EN 10374:2021

SLOVENSKI STANDARD
01-november-2021
Varjeni spojni elementi za živilsko in kemično industrijo - Odcepi, kolena in
reducirni elementi za varjenje
Welded fittings for the food and chemical industries - Tees, bends and reducers for
welding
Anschweißarmaturen in der Lebensmittel- und chemischen Industrie - T-Stücke, Bogen
und Reduzierstücke zum Anschweißen
Raccords soudés pour l'industrie alimentaire et chimique - Tés, coudes et réducteurs à
souder
Ta slovenski standard je istoveten z: EN 10374:2021
ICS:
23.040.40 Kovinski fitingi Metal fittings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 10374
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2021
EUROPÄISCHE NORM
ICS 23.040.40
English Version
Welded fittings for the food and chemical industries - Tees,
bends and reducers for welding
Raccords soudés pour l'industrie alimentaire et Formstücke zum Anschweißen in der Lebensmittel-
chimique - Tés, coudes et réductions à souder und chemischen Industrie - T-Stücke, Bogen und
Reduzierstücke zum Anschweißen
This European Standard was approved by CEN on 11 July 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 10374:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols and abbreviated terms . 6
5 Designation of fittings and steel grades . 7
5.1 Designation of fittings . 7
5.2 Elbow . 7
5.3 Reducer . 7
5.4 T-piece . 7
5.4.1 T-piece form TL and form TS . 7
5.4.2 T-piece form TRL and form TRS . 7
5.5 Designation of steel grades . 7
6 Information to be supplied by the purchaser . 8
6.1 Mandatory information . 8
6.2 Options . 8
6.3 Examples of an order . 8
7 Requirements . 9
7.1 Material . 9
7.2 Manufacturing Process. 9
7.2.1 General . 9
7.2.2 Welding . 9
7.2.3 Heat treatment . 11
7.2.4 Surface finish and cleanliness . 11
8 Dimensions and tolerances . 11
8.1 Dimensions . 11
8.1.1 General . 11
8.1.2 Elbow . 11
8.1.3 Reducer . 18
8.1.4 T-piece . 22
8.2 Tolerances . 26
8.2.1 Dimensional tolerances . 26
8.2.2 Form tolerances . 28
9 Inspection . 32
9.1 Inspection criteria . 32
9.2 Inspection documents . 32
10 Marking . 33
11 Packaging and transport . 33
Annex A (informative) Supplementary information related to additional ordering
information on fabrication options . 34
Annex B (informative) List of stainless steel grades for fittings . 35
Bibliography . 36
European foreword
This document (EN 10374:2021) has been prepared by Technical Committee CEN/TC 459/SC 10 “Steel
tubes and fittings for steel tubes”, the secretariat of which is held by UNI.
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.
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.
1 Scope
This document specifies dimensions, tolerances, internal and external surface characteristics and
marking of welded fittings for the food and chemical industry.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10028-7, Flat products made of steels for pressure purposes - Part 7: Stainless steels
EN 10088-1, Stainless steels - Part 1: List of stainless steels
EN 10088-2, Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion
resisting steels for general purposes
EN 10204, Metallic products - Types of inspection documents
EN 10216-5, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5: Stainless
steel tubes
EN 10217-7, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 7: Stainless
steel tubes
EN 10253-4, Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex)
stainless steels with specific inspection requirements
EN 10357, Austenitic, austenitic-ferritic and ferritic longitudinally welded stainless steel tubes for the food
and chemical industry
EN 13018, Non-destructive testing - Visual testing - General principles
EN 13480 (series), Metallic industrial piping
EN ISO 1127, Stainless steel tubes - Dimensions, tolerances and conventional masses per unit length (ISO
1127)
EN ISO 4288, Geometrical product specifications (GPS) - Surface texture: Profile method - Rules and
procedures for the assessment of surface texture (ISO 4288)
EN ISO 6520-1, Welding and allied processes - Classification of geometric imperfections in metallic
materials - Part 1: Fusion welding (ISO 6520-1)
ISO 13715, Technical product documentation - Edges of undefined shape - Indication and dimensioning
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 6520-1 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
elbow
elbow fitting to allow a change direction of the pipeline with an angle of 45 °, 90 ° or 180 °
3.1.1
elbow form BS
elbow with standard weld ends
Note 1 to entry: Short execution.
3.1.2
elbow form BL
elbow with prolonged welding ends
Note 1 to entry: Long execution.
3.2
reducer
fitting that reduces the pipeline size from larger to a smaller diameter
3.2.1
reducer form RCS
concentric reducer with short length
Note 1 to entry: Short type.
3.2.2
reducer form RCL
concentric reducer with long length
Note 1 to entry: Long type.
3.2.3
reducer form RES
eccentric reducer with short length
Note 1 to entry: Short type.
3.2.4
reducer form REL
eccentric reducer with long length
Note 1 to entry: Long type.
3.3
T-piece
T-shaped fitting with a straight run and a branch perpendicular to the run
3.3.1
T-piece form TL
T-piece with equal tube diameters
3.3.2
T-piece form TS
T-piece with a short branch and equal tube diameters
3.3.3
T-piece form TRL
T-piece with a branch tube diameter smaller than the run tube diameter
3.3.4
T-piece form TRS
T-piece with a short branch and a branch tube diameter smaller tha
...