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 5: Fitness for purpose of the system Systmes de canalisations en matires plastiques pour la distribution de combustibles gazeux Systmes de
2、 canalisations en polyamide non plastifi (PA-U) avec assemblages par soudage et assemblages mcaniques Partie 5: Aptitude lemploi du systme INTERNATIONAL STANDARD ISO 16486-5 First edition 2012-06-01 Reference number ISO 16486-5:2012(E) ISO 16486-5:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PR
3、OTECTED DOCUMENT ISO 2012 All rights reserved. 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
4、 member body in the country of the requester. 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 16486-5:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introducti
5、on v 1 Scope 1 2 Normative references . 1 3 T erms, definitions, symbols and abbreviated terms 2 3.1 T erms and definitions General 2 3.2 T erms and definitions for preparation of test assemblies by electrofusion . 2 4 Fitness for purpose . 5 4.1 Method of preparation of assemblies for testing . 5 4
6、.2 Requirements for fitness for purpose . 5 Annex A (normative) Preparation of test assemblies by butt fusion 10 Annex B (normative) Preparation of test assemblies by electrofusion .13 Annex C (normative) T est methods for the assessment of fitness for purpose of transition fittings .18 Bibliography
7、 .20 ISO 16486-5:2012(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 carried out through ISO technical committees. Each member body interested i
8、n 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 Electrotechnical Commis
9、sion (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 the technical
10、 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 rights. ISO shall
11、 not be held responsible for identifying any or all such patent rights. ISO 16486-5 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 edition of I
12、SO 16486-5 cancels and replaces the first edition of ISO 22621-5:2010 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 Unplasticized polyamide (PA-U) piping systems with fusion jointing and
13、mechanical jointing: ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing: Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness f
14、or purpose of the system Part 6: Code of practice for design, handling and installation iv ISO 2012 All rights reserved ISO 16486-5:2012(E) Introduction Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low pressures, while thicker wall thickne
15、ss pipes and butt fusion, electrofusion or mechanical joints are typically used for high pressures. For technical and safety reasons, it is not 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 v
16、ersa). In particular, solvent cement joints must not be used for jointing for high pressure piping systems. So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping systems for the supply of gaseous fuels is split into two series of International Standa
17、rds, with one series (ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and the other (ISO 16486) 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 rea
18、sonable 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 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems is in preparation. ISO 2012 All rights reserved v Plastics piping system
19、s for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 5: Fitness for purpose of the system 1 Scope This part of ISO 16486 specifies the requirements of fitness for purpose of the unplasticized polyamide (PA-U) piping system,
20、 intended to be buried and used for the supply of gaseous fuels. It also specifies the definitions of electrofusion and butt fusion joints. This part of ISO 16486 specifies the method of preparation of test piece joints and the tests to be carried out on these joints for assessing the fitness for pu
21、rpose of the system under normal and extreme conditions. It also specifies the test parameters for the test methods to which it refers. ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing and/or mechanical jointing. In conjunction with the other pa
22、rts of ISO 16486, it is applicable to PA-U fittings, their joints and to joints with components of PA-U. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition
23、cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditioning and testing ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the res
24、istance to internal pressure Part 1: General method ISO 1167- 4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 4: Preparation of assemblies ISO 6259-1, Thermoplastics pipes Determination of tensile properties Part
25、 1: General test method ISO 13953, Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joint ISO 13954, Plastics pipes and fittings Peel decohesion test for polyethylene (PE) electrofusion assemblies of nominal outside diameter
26、 greater than or equal to 90 mm ISO 13955, 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 fusion joints Evaluation of ductility of fusion joint interface by te
27、ar test ISO 16486-1, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems 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 w
28、ith fusion jointing and mechanical jointing Part 2: Pipes INTERNATIONAL STANDARD ISO 16486-5:2012(E) ISO 2012 All rights reserved 1 ISO 16486-5:2012(E) ISO 16486-3, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanic
29、al jointing Part 3: Fittings 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 T erms and definition s General 3.1.1 electrofusion joint joint between a PA-U
30、 electrofusion socket or saddle fitting and a pipe or a spigot end fitting NOTE The electrofusion fittings are heated by the Joule effect of the heating element incorporated at their jointing surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse. 3.1.2 but
31、 t f u si o n joint (u s i n g heat ed tool ) joint made by heating the planed ends the surfaces of which match by holding them against a flat heating plate until the PA-U material reaches fusion temperature, removing the heating plate quickly and pushing the two softened ends against one another 3.
32、1.3 f u si o n compatibilit y ability of two unplasticized polyamide materials of the same type to be fused together to form a joint which conforms to the performance requirements of this part of ISO 16486 3.1.4 t rans i t ion fi t t ing fitting that makes a transition joint between a unplasticized
33、polyamide (PA-U) piping and a metallic pipe 3.1.5 transition joint joint at which two different piping materials (the PA-U and metal piping) are connected 3.1.6 anodeless riser type of transition fitting which is designed to transport gas from an underground unplasticized polyamide (PA- U) service l
34、ine to above-ground steel piping NOTE In an anodeless riser, the PA-U pipe is always the gas carrier, at least, in the below ground section. 3.2 T erms and definition s for preparation of test assemblies by electrofusion 3.2.1 reference time t R theoretical fusion time indicated by the fitting manuf
35、acturer for the reference ambient temperature NOTE See Annex B. 3.2.2 fusion energy electrical energy supplied during the fusion-jointing cycle as measured at the terminals of the fitting at a given ambient temperature, T a , and for electrical parameters whose values lie within the tolerance ranges
36、 declared by the manufacturer NOTE 1 The fitting manufacturer is generally required to state in the technical file any variations in fusion energy input required as a function of the ambient temperature in the range T minto T max . 2 ISO 2012 All rights reserved ISO 16486-5:2012(E) NOTE 2 Where appl
37、icable, energy measurement should exclude the effect of terminal contact resistance. NOTE 3 See Annex B. 3.2.3 reference energy energy supplied to a fitting having a nominal electrical resistance and using the nominal fusion parameters defined by the manufacturer at the reference ambient temperature
38、, T R NOTE See Annex B. 3.2.4 maximum energy maximum value of the fusion energy supplied for jointing at a given ambient temperature, T a NOTE See Annex B. 3.2.5 minimum energy minimum value of the fusion energy supplied for jointing at a given ambient temperature, T a NOTE See Annex B. 3.2.6 nomina
39、l energy nominal energy supplied for jointing at given ambient temperature, T a NOTE See Annex B. 3.2.1 Symbols Application Symbol Description Unit Symbols u sed in more t han one phase of the fusion-jointing cycle a e n nominal pipe wall thickness mm d n nominal external diameter of the pipe p pres
40、sure applied to the butt fusion joint interface t duration of each phase in the fusion cycle T nor normal temperature (23 2) C C T max maximum permissible ambient temperature C T min minimum permissible ambient temperature C Symbols for joint g eomet r y a a misalignment between the pipes or fitting
41、s to be butt fused, expressed in terms of the difference, in millimetres, between, the external diameters mm w clearance between the fusion faces, expressed in terms of the gap, in millimetres, between the prepared faces mm Symbols for ambient temperature ab T a ambient temperature at which the join
42、t is made C Symbols but t fusion c yc l e parameters a General T heater-plate temperature, measured in the zone of the heater-plate surface in contact with the pipe or spigot ends to be butt fused C Phase 1: heating p 1 interface pressure during the heating phase, i.e. the pressure applied in the co
43、ntact zone MPa B 1 initial bead width taken as the bead width at the end of the heating phase mm t 1 heating time, taken as the time necessary to obtain a bead of width B 1in the joint region during the heating phase s ISO 2012 All rights reserved 3 ISO 16486-5:2012(E) Application Symbol Description
44、 Unit Phase 2: heat soak p 2 pressure between the heater plate and the pipe or spigot ends during the heat soak phase MPa t 2 duration of internal heating during the heat soak phase s Phase 3: withdrawal of heater plate t 3 time between the moment when the heater plate is removed from the pipe and/o
45、r spigot ends and the moment when the pipe and/or spigot ends are placed in contact with each other s Phase 4: pressure increase t 4 time required to establish the butt fusion pressure s Ph a s e 5: but t fusion p 5 pressure applied to the contact zone during the butt fusion phase MPa t 5 time durin
46、g which the assembly remains under the butt fusion pressure in the machine s Phase 6: cooling t 6 cooling time during which the butt fused assembly is not subjected to any rough handling; this cooling can take place outside the machine min B 2 bead width obtained at the end of the cooling phase mm S
47、ymbols for the preparation of test assemblies by electrofusion c D im mean inside diameter of the fusion zone of a fitting in the radial plane located a distance L 3+ 0,5L 2from the face of the fitting socket mm D im,max maximum theoretical value of D imas declared by the fitting manufacturer mm D i
48、,max maximum inside diameter of the fusion zone of the fitting mm D i,min minimum inside diameter of the fusion zone of the fitting mm d e outside diameter of a pipe or fitting spigot mm d em mean outside diameter of a pipe or fitting spigot in conformance with ISO 16486-2 and ISO 16486-3, as applic
49、able, and calculated from the measured circumference mm d emp mean outside diameter of a pipe or fitting spigot after preparation for assembly with the outer layer removed by scraping or peeling and calculated from the circumference measured in a radial plane coincident with the centre of the fusion zone at a distance L 3+ 0,5L 2from the face of the fitting socket after assembly mm e n nominal wall thickness of the pipe mm e s depth of scraping or the thicknes
