EN 1555-3:2002
(Main)Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings
This Part of prEN 1555 specifies the characteristics of fusion fittings made from polyethylene(PE) as well as of mechanical fittings made from PE and other materials for piping systems in the field of the supply of gaseous fuels. It also specifies the test parameters for the test methods referred to in the present standard. In conjunction with the other Parts of prEN 1555, it is applicable to PE fittings, their joints and to joints with components of PE and other materials intended to be used under the following conditions:- a maximum operating pressure, MOP, up to and including 10 bar; - an operating temperature of 20°C as ref.
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 3: Formstücke
Dieser Teil von EN 1555 legt Anforderungen an Formstücke aus Polyethylen (PE) für Schweißverbindungen und an Formstücke aus PE oder anderen Werkstoffen für mechanische Verbindungen fest, die in Rohrleitungs-systemen für die Gasversorgung eingesetzt werden.
Sie legt auch die Prüfparameter für die Prüfverfahren fest, auf die in dieser Norm verwiesen wird.
Zusammen mit den übrigen Teilen der EN 1555 (siehe Vorwort) gilt dieser Teil für Formstücke aus PE, deren Verbindungen untereinander sowie mit anderen Rohrleitungsteilen aus PE und anderen Werkstoffen, die unter den folgenden Bedingungen für die Gasversorgung vorgesehen sind:
a) der maximal zulässige Betriebsdruck MOP beträgt nicht mehr als 10 bar ;
b) es gilt eine Betriebstemperatur von 20 °C als Bezugstemperatur.
ANMERKUNG 1 Für andere Betriebstemperaturen können Minderungsfaktoren verwendet werden, siehe EN 1555-5.
EN 1555 enthält Festlegungen über maximal zulässige Betriebsdrücke und legt Anforderungen an die Einfärbung von Rohrleitungsteilen sowie die Verwendung von Zusatzstoffen fest.
ANMERKUNG 2 Der Anwender bzw. Auftraggeber ist unter Berücksichtigung der eigenen Anforderungen sowie der geltenden nationalen Festlegungen und Verlegepraktiken für die entsprechende Auswahl dieser Kriterien verantwortlich.
Diese Norm gilt für die folgenden Arten von Formstücken:
a) Heizwendel-Schweißmuffen;
b) Heizwendel-Schweißsattel;
c) Formstücke mit Schweißenden (für Heizelementstumpfschweißung und Heizwendelschweißung);
d) mechanische Rohrverbinder.
Die Formstücke können beispielsweise als Verbindungsstücke, Reduzierstücke, T-Stücke, Winkel, Bogen oder Verschlussstücke ausgeführt sein.
Systèmes de canalisations en plastique pour la distribution de combustibles gazeux - Polyéthylène (PE) - Partie 3: Raccords
La présente Partie de l'EN 1555 spécifie les caractéristiques des raccords soudables en polyéthylène (PE) ainsi que celles des raccords mécaniques fabriqués en PE et autres matières, pour les systèmes de canalisations destinées à la distribution de combustibles gazeux.
Elle spécifie également les paramètres d'essai des méthodes d'essai auxquelles la présente norme fait référence.
Conjointement avec les autres Parties de l'EN 1555 (voir Avant-propos), elle s'applique aux tubes en PE et à leurs assemblages, ainsi qu'à leurs assemblages avec des composants en PE et autres matières, destinés à être utilisés dans les conditions suivantes :
a) une pression maximale de service, MOP, jusques et y compris 10 bar ) ;
b) une température de service de 20 °C, comme température de référence.
NOTE 1 Pour d'autres températures de service, il convient d'utiliser des facteurs de réduction, voir l'EN 1555 5.
L'EN 1555 concerne une gamme de pressions maximales de service et donne les exigences concernant la couleur et les additifs.
NOTE 2 Il est de la responsabilité de l'acheteur ou du prescripteur de faire le choix approprié de ces différents aspects, en prenant en compte les exigences particulières et les réglementations nationales correspondantes ainsi que les pratiques ou codes de pose.
La présente norme est applicable aux raccords des types suivants :
a) raccords à emboîture électrosoudable ;
b) selles électrosoudables ;
c) raccords à bout mâle (pour soudage bout à bout à l'aide d'outils chauffants et pour soudage par emboîture électrosoudable) ;
d) raccords mécaniques.
Les raccords peuvent être, par exemple, des manchons, des tés égaux, des tés réduits, des réductions, des coudes ou des bouchons.
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen (PE) - 3. del: Fitingi
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen (PE) - 3. del: FitingiKunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 3: FormstückeSystemes de canalisations en plastique pour la distribution de combustibles gazeux - Polyéthylene (PE) - Partie 3: RaccordsPlastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings91.140.40Sistemi za oskrbo s plinomGas supply systems83.140.30Cevi, fitingi in ventili iz polimernih materialovPlastics pipes, fittings and valvesICS:Ta slovenski standard je istoveten z:EN 1555-3:2002SIST EN 1555-3:2003en01-oktober-2003SIST EN 1555-3:2003SLOVENSKI
STANDARD
SIST EN 1555-3:2003
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1555-3December 2002ICS 23.040.45; 91.140.40English versionPlastics piping systems for the supply of gaseous fuels -Polyethylene (PE) - Part 3: FittingsSystèmes de canalisations en plastique pour la distributionde combustibles gazeux - Polyéthylène (PE) - Partie 3:RaccordsKunststoff-Rohrleitungssysteme für die Gasversorgung -Polyethylen (PE) - Teil 3: FormstückeThis European Standard was approved by CEN on 1 November 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1555-3:2002 ESIST EN 1555-3:2003
EN 1555-3:2002 (E)2ContentspageForeword.4Introduction.51Scope.62Normative references.63Terms and definitions, symbols and abbreviations.74Material.84.1Compound.84.2Material for non-polyethylene parts.84.2.1General.84.2.2Metal parts.84.2.3Elastomers.94.2.4Other materials.95General characteristics.95.1Appearance.95.2Colour.95.3Design.95.4Appearance of the joint (factory-made).95.5Electrical characteristics for electrofusion fittings.96Geometrical characteristics.106.1Measurement of dimensions.106.2Dimensions of electrofusion socket fittings.106.2.1Diameters and lengths of sockets.106.2.2Wall thicknesses.116.2.3Out-of-roundness of the bore of a fitting (at any point).126.2.4Spigots.126.2.5Other dimensions.126.3Dimensions of electrofusion saddle fittings.126.4Dimensions of spigot end fittings.136.4.1Diameters and lengths.136.4.2Wall thickness of the fusion end.146.4.3Wall thickness of the fitting body.146.4.4Other dimensions.156.5Dimensions of mechanical fittings.156.5.1General.156.5.2Mechanical fittings with polyethylene spigot ends.156.5.3Mechanical fittings with polyethylene electrofusion sockets.156.5.4Threads.157Mechanical characteristics.157.1General.157.2Requirements.168Physical characteristics.188.1Conditioning.188.2Requirements.189Performance requirements.1810Marking.18SIST EN 1555-3:2003
EN 1555-3:2002 (E)310.1General.1810.2Minimum required marking.1810.3Additional marking.1911Delivery conditions.19Annex A (informative)
Examples of typical terminal connection for electrofusion fittings.20Bibliography.22SIST EN 1555-3:2003
EN 1555-3:2002 (E)4ForewordThis document EN 1555-3:2002 has been prepared by Technical Committee CEN /TC 155, "Plastics pipingsystems and ducting systems", the secretariat of which is held by NEN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn at the latest byDecember 2004.It has been prepared in liaison with Technical Committee CEN/TC 234 "Gas supply".This standard is a part of a System Standard for plastics piping systems of a particular material for a specifiedapplication. There are a number of such System Standards.System Standards are based on the results of the work undertaken in ISO/TC 138 "Plastics pipes, fittings andvalves for the transport of fluids", which is a Technical Committee of the International Organization forStandardization (ISO).They are supported by separate standards on test methods to which references are made throughout the SystemStandard.The System Standards are consistent with general standards on functional requirements and on recommendedpractice for installation.EN 1555 consists of the following parts, under the general title Plastics piping systems for the supply of gaseousfuels - Polyethylene (PE):— Part 1: General— Part 2: Pipes— Part 3: Fittings (this standard)— Part 4: Valves— Part 5: Fitness for purpose of the system— Part 7: Guidance for assessment of conformity (to be published as CEN/TS).NOTEThe document dealing with recommended practice for installation which was initially submitted for CEN enquiry as prEN 1555-6was withdrawn when EN 12007-2[1], prepared by CEN/TC 234 Gas supply, was published with the title "Gas supply systems - Pipelines formaximum operating pressure up to and including 16 bar – Part 2: Specific functional recommendations for polyethylene (MOP up to andincluding 10 bar)".This document includes an informative annex A and a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard : Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 1555-3:2003
EN 1555-3:2002 (E)5IntroductionThe System Standard, of which this is Part 3, specifies the requirements for a piping system and its componentsmade from polyethylene (PE) and which is intended to be used for the supply of gaseous fuels.Requirements and test methods for material and components, other than fittings, are specified in EN 1555-1,EN 1555-2 and EN 1555-4. Characteristics for fitness for purpose are covered in EN 1555-5. PrCEN/TS 1555-7gives guidance for assessment of conformity. Recommended practice for installation is given in EN 12007-2[1]prepared by CEN/TC 234.This part of EN 1555 covers the characteristics of fittings.SIST EN 1555-3:2003
EN 1555-3:2002 (E)61 ScopeThis part of EN 1555 specifies the characteristics of fusion fittings made from polyethylene (PE) as well as ofmechanical fittings made from PE and other materials for piping systems in the field of the supply of gaseous fuels.It also specifies the test parameters for the test methods referred to in this standard.In conjunction with the other parts of EN 1555 (see Foreword), it is applicable to PE fittings, their joints and to jointswith components of PE and other materials intended to be used under the following conditions:a)
a maximum operating pressure, MOP, up to and including 10 bar 1);b)
an operating temperature of 20 °C as reference temperature.NOTE 1For other operating temperatures, derating coefficients should be used, see EN 1555-5.EN 1555 covers a range of maximum operating pressures and gives requirements concerning colours andadditives.NOTE 2It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account theirparticular requirements and any relevant national regulations and installation practices or codes.This standard is applicable for fittings of the following types:a)
electrofusion socket fittings;b)
electrofusion saddle fittings;c)
spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);d)
mechanical fittings.The fittings can e.g. be in the form of couplers, equal and reduced tees, reducers, bends or caps.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 682, Elastomeric seals - Materials requirements for seals used in pipes and fittings carrying gas andhydrocarbon fluids.EN 728, Plastics piping and ducting systems ¾ Polyolefin pipes and fittings ¾ Determination of oxidation inductiontime.EN 921, Plastics piping systems — Thermoplastics pipes — Determination of resistance to internal pressure atconstant temperature.EN 1555-1:2002, Plastics piping systems for the supply of gaseous fuels ¾ Polyethylene (PE) ¾ Part 1: GeneralEN 1555-2:2002, Plastics piping systems for the supply of gaseous fuels ¾ Polyethylene (PE) ¾ Part 2: Pipes.EN 1555-5:2002, Plastics piping systems for the supply of gaseous fuels ¾ Polyethylene (PE) ¾ Part 5: Fitness forpurpose of the system.EN 1716, Plastics piping systems - Polyethylene (PE) tapping tees - Test method for impact resistance of anassembled tapping tee.
1)
1 bar = 0,1 MPaSIST EN 1555-3:2003
EN 1555-3:2002 (E)7EN 12117, Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow rate/pressuredrop relationships.EN ISO 1133, Plastics - Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) ofthermoplastics (ISO 1133:1997).prEN ISO 3126, Plastics piping systems - Plastics piping components - Measurement and determination ofdimensions (ISO/DIS 3126:1999).ISO 7-1, Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances
anddesignation.ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerancesand designation.ISO 10838-1, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ¾ Part 1: Metalfittings for pipes of nominal outside diameter less than or equal to 63 mm.ISO 10838-2, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ¾ Part 2: Metalfittings for pipes of nominal outside diameter greater than 63 mm.ISO 10838-3, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ¾ Part 3:Thermoplastic fittings for pipes of nominal outside diameter less than or equal to 63 mm.ISO 13953, Polyethylene (PE) pipes and fittings - Determination of the tensile strength and failure mode of testpieces from a butt-fused joint.ISO 13954, Plastics pipes and fittings - Peel decohesion test for polyethylene (PE) electrofusion assemblies ofnominal outside diameter greater than or equal to 90 mm.ISO 13955, Plastics pipes and fittings - Crushing decohesion test for polyethylene (PE) electrofusion assemblies.ISO/DIS 13956,Plastics pipes and fittings - Determination of cohesive strength - Tear test for polyethylene (PE)assemblies.3 Terms and definitions, symbols and abbreviationsFor the purposes of this European Standard, the terms and definitions, symbols and abbreviations given inEN 1555-1:2002 apply, together with the following.3.1electrofusion socket fittingpolyethylene (PE) fitting which contains one or more integral heating elements, that are capable of transformingelectrical energy into heat to realise a fusion joint with a spigot end or a pipe3.2electrofusion saddle fittingpolyethylene (PE) fitting which contains one or more integral heating elements, that are capable of transformingelectrical energy into heat to realise a fusion joint onto a pipe3.2.1tapping teeelectrofusion saddle fitting (top loading or wrap round) which contains an integral cutter, to cut through the wall ofthe main pipe. The cutter remains in the body of the saddle after installation3.2.2branch saddleelectrofusion saddle fitting (top loading or wrap round) which requires an ancillary cutting tool for drilling a hole inthe adjoining main pipeSIST EN 1555-3:2003
EN 1555-3:2002 (E)83.3mechanical fittingfitting for assembling polyethylene (PE) pipe to another PE pipe or any other element of the piping system. Thefitting includes generally a compression part to provide pressure integrity, leaktightness and resistance to endloads. A pipe supporting sleeve providing a permanent support for a polyethylene (PE) pipe to prevent creep in thepipe wall under radial compressive forces, is applicableNOTE 1The metallic parts of the fitting can be assembled to metallic pipes by screw-threads, compression joints, welded or flangedconnections, including PE flanges. The fitting can allow either a dismountable or permanently assembled joint.NOTE 2 In some cases the supporting sleeve at the same time constitutes a grip ring.NOTE 3The mechanical fitting can be supplied for field assembly or pre-assembled by the manufacturer.3.4spigot end fittingpolyethylene (PE) fitting where the outside diameter of the spigot end is equal to the nominal outside diameter, dn,of the corresponding pipe3.5voltage regulationcontrol of energy supplied, during the fusion process of an electrofusion fitting, by means of the voltage parameter3.6intensity regulationcontrol of energy supplied, during the fusion process of an electrofusion fitting, by means of the current parameter4 Material4.1 CompoundThe compound from which the fittings are made shall conform to EN 1555-1.4.2 Material for non-polyethylene parts4.2.1 GeneralAll components shall conform to the relevant EN standard(s). Alternative standards may be applied in cases wherethe suitable EN standard(s) do not exist. In all cases fitness for purpose of the components shall be demonstrated.The materials and the constituent elements used in making the fitting (including rubber, greases and any metalparts as may be used) shall be as resistant to the external and internal environments as the other elements of thepiping system and shall have a life expectancy under the following conditions at least equal to that of the PE pipesconforming to EN 1555-2:2002 with which they are intended to be used:a)
during storage;b)
under the effect of the gas conveyed therein;c)
with respect to the service environment and operating conditions.The requirements for the level of material performance of non-polyethylene parts shall be at least as stringent asthat of the compound for the piping system.Fittings material in contact with the PE pipe shall not adversely affect pipe performance or initiate stress cracking.4.2.2 Metal partsAll metal parts susceptible to corrosion shall be adequately protected.When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken to avoid thepossibility of galvanic corrosion.SIST EN 1555-3:2003
EN 1555-3:2002 (E)94.2.3 ElastomersElastomeric seals shall conform to EN 682.Other sealing materials are permitted if suitable for gas service.4.2.4 Other materialsGreases or lubricants shall not exude onto fusion areas, and shall not affect the long-term performance of fittingmaterials.Other materials conforming to 4.2.1 may be used provided that it is proven that the fittings conform to this standard.5 General characteristics5.1 AppearanceWhen viewed without magnification, the internal and external surfaces of fittings shall be smooth, clean and shallhave no scoring, cavities and other surface defects to an extent that would prevent conformity to this standard.No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions orcracks to an extent that would prevent conformity of the fittings to the requirements of this standard.5.2 ColourThe colour of the PE parts of fittings shall be either yellow or black.5.3 DesignThe design of the fitting shall be such that, when assembling the fitting onto the corresponding component,electrical coils and/or seals are not displaced.5.4 Appearance of the joint (factory-made)The internal and external surfaces of the pipe and fitting after fusion jointing, examined visually withoutmagnification, shall be free from melt exudation outside the confines of the fitting, apart from that which may bedeclared acceptable by the fitting manufacturer or used deliberately as a fusion marker.Any melt exudation shall not cause wire movement in electrofusion fittings such that it leads to short-circuiting,when jointed in accordance with the manufacturer's instructions. There shall be no excessive creasing of theinternal surfaces of the adjoining pipes.5.5 Electrical characteristics for electrofusion fittingsThe electrical protection that shall be provided by the fusion process depends on the voltage and the current usedand on the characteristics of the electricity power source.For voltages greater than 25 V, direct human contact with energized parts shall not be possible when the fitting is inthe fusion cycle during assembly in accordance with the instructions of the manufacturers of the fittings and of theassembly equipment, as applicable.NOTE 1
The fitting is during the fusion process part of an electrical system as defined in EN 60335-1[2], IEC 60364-1:2001[3] andIEC 60449:1973[4].The tolerance on the electrical resistance of the fitting at 23 °C shall be stated by the manufacturer. The resistanceshall not exceed the following value: (nominal value ± 10 %) + 0,1 W.NOTE 2
0,1 W is the value of the contact resistance.SIST EN 1555-3:2003
EN 1555-3:2002 (E)10The surface finish of the terminal pins shall allow a minimum contact resistance in order to satisfy the resistancetolerance requirements.NOTE 3
See annex A, for examples of typical electrofusion terminal connections.6 Geometrical characteristics6.1 Measurement of dimensionsDimensions shall be measured in accordance with prEN ISO 3126 at (23 ± 2) °C, after being conditioned for atleast 4 h. The measurement shall not be made less than 24 h after manufacture.6.2 Dimensions of electrofusion socket fittings6.2.1 Diameters and lengths of socketsFor electrofusion sockets (see Figure 1) having a nominal diameter given in Table 1, the socket diameter andlengths shall be given by the manufacturer and shall conform to Table 1 with the following conditions:a)
L3 ³ 5 mm;b)
D2 ³ dn - 2eminwhereeminis the minimum wall thickness specified for the corresponding pipe conforming to EN 1555-2;D1is the mean inside diameter in the fusion zone measured in a plane parallel to the plane of the mouth at adistance of L3 + 0,5L2 from that face;D2is the bore, which is the minimum diameter of the flow channel through the body of the fitting;L1is the depth of penetration of the pipe or male end of a spigot fitting. In case of a coupling without stop, itis not greater than half the total length of the fitting;L2is the heated length within a socket as declared by the manufacturer to be the nominal length of thefusion zone;L3is the distance between the mouth of the fitting and the start of the fusion zone as declared by themanufacturer to be the nominal unheated entrance length of the fitting.Figure 1 — Dimensions of electrofusion socket fittingsSIST EN 1555-3:2003
EN 1555-3:2002 (E)11Table 1 ¾ Dimensions of electrofusion socket fittingsDimensions in millimetresNominal diameterDepth of penetrationFusion zonednL1,minL1,maxL2,minIntensity regulationVoltage regulation162025324050637590110125140160180200225250280315355400450500560630202020202020232528323538424650557381899911012213514716125252525252831354053586268748088951041151271401551701882094141414449556370798287929810511212012913915016417919521223525510101010101011121315161820212326333539424751566167The mean inside diameter of the fitting in the middle of the fusion zone D1 shall be not less than dn.The manufacturer shall declare the actual minimum and maximum values of D1 to allow the end-user to determinetheir suitability for clamping and joint assembly and fitness for purpose testing in accordance with EN 1555-5:2002.In the case of a fitting having sockets of differing nominal diameters, each one shall conform to the requirementsfor the nominal diameter of the corresponding component.6.2.2 Wall thicknessesThe wall thickness of the body of the fitting at any point, E, shall be equal to or greater than emin for thecorresponding pipe at any part of the fitting located at a distance beyond a maximum of 2L1/3 from all entrancefaces of the fitting when the fitting and the corresponding pipe are made from a polyethylene with the samedesignation. If the fitting is produced from a polyethylene with MRS designation different from that of thecorresponding pipe, then the relationship between the wall thickness of the fitting body, E, and of the pipe, en, shallconform to Table 2.SIST EN 1555-3:2003
EN 1555-3:2002 (E)12Table 2 ¾ Relation between fitting and pipe wall thicknessesPipe and fitting materialPipeFittingRelation between fitting wallthickness, E, and pipe wallthickness, enPE
80PE 100E ³ 0,8enPE 100PE
80E ³ en/0,8Any changes in wall thickness of the fitting body shall be gradual in order to prevent stress concentrations.6.2.3 Out-of-roundness of the bore of a fitting (at any point)When a fitting leaves the site of the manufacturer, the out-of-roundness of the bore of a fitting at any point shall notexceed 0,015dn.6.2.4 SpigotsFor fittings, which contain spigot outlets (e.g. electrofusion equal tee with a spigotted branch), the dimensions ofthe spigot shall conform to 6.4.6.2.5 Other dimensionsThe dimensional characteristics appropriate to each manufacturer such as the overall dimensions or mountingdimensions shall be specified in a technical file.In the case of a coupling without an internal stop or with a removable centre register, the geometry of the fittingshall allow the penetration of the pipe through the fitting.6.3 Dimensions of electrofusion saddle fittingsOutlets from tapping tees and branch saddles shall have spigots conforming to 6.4 or an electrofusion socketconforming to 6.2.The manufacturer shall specify the overall dimensions of the fitting in a technical file. These dimensions shallinclude the maximum height of the saddle, H, and for tapping tees the height of the service pipe, H1 or H2 (seeFigure 2).KeyHis the maximum height of the saddle, which comprises the distance from the top of the main pipe to the top of the tappingtee or saddle.H1is the height of service pipe, which comprises the distance from the axis of the main pipe to the axis of the service pipe.H2is the height of service pipe, which comprises the distance from the top of the main pipe to the axis o
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