA-U compound . 3 4.2 Material for non-unplasticized polyamide parts . 3 5 General characteristics 4 5.1 Appearance . 4 5.2 Design . 4 5.3 Colour . 4 5.4 Electrical characteristics for electrofusion fittings 4 5.5 Appearance of
6、 factory-made joints 4 5.6 Fusion compatibility . 4 6 Geometrical characteristics . 5 6.1 Measurement of dimensions 5 6.2 Dimensions of electrofusion sockets 5 6.3 Dimensions of spigot end fittings . 7 6.4 Dimensions of tapping tees 8 6.5 Dimensions of transition fittings to other materials 9 7 Mech
7、anical characteristics . 9 7.1 General . 9 7.2 Conditioning . 9 7.3 Requirements . 9 8 Physical characteristics 10 8.1 Conditioning .10 8.2 Requirement . 11 9 Chemical resistance of fittings in contact with chemicals 11 10 Performance requirements . 11 11 Marking . 11 11.1 General . 11 1 1.2 Minimum
8、 required marking of fittings . 11 1 1.3 Additional information required on fitting or label .12 11.4 Fusion system recognition .12 12 Packaging 12 Annex A (informative) Examples of typical terminal connections for electrofusion fittings .13 Annex B (normative) Short-term pressure test method .15 An
9、nex C (normative) T ensile test fitting/pipe assemblies .17 Bibliography .18 ISO 16486-3:2012(E) Foreword 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 car
10、ried 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.
11、 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 Directives, Part 2. The main task of technical committees is to prepare Interna
12、tional 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 bodies casting a vote. Attention is drawn to the possibility that some of the
13、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 16486-3 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pip
14、es and fittings for the supply of gaseous fuels. This first edition of ISO 16486-3 cancels and replaces the first edition of ISO 22621-3:2007 which has been technically revised. ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply of gaseous fuels
15、 Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing: Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness for purpose of the system Part 6: Code of practice for design, handling and installation iv ISO 2012 All rights reserved ISO 16486-3:2012(E) Int
16、roduction Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low pressures, while thicker wall thickness pipes and butt fusion, electrofusion or mechanical joints are typically used for high pressures. For technical and safety reasons, it is not
17、 possible to mix the components of the two types of piping system (thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particular, solvent cement joints must not be used for jointing for high pressure piping systems. So for the time being, the standard
18、ization programme dealing with unplasticized polyamide (PA-U) piping systems for the supply of gaseous fuels is split into two series of International Standards, with one series (ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and the other (ISO 16
19、486) the components of which are connected by fusion jointing and/or mechanical jointing. When more experience will be gained from the field, it might be reasonable to merge the ISO 17467 series and the ISO 16486 series in one single series applicable to PA-U piping systems. A similar series (ISO 17
20、135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems is in preparation. ISO 2012 All rights reserved v Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 3: Fittings 1
21、 Scope This part of ISO 16486 specifies the physical and mechanical properties of fittings made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels. It also specifies the test parameters for the test methods to which it r
22、efers. ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing and/or mechanical jointing. In addition, it lays down dimensional characteristics and requirements for the marking of fittings. In conjunction with the other parts of ISO 16486, it is appli
23、cable to PA-U fittings, their joints, to joints with components of PA-U and to joints with mechanical fittings of other materials, and to the following fitting types: fusion fittings electrofusion fittings and butt fusion fittings; transition fittings. 2 Normative references The following documents,
24、 in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmo
25、spheres for conditioning and testing ISO 307, Plastics Polyamides Determination of viscosity number ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167- 4, Thermoplastics pipes, fi
26、ttings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 4: Preparation of assemblies ISO 3126, Plastics piping systems Plastics components Determination of dimensions ISO 4433-1, Thermoplastics pipes Resistance to liquid chemicals Classification P
27、art 1: Immersion test method ISO 11922-1:1997, Thermoplastic pipes for the conveyance of fluids Dimensions and tolerances Part 1: Metric series ISO 13951:2001, Plastics piping systems Test method for the resistance of polyolefin pipe/pipe or pipe/fitting assemblies to tensile loading ISO 13953:2001,
28、 Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joint INTERNATIONAL STANDARD ISO 16486-3:2012(E) ISO 2012 All rights reserved 1 ISO 16486-3:2012(E) ISO 13954, Plastics pipes and fittings Peel decohesion test for polyethyle
29、ne (PE) electrofusion assemblies of nominal outside diameter greater than or equal to 90 mm ISO 13955:1997, Plastics pipes and fittings Crushing decohesion test for polyethylene (PE) electrofusion assemblies ISO 13956:2010, Plastics pipes and fittings Decohesion test of polyethylene (PE) saddle fusi
30、on joints Evaluation of ductility of fusion joint interface by tear test ISO 13957:1997, Plastics pipes and fittings Polyethylene (PE) tapping tees Test method for impact resistance ISO 16486-1:2012, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping system
31、s with fusion jointing and mechanical jointing Part 1: General ISO 16486-2, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 2: Pipes ISO 16486-5, Plastics piping systems for the supply of gaseous
32、fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 5: Fitness for purpose of the system EN 682, Elastomeric seals Materials requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids IEC 60529:2001, Degrees of protection p
33、rovided by enclosures (IP Code) 3 T erms, definitions, s ymbols and abbreviated terms For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 16486-1 and the following apply. 3.1 e l e c t ro f u si o n s o c ke t fi t t ing polyamide (PA-U) fitting whic
34、h contains one or more integral heating elements that are capable of transforming electrical energy into heat to realise a fusion joint with a spigot end and/or a pipe 3.2 e l e c t ro f u si o n sa d dl e fi t t ing unplasticized polyamide (PA-U) fitting which contains one or more integral heating
35、elements that are capable of transforming electrical energy into heat to realize fusion onto a pipe 3.3 tapping tee electrofusion saddle fitting (top loading or wraparound) which contains an integral cutter, used to cut through the wall of the main pipe, and holds the coupon inside the cutter NOTE T
36、he cutter remains in the body of the saddle after installation. 3.4 branch s addle electrofusion saddle fitting (top loading or wraparound), which requires an ancillary cutting tool for drilling the hole in the main pipe 3.5 s pigot end fi t t ing unplasticized polyamide (PA-U) fitting where the out
37、side diameter of the spigot length is equal to the nominal outside diameter, d n , of the corresponding pipe 2 ISO 2012 All rights reserved ISO 16486-3:2012(E) 3.6 mechanic al fi t t ing fitting for assembling an unplasticized polyamide (PA-U) pipe to another PA-U pipe or any other element of the pi
38、ping system NOTE 1 The mechanical fitting can be supplied for field assembly or pre-assembled by the manufacturer and generally includes a compression part to provide pressure integrity, leak-tightness and resistance to end loads. A support sleeve inserted into the pipe bore provides a permanent sup
39、port for the PA-U pipe to prevent creep in the pipe wall under radial compressive forces. NOTE 2 The metallic parts of the fitting may be assembled to metallic pipes by screw threads, compression joints, welded or flanged connections. The fitting can allow for either a dismountable or permanently as
40、sembled joint. In some cases, the supporting ring may also act as a grip ring. 3.7 voltage regulation control of energy supplied, during the fusion process of an electrofusion fitting, by means of the voltage parameter 4 Material 4.1 PA-U compound The fittings shall be made from virgin material. The
41、 compound from which the fittings are made shall be in accordance with ISO 16486-1. 4.2 Material for non-unplasticized polyamide parts 4.2.1 General The materials and constituent elements used in making the fitting shall be resistant to the external and internal environments in which they are intend
42、ed to be used a) during storage, b) under the effect of the fluids being conveyed, and c) taking account of the service environment and operating conditions. Fittings materials, including elastomers, greases and lubricants in contact with the PA-U pipe, shall not adversely affect pipe performance or
43、 initiate stress cracking. 4.2.2 Metal parts All parts susceptible to corrosion shall be adequately protected. When dissimilar metallic materials are used which may be in contact with moisture, steps shall be taken to avoid galvanic corrosion. Metals and materials produced by corrosion shall not aff
44、ect the long-term performance of the pipe/fitting. 4.2.3 Elastomers Elastomeric materials used for the manufacture of seals shall be in accordance with EN 682. 4.2.4 Other materials Greases or lubricants shall not exude on to the fusion areas, and shall not affect the long-term performance of the pi
45、pe/fitting. ISO 2012 All rights reserved 3 ISO 16486-3:2012(E) 5 General characteristics 5.1 Appearance When viewed without magnification, the internal and external surfaces of the fitting shall be smooth, clean and free from scoring, cavities and other surface defects such as would prevent conformi
46、ty of the fitting to this part of ISO 16486. 5.2 Design The design of the fitting shall be such that, when assembling the fitting onto the pipe, spigot ends or other components, the electrical coils and/or seals and other functional parts (e.g. grippers) are not displaced. 5.3 Colour The fitting sha
47、ll be either black or yellow. 5.4 Electrical character istics for electrofusion fit tings The electrical protection to be provided by the system depends on the voltage and the current used and on the characteristics of the electric power. For voltages greater than 25 V, direct human contact with the
48、 energized parts shall not be possible when the fitting is in the fusion cycle during assembly in accordance with the instructions of the manufacturer of the fittings and the assembly equipment, as applicable. This type of fitting is part of an electrical system as defined in IEC 60335-1, IEC 60364-
49、1 and IEC 60449. Protection against direct contact with active parts (live conductors) shall be required in accordance with IEC 60529. This protection is a function of the work site conditions. NOTE See Annex A for examples of typical electrofusion terminal connectors. The surface finish of the terminal pins shall allow a minimum contact resistance in order to satisfy the resistance tolerance requirements (nominal value 10 %). 5.5 Appearance of factory-made joints T
