© ISO 2016 Wrapped electrofoaming joints for polyethylene (PE) piping systems with smooth outer wall for gravity drains and sewers Enveloppes d’assemblage électro expansibles pour les systèmes de cana[.]
TECHNICAL SPECIFICATION ISO/TS 17902 First edition 2016-11-15 Wrapped electrofoaming joints for polyethylene (PE) piping systems with smooth outer wall for gravity drains and sewers Enveloppes d’assemblage électro-expansibles pour les systèmes de canalisations en polyéthylène (PE) paroi extérieure lisse pour les collecteurs et branchements d’assainissement gravitaire Reference number ISO/TS 17902:2016(E) © ISO 2016 ISO/TS 17902 : 016(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2016, Published in Switzerland All rights reserved Unless otherwise specified, no part o f this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission Permission can be requested from either ISO at the address below or ISO’s member body in the country o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Contents Page Foreword iv Introduction v Scope Normative references Terms and definitions Symbols and abbreviated terms 4.2 Abbreviated terms Material f f f General requirements 6.1 General description of the wrapped electrofoaming joints 6.2 Appearance 6.3 Colour 6.4 Electrical properties Geometrical characteristics 7.1 General 7.2 Dimensions of the wrapped electrofoaming joint 7.3 Dimensions of the clamping band 8 Mechanical characteristics 8.2 Other mechanical characteristics 8.2.1 Preparations and pretreatment of test pieces 8.2.2 Test conditions and requirements Performance requirements 10 Marking 10.1 General 10.2 Minimum required marking Annex A (informative) Wrapped electrofoaming joint joining procedure guide 11 Bibliography 13 General terms and definitio ns Geo metrical terms and definitio ns 3 M aterial terms and definitio ns Symb o ls M aterial o r the main layer M aterial o r the 8.1 J o int material integrity © ISO 2016 – All rights reserved o aming layer iii ISO/TS 17902:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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, governmental 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso.org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) Any trade name used in this document is in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity assessment, as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html The committee responsible for this document is ISO/TC 138, Plastics pipes, fittings and valves for the transport o f fluids, Subcommittee SC , Plastics pipes and fittings for soil, waste and drainage (including land drainage) iv © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Introduction This document is the specification for electro foaming plastic pipe joints used in non-pressure underground drainage and sewerage for polyethylene (PE) piping systems with smooth outer wall The wrapped electro foaming joints may also be applied to pipes with diametrically deviated pipe ends The installation procedures specified in this document are intended to describe the proper joining method of electrofoaming joints An in formative guidance for the joining procedure o f products complying with this document is provided in Annex A © ISO 2016 – All rights reserved v TECHNICAL SPECIFICATION ISO/TS 17902:2016(E) Wrapped electrofoaming joints for polyethylene (PE) piping systems with smooth outer wall for gravity drains and sewers Scope This c u ment s p e c i fie s the defi n ition s and re qu i rements p olye thylene (PE ) pipi ng s ys tem s with s mo o th outer wa l l pressure for for wrapp e d ele c tro fo a m i ng j oi nts for u nderground d i n s a nd s ewer without T h i s c u ment s p e c i fie s pro duc t range, materia l charac teri s tic s , te s t me tho d s a nd te s t p ara me ters , dimension and characteristics of wrap This document is applicable to jointing pipes which have external wall thickness greater than 1,4 mm and a diameter up to DN/OD 2000, or DN/ID 2200 NOTE For dimensions larger than DN/OD 2000, or DN/ID 2200, this document can serve as a general guide NOTE Such products are intended to be used with pipes made from virgin and reworked materials re ga rd i ng ap p e a nce , colou r, p hys ic a l a nd me ch a n ic a l ch a rac ter i s tic s a s wel l a s p er for m a nce re qu i rements Normative references T he fol lowi ng c u ments are re ferre d to i n the tex t i n s uch a way th at s ome or a l l o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s 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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the resistance to internal pressure — Part 2: Preparation o f pipe test pieces ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pyknometer method and titration method ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions ISO 8772, Plastics piping systems for non-pressure underground drainage and sewerage — Polyethylene (PE) ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification, designation and design coefficient ISO 13254, Thermoplastics piping systems for non-pressure applications — Test method for watertightness ISO 13953, Polyethylene (PE) pipes and fittings — Determination ofthe tensile strength and failure mode of test pieces from a butt-fused joint ISO 21138-1, Plastics piping systems for non-pressure underground drainage and sewerage — Structuredwall piping systems o f unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) — Part 1: Material specifications and performance criteria for pipes, fittings and system ISO 21138-2, Plastics piping systems for non-pressure underground drainage and sewerage — Structuredwall piping systems o f unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) — Part 2: Pipes and fittings with smooth external surface, Type A © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Terms and definitions For the pur p o s e s o f th i s c u ment, the term s a nd defi n ition s given i n I S O 43 , I S O 7 , I S O 11 -1 , I S O 11 -2 , I S O , a nd I S O 10 43 -1 and the fol lowi ng apply ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp 3.1 General terms and definitions 3.1.1 structured-wall pipes and fittings pro duc ts that h ave an op ti m i z e d de s ign with re gard to mechanical and performance requirements of ISO 21138-1 materi a l u s age to ach ieve the phys ic a l , 3.1.2 solid-wall pipe and fitting p olye thylene pip e a nd fitti ng i ntende d for use for non-pre s s u re undergrou nd d rai n i ng and s ewerage N o te to entr y: P ro duc ts de fi ne d b y th i s ter m s h a l l co mp l y with I S O 7 3.1.3 main layer PE layer to ma i ntai n the fo am i ng layer i n contac t with the pip e s ur face s 3.1.4 foaming layer PE layer to wh ich s ub s tance s a re adde d i n order to en s u re exp a n s ion under s p e c i fie d he ati ng cond ition s , to ob tai n the fi na l prop er tie s o f the j oi nti ng 3.1.5 wrapped electrofoaming joint joint consisting of a main layer (3.1.3) and a f the pipes oam in g layer 3.1.6 clamping band f (3.1.4) and which can be wrapped around me ta l l ic a nc i l la r y ma i nta i ni ng the wrapp e d electro oamin g joint procedure and which can be removed after cooling (3.1.5 ) i n p o s ition du ri ng the a s s embly 3.1.7 electrofusion welding machine electric power source that supplies constant current and/or voltage to connect the pipe with the f (3.1.5) wrapped electro oamin g joint 3.2 Geometrical terms and definitions 3.2 nominal size DN nu meric a l de s ignation o f the s i z e o f a comp onent, o ther th an a comp onent de s ignate d b y th re ad s i z e, wh ich i s approxi mately e qua l to the ma nu fac tu ri ng d i men s ion i n m i l l i me tre s 3.2 nominal size DN/OD nominal size related to the outside diameter © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) 3.2 nominal size DN/ID nominal size related to the inside diameter 3.2 nominal diameter dn s p e ci fie d d i ame ter, i n m i l l i me tre s , as s igne d to a nom i na l s i z e (DN/OD or DN/I D) 3.2 outside diameter de va lue o f the me a s u rement o f the outs ide d i ame ter th rough its c ro s s - s e c tion at a ny p oi nt o f a pip e or fitti ng , rou nde d to the ne xt gre ater ,1 m m 3.2 mean inside diameter dim average va lue o f a nu mb er o f e qua l ly s p ace d me a s urements o f i n s ide d ia me ter i n the s a me c ro s s - s e c tion o f a pip e or fitti ng 3.2 minimum fitting wall thickness e me as u re d fitti ng wa l l th ickne s s at a ny p oi nt o f the b o dy o f a comp onent 3.3 Material terms and definitions 3.3.1 virgin material material in form such as granules or powder that have not been subjected to use or processing other f f been added tha n that re qu i re d or thei r manu ac tu re a nd to wh ich no repro ce s s able or re c yclab le materi a l s have 3.3.2 own reprocessable material materi a l prep a re d from rej e c te d unu s e d pip e s or fitti ngs , i nclud i ng tri m m i ngs from the pro duc tion o f pip e s a nd fitti ngs , that wi l l b e repro ce s s e d i n a manu fac tu rer ’s pla nt a fter havi ng b e en previou s ly pro ce s s e d b y the s ame manu fac tu rer by a pro ce s s s uch a s mou ld i ng or e xtru s ion a nd complete formulation is known for wh ich the 3.3.3 external reprocessable material material comprising either one of the following: a) from materi a l rej e c te d u nu s e d pip e s or fitti ngs , or tri m m i ngs there from, that wi l l be repro ce s s e d a nd that were origi na l ly pro ce s s e d b y a no ther manu fac tu rer; b) materi a l from the pro duc tion o f u nu s e d thermopl as tics pro duc ts o ther than pip e s and fitti ngs , regard le s s o f where they are manu fac tu re d 3.3.4 recyclable material material comprising either one of the following: a) materi a l b) materi a l from from u s e d pip e s or fitti ngs wh ich have b e en cle ane d a nd cru s he d or grou nd; used thermopla s tic s cleaned and crushed or ground © ISO 2016 – All rights reserved pro duc ts o ther tha n pip e s or fitti ngs wh ich h ave b e en ISO/TS 17902:2016(E) 4.1 Symbols and abbreviated terms Symbols dn outside diameter mean outside diameter mean inside diameter nominal diameter t fitti ng wa l l th ickne s s (at a ny p oi nt) tmin m i ni mu m fitti ng wa l l th ickne s s (at any p oi nt) de dem dim 4.2 Abbreviated terms DN/ID DN/OD ID OD PE S SDR 5.1 nominal size related to inside diameter nominal size related to outside diameter inside diameter outside diameter p olye thylene pipes series S standard dimension ratio Material Material for the main layer T he mai n l ayer s l l b e made from PE or PE 10 materi a l complyi ng with I S O 162 T he qua l i fic ation o f the materia l i s grante d as long a s it 5.2 fu l fi l s the re qui rements o f 7.1 Material for the foaming layer T he b a s e materia l for the fo a m i ng layer s l l have a den s ity from 11 kg/m to 940 kg/m3 , when me a s ure d accord i ng to I S O 1 -1 , to wh ich may b e adde d tho s e add itive s that are ne e de d to the manu fac tu re adhesive agent) o f fitti ng form i ng to the re qu i rements T he qua l i fic ation o f the materia l i s grante d as long a s it 6.1 fu l fi l s o f th i s c u ment (e g , the re qui rements o f faci l itate fo am i ng agent, 7.1 General requirements General description of the wrapped electrofoaming joints Wrapp e d ele c tro fo am i ng j oi nts s i s t o f s evera l layers (s e e Figure and Figure ): fo am i ng layer i nclud i ng ele c tric a l device and mai n layer © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Key b s e main layer o f electro fo aming j o int fo aming layer o f electro fo aming j o int clamping band of joint temperature sensor connection terminal electric connection terminal Figure — Schematics of electrofoaming joints X X Key fo aming layer o f electro fo aming j o int electric thermal wire emb edded in fo aming layer Figure — Schematics of foaming layer 6.2 Appearance When viewe d without magn i fication, wrapp e d ele c tro fo am i ng j oi nts s l l me e t the fol lowi ng requirements: — the internal and external surfaces shall be smooth, clean and free from grooving, blistering, i mpuritie s , p ore s and a ny o ther s u r face i rre gu l arity l i kely to prevent form ity with th i s c ument; — the ends of wrapped electrofoaming joints shall be square to their axis © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) The wrapped electrofoaming joints shall be homogeneous throughout, except where heating coils or injurious defects such as gouges, dents, cuts, etc The wrapped electrofoaming joints shall be as uni form as commercially practicable in opacity, density, and other physical properties Any heating coils, connecting cables, connectors, and related electrical power source shall be designed to prevent electrical shock to the user or electrical connectors are incorporated They will also be free o f cracks, holes, foreign inclusions, 6.3 Colour The colour o f each layer should pre ferably be black Other colours may be used 6.4 Electrical properties The electrical protection to be provided by the system depends on the voltage and the current strength used and on the characteristics o f the electricity power For voltages greater than 25 V, direct human contact with the energized parts shall not be possible when the joint is in the fusion cycle during assembly in accordance with the instructions o f the manu facturer o f the joints and assembly equipment, as applicable Geometrical characteristics 7.1 General Dimensions in Figure shall be measured in accordance with ISO 3126 NOTE The figure is a schematic sketch only, to indicate the relevant dimensions Key W L t main layer o f electro foaming joint foaming layer o f electro foaming joint layer width o f electro foaming joint layer length o f electro foaming joint thickness o f main layer Figure — Dimensions of electrofoaming layer 7.2 Dimensions of the wrapped electrofoaming joint The dimension o f wrapped electro foaming joint shall satis fy DN/OD and DN/ID series o f pipe allowance described in ISO 8772 and ISO 21138-2 and follow Table and Table © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Table — Wrapped electrofoaming joints layer dimension for DN/OD series Pipe Nominal nominal outside size diameter DN/OD 200 250 315 355 400 450 500 630 800 000 200 400 600 800 000 dn 200 250 315 355 400 450 500 630 800 000 200 400 600 800 000 Dimensions in millimetres Minimum layer length Minimum width 630 790 990 115 260 415 537 980 520 145 770 400 026 654 280 160 160 220 220 220 300 300 300 400 460 460 460 520 520 520 L Wmin Minimum thickness of the main layer tmin 5 5 6 6 7 7 7 Table — Wrapped electrofoaming joints layer dimension for DN/ID series Pipe Mean nominal inside size diameter DN/ID 300 360 400 450 500 600 700 800 900 000 200 400 500 600 800 000 200 dim 300 360 400 450 500 600 700 800 900 000 200 400 500 600 800 000 200 © ISO 2016 – All rights reserved Dimensions in millimetres Minimum layer length Minimum width 236 450 585 816 984 348 684 032 431 780 583 245 641 856 630 383 096 220 220 220 300 300 300 400 400 400 460 460 460 520 520 520 520 520 L Wmin Minimum thickness of the main layer tmin 5 6 6 6 7 7 7 7 ISO/TS 17902:2016(E) 7.3 Dimensions of the clamping band The clamping band shall cover the whole outer circumferences of the pipes and ensure that no gap remain between the clamping elements after tightening Mechanical characteristics 8.1 Joint material integrity T he j oi nt materia l i ntegrity i s a s s e s s e d with the te s t me tho d as s p e c i fie d i n p arame ters T he fo a m i ng l ayer i nte grate d with mai n layer, fi rm i ng to the re qu i rements given i n Table the materia l Table 3, using the indicated sh a l l h ave ch arac teri s tics Table — Joint material integrity requirements Characteristic Tensile strength a Resistance to internal pressureb Requirement > 20 MPa No failure during the test period Test parameter Cross-head speed Test temperature Pressure Typ e o f te s t Test period Test methods mm/min ISO 13953 80 °C ISO 1167-1 0,25 barc ISO 1167-2 In accordance with ISO 1167-1 Water-in-water 000 h Test piece shall be cut from a solid-wall pipe integrated with wrapped electrofoaming joints in longitudinal machine direction without the clamping band b This test shall be carried out in the form of a solid-wall pipe integrated with wrapped electrofoaming joints without the clamping band a c T he s p e c i fie d te s t p re s s u re s h a l l a m i n i mu m at a ny p o i nt o f the s a mp le (s p e c i a l l y the h i ghe s t p o i nt o f l a rge d i a me te r pipes), and added to the potential external pressure resulting from the outer water, due to water-in-water test 8.2 Other mechanical characteristics 8.2.1 Preparations and pretreatment of test pieces For the testing according to 8.2.2, test pieces shall be prepared in accordance with Table 4, from PE pipes and wrapped electrofusion joint, which have been assembled according to the manufacturer re com mendation s Un le s s o ther wi s e s p e ci fie d, (2 ± ) ° C and rel ative hu m id ity o f (5 ± 0) % te s t for s ample s s l l be cond itione d in temp eratu re h, b e fore b ei ng s ubm itte d to te s t Table — Test pieces preparation Characteristic Mechanical strength or fle xib i l ity Impact strength (drop test) 8.2.2 Test piece Wrap coupled with pipe Wrap coupled with pipe Preparation Number of test piece Wrap length Fuse (500 ± 100) mm pipe to the wrap Test conditions and requirements Table using the indicated parameters, the test pieces shall have mechanical characteristics conforming to the requirements given in Table When te s te d i n accorda nce with the te s t me tho d s a s s p e c i fie d i n © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Table — Mechanical characteristics Characteristic Impact strength (drop test) Mechanical strength or fle xib i l ity Requirement Test parameter Test methods See applicable pipe standard Test period 15 Minimum displacement 170 mm No signs of splitting Minimum momenta for: cracking, separation 0,15·[DN] × 10 kN·m [DN] > 250 0,01·[DN] kN·m −6 ISO 13264 [DN ] ≤ a Choose between minimum displacement and minimum moment, as applicable Performance requirements When de term i ne d i n accordance with the te s t me tho d s a s s p e c i fie d i n Table using the indicated p a rame ters , the fitne s s - for-pu rp o s e ch arac teri s tics o f the j oi nts and as s embly s l l form to the requirements given in Table Table — Fitness for-purpose characteristics of assembly Characteristic Test parameters Test temperature Tightness of electrofoaming Water or air pressure joints Air pressure E F de fle c tion (23 ± 5) °C 10 % 50 kPa (0,5 bar) −3 kP a (− , b a r) Requirements Test method No leakage Pressure after ISO 13254 m i n ≤ −2 kP a (− , b a r) 10 Marking 10.1 General M a rki ng elements s l l b e l ab el le d, pri nte d , or forme d d i re c tly on the ex terna l layer, i n s uch a way that a fter s torage, we atheri ng , nd l i ng a nd i n s ta l l ation, legibi l ity i s ma i ntai ne d M a rki ng s l l no t i n itiate c racks or o ther typ e s o f de fe c t th at advers ely i n fluence the p er formance o f the wrapped electrofoaming joints 10.2 Minimum required marking The minimum required marking of the wrapped electrofoaming joints shall conform to Table Table — Minimum required marking of the wrapped electrofoaming joints Information Nu mb er o f th i s Te ch n ic a l Sp e c i fic atio n Diameter series, nominal size DN/OD series ISO/TS 17902 Marking or symbols DN/OD 200 a S h a l l b e g i ve n i n cle a r fi g u re s o r i n a co de p ro vid i n g trace ab i l it y to the — the p ro duc tio n p er io d ye a r a nd mo nth; — the p ro duc tio n s ite i f the m a nu fac tu rer i s p ro duc i n g i n d i ffe rent s ite s , n atio n a l l y a nd/o r i nter n atio n a l l y © ISO 2016 – All rights reserved fo l lo wi n g de ta i l s : ISO/TS 17902:2016(E) Table (continued) Information And/or applicable DN/ID series Manufacturer’s name and/or trade mark Material Manufacturer’s information Marking or symbols DN/ID 200/198 XXX PE a a S h a l l b e g i ven i n cle a r fi g u re s o r i n a co de p ro vid i n g trace ab i l i t y to the — the p ro duc tio n p er io d ye a r a nd mo nth; — the p ro duc tio n s i te i f the m a nu fac tu re r i s p ro duc i ng i n d i fferent s i te s , n atio n a l l y a nd/o r i nte r n atio n a l l y 10 fo l lo wi n g de ta i l s : © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Annex A (informative) Wrapped electrofoaming joint joining procedure guide A.1 Fusion joint procedure for DN/OD and DN/ID below 600 — wrap A.1.1 Make a mark line on each end of the pipes to be connected Remove dirt, moisture and earth on the outer surface of the pipe and inner surface of the joint A.1.2 Place the wrap joint on the marked line of the pipe A.1.3 Tighten the wrap joint with the clamping band until the electrofoaming joint comes into contact with the pipe surface A.1.4 Connect the temperature sensor and the power cable terminal of the wrapped electrofoaming joints to the welding machine Input the information for fusion process on the welding machine if neces s ary Pres s the s tart b utto n o f the welding machine A.1.5 After the foaming fusion process stops, disconnect the temperature sensor and the power cable, then, remove the clamping band (see Figure A.1) Figure A.1 — Example of a wrap joint A.1.6 Print the fus io n data information, if it is available NO TE fro m the welding machine to check the fus io n integrity and to keep the T he u s e o f fitti n gs a nd j oi n i n g p ro ce du re s wh ich a re no t co vere d b y a re co gn i z e d s ta nda rd i s s ub j e c te d to the judgment and discretion of the purchaser Further investigation and testing could be needed to establish its s u itab i l ity a nd s a fe ty for the i ntende d s er vice © ISO 2016 – All rights reserved 11 ISO/TS 17902:2016(E) A.2 Fusion joint procedure for or more wrap joint (DN/OD and DN/ID over 700) — wrap process A.2.1 Make a mark line on each end of the pipes to be connected Remove dirt, moisture and earth on the outer surface of the pipe and the inner surface of the joint The electrofoaming wrap for DN/OD and DN/ID over 700 consists of two or more wraps, designated as A and B Place the EF-A and the EF-B on the marked line of the pipe A.2.2 A.2.3 Tighten the wrap joint with the clamping band until the electrofoaming joint comes into contact with the pipe surface Connect the temperature sensor and the power cable terminal of the EF-B joints to the welding f f f button of the welding machine A.2.4 machine I np ut the in fo rmatio n or us io n p ro ces s o n the welding machine i neces s ary Pres s the s tart After the foaming fusion process for EF-B is completed, disconnect the sensing terminal and the power cable of EF-B Repeat joining procedure A.2.4 on the EF-A part A.2.5 A.2.6 After the EF-A and EF-B wrap welding process, remove the clamping band A.2.7 Print the fus io n data fro m the welding machine i f p o s s ib le fo r checking the fus io n integrity A.3 Fusion joint procedure for or more wrap joint (DN/OD and DN/ID over 700) — wrap process The EF wrap for DN/OD and DN/ID above 400 consists of four wraps, designated as A-1, A-2, B-1, B-2 A.3.1 A.3.2 Assemble A-1 and B-1(same with A-2 and B-2), see Figure A.2 Figure A.2 — Example of a 2-wrap joints A.3.3 Place the assembled wraps (EF A-1/B-1 and EF A-2/B-2) on the marked line of the pipe Assembling and jointing methods are the same as the aforementioned steps A.2.3 to A.2.7 A.3.4 12 The fusion joint sequences are as follows: B-1, B-2, A-1, A-2 © ISO 2016 – All rights reserved ISO/TS 17902:2016(E) Bibliography [1] ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special [2] ISO 13272, Plastics piping systems for non-pressure underground drainage and sewerage — Unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP), polypropylene with mineral modifiers (PP-MD) and polyethylene (PE) — Specifications for manholes and inspection chambers in traffic characteristics areas and underground installations © ISO 2016 – All rights reserved 13 ISO/TS 17902 : 016(E) ICS 23.040.20; 23.040.45; 93.030 Price based on 13 pages © ISO 2016 – All rights reserved