Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific inspection requirements

This draft European Standard specifies the technical delivery requirements for seamless and welded butt welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of carbon and alloy steel in two test categories which are intended for pressure purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission and distribution of fluids and gases.
It specifies:
a)   type of fittings;
1)   type A: Butt-welding fittings with reduced pressure factor;
2)   type B: Butt-welding fittings for use at full service pressure;
b)   steel grades and their chemical compositions;
c)   mechanical properties;
d)   dimensions and tolerances;
e)   requirements for inspection and testing;
f)   inspection documents;
g)   marking;
h)   protection and packaging.
NOTE   In the case of a harmonised supporting standard for materials, presumption of conformity to the ESRs is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently it is essential that the technical data stated in the material standard be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.

Formstücke zum Einschweißen - Teil 2: Unlegierte und legierte ferritische Stähle mit besonderen Prüfanforderungen

Dieser Norm-Entwurf legt die technischen Lieferbedingungen für nahtlose und geschweißte Formstücke zum Einschweißen (Rohrbogen, konzentrische und exzentrische Reduzierstücke, T-Stücke mit gleichem Abzweig und mit reduziertem Abzweig, Kappen) aus unlegiertem und legiertem Stahl in zwei Prüfkategorien fest, die für Druckbeanspruchungen bei Raumtemperatur, Niedrigtemperatur oder bei erhöhter Temperatur sowie für die Weiterleitung und Verteilung von Fluiden und Gasen vorgesehen sind.
Diese Norm legt fest:
a)   die Bauart der Formstücke;
1)   Bauart A: Formstücke zum Einschweißen, verminderter Ausnutzungsgrad;
2)   Bauart B: Formstücke zum Einschweißen, voller Ausnutzungsgrad;
b)   Stahlsorten und ihre chemische Zusammensetzung;
c)   die mechanischen Eigenschaften;
d)   die Maße und Grenzabmaße;
e)   die Anforderungen an die Prüfungen;
f)   die Prüfbescheinigungen;
g)   die Kennzeichnung;
h)   die Schutzmaßnahmen und Verpackung.
ANMERKUNG   Im Falle einer harmonisierten unterstützenden Norm für Werkstoffe beschränkt sich die Vermutung der Konformität mit den grundlegenden Sicherheitsanforderungen auf die in der Norm genannten technischen Daten für Werkstoffe und bedeutet nicht, dass davon ausgegangen wird, dass der Werkstoff für ein bestimmtes Gerät angemessen ist. Somit sind die in der Werkstoffnorm angegebenen technischen Daten im Hinblick auf die Anforderungen an die Auslegung des betreffenden Geräts zu bewerten, um sicherzustellen, dass die grundlegenden Sicherheitsanforderungen der Druckgeräterichtlinie (DGRL) erfüllt sind.

Raccords à souder bout à bout - Partie 2 : Aciers non alliés et aciers ferritiques alliés avec contrôle spécifique

Le présent projet de Norme européenne spécifie les exigences techniques de livraison des raccords à souder bout à bout, sans soudure et soudés (coudes, réductions concentriques et excentriques, tés égaux et réduits, et caps), en acier au carbone et allié dans deux catégories d'essai, destinés à des usages sous pression à température ambiante, à basse température ou à température élevée, ainsi qu’au transport et à la distribution des fluides et des gaz.
Elle spécifie :
a)   le type de raccords ;
1)      type A : Raccords à souder bout à bout à facteur de pression réduit ;
2)      type B : Raccords à souder bout à bout pour utilisation à pleine pression de service ;
b)   les nuances d'acier et leur composition chimique ;
c)   les propriétés mécaniques ;
d)   les dimensions et tolérances ;
e)   les exigences en matière de contrôle et d'essai ;
f)   les documents de contrôle ;
g)   le marquage ;
h)   la protection et l'emballage.
NOTE   Dans le cas des normes de support harmonisées pour les matériaux, la présomption de conformité aux exigences essentielles de sécurité est limitée aux données techniques des matériaux de la norme et ne suppose pas l'adéquation du matériau à un élément spécifique du matériel. Par conséquent, il est essentiel d'évaluer les données techniques présentées dans la norme du matériau en fonction des exigences de conception de l'élément spécifique du matériel de façon à vérifier que les exigences essentielles de sécurité de la PED sont satisfaites.

Cevni fitingi za soležne zvare - 2. del: Nelegirana in feritna legirana jekla s posebnimi zahtevami kontrole

General Information

Status
Published
Public Enquiry End Date
31-Jan-2018
Publication Date
24-Aug-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Aug-2021
Due Date
24-Oct-2021
Completion Date
25-Aug-2021

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SLOVENSKI STANDARD
SIST EN 10253-2:2021
01-oktober-2021
Nadomešča:
SIST EN 10253-2:2008
Cevni fitingi za soležne zvare - 2. del: Nelegirana in feritna legirana jekla s
posebnimi zahtevami kontrole

Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific

inspection requirements

Formstücke zum Einschweißen - Teil 2: Unlegierte und legierte ferritische Stähle mit

besonderen Prüfanforderungen

Raccords à souder bout à bout - Partie 2 : Aciers non alliés et aciers ferritiques alliés

avec contrôle spécifique
Ta slovenski standard je istoveten z: EN 10253-2:2021
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.140.20 Visokokakovostna jekla Stainless steels
77.140.45 Nelegirana jekla Non-alloyed steels
SIST EN 10253-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 10253-2:2021
---------------------- Page: 2 ----------------------
SIST EN 10253-2:2021
EN 10253-2
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2021
EUROPÄISCHE NORM
ICS 77.140.20; 23.040.40; 77.140.45 Supersedes EN 10253-2:2007
English Version
Butt-welding pipe fittings - Part 2: Non alloy and ferritic
alloy steels with specific inspection requirements

Raccords à souder bout à bout - Partie 2 : Aciers non Formstücke zum Einschweißen - Teil 2: Unlegierte und

alliés et aciers ferritiques alliés avec contrôle legierte ferritische Stähle mit besonderen

spécifique Prüfanforderungen
This European Standard was approved by CEN on 30 May 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10253-2:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 6

Introduction .................................................................................................................................................................... 8

1 Scope .................................................................................................................................................................... 9

2 Normative references .................................................................................................................................... 9

3 Terms and definitions ................................................................................................................................ 13

4 Symbols and abbreviations ...................................................................................................................... 14

5 Classification and designation ................................................................................................................. 15

5.1 Classification of grades .............................................................................................................................. 15

5.2 Designation of steel grades ....................................................................................................................... 15

5.3 Designation of fittings ................................................................................................................................ 15

5.3.1 General ............................................................................................................................................................. 15

5.3.2 Elbows and return bends .......................................................................................................................... 15

5.3.3 Reducers .......................................................................................................................................................... 15

5.3.4 Tees ................................................................................................................................................................... 16

5.3.5 Caps ................................................................................................................................................................... 16

6 Information to be supplied by the purchaser .................................................................................... 16

6.1 Mandatory information ............................................................................................................................. 16

6.2 Options ............................................................................................................................................................. 16

6.3 Examples of an order .................................................................................................................................. 18

6.3.1 Example 1 ........................................................................................................................................................ 18

6.3.2 Example 2 ........................................................................................................................................................ 18

6.3.3 Example 3 ........................................................................................................................................................ 18

6.3.4 Example 4 ........................................................................................................................................................ 18

6.3.5 Example 5 ........................................................................................................................................................ 18

7 Resistance to internal pressure .............................................................................................................. 19

7.1 General ............................................................................................................................................................. 19

7.2 Fittings of type A ........................................................................................................................................... 19

7.3 Fittings of type B ........................................................................................................................................... 19

8 Manufacturing process ............................................................................................................................... 19

8.1 Steelmaking process ................................................................................................................................... 19

8.2 Product making process for fittings and heat treatment .............................................................. 19

8.2.1 Product making process ............................................................................................................................ 19

8.2.2 Welding ............................................................................................................................................................ 20

8.2.3 Heat treatment condition .......................................................................................................................... 21

9 Technical requirements............................................................................................................................. 23

9.1 General ............................................................................................................................................................. 23

9.2 Chemical composition ................................................................................................................................ 23

9.2.1 Cast analysis ................................................................................................................................................... 23

9.2.2 Product analysis ........................................................................................................................................... 23

9.3 Mechanical properties ................................................................................................................................ 27

9.4 Creep rupture strength values ................................................................................................................ 34

9.5 Weldability ..................................................................................................................................................... 34

10 Appearance and internal soundness (delivery conditions) ......................................................... 34

---------------------- Page: 4 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)

10.1 Definitions of surface imperfections ..................................................................................................... 34

10.2 Appearance ..................................................................................................................................................... 36

10.3 Internal soundness ...................................................................................................................................... 36

11 Dimensions and tolerances ....................................................................................................................... 36

11.1 Dimensions ..................................................................................................................................................... 36

11.1.1 General ............................................................................................................................................................. 36

11.1.2 Elbows ............................................................................................................................................................... 37

11.1.3 Tees .................................................................................................................................................................... 37

11.1.4 Reducers .......................................................................................................................................................... 38

11.1.5 Caps .................................................................................................................................................................... 39

11.1.6 Preferred diameters and wall thicknesses .......................................................................................... 39

11.2 Dimensional tolerances .............................................................................................................................. 41

11.2.1 Diameter .......................................................................................................................................................... 41

11.2.2 Out of roundness ........................................................................................................................................... 41

11.2.3 Wall thickness tolerances .......................................................................................................................... 42

11.2.4 Tolerances on specific dimensions and form ..................................................................................... 42

11.2.5 Corrugation ..................................................................................................................................................... 43

11.3 Performance of the end bevelling ........................................................................................................... 44

12 Inspection ........................................................................................................................................................ 45

12.1 Type of inspection ........................................................................................................................................ 45

12.2 Inspection documents ................................................................................................................................. 45

12.2.1 Type of inspection documents ................................................................................................................. 45

12.2.2 Content of inspection documents ........................................................................................................... 45

12.3 Summary of inspection and testing ........................................................................................................ 46

13 Sampling .......................................................................................................................................................... 48

13.1 Frequency of tests ......................................................................................................................................... 48

13.1.1 Test unit ........................................................................................................................................................... 48

13.1.2 Number of test pieces per test unit ........................................................................................................ 49

13.2 Preparation of samples and test pieces ................................................................................................ 49

13.2.1 Samples for product analysis ................................................................................................................... 49

13.2.2 Samples and test pieces for mechanical tests..................................................................................... 50

13.2.3 Test piece for the tensile test on the base material.......................................................................... 50

13.2.4 Test piece for the tensile test transverse to the weld ...................................................................... 50

13.2.5 Test piece for the weld bend test ............................................................................................................ 50

13.2.6 Test piece for the impact test ................................................................................................................... 50

14 Test methods .................................................................................................................................................. 51

14.1 Chemical analysis ......................................................................................................................................... 51

14.2 Tensile test on the base material ............................................................................................................ 51

14.2.1 At room temperature .................................................................................................................................. 51

14.2.2 At elevated temperature ............................................................................................................................ 51

14.3 Transverse tensile test on the weld ....................................................................................................... 51

14.4 Hardness test .................................................................................................................................................. 51

14.5 Weld bend test ............................................................................................................................................... 52

14.6 Impact testing ................................................................................................................................................ 52

14.7 Dimensional testing ..................................................................................................................................... 53

14.8 Visual testing (VT) ........................................................................................................................................ 53

14.9 Non-destructive testing (NDT) ................................................................................................................. 53

14.9.1 Personnel ......................................................................................................................................................... 53

14.9.2 NDT of the weld ............................................................................................................................................. 53

14.9.3 NDT of cold formed tees ............................................................................................................................. 53

14.9.4 NDT for the detection of laminar imperfections ............................................................................... 54

---------------------- Page: 5 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)

14.9.5 NDT for the detection of longitudinal imperfections ...................................................................... 54

14.9.6 NDT for the detection of transverse imperfections ......................................................................... 54

14.9.7 NDT of bars and forgings ........................................................................................................................... 54

14.10 Positive material identification (PMI) .................................................................................................. 54

15 Marking ............................................................................................................................................................ 55

16 Protection and packaging ......................................................................................................................... 56

Annex A (normative) Dimensions ......................................................................................................................... 57

A.1 General ............................................................................................................................................................. 57

A.2 Elbows .............................................................................................................................................................. 57

A.3 Tees ................................................................................................................................................................... 59

A.4 Reducers .......................................................................................................................................................... 61

A.5 Caps ................................................................................................................................................................... 63

Annex B (normative) Determination of pressure factors and wall thickness ...................................... 65

B.1 General ............................................................................................................................................................. 65

B.2 Symbols and units ........................................................................................................................................ 65

B.3 Minimal and nominal wall thickness .................................................................................................... 68

B.4 Pressure factors of fittings of type A ..................................................................................................... 68

B.4.1 General ............................................................................................................................................................. 68

B.4.2 Pressure factor .............................................................................................................................................. 68

B.4.3 Elbows .............................................................................................................................................................. 69

B.4.4 Tees ................................................................................................................................................................... 69

B.4.5 Reducers .......................................................................................................................................................... 72

B.4.6 Caps ................................................................................................................................................................... 77

B.5 Wall thicknesses of fittings of type B .................................................................................................... 79

B.5.1 General ............................................................................................................................................................. 79

B.5.2 Elbows .............................................................................................................................................................. 79

B.5.3 Tees ................................................................................................................................................................... 80

B.5.4 Reducers .......................................................................................................................................................... 83

B.5.5 Caps ................................................................................................................................................................... 87

Annex C (normative) Pressure factor tables for Fittings of type A ............................................................ 89

C.1 General ............................................................................................................................................................. 89

C.2 Elbows .............................................................................................................................................................. 89

C.3 Tees ................................................................................................................................................................... 92

C.4 Reducers .......................................................................................................................................................... 99

C.5 Caps ................................................................................................................................................................. 108

Annex D (informative) Wall thickness tables for fittings of type B ......................................................... 109

D.1 General ........................................................................................................................................................... 109

---------------------- Page: 6 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)

D.2 Elbows ............................................................................................................................................................ 109

D.3 Tees ................................................................................................................................................................. 112

D.4 Reducers ....................................................................................................................................................... 121

D.5 Caps ................................................................................................................................................................. 136

Annex E (informative) Recommended heat treatment temperatures................................................... 137

Annex F (informative) Creep rupture strength values ................................................................................ 138

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2014/68/EU..................................................................................... 143

Bibliography .............................................................................................................................................................. 145

---------------------- Page: 7 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)
European foreword

This document (EN 10253-2:2021) has been prepared by Technical Committee CEN/TC 459 “ECISS -

European Committee for Iron and Steel Standardization”, 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 2022, and conflicting national standards

shall be withdrawn at the latest by February 2022.

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 supersedes EN 10253-2:2007.
The main changes compared to the previous edition are listed below:
a) Document technically and editorially revised;
b) Updating of Clause 2 “Normative References”;
c) Revision of chemical composition and steel grades;

d) Revision of permissible deviations of the product analysis from specified limits on cast analysis;

e) Revision of mechanical properties;
f) Revision of minimum proof strength including minimum wall thickness;
g) Revision of impact properties including minimum requirements;
h) Revision of fitting dimensions and moving to new Annex A;
i) Addition of creep rupture strength values;
j) Revision of inspection and tests;
k) Revision of pressure factors;

l) Updating of Annex ZA to follow new EU Directive 2014/68/EU for pressure equipment;

m) Updating of the Bibliography.

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, see informative Annex ZA, which is an integral part of this

document.
---------------------- Page: 8 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)

EN 10253 comprises a series of European Standards about Butt-welding pipe fittings, namely:

— Part 1: Wrought carbon steel for general use and without specific inspection requirements;

— Part 2: Non alloy and ferritic alloy steels with specific inspection requirements;

— Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection

requirements;

— Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection

requirements.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 9 ----------------------
SIST EN 10253-2:2021
EN 10253-2:2021 (E)
Introduction

In writing this document the competent committee recognized that there are two broad types of

products commonly used, and decided to reflect these in the standard by differentiating between two

parts.

EN 10253-1 describes fittings without formal reference to the pressure resistance, which are not

intended to be used in applications, covered by the Pressure Equipment Directive (2014/68/EU)

categories I to IV.

EN 10253-2 defines two types of fittings: Type A fittings have the same wall thickness at the welding

ends and at the body of the fitting as a pipe having the same specif
...

SLOVENSKI STANDARD
oSIST prEN 10253-2:2018
01-januar-2018
Cevni fitingi za soležne zvare - 2. del: Nelegirana in feritna legirana jekla s
posebnimi zahtevami kontrole

Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific

inspection requirements

Formstücke zum Einschweißen - Teil 2: Unlegierte und legierte ferritische Stähle mit

besonderen Prüfanforderungen

Raccords à souder bout à bout - Partie 2 : Aciers non alliés et aciers ferritiques alliés

avec contrôle spécifique
Ta slovenski standard je istoveten z: prEN 10253-2
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.140.20 Visokokakovostna jekla Stainless steels
77.140.45 Nelegirana jekla Non-alloyed steels
oSIST prEN 10253-2:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 10253-2:2018
---------------------- Page: 2 ----------------------
oSIST prEN 10253-2:2018
DRAFT
EUROPEAN STANDARD
prEN 10253-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2017
ICS 77.140.20; 23.040.40; 77.140.45 Will supersede EN 10253-2:2007
English Version
Butt-welding pipe fittings - Part 2: Non alloy and ferritic
alloy steels with specific inspection requirements

Raccords à souder bout à bout - Partie 2 : Aciers non Formstücke zum Einschweißen - Teil 2: Unlegierte und

alliés et aciers ferritiques alliés avec contrôle legierte ferritische Stähle mit besonderen

spécifique Prüfanforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

ECISS/TC 110.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10253-2:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................ 10

4 Symbols and abbreviations ...................................................................................................................... 11

5 Classification of grades and designation ............................................................................................. 12

5.1 Classification of grades .............................................................................................................................. 12

5.2 Designation of steel grades ....................................................................................................................... 12

5.3 Designation of fittings ................................................................................................................................ 12

5.3.1 General ............................................................................................................................................................. 12

5.3.2 Elbows and return bends .......................................................................................................................... 12

5.3.3 Reducers .......................................................................................................................................................... 12

5.3.4 Tees ................................................................................................................................................................... 13

5.3.5 Caps ................................................................................................................................................................... 13

6 Information to be supplied by the purchaser .................................................................................... 13

6.1 Mandatory information ............................................................................................................................. 13

6.2 Options ............................................................................................................................................................. 13

6.3 Examples of an order .................................................................................................................................. 15

6.3.1 Example 1 ........................................................................................................................................................ 15

6.3.2 Example 2 ........................................................................................................................................................ 15

6.3.3 Example 3 ........................................................................................................................................................ 15

6.3.4 Example 4 ........................................................................................................................................................ 15

6.3.5 Example 5 ........................................................................................................................................................ 15

7 Resistance to internal pressure .............................................................................................................. 15

7.1 General ............................................................................................................................................................. 15

7.2 Fittings of type A ........................................................................................................................................... 16

7.3 Fittings of type B ........................................................................................................................................... 16

8 Manufacturing process ............................................................................................................................... 16

8.1 Steelmaking process ................................................................................................................................... 16

8.2 Product making process for fittings and heat treatment .............................................................. 16

8.2.1 Product making process ............................................................................................................................ 16

8.2.2 Welding as part of the manufacturing process of the fitting ........................................................ 17

8.2.3 Heat treatment condition .......................................................................................................................... 18

9 Technical requirements............................................................................................................................. 19

9.1 General ............................................................................................................................................................. 19

9.2 Chemical composition ................................................................................................................................ 20

9.2.1 Cast analysis ................................................................................................................................................... 20

9.2.2 Product analysis ........................................................................................................................................... 20

9.3 Mechanical properties ................................................................................................................................ 25

9.4 Creep rupture strength values ................................................................................................................ 34

9.5 Weldability ..................................................................................................................................................... 34

10 Appearance and internal soundness (delivery conditions) ......................................................... 34

---------------------- Page: 4 ----------------------
oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)

10.1 Definitions of imperfections ..................................................................................................................... 34

10.2 Appearance ..................................................................................................................................................... 36

10.3 Internal soundness ...................................................................................................................................... 36

11 Dimensions and tolerances ....................................................................................................................... 36

11.1 Dimensions ..................................................................................................................................................... 36

11.1.1 General ............................................................................................................................................................. 36

11.1.2 Elbows ............................................................................................................................................................... 37

11.1.3 Tees .................................................................................................................................................................... 37

11.1.4 Reducers .......................................................................................................................................................... 38

11.1.5 Caps .................................................................................................................................................................... 39

11.1.6 Preferred diameters and wall thicknesses .......................................................................................... 39

11.2 Dimensional tolerances .............................................................................................................................. 41

11.2.1 Diameter .......................................................................................................................................................... 41

11.2.2 Out of roundness ........................................................................................................................................... 42

11.2.3 Wall thickness tolerances .......................................................................................................................... 42

11.2.4 Tolerances on specific dimensions and form ..................................................................................... 42

11.2.5 Corrugation ..................................................................................................................................................... 43

11.3 Performance of the end bevelling ........................................................................................................... 44

12 Inspection ........................................................................................................................................................ 45

12.1 Type of inspection ........................................................................................................................................ 45

12.2 Inspection documents ................................................................................................................................. 45

12.2.1 Type of inspection documents ................................................................................................................. 45

12.2.2 Content of inspection documents ........................................................................................................... 45

12.3 Summary of inspection and testing ........................................................................................................ 46

13 Sampling .......................................................................................................................................................... 47

13.1 Frequency of tests ......................................................................................................................................... 47

13.1.1 Test unit ........................................................................................................................................................... 47

13.1.2 Number of test pieces per test unit ........................................................................................................ 49

13.2 Preparation of samples and test pieces ................................................................................................ 49

13.2.1 Samples for product analysis ................................................................................................................... 49

13.2.2 Samples and test pieces for mechanical tests..................................................................................... 49

13.2.3 Test piece for the tensile test on the base material.......................................................................... 49

13.2.4 Test piece for the tensile test transverse to the weld ...................................................................... 49

13.2.5 Test piece for the weld bend test ............................................................................................................ 49

13.2.6 Test piece for the impact test ................................................................................................................... 49

14 Test methods .................................................................................................................................................. 50

14.1 Chemical analysis ......................................................................................................................................... 50

14.2 Tensile test on the base material ............................................................................................................ 50

14.2.1 At room temperature .................................................................................................................................. 50

14.2.2 At elevated temperature ............................................................................................................................ 50

14.3 Transverse tensile test on the weld ....................................................................................................... 51

14.4 Hardness test .................................................................................................................................................. 51

14.5 Weld bend test ............................................................................................................................................... 51

14.6 Impact testing ................................................................................................................................................ 51

14.7 Dimensional testing ..................................................................................................................................... 52

14.8 Visual testing (VT) ........................................................................................................................................ 52

14.9 Non-destructive testing (NDT) ................................................................................................................. 52

14.9.1 Personnel ......................................................................................................................................................... 52

14.9.2 NDT of the weld ............................................................................................................................................. 52

14.9.3 NDT of cold formed tees ............................................................................................................................. 53

14.9.4 Detection of laminar imperfections ....................................................................................................... 53

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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)

14.9.5 NDT for the detection of longitudinal imperfections ...................................................................... 53

14.9.6 NDT for the detection of transverse imperfections ......................................................................... 53

14.9.7 NDT of bars and forgings ........................................................................................................................... 53

14.10 Positive material identification (PMI) .................................................................................................. 54

15 Marking ............................................................................................................................................................ 54

16 Protection and packaging ......................................................................................................................... 55

Annex A (normative) Dimensions ......................................................................................................................... 56

A.1 General ............................................................................................................................................................. 56

A.2 Elbows .............................................................................................................................................................. 56

A.3 Tees ................................................................................................................................................................... 58

A.4 Reducers .......................................................................................................................................................... 60

A.5 Caps ................................................................................................................................................................... 62

Annex B (normative) Determination of pressure factors and wall thickness ...................................... 64

B.1 General ............................................................................................................................................................. 64

B.2 Symbols and units ........................................................................................................................................ 64

B.3 Minimal and nominal wall thickness .................................................................................................... 67

B.4 Pressure factors of fittings of type A ..................................................................................................... 67

B.4.1 Pressure factor .............................................................................................................................................. 67

B.4.2 Elbows .............................................................................................................................................................. 68

B.4.3 Tees ................................................................................................................................................................... 68

B.4.4 Reducers .......................................................................................................................................................... 71

B.4.5 Caps ................................................................................................................................................................... 75

B.5 Wall thicknesses of fittings of type B .................................................................................................... 77

B.5.1 Elbows .............................................................................................................................................................. 77

B.5.2 Tees ................................................................................................................................................................... 79

B.5.3 Reducers .......................................................................................................................................................... 81

B.5.4 Caps ................................................................................................................................................................... 86

Annex C (normative) Pressure factor tables for Fittings of type A ............................................................ 88

C.1 General ............................................................................................................................................................. 88

C.2 Elbows .............................................................................................................................................................. 88

C.3 Tees ................................................................................................................................................................... 91

C.4 Reducers ........................................................................................................................................................ 100

C.5 Caps ................................................................................................................................................................. 111

Annex D (informative) Wall thickness tables for fittings of type B ......................................................... 112

D.1 General ........................................................................................................................................................... 112

D.2 Elbows ............................................................................................................................................................ 112

D.3 Tees ................................................................................................................................................................. 115

D.4 Reducers ........................................................................................................................................................ 122

D.5 Caps ................................................................................................................................................................. 138

Annex E (informative) Recommended heat treatment temperatures ................................................... 140

Annex F (informative) Creep rupture strength values ................................................................................ 141

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2014/68/EU ..................................................................................... 147

Bibliography ............................................................................................................................................................... 149

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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
European foreword

This document (prEN 10253-2:2017) has been prepared by Technical Committee ECISS/TC 110 "Steel

tubes, and iron and steel fittings", the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10253-2:2007.

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, see informative Annex ZA, which is an integral part of this

document.

EN 10253 comprises a series of European Standards about Butt-welding pipe fittings, namely:

— Part 1: Wrought carbon steel for general use and without specific inspection requirements;

— Part 2: Non alloy and ferritic alloy steels with specific inspection requirements;

— Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection

requirements;

— Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection

requirements.
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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
Introduction

In writing this European Standard the competent committee recognized that there are two broad types

of products commonly used, and decided to reflect these in the standard by differentiating between two

parts.

EN 10253-1 describes fittings without formal reference to the pressure resistance, which are not

intended to be used in applications, covered by the Pressure Equipment Directive (2014/68/EU)

classes I to IV.

EN 10253-2 defines two types of fittings: Type A fittings have the same wall thickness at the welding

ends and at the body of the fitting than a pipe having the same specified wall thickness. Their resistance

to internal pressure is, in general, less than that of a straight pipe with the same dimensions. Type B

fittings showing increased wall thickness at the body of the fitting are designed to resist the same

internal pressure as a straight pipe with same dimensions. These two types of fittings are intended to be

used in applications covered by the EU Directive 2014/68/EU. According to this Directive and further

interpretation guidelines (e.g. guideline 7/19), seamless fittings are considered as materials whereas

welded fittings are considered as components. Therefore, in some areas of this European Standard,

provisions for seamless and welded fittings are different.

The selection of steel type and requirement level depend on many factors; the properties of the fluid to

be conveyed, the service conditions, the design code and any statutory requirements should all be taken

into consideration. Therefore this standard gives no detailed guidelines for the application of different

parts. It is the ultimate responsibility of the user to select the appropriate part for the intended

application.

IMPORTANT — This document contains, in Annexes B, C and D, tables which have to be re-

examined with regard to their correctness before publication of the standard. In the context of

this CEN-Enquiry readers of this draft are therefore invited to comment on any amendments that

may be required, particularly with regard to the tables in Annexes B, C and D.
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oSIST prEN 10253-2:2018
prEN 10253-2:2017 (E)
1 Scope

This draft European Standard specifies the technical delivery requirements for seamless and welded

butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of

carbon and alloy steel in two test-categories which are intended for pressure purposes at room

temperature, at low temperature or at elevated temperatures, and for the transmission and distribution

of fluids and gases.
It specifies:
a) type of fittings;
1) type A: Butt-welding fittings with reduced pr
...

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