1、 ISO 2012Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 1: Butt fusionTubes et raccords en matires plastiques Appareillage pour lassemblage par soudage des systmes en polythylne Partie 1: Soudage bout boutINTERNATIONAL STANDARDISO12176-1Third edition2012-10-01Ref
2、erence numberISO 12176-1:2012(E)ISO 12176-1:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All 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 photocopy
3、ing 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 officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandISO
4、12176-1:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions . 14 Design configurations 25 Chassis and clamps . 25.1 General . 25.2 Guide elements 36 Interface force transmission 76.1 General . 76.2 Manual systems . 76.3 Hydraulic
5、 and pneumatic systems . 76.4 Electric systems 76.5 Performance . 77 Planing tool . 87.1 General . 87.2 Performance . 88 Heating plate . 88.1 General . 88.2 Dimensions . 88.3 Materials and surface finish . 98.4 Heating system 98.5 Performance .109 Power supply 1010 Test methods 1010.1 Chassis and cl
6、amps .1010.2 Planing tool and check of gap after planing 1110.3 Heating plate .1211 Auxiliary equipment 1512 Maintenance 1513 Marking on the butt fusion machine 1514 Other information to be provided by the manufacturer 15Annex A (normative) Additional performance requirements for butt fusion machine
7、s with automatic controllers .16Annex B (informative) Type classification scheme .17Bibliography .20ISO 12176-1:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stan
8、dards 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, governmental and non-governmental, in liaison with ISO, also t
9、ake 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 Directives, Part 2.The main task of technical committees is
10、 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 bodies casting a vote.Attention is drawn to the possibility
11、 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 12176-1 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee S
12、C 4, Plastics pipes and fittings for the supply of gaseous fuels.This third edition cancels and replaces the second edition (ISO 12176-1:2006), which has been technically revised.ISO 12176 consists of the following parts, under the general title Plastics pipes and fittings Equipment for fusion joint
13、ing polyethylene systems: Part 1: Butt fusion Part 2: Electrofusion Part 3: Operators badge Part 4: Traceability codingiv ISO 2012 All rights reservedINTERNATIONAL STANDARD ISO 12176-1:2012(E)Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 1: Butt fusion1 ScopeThi
14、s part of ISO 12176 specifies the general characteristics of, and performance requirements for, equipment for butt fusion jointing of polyethylene (PE) piping systems using electrically powered heater plates.It is applicable to mechanical and pressure-activated equipment for butt fusion jointing PE
15、pipes and fittings either intended to be used for the supply of gaseous fuels, conforming to ISO 4437 and ISO 8085-2, or intended for the conveyance of water for human consumption (including raw water prior to treatment) and for the conveyance of water for general purposes, conforming to ISO 4427-2
16、and ISO 4427-3.The normal ambient temperature range in which the butt fusion machine is intended to operate is 10 C to +40 C. Use outside this temperature range will need to be agreed between the user and the supplier of the machine.Butt fusion machines with an automatic controller are subject to ad
17、ditional requirements as given in Annex A.NOTE The requirements for machines may be different for larger diameters pipes than given in this part of ISO 12176.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only th
18、e edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parametersISO 4427-2, Plastics piping systems Po
19、lyethylene (PE) pipes and fittings for water supply Part 2: PipesISO 4427-3, Plastics piping systems Polyethylene (PE) pipes and fittings for water supply Part 3: FittingsISO 4437, Buried polyethylene (PE) pipes for the supply of gaseous fuels Metric series SpecificationsISO 8085-2, Polyethylene fit
20、tings for use with polyethylene pipes for the supply of gaseous fuels Metric series Specifications Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for use with electrofusion fittingsISO 11414, Plastics pipes and fittings Preparation of polyethylene (PE) pipe/pipe or
21、 pipe/fitting test piece assemblies by butt fusion3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1base frameworkself-supporting entity composed of two or more guides and pipe clampsNOTE This provides the mechanism for heating and fusing the pipe
22、s and/or fittings. ISO 2012 All rights reserved 1ISO 12176-1:2012(E)3.2frictional resistance of the butt fusion machineforce necessary to overcome friction in the whole mechanismNOTE See 6.1.3.3peak dragfriction at the point at which movement is initiated3.4dynamic dragfriction occurring during move
23、ment3.5nominal outside diameterdnnumerical designation of size which is common to all components in a thermoplastics piping system other than flanges and components designated by thread sizeNOTE 1 It is a convenient round number for reference purposes.NOTE 2 Adapted from ISO 161-1.3.6nominal wall th
24、icknessennumerical designation of the wall thickness of a component, which is a convenient round number approximately equal to the manufacturing dimension in millimetres3.7drag compensationability of the butt fusion machine to overcome mechanical and frictional forces, as well as forces caused by op
25、erating on site, in order to achieve and maintain the fusion parameters specified for the pipe4 Design configurationsTo conform to the requirements of this part of ISO 12176, butt fusion machines may have different design configurations, as follows: a mechanical linkage system for force generation;
26、a hydraulic hand-pump system for force generation; a semi-automatic externally powered system for force generation (manual preset of pressure); a semi-automatic system incorporating a device for monitoring and recording the fusion parameters; an automatic system that controls and records the fusion
27、parameters.Machines are generally designed for well-defined ranges of diameters, SDR ratios and fusion cycles.Each component of the machine shall conform to relevant national safety regulations.Machines which record fusion data shall be capable of transferring the data for further use.5 Chassis and
28、clamps5.1 GeneralThe butt fusion machine shall be as maintenance-free as possible.2 ISO 2012 All rights reservedISO 12176-1:2012(E)The base framework of the butt fusion machine shall provide rigidity and stability without unnecessary weight.The butt fusion machine shall be sufficiently robust to wit
29、hstand normal field use.The chassis shall provide facilities for the alignment of and relative movement between pipes and/or fittings.The butt fusion machine shall incorporate a facility for supporting the heating plate and planing tool when in use. This support shall not affect transmission of inte
30、rface forces across the heating plate and shall not prevent proper alignment of the heating plate during the heating operation.The butt fusion machine shall be capable of making satisfactory joints at ambient temperature and under normal worksite conditions with pipes and fittings at extremes of dim
31、ensional tolerances.With butt fusion machines designed for use in narrow trenches, the design and construction of the clamps shall enable the butt fusion machine to be removed from the trench after fusion without damaging the PE pipe.The base framework shall be fitted with a minimum of two clamps, o
32、ne fixed and one moveable, to position the PE pipes during the fusion cycle. These clamps shall be designed to enable the pipes to be positioned or removed quickly.The clamps shall grip the circumference of the pipes and fittings and shall be designed and dimensioned to avoid damage to the pipe or f
33、itting surfaces.To avoid human damage, the clamp jaws should preferably be designed so that they cannot close to less than a certain minimum distance apart.No adjustment of the centreline of either pipe shall be required after changing the relevant parts to accommodate different pipe sizes. The clam
34、ps, inserts and liners shall not damage the pipe or fitting.Clamps and/or liners for each pipe size should preferably be interchangeable between similar machines made by the same manufacturer.The maximum number of removable clamping layers shall be three for machines for pipe diameters up to and inc
35、luding dn= 400 mm, and four for machines for pipe diameters above dn= 400 mm.Operating instructions shall be available.5.2 Guide elements5.2.1 GeneralThe sliding surfaces of the guide elements shall be protected from corrosion, e.g. by hard chromium plate.The design of the butt fusion machine shall
36、allow the heating plate to be removed and the pipe ends to be closed after heating, without damaging the heated surfaces, within a maximum time as given in Table 1. ISO 2012 All rights reserved 3ISO 12176-1:2012(E)Table 1 Maximum time for removing the heating plateNominal wall thickness enmmMaximum
37、time tmaxsen 4,54,5 250 mmFigure 2 Heating-plate dimensions8.3 Materials and surface finishHeating plates shall be made of materials having good thermal conductivity and capable of resisting normal site handling.The surfaces which contact the pipe or fittings shall be such that molten material does
38、not stick to them, and they will allow damage-free cleaning and resist normal site handling. This can be attained, for example, by coating the surface with coloured PTFE (polytetrafluoroethylene) or by other surface treatments. The colour of the PTFE coating shall be such that, after the tool has be
39、en used for jointing operations, the presence of any surplus PE on the plate will be readily visible, regardless of any degradation of the PE or of the PTFE coating.No release spray of any type, such as PTFE, shall be used at any time during the jointing cycle. Such a spray coating can be transferre
40、d to the fusion interface during the jointing procedure.Alternatively, the heating plate may be made of hard-chromed or stainless steel.8.4 Heating systemThe heating plate shall be electrically heated.For heating systems with electrical-resistance heater elements, the heating plate shall be fitted w
41、ith a temperature-indicating device which clearly and visibly indicates when the operating temperature has been reached. This temperature indicator shall be independent of any other temperature control or monitoring system. It shall be protected from mechanical, electrical or thermal damage and shal
42、l be replaceable. ISO 2012 All rights reserved 9ISO 12176-1:2012(E)Heating plates shall be capable of continuous operation in the vertical position at their operating temperature for a minimum period of 4 h. After this period, the temperature of the grip shall not exceed 50 C, measured at ambient te
43、mperature and no sun exposure.An indicator shall be fitted to show clearly that the plate is under electric power and that it is heating up. This device shall indicate an operating temperature within 5 C of the plate temperature, measured at a predefined reference point.Provision shall be made to av
44、oid accidental changing of the pre-set temperature.8.5 Performance8.5.1 The surface roughness Ra, as defined in ISO 4287, of a hard-chromed or stainless-steel heating plate shall be less than 0,63 m when measured in accordance with 10.3.1, and this type of plate shall be free of all non-stick surfac
45、e coatings.If the heating-plate surfaces have a coating made of PTFE or some other non-stick material, then the contact faces shall have a maximum roughness Ra of 2,5 m when measured in accordance with 10.3.1.8.5.2 The coating shall be capable of withstanding for at least 1 h a temperature of 270 C.
46、 After cooling to ambient temperature and reheating to the fusion temperature, the coating material shall meet all requirements on it.The temperature control system shall be such that the contact surface temperature is controlled to within 7 C of the required temperature over the range 170 C to 260
47、C under ambient operating conditions in the temperature range 10 C to + 40 C.The temperature control system shall also conform to these criteria before and after 50 test cycles of heating and cooling between ambient temperature and the operating temperature in accordance with 10.3.2.8.5.3 The therma
48、l capacity and heat transfer efficiency shall be such that the interface temperature of a pipe of the maximum diameter and thickness can be raised from 5 C to 180 C in less than 20 s when the heating plate is at working temperature and the specified bead formation pressure is applied. This pipe inte
49、rface temperature shall be measured at a temperature of 5 C 2 C. Testing shall be carried out in accordance with 10.3.3.NOTE In case the interface temperature cannot be measured at 5 C 2 C, the interface temperature should be chosen between 5 C and 23 C 2 C and should be specified by the producer.9 Power supplyThe butt fusion machine shall be capable of operating satisfactorily from a domestic mains supply or from a generator.Machines designed for use with portable
