Industrial valves - Shell design strength - Part 1: Tabulation method for steel valve shells

This European Standard specifies the tabulation method for determining the wall thickness of valve bodies, bonnets and covers with essentially circular cross-section made in forged, cast or fabricated steel.
For valve shells with oval, rectangular or non-circular shapes, see 8.6.
The range of PN or Class designations for which thicknesses are tabulated is:
PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class 150, Class 300,Class 600, Class 900, Class 1 500, Class 2 500, Class 4 500.
Pressure/temperature ratings are specified for each material group for the above PN Standard Class and Special Class designations.
The non-destructive examination procedures and acceptance levels that need to be applied to the valve shell components in order for the valve to be used at Special Class pressure/temperature ratings are defined.
Details are also given for the alternative rules for small bore valves of DN 65 and smaller designated as Limited Class.
This standard does not apply to threaded end valves:
- DN 80 or larger;
- or which have pressure ratings greater than Class 2 500;
- or which operate at temperatures greater than 540 °C.
Socket welding end valves DN 80 or larger are outside the scope of this standard.

Industriearmaturen - Gehäusefestigkeit - Teil 1: Tabellenverfahren für drucktragende Gehäuse von Armaturen aus Stahl

Diese Europäische Norm legt das Tabellenverfahren zur Bestimmung der Wanddicke von Armaturen¬gehäusen, Oberteilen und Deckeln mit im Wesentlichen kreisrundem Querschnitt aus Schmiedestahl, Stahlguss oder Rohstahl fest.
Drucktragende Armaturengehäuse mit ovalen, rechteckigen oder nicht runden Profilen, siehe 8.6.
Dickenwerte sind in folgendem Bereich der PN- oder Class-Bezeichnungen tabellarisch festgehalten:
PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class 150, Class 300, Class 600, Class 900, Class 1 500, Class 2 500, Class 4 500.
Für jede Werkstoffgruppe werden die Druck-/Temperatur-Zuordnungen mit Standard- und Spezial¬bezeichnung für die vorgenannten PN- oder Class-Bezeichnungen festgelegt.
Es werden die für die drucktragenden Gehäusebauteile geltenden zerstörungsfreien Prüfungen und Abnahmekriterien festgelegt, die für einen Einsatz der Armatur bei Druck-/Temperatur-Zuordnungen mit der Bezeichnung "Special Class" erforderlich sind.
Einzelheiten über die alternativen Regelungen für Armaturen mit kleiner Bohrung von höchstens DN 65, die als Limited Class bezeichnet werden, sind ebenfalls enthalten.
Die vorliegende Norm gilt nicht für Armaturen mit Gewindeanschlüssen:
-   DN 80 oder größer;
-   oder mit Druckstufen > Class 2 500;
-   oder für den Betrieb bei Temperaturen > 540 °C.
Armaturen mit Schweißmuffenenden DN 80 oder größer fallen nicht in den Anwendungsbereich dieser Norm.

Robinetterie industrielle - Résistance mécanique des enveloppes - Partie 1 : Méthode tabulaire relative aux enveloppes d'appareils de robinetterie en acier

La présente Norme européenne spécifie la méthode tabulaire qui permet de déterminer l’épaisseur de paroi des corps, chapeaux et couvercles d'appareils de robinetterie à section transversale essentiellement circulaire, fabriqués en acier forgé, moulé ou mécanosoudé.
Pour les enveloppes d’appareils de robinetterie de forme ovale, rectangulaire ou non circulaire, voir 8.6.
La gamme des désignations PN ou Class pour lesquelles les épaisseurs sont mises en tableau est la suivante :
PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class 150, Class 300, Class 600, Class 900, Class 1 500, Class 2 500, Class 4 500.
Les relations pression/température sont spécifiées pour chaque groupe de matériaux en ce qui concerne les désignations PN Class standard et Class Spécial.
Les modes opératoires des contrôles non destructifs et les critères d’acceptation qui ont besoin d'être appliqués aux composants de l’enveloppe de l’appareil de robinetterie afin de pouvoir utiliser ce dernier pour des relations pression/température Class Spécial, sont définis.
Des détails sont également fournis sur les autres règles relatives aux appareils de robinetterie à passage réduit de DN 65 et inférieur désignés en tant que Class limitées.
La présente norme ne s’applique pas aux appareils de robinetterie à extrémités filetées :
- de DN 80 ou supérieur ;
- ou qui ont des relations de pression supérieures à Class 2 500 ;
- ou qui fonctionnent à des températures supérieures à 540 °C.
Les appareils de robinetterie à extrémités à

Industrijski ventili - Trdnost ohišja - 1. del: Tabelarična metoda za ohišja jeklenih ventilov

Ta evropski standard določa tabelarično metodo za določevanje debeline stene za ohišja, pokrove in plašče ventilov s krožnim prerezom iz kovanega, litega ali izdelanega jekla.
Za ohišja ventilov z ovalnimi, pravokotnimi ali neokroglimi oblikami glej 8.6.
Nabor opredelitev PN ali Class, za katere so debeline razvrščene v preglednicah, je:
PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class 150, Class 300, Class 600, Class 900, Class 1 500, Class 2 500, Class 4 500.
Vrednosti tlaka/temperature so določene za vsako skupino materialov za zgornje opredelitve PN Standard Class in opredelitve Special Class.
Določeni so neporušitveni preiskovalni postopki in stopnje sprejemljivosti, ki jih je treba uporabljati za sestavne dele ohišij ventilov, da se lahko ventil uporablja pri vrednosti temperature/tlaka Special Class.
Podane so tudi podrobnosti za alternativna pravila za ventile z majhnim premerom velikosti DN 65 in manjše z oznako Limited Class.
Ta standard se ne uporablja za ventile z navojnim nastavkom:
– velikosti DN 80 ali večje;
– z višjimi vrednostmi tlaka kot pri razredu Class 2 500;
– ki se uporabljajo pri temperaturi, višji od 540 °C.
Ventili z notranjim varilnim nastavkom velikosti DN 80 ali večji so zunaj področja uporabe tega standarda.

General Information

Status
Published
Publication Date
11-Nov-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
15-Oct-2018
Due Date
20-Dec-2018
Completion Date
12-Nov-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.YHQWLORYIndustriearmaturen - Gehäusefestigkeit - Teil 1: Tabellenverfahren für drucktragende Gehäuse von Armaturen aus StahlRobinetterie industrielle - Résistance mécanique des enveloppes - Partie 1 : Méthode tabulaire relative aux enveloppes d'appareils de robinetterie en acierIndustrial valves - Shell design strength - Part 1: Tabulation method for steel valve shells23.060.01Ventili na splošnoValves in generalICS:Ta slovenski standard je istoveten z:EN 12516-1:2014+A1:2018SIST EN 12516-1:2015+A1:2018en,fr,de01-december-2018SIST EN 12516-1:2015+A1:2018SLOVENSKI

STANDARDSIST EN 12516-1:20151DGRPHãþD
SIST EN 12516-1:2015+A1:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12516-1:2014+A1
September
t r s z ICS
t uä r x rä r s Supersedes EN
s t w s xæ sã t r s vEnglish Version
Industrial valves æ Shell design strength æ Part

sã Tabulation method for steel valve shells Robinetterie industrielle æ Résistance mécanique des enveloppes æ Partie

s ã Méthode tabulaire relative aux enveloppes d 5appareils de robinetterie en acier

Industriearmaturen æ Gehäusefestigkeit æ Teil

sã Tabellenverfahren für drucktragende Gehäuse von Armaturen aus Stahl This European Standard was approved by CEN on

{ August
t r s v and includes Amendment
s approved by CEN on
s x March
t r s zä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s t w s xæ sã t r s v ªA sã t r s z ESIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 5 Introduction .................................................................................................................................................................... 7 1 Scope .................................................................................................................................................................... 9 2 Normative references .................................................................................................................................... 9 3 Terms and definitions ................................................................................................................................ 10 4 Symbols and units ........................................................................................................................................ 11 5 Material groups and material temperature limitations ................................................................ 12 6 Pressure/temperature (p/t) ratings ..................................................................................................... 12 6.1 General ............................................................................................................................................................. 12 6.2 Standard rating ............................................................................................................................................. 12 6.3 Special Class ................................................................................................................................................... 12 6.4 Limited Class .................................................................................................................................................. 12 6.5 Intermediate ratings ................................................................................................................................... 12 6.6 Flanged ratings.............................................................................................................................................. 12 7 Temperature effects .................................................................................................................................... 13 7.1 Temperature limits ..................................................................................................................................... 13 7.2 Fluid thermal expansion ............................................................................................................................ 13 8 Dimensions ..................................................................................................................................................... 13 8.1 Minimum wall thickness ............................................................................................................................ 13 8.2 Inside diameter ............................................................................................................................................. 13 8.3 Valve body necks .......................................................................................................................................... 14 8.4 Local areas ...................................................................................................................................................... 16 8.5 Contours at body ends ................................................................................................................................ 16 8.5.1 Butt welding ends ........................................................................................................................................ 16 8.5.2 Socket welding and threaded ends ........................................................................................................ 16 8.6 Additional metal thickness ....................................................................................................................... 17 8.7 Bonnets, cover and connections ............................................................................................................. 17 8.8 Wafer or flangeless valves ........................................................................................................................ 17 9 Auxiliary connections ................................................................................................................................. 19 9.1 General ............................................................................................................................................................. 19 9.2 Pipe thread tapping ..................................................................................................................................... 19 9.3 Socket welding .............................................................................................................................................. 19 9.4 Butt welding ................................................................................................................................................... 20 9.5 Bosses ............................................................................................................................................................... 20 10 End dimensions ............................................................................................................................................. 21 10.1 Flanged ends .................................................................................................................................................. 21 10.2 Butt welding ends ........................................................................................................................................ 21 10.3 Socket welding ends .................................................................................................................................... 21 10.4 Threaded ends............................................................................................................................................... 21 10.5 Intermediate rated socket welding and threaded ends ................................................................. 21 11 Marking ............................................................................................................................................................ 21 11.1 Standard rating valves ............................................................................................................................... 21 SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 3 11.2 Special Class valves ...................................................................................................................................... 21 11.3 Limited Class valves ..................................................................................................................................... 22 11.4 Intermediate rating valves ........................................................................................................................ 22 Annex A (normative)

Methods used for establishing pressure/temperature ratings...................... 72 A.1 Minimum wall thickness ............................................................................................................................ 72 A.2 Material properties ...................................................................................................................................... 73 A.3 Pressure/temperature ratings ................................................................................................................ 74 A.3.1 General ............................................................................................................................................................. 74 A.3.2 Selected stress values for steels from group 3E0 to 9E1 ................................................................ 75 A.3.3 Selected stress values for steels from group 10E0 to 16E0 ........................................................... 75 A.3.4 Maximum ratings .......................................................................................................................................... 75 Annex B (informative)

Material groups ............................................................................................................. 76 Annex C (informative)

Special Class .................................................................................................................... 78 C.1 General ............................................................................................................................................................. 78 C.2 Required examination ................................................................................................................................ 78 C.2.1 Castings ............................................................................................................................................................ 78 C.2.2 Forgings, bars, plates and tubular products ....................................................................................... 80 C.2.3 Drop forgings.................................................................................................................................................. 81 C.2.4 Welded fabrication ....................................................................................................................................... 81 C.2.5 Defect removal and repair — Repair by welding .............................................................................. 81 C.3 Method for establishing Special rating ................................................................................................. 87 C.3.1 Methods for all materials ........................................................................................................................... 87 C.3.2 Special ratings ................................................................................................................................................ 88 Annex D (informative)

Radiographic procedure and acceptance standards .................................... 108 D.1 Radiographic procedure ......................................................................................................................... 108 D.2 Acceptance standards .............................................................................................................................. 109 Annex E (informative)

Magnetic particle examination procedure and acceptance standards .. 110 E.1 General .......................................................................................................................................................... 110 E.2 Acceptance standards .............................................................................................................................. 110 E.2.1 Castings ......................................................................................................................................................... 110 E.2.2 Forgings and rolled or wrought material and drop forgings ..................................................... 110 Annex F (informative)

Liquid penetrant examination procedure and acceptance standards ... 112 F.1 Procedure ..................................................................................................................................................... 112 F.2 Acceptance criteria ................................................................................................................................... 112 F.2.1 Castings ......................................................................................................................................................... 112 F.2.2 Forgings, rolled or wrought material and drop forgings ............................................................ 112 Annex G (informative)

Ultrasonic examination procedure and acceptance standards ................ 113 G.1 Procedure for forgings and rolled or wrought material ............................................................. 113 G.1.1 General .......................................................................................................................................................... 113 G.1.2 Extent of examination .............................................................................................................................. 113 G.1.3 Acceptance standards .............................................................................................................................. 113 G.2 Procedure for castings ............................................................................................................................. 113 G.2.1 General .......................................................................................................................................................... 113 G.2.2 Extent of examination .............................................................................................................................. 113 G.2.3 Acceptance standards .............................................................................................................................. 113 Annex H (informative)

Requirement for Limited Class valves in sizes DN 65 and smaller ......... 114 H.1 General .......................................................................................................................................................... 114 H.2 Limited Class rating method .................................................................................................................. 114 H.3 Dimensions .................................................................................................................................................. 115 SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 4 H.3.1 General ........................................................................................................................................................... 115 H.3.2 Inside diameter ........................................................................................................................................... 115 H.3.3 Wall thickness ............................................................................................................................................. 115 H.3.4 Valve body necks ........................................................................................................................................ 115 H.3.5 Contours for body run transitions ....................................................................................................... 115 H.3.6 Additional metal thickness ..................................................................................................................... 115 H.3.7 Welded fabrication .................................................................................................................................... 116 Annex I (informative)

ASTM/ASME material ................................................................................................ 117 I.1 General ........................................................................................................................................................... 117 I.2 Material groups ........................................................................................................................................... 117 I.3 Minimum wall thickness .......................................................................................................................... 118 I.4 Material properties ................................................................................................................................... 118 I.5 Pressure/temperature ratings .............................................................................................................. 118 I.5.1 Standard rating ........................................................................................................................................... 118 I.5.2 Special rating ............................................................................................................................................... 118 Annex J (informative)

Relationship between DN, NPS, pipe inside diameter Dni, pipe outside diameter OD ................................................................................................................................................. 196 Annex ZA (informative)

Relationship between this European Standard and the essential requirements of Directive 2014/68/EU (PED) aimed to be covered ...................................... 200 Bibliography ............................................................................................................................................................... 201

SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 5 European foreword This document (EN 12516-1:2014+A1:2018) has been prepared by Technical Committee CEN/TC 69 "Industrial valves", 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 March 2019, and conflicting national standards shall be withdrawn at the latest by March 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1 approved by CEN on 2018-03-16. This document supersedes !EN 12516-1:2014". The start and finish of text introduced or altered by amendment is indicated in the text by tags !". This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of !EU Directive 2014/68/EU". For relationship with !EU Directive 2014/68/EU", see informative Annex ZA, which is an integral part of this document. EN 12516 comprises the following parts: — Industrial valves — Shell design strength — Part 1: Tabulation method for steel valve shells; — Industrial valves — Shell design strength — Part 2: Calculation method for steel valve shells; — Valves — Shell design strength — Part 3: Experimental method; — Industrial valves — Shell design strength — Part 4: Calculation method for valve shells manufactured in metallic materials other than steel. The main changes between EN 12516-1:2005 and EN 12516-1:2014 are listed below: a) addition of new PN values PN 160, PN 250, PN 320, PN 400; b) B designation rating have been replaced by the PN designation; c) B20 rating values have been replaced by Class 150 and use of the calculation method given in ASME B16.34; d) new PN values have been added to Table 7 for the valve body minimum wall thickness values; e) material tables have been updated to be in line with EN 1092-1 for the EN materials; f) materials 1.0345 and 1.4458 have been deleted; g) Annex B material groups has been updated and made normative; SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 6 h) special Class in EN material have been moved to an informative Annex C; i) EN materials properties for pressure temperature calculation have been modified (Rm/3,5) to be consistent with the new ASME rules, and using Rp1 % for stainless steel consistent with EN 12516-2; j) ASTM material properties used for rating calculation have been updated to the new ASME B16.34 rules; k) in the pressure-temperature calculation formula the stress factor S has been changed to 120,7 MPa in order to get a Ps of 775,7 bar which is the ceiling pressure when calculating the Special Class 4 500; l) pressure/temperature ratings have been recalculated. For PN values they are now limited to the PN number; this has been done by increasing the Pc value in the pressure rating calculation method consequently the wall thickness for the PN designation has been increased; m) Annexes D, E, F, G for NDE have been updated to the new EN standards and made informative; n) Annex H limited Class has been made informative; o) ASTM/ASME materials have been moved to an informative Annex I; p) an informative Annex J on the relationship between DN, NPS, pipe inside diameter and outside diameter has been added; q) Annex ZA has been updated. 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 7 Introduction EN 12516, Industrial valves — Shell design strength, is in four parts. EN 12516-1 and EN 12516-2 specify methods for determining the thickness of steel valve shells by tabulation or calculation methods respectively. EN 12516-3 establishes an experimental method for assessing the strength of valve shells in steel, cast iron and copper alloy as a type test by applying an elevated hydrostatic pressure at ambient temperature. EN 12516-4 specifies method for calculating the thickness for valve shells in metallic material other than steel. The tabulation method, EN 12516-1, is similar in approach to ASME B16.34 in that the designer can look up the required minimum wall thickness dimension of the valve body from a table. The internal diameter of the inlet bore of the valve, gives the reference dimension from which the tabulated wall thickness of the body are calculated. It applies only to valve bodies, bonnets and covers with essentially circular cross-section. For valve shells with oval or rectangular shapes and for additional loads, EN 12516-2 should be used (see 8.6). The calculation method, EN 12516-2 is similar in approach to the former DIN 3840 where the designer is required to calculate the wall thickness for each point on the pressure temperature curve using the allowable stress at that temperature for the material he has chosen. The allowable stress is calculated from the material properties using the safety factors that are defined in EN 12516-2. The formulae in EN 12516-2 consider the valve as a pressure vessel and ensure that there will be no excessive deformation or plastic instability. EN 12516-1 specifies Standard and Special pressure/temperature ratings for valve shells with bodies having the tabulated thickness. The tabulation method gives one thickness for the body for each PN (see 3.1) or Class designation depending only on the inside diameter, Di, of the body at the point where the thickness is to be determined. The thicknesses are calculated using the thin cylinder formula that is also used in EN 12516-2. The allowable stress used in the formula is equal to 120,7 MPa and the calculation pressure Pc varies according PN and Class designation. For the Class designations, the rules for determining the pressure/temperature ratings are the same for both valve shells and flanges. For PN designations rules for determining the pressure /temperature ratings are different for flanges and for valves, but this revision of the standard has adjusted the rules to get at room temperature the same pressure. The change of pressure in temperature needs to be taken into account by the piping/assembler. The main reasons for the differences are due to the treatment of ceiling values. In PN flanges, a constant ceiling stress of 140 MPa at room temperature is applied. In PN and Class designations, the EN 12516-1 ceiling criteria apply, which are temperature dependent. The reason for the down rating of Standard rating values relative to Special rating is that the Standard rating body is not subject to the specified non-destructive examination procedures and acceptance levels. The thicknesses for all designations are approximately proportional to the Class 4 500 thickness in the ratio of the pressures. This standard tabulates the commonly used ratings. It is possible to design shells to suit particular applications or markets using intermediate ratings. This data can be obtained using linear interpolation of the tabulated data in EN 12516-1. A merit of the tabulation method, which has a fixed set of shell dimensions irrespective of the material of the shell, is that it is possible to have common patterns and forging dies. The allowable SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 8 pressure/temperature rating for each material group varies proportional to the selected stresses of the material group to which the material belong. A merit of the calculation method is that it allows the most efficient design for a specific application using the allowable stresses for the actual material selected for the application. The two methods are based on different assumptions, and as a consequence the detail analysis is different. Both methods offer a safe and proven method of designing pressure-bearing components of valve shells. SIST EN 12516-1:2015+A1:2018

EN 12516-1:2014+A1:2018 (E) 9 1 Scope This European Standard specifies the tabulation method for determining the wall thickness of valve bodies, bonnets and covers with essentially circular cross-section made in forged, cast or fabricated steel. For valve shells with oval, rectangular or non-circular shapes, see 8.6. The range of PN or Class designations for which thicknesses are tabulated is: PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class 150, Class 300,Class 600, Class 900, Class 1 500, Class 2 500, Class 4 500. Pressure/temperature ratings are specified for each material group for the above PN Standard Class and Special Class designations. The non-destructive examination procedures and acceptance levels that need to be applied to the valve shell components in order for the valve to be used at Special Class pressure/temperature ratings are defined. Details are also given for the alternative rules for small bore valves of DN 65 and smaller designated as Limited Class. This standard does not apply to threaded end valves: — DN 80 or larger; — or which have pressure ratings greater than Class 2 500; — or which operate at temperatures greater than 540 °C. Socket welding end valves DN 80 or larger are outside the scope of this standard. 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 d

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