SIST EN 12842:2012

Ductile iron fittings for PVC-U or PE piping systems - Requirements and test methods

This European Standard specifies the requirements and associated test methods applicable to ductile iron fittings, ductile iron and mild steel couplings and flange adaptors and their joints to be used with poly(vinyl chloride) (PVC-U) pipes or polyethylene (PE) pipes. It is in conformity with EN 1452-1 to -5, ENV 1452-6 and - 7 and EN 12201-1 to -5 respectively, for the construction of pipelines: - to convey water (e.g. water intended for human consumption); - with or without pressure; - to be installed below or above ground, inside or outside buildings. This European Standard is not intended to cover sewerage applications, where additional requirements may be necessary. This European Standard is applicable to fittings which are: - manufactured with socketed, flanged or spigot ends; - supplied externally and internally coated; - suitable for PE and PVC-U pipes with fluid temperatures between 0°C and 25°C, excluding frost, and for pressures up to 16 bar (PFA). For higher temperatures (up to 45°C for PVC-U or 40°C for PE) the PFA is derated as given in EN 1452 and EN 12201; - not intended for use in areas subjected to reaction to fire regulations. This European Standard covers ductile iron fittings, couplings and flange adaptors cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from 63 mm to 710 mm. As long as no equivalent European Standard exists for mild steel accessories, this European Standard also covers couplings and flange adaptors for use with PVC-U and PE pipes which are fabricated partly or entirely from mild steel as well as corresponding joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from 63 mm to 710 mm. This European Standard specifies requirements for materials, dimensions and tolerances, mechanical properties and standard coatings. It also gives minimum performance requirements for all components, including restrained and non-restrained flexible joints. Joint design and gasket shapes are outside the scope of this standard. This European Standard does not cover fittings, couplings and flange adaptors intended to be used with different pipe materials other than PVC-U and PE.

Duktile Gussformstücke für PVC-U- oder PE-Rohrleitungssysteme - Anforderungen und Prüfverfahren

Diese Europäische Norm legt Anforderungen und Prüfverfahren für Formstücke aus duktilem Gusseisen, für Kupplungen und Flanschverbindungsstücke aus unlegiertem Stahl (Weichstahl, Baustahl) und für deren Verbindungen fest, die im Rohrleitungsbau mit Rohren aus Polyvinylchlorid (PVC U Rohren) oder Polyethylen (PE) nach EN 1452 1 bis EN 1452 7 bzw. EN 12201 1 bis EN 12201 5 anzuwenden sind:
-   zum Transport von Wasser (z. B. Trinkwasser);
-   mit oder ohne Druck;
-   oberirdisch oder erdüberdeckt, innerhalb oder außerhalb von Gebäuden.
Diese Norm ist nicht für Abwasseranwendungen vorgesehen, für die zusätzliche Anforderungen erforderlich sein können.
Diese Norm ist auf Formstücke anwendbar, die
-   mit Muffenenden, Flanschenden oder Spitzenden hergestellt sind;
-   mit einer Beschichtung außen und innen geliefert werden;
-   für PE  und PVC U Rohre zum Transport strömender Medien bei Temperaturen zwischen 0 °C und 25 °C, Frost ausgeschlossen, und für Drücke bis 16 bar (PFA) geeignet sind. Bei höheren Temperaturen (bis 45 °C für PVC U Rohre oder 40 °C für PE Rohre) ist der PFA, wie in EN 1452 und EN 12201 angegeben, herabzusetzen;
-   nicht für die Anwendung in Bereichen vorgesehen sind, für die Brandschutzvorschriften einzuhalten sind.
ANMERKUNG 1   Die genannten Anforderungen schließen Sondervereinbarungen für Produkte, die bei höheren Temperaturen anzuwenden sind, nicht aus. Einschränkungen für Temperatur und Druck ergeben sich aus den Eigenschaften der PVC U  oder PE Rohre.
Diese Norm gilt für Formstücke, Kupplungen und Flanschverbindungsstücke aus duktilem Gusseisen, die nach einem beliebigen Gießverfahren gegossen oder aus gegossenen Einzelteilen hergestellt werden und ebenso für die entsprechenden Verbindungen, für den Nennweitenbereich von DN 60 bis DN 700, anzuwen-den für Rohre mit einem Außendurchmesser von 63 mm bis 710 mm.
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Raccords en fonte ductile pour systèmes de canalisations en PVC-U ou en PE - Prescriptions et méthodes d'essai

La présente norme européenne décrit les prescriptions et les méthodes d'essai associées, applicables aux raccords en fonte ductile, manchons et adaptateurs de bride en acier doux, ainsi que leurs assemblages, à utiliser avec les tuyaux en polychlorure de vinyle (PVC-U) ou en polyéthylène (PE), conformes aux EN 1452 1 à 7 et à l'EN 12201-1 à 7 respectivement, destinés à la construction de canalisations :
-   pour transporter de l'eau (par exemple de l'eau destinée à la consommation humaine) ;
-   avec ou sans pression ;
-   pour être installés dans le sol ou en aérien, à l'intérieur ou à l'extérieur des bâtiments.
Cette norme ne couvre pas les applications d'assainissement, où des prescriptions supplémentaires peuvent être nécessaires.
Cette norme est applicable aux raccords qui sont :
-   fabriqués avec des extrémités à emboîture, à bride ou à bout uni ;
-   livrés revêtus extérieurement et intérieurement ;
-   utilisables pour les tuyaux en PVC-U et en PE avec des températures de fluide comprises entre 0 °C et 25 °C, gel exclu, et pour des pressions pouvant atteindre 16 bar (PFA). Pour des températures supérieures (jusqu'à 45 °C pour le PVC-U ou 40 °C pour le PE) la PFA est détimbrée conformément à l'EN 1452 et à l'EN 12201 respectivement.
-   non destinés à l'usage dans des domaines sujets à une réglementation sur les risques d'incendie.
NOTE 1   Ceci n'exclut pas les dispositions spéciales permettant d'utiliser les produits à des températures plus élevées. Les limitations de température et de pression sont celles qui proviennent des tuyaux en PVC-U ou en PE.
Cette norme traite des raccords, manchons et adaptateurs de bride en fonte ductile, coulés par tout procédé de fonderie ou fabriqués à partir de composants moulés, ainsi que les assemblages correspondants, pour la gamme des DN 60 à DN 700, à utiliser avec des tuyaux de diamètre extérieur allant de 63 mm à 710 mm.
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Fitingi iz duktilne litine za PVC-U ali PE cevne sisteme - Zahteve in preskusne metode

Ta evropski standard določa zahteve in z njimi povezane preskusne metode za fitinge iz duktilne litine, spoje in prirobnične prilagoditve ter njihove stike iz duktilne litine in mehkega jekla, ki jih je treba uporabljati s cevmi iz polivinilklorida (PVC-U) ali polietilena (PE). Je v skladu s standardi EN 1452-1 do-5, ENV 1452-6 in - 7 ter EN 12201-1 do -5 za gradnjo cevovodov: – za prenos vode (npr. pitne vode); – tlačnih ali netlačnih; – za podzemno ali nadzemno namestitev v stavbah ali na prostem. Ta evropski standard ne zajema področja kanalizacije, za katero so lahko potrebne dodatne zahteve. Ta evropski standard se uporablja za fitinge, ki so: – proizvedeni z zaključki s spoji z vtičnimi obojkami, prirobnicami ali koncem cevi, ki se prilega drugi cevi; dobavljeni z zunanjim in notranjim premazom; – primerni za polivinilkloridne ali polietilenske cevi s temperaturami tekočine med 0 °C in 25 °C, brez zamrznitve, in tlakom do 16 barov (PFA). Za višje temperature (do 45 °C za PVC-U ali 40 °C za PE) je PFA omejen, kot je določeno v standardih EN 1452 in EN 12201; – ni za uporabo na področjih, za katere veljajo predpisi o požarni odpornosti. Ta evropski standard zajema fitinge iz duktilne litine, spoje in prirobnične prilagoditve, ulite s katerim koli livarskim postopkom ali proizvedene z izdelavo litih sestavnih delov, ter ustrezne stike velikosti od DN 60 do DN 700, ki se uporabljajo s cevmi z zunanjim premerom od 63 mm do 710 mm. Če za sklope iz mehkega jekla ni enakovrednega evropskega standarda, ta standard zajema tudi spoje in prirobnične prilagoditve, ki se uporabljajo s polivinilkloridnimi in polietilenskimi cevmi in so v celoti ali delno izdelani iz mehkega jekla, ter ustrezne stike velikosti od DN 60 do DN 700, ki se uporabljajo s cevmi z zunanjim premerom od 63 mm do 710 mm. Ta evropski standard določa zahteve za materiale, dimenzije in tolerance ter mehanske lastnosti in standardne premaze. Določa tudi zahteve glede zmogljivosti za vse sestavne dele, vključno s pritrjenimi in nepritrjenimi gibljivimi stiki. Konstruiranje stikov in oblike tesnil ne spadajo na področje uporabe tega standarda. Ta evropski standard ne zajema fitingov, spojev in prirobničnih prilagoditev za uporabo z različnimi materiali za cevi, ki niso iz polivinilklorida in polietilena.

General Information

• Status: Published
• Public Enquiry End Date: 19-Aug-2010
• Publication Date: 27-Sep-2012
• ICS: 23.040.40 - Metal fittings
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Aug-2012
• Due Date: 02-Nov-2012
• Completion Date: 28-Sep-2012
• Ref Project: EN 12842:2012 - Ductile iron fittings for PVC-U or PE piping systems - Requirements and test methods

Relations

• Replaces: SIST EN 12842:2001 - Ductile iron fittings for PVC-U or PE piping systems - Requirements and test methods
• Effective Date: 01-Oct-2012

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fitingi iz duktilne litine za PVC-U ali PE cevne sisteme - Zahteve in preskusne metodeDuktile Gussformstücke für PVC-U- oder PE-Rohrleitungssysteme - Anforderungen und PrüfverfahrenRaccords en fonte ductile pour systèmes de canalisations en PVC-U ou en PE - Prescriptions et méthodes d'essaiDuctile iron fittings for PVC-U or PE piping systems - Requirements and test methods23.040.40Kovinski fitingiMetal fittingsICS:Ta slovenski standard je istoveten z:EN 12842:2012SIST EN 12842:2012en,fr,de01-oktober-2012SIST EN 12842:2012SLOVENSKI
STANDARDSIST EN 12842:20011DGRPHãþD



SIST EN 12842:2012



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12842
August 2012 ICS 23.040.40 Supersedes EN 12842:2000English Version
Ductile iron fittings for PVC-U or PE piping systems - Requirements and test methods
Raccords en fonte ductile pour systèmes de canalisations en PVC-U ou en PE - Prescriptions et méthodes d'essai
Duktile Gussformstücke für PVC-U oder PE-Rohrleitungssyteme - Anforderungen und Prüfverfahren This European Standard was approved by CEN on 23 June 2012.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12842:2012: ESIST EN 12842:2012



EN 12842:2012 (E) 2 Contents Page Foreword .31Scope .42Normative references .53Terms and definitions .54Technical requirements .84.1General .84.2Dimensional requirements . 104.3Material characteristics . 124.4Coatings . 134.5Marking . 144.6Leak tightness . 145Performance requirements for joints. 145.1General . 145.2Leak tightness of flexible joints . 155.3Long term hydrostatic strength test . 175.4Flanged joints . 196Test methods . 196.1Tensile testing for ductile iron . 196.2Brinell hardness for ductile iron . 206.3Works leak tightness test . 217Performance tests. 217.1Leak tightness of joints to internal hydrostatic pressure . 217.2Leak tightness of joints to negative internal pressure . 237.3Leak tightness of joints to dynamic internal pressure . 247.4Long term hydrostatic strength test for joints of fittings for PE pipes . 247.5Pull out test at 25 ºC for restrained joints for PE pipes . 257.6Long term hydrostatic strength test for joints of fittings for PVC-U pipe . 258Tables of dimensions . 268.1Dimensions of sockets for push-in flexible joints . 268.2Dimensions of sockets for mechanical flexible joints . 288.3Dimensions of fittings . 299Evaluation of conformity . 449.1General . 449.2Initial performance testing . 459.3Factory production control (FPC) . 46Bibliography . 49 SIST EN 12842:2012



EN 12842:2012 (E) 3 Foreword This document (EN 12842:2012) has been prepared by Technical Committee CEN/TC 203 “Cast iron pipes, fittings and their joints”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2013, and conflicting national standards shall be withdrawn at the latest by February 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12842:2000. The significant changes made since the previous version are as follows: a) Wording (relating to accessories, fittings, coupling and flange adaptor) modified in accordance with EN 545; b) Improvement of shear load test for flange adapter and one socket fitting; c) Addition of aging test for PE pipe fittings and accessories. This European Standard was prepared in co-operation with CEN/TC 155 "Plastics piping systems". This standard is in conformity with the general requirements already established by CEN/TC 164 in the field of water supply. In respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this standard:  this standard provides no information as to whether the product may be used without restriction in any of the member states of the EU or EFTA;  it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of these products remain in force. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 12842:2012



EN 12842:2012 (E) 4 1 Scope This European Standard specifies the requirements and associated test methods applicable to ductile iron fittings, ductile iron and mild steel couplings and flange adaptors and their joints to be used with poly(vinyl chloride) (PVC-U) pipes or polyethylene (PE) pipes. It is in conformity with EN 1452-1 to -5, ENV 1452-6 and -7 and EN 12201-1 to -5 respectively, for the construction of pipelines:  to convey water (e.g. water intended for human consumption);  with or without pressure;  to be installed below or above ground, inside or outside buildings. This European Standard is not intended to cover sewerage applications, where additional requirements may be necessary. This European Standard is applicable to fittings which are:  manufactured with socketed, flanged or spigot ends;  supplied externally and internally coated;  suitable for PE and PVC-U pipes with fluid temperatures between 0°C and 25°C, excluding frost, and for pressures up to 16 bar (PFA). For higher temperatures (up to 45°C for PVC-U or 40°C for PE) the PFA is derated as given in EN 1452 and EN 12201;  not intended for use in areas subjected to reaction to fire regulations. NOTE 1 This does not preclude special arrangements for the products to be used at higher temperatures. Temperature limitations and pressure limitations are those coming from the PVC-U or PE pipes. This European Standard covers ductile iron fittings, couplings and flange adaptors cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from 63 mm to 710 mm.
As long as no equivalent European Standard exists for mild steel accessories, this European Standard also covers couplings and flange adaptors for use with PVC-U and PE pipes which are fabricated partly or entirely from mild steel as well as corresponding joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from 63 mm to 710 mm.
This European Standard specifies requirements for materials, dimensions and tolerances, mechanical properties and standard coatings. It also gives minimum performance requirements for all components, including restrained and non-restrained flexible joints. Joint design and gasket shapes are outside the scope of this standard. This European Standard does not cover fittings, couplings and flange adaptors intended to be used with different pipe materials other than PVC-U and PE. NOTE 2
Fittings, couplings and flange adaptors complying with the requirements of this European Standard for PVC-U also usually meet the requirements for PVC-O and PVC-A pipes. Where this is not the case, the manufacturer is expected to declare this in the relevant literature.
NOTE 3 In this European Standard, all pressures are relative pressures, expressed in bars (100 kPa = 1 bar). SIST EN 12842:2012



EN 12842:2012 (E) 5 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 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 681-1, Elastomeric seals  Material requirements for pipe joint seals used in water and drainage applications  Part 1: Vulcanised rubber EN 805:2000, Water supply  Requirements for systems and components outside buildings EN 1092-2, Flanges and their joints  Circular flanges for pipes, valves, fittings and accessories, PN designated  Part 2: Cast iron flanges EN 10025-1:2004, Hot rolled products of structural steels  General technical delivery conditions EN 10310, Steel tubes and fittings for onshore and offshore pipelines  Internal and external polyamide powder based coatings EN 14901, Ductile iron pipes, fittings and accessories  Epoxy coating (heavy duty) of ductile iron fittings and accessories – Requirements and test methods EN 15189, Ductile iron pipes, fittings and accessories  External polyurethane coating for pipes  Requirements and test methods EN 15655, Ductile iron pipes, fittings and accessories  Internal polyurethane lining for pipes and fittings  Requirements and test methods EN ISO 1167-1:2006, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids  Determination of the resistance to internal pressure  Part 1: General method (ISO 1167-1:2006) EN ISO 4016, Hexagon head bolts  Product grade C (ISO 4016) EN ISO 4034, Hexagon nuts  Product grade C (ISO 4034) EN ISO 6506-1, Metallic materials  Brinell hardness test  Part1: Test method (ISO 6506-1) EN ISO 7091, Plain washers  Normal series  Product grade C (ISO 7091) EN ISO 9001:2008, Quality management systems  Requirements (ISO 9001:2008) EN ISO 13846:2000, Plastic piping systems  End-load-bearing and non-end-load-bearing assemblies and joints for thermoplastics pressure piping  Test method for long-term leaktightness under internal water pressure (ISO 13846:2000) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ductile iron cast iron used for fittings in which graphite is present substantially in spheroïdal form 3.2 fitting casting other than a pipe which allows pipeline deviation, change of direction or bore SIST EN 12842:2012



EN 12842:2012 (E) 6 [SOURCE: EN 545] 3.3 flange end of a fitting or flange adaptor extending perpendicular to its axis, with bolt holes equally spaced on a circle Note 1 to entry: A flange can be fixed (e.g. integrally cast or welded) or adjustable; an adjustable flange comprises a ring, in one or several parts assembled together, which bears on an end joint hub and can be freely rotated around the axis before jointing. 3.4 spigot male end of a pipe or fitting 3.5 socket female end of a pipe or fitting to make the connection with the spigot of the next component 3.6 gasket sealing component of a joint 3.7 joint connection between the ends of two components in which a gasket is used to effect a seal 3.8 flexible joint joint which permits significant angular deflection both during and after installation and which can accept a slight offset of the centreline 3.9 push-in flexible joint flexible joint assembled by pushing the spigot through the gasket in the socket of the mating component 3.10 mechanical flexible joint flexible joint in which sealing is obtained by applying pressure to the gasket by mechanical means, e.g. a gland 3.11 restrained flexible joint flexible joint in which a means is provided to prevent separation of the assembled joint 3.12 flanged joint joint between two flanged ends 3.13 nominal size
DN/OD alphanumeric designation of size for components of a pipework system, which is used for reference purposes
Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections. Note 2 to entry:
Adapted from EN ISO 6708:1995, definition 2.1. Note 3 to entry: Plastic pipes are only defined as DN/OD. SIST EN 12842:2012



EN 12842:2012 (E) 7 3.14 nominal outside diameter (dn) specified outside diameter, in millimetres, assigned to a nominal size DN/OD [SOURCE: EN 12201-1] 3.15 minimum socket inside diameter (di min) minimum value of the internal diameter of the socket mouth 3.16 nominal pressure PN alphanumerical designation, which comprises a convenient rounded number used for reference purposes Note 1 to entry: All components of the same nominal size, DN, designated by the same PN have compatible mating dimensions. Note 2 to entry: Adapted from EN 1333:2006. Note 3 to entry: In EN 1452 and EN 12201, the term nominal pressure (PN) at 20°C is used in place of PFA. 3.17 allowable operating pressure (PFA)
maximum hydrostatic pressure that a component is capable of withstanding continuously in service [SOURCE: EN 805:2000] Note 1 to entry: In EN 1452 and EN 12201, the term nominal pressure (PN) at 20°C is used in place of PFA. 3.18 leak tightness test pressure pressure applied to a component during manufacture in order to ensure its leak tightness 3.19 allowable maximum operating pressure (PMA) maximum pressure occurring from time to time, including surge, that a component is capable of withstanding in service [SOURCE: EN 805:2000] 3.20 allowable test pressure (PEA) maximum hydrostatic pressure that a newly installed component is capable of withstanding for a relatively short duration, in order to ensure the integrity and tightness of the pipeline [SOURCE: EN 805:2000] Note 1 to entry: This test pressure is different from the system test pressure (STP), which is related to the design pressure of the pipeline and is intended to ensure its integrity and leak tightness. 3.21 batch quantity of castings from which a sample is taken for testing purposes during manufacture 3.22 performance test proof of design test which is done once and is repeated only after change of design SIST EN 12842:2012



EN 12842:2012 (E) 8 3.23 length effective length of a fitting, as shown on the figures of Clause 8 Note 1 to entry: For flanged fittings, the effective length L (l for branches) is equal to the overall length. For socketed fittings, the effective length is designated Z in plastics piping systems standards and Lu (lu for branches) in EN 545; it is equal to the overall length minus the spigot insertion depth as given in the manufacturer's catalogues. 3.24 flange adaptor accessory which:  is used in a pipeline to make the connection with a spigot of a pipe or fitting and the flange of another component of the pipeline (e.g. pipe, fitting, valve etc.); and  allows for angular and axial displacements for unrestrained joints and angular displacements for restrained flexible joints Note 1 to entry: Some flange adaptors are designed such that they can be slid over the pipes in order to facilitate easy assembly. Note 2 to entry: As defined in EN 545, Flange Adaptors are accessories. 3.25 coupling accessory which:  is used in a pipeline to make the connection between two spigots of pipes, fittings or valves, etc.; and  allows for angular and axial displacements for unrestrained joints and angular displacements for restrained flexible joints Note 1 to entry: Some couplings are designed such that they can be slid over the pipes in order to facilitate easy assembly. Note 2 to entry: As defined in EN 545, Couplings are accessories. 4 Technical requirements 4.1 General 4.1.1 Fittings Nominal sizes, minimum wall thicknesses, lengths and coatings are specified in 4.1.2, 4.2.1/4.2.2, 4.2.3 and 4.4 respectively. When, for specific needs, fittings with different lengths and/or coatings and other types of fittings than those given in Clause 8 are supplied with reference to this standard, they shall comply with all other requirements of this standard. 4.1.2 Standardized sizes The standardised sizes of fittings, corresponding to the nominal outside diameter dn (in millimetres) of the pipes to which they shall be connected, are as follows: 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710. SIST EN 12842:2012



EN 12842:2012 (E) 9 4.1.3 Surface condition and repairs Fittings, couplings and flange adaptors shall be free from defects and surface imperfections which could lead to non-compliance with Clauses 4 and 5. When necessary, fittings, couplings and flange adaptors may be repaired, for example by welding, in order to remove surface imperfections and localised defects which do not extend through the entire wall thickness, provided that:  the repairs are carried out according to the manufacturer’s written procedure;  the repaired products comply with all the requirements of Clauses 4 and 5. 4.1.4 Types of joints and interconnection 4.1.4.1 General Rubber gasket materials shall comply with the requirements of EN 681-1 for the type WA. When materials other than rubber are necessary (e.g. for high temperature flanged joints), they shall comply with the appropriate European Technical Specification or, where no European Technical Specification exists, the appropriate International Standard. 4.1.4.2 Flexible joints The dimensions of sockets for push-in and mechanical, restrained and non-restrained flexible joints shall comply with 4.2.4 and with any additional requirements related to the gasket design. This ensures interconnection between all fittings and all PVC-U and PE pipes. In addition, each type of flexible joint shall be designed to fulfil the performance requirements of Clause 5. Taking into account the temperature and pressure effects on PE pipe, all joints intended for use with PE pipe shall be restrained. Supporting sleeves (inserts) may be necessary depending on pipe material, on pipe wall thickness, on joint design and on national requirements; they should provide adequate support over the entire compression area of the gasket and restraining mechanism. Where applicable, the minimum thickness of the PE pipes should be declared by the manufacturer of the fittings. 4.1.4.3 Flanged joints Flanges shall be designed such that they can be attached to flanges whose dimensions and tolerances comply with EN 1092-2. This ensures interconnection between all flanged components (pipes, fittings, valves etc.) of the same PN and DN. Bolts and nuts shall comply as a minimum with the requirements of EN ISO 4016 and EN ISO 4034, grade 4.6. Where washers are required, they shall comply with EN ISO 7091. Although it does not affect interconnection, the manufacturer shall state whether his products are normally delivered with fixed flanges or adjustable flanges. Flange gaskets may be one of any type given in EN 1514 (all parts). SIST EN 12842:2012



EN 12842:2012 (E) 10 4.1.5 Materials in contact with water intended for human consumption Components of a pipe system include several materials given in this standard. When used under the conditions for which they are designed, in permanent or in temporary contact with water intended for human consumption, ductile iron/mild steel fittings and their joints shall not change the quality of that water to such an extent that it fails to comply with the requirements of national regulations. For this purpose, reference shall be made to the relevant national regulations and standards, transposing EN standards when available, dealing with the influence of materials on water quality and to the requirements for external systems and components as given in EN 805. 4.2 Dimensional requirements 4.2.1 Minimum wall thickness of ductile iron fittings, couplings and flange adaptors The minimum wall thickness of the ductile iron, at any point, shall be as given in Table 1, provided that the requirements of 4.3, 4.6 and Clause 7 are complied with. Table 1 — Minimum wall thickness of ductile iron fittings, couplings and flange adaptors dn Minimum wall thickness mm dn ≤ 225 4 225 < dn ≤ 315 5 315 < dn ≤ 710 6 NOTE The thickness given in Table 1 is the minimum wall thickness corresponding to the main part of the body. The actual thickness at any particular point might require to be increased to meet localised high stresses depending on the shape of the casting (e.g. at internal radius of bends, at the branch-body junction of tees, etc.). 4.2.2 Minimum wall thickness of mild steel couplings and flange adaptors The minimum wall thickness of the steel, at any point, shall be as given in Table 2, provided that the requirements of 4.3, 4.6 and 7 are complied with. Table 2 — Minimum wall thickness of mild steel couplings and flange adaptors
dn Minimum wall thickness for material grade as specified in 4.3.2 mm dn ≤ 315 3 315 < dn ≤ 560 4 560 < dn ≤ 710 5 For higher grade materials, it is permissible to use thicknesses less than those specified in Table 2 with an absolute minimum of 3mm. 4.2.3 Length The lengths (see 3.23) of fittings shall be as given in the manufacturers' catalogues taking into account the minimum lengths given in the tables of Clause 8. SIST EN 12842:2012



EN 12842:2012 (E) 11 4.2.4 Dimensions of sockets The minimum internal diameter of sockets and the minimum depth of engagement of sockets shall comply with the values given in Tables 7 and 8. 4.2.5 Jointing gap for couplings and flange adaptors The manufacturer shall declare his maximum jointing gap for couplings and flange adaptors for PVC-U pipes (see Figure 1) and it shall not be less than the values given in Table 3. NOTE The jointing gap between the pipes or the flange to be connected might be affected by the pipe contraction or expansion occurring as a result of temperature or pressure change. Jointing gaps for PE pipes and restrained joints for PVC-U pipes are related to the joint design; the manufacturer shall declare these where relevant. The manufacturer shall declare the minimum depth of engagement in the jointing instructions. The minimum depth of engagement shall be such that the pipes can support the loads imparted by the jointing/anchorage system.
Key 1 maximum joint gap 2 flange adaptor 3 coupling Figure 1  Jointing gap for couplings and flange adaptors SIST EN 12842:2012



EN 12842:2012 (E) 12 Table 3  Dimensions of jointing gap for non-restrained couplings and flange adaptors for PVC-U pipes PVC-U Pipes Nominal outside diameter of pipe Coupling jointing gap Flange adaptor jointing gap dn mm mm 63 20 16 75 21 17 90 22 18 110 24 19 125 26 19 140 28 20 160 30 21 180 32 22 200 34 23 225 36 25 250 39 26 280 42 28 315 46 29 355 38 25 400 41 27 450 44 29 500 48 30 560 52 33 630 57 35 710 63 38
4.3 Material characteristics 4.3.1 Ductile iron 4.3.1.1 Tensile properties Ductile iron fittings, couplings and flange adaptors shall have a minimum tensile strength of 420 MPa and a minimum elongation after fracture of 5 %. The tensile strength shall be tested in accordance with 6.1. 4.3.1.2 Hardness The Brinell hardness, when measured in accordance with 6.2, shall not exceed 250 HBW. For components manufactured by welding, a higher Brinell hardness is allowed in the heat-affected zone of the weld. SIST EN 12842:2012



EN 12842:2012 (E) 13 4.3.2 Mild steel for couplings and flange adaptors Mild steel for couplings and flange adaptors shall comply as a minimum with the requirements of EN 10025-1:2004, grade S275. 4.3.3 Fastener for couplings and flange adaptors The maximum operating load on a fastener should not be greater than 80% of the yield strength of the fastener. Fasteners shall be suitably protected to inhibit corrosion. The following coatings may be supplied:
 polymeric (e.g. epoxy/polyamide);  zinc based corrosion protection;  PTFE;  a combination of the above.
4.4 Coatings 4.4.1 General All fittings, couplings and flange adaptors shall be delivered with an external and internal epoxy coating in compliance with EN 14901. Alternatively, the following coatings may also be supplied: a) External coatings: 1) polyamide in accordance with EN 10310; 2) polyurethane in accordance with EN 15189; 3) enamel1). b) Internal coatings (linings): 1) polyamide in accordance with EN 10310; 2) polyurethane in accordance with EN 15655; 3) enamel1). These external and internal coatings and their application process shall comply with the corresponding EN standards or, where no EN standard exists, they shall comply with ISO standards or with national standards valid in the place of use of the product, or with an agreed technical specification. All coatings shall be works-applied.
1) Enamel is a glass material containing raw material oxides fully or partly molten in the glass. This non-organic preparation can be laid in one or more layers on the metal part at a temperature higher than 480°C. SIST EN 12842:2012



EN 12842:2012 (E) 14 4.5 Marking All fi
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