SIST EN 1254-20:2021/oprA1:2024

Copper and copper alloys - Plumbing fittings - Part 20: Definitions, thread dimensions, test methods, reference data and supporting information

This document contains definitions, thread dimension, reference data (minimum bore), supporting information (assembling instructions) and describes the test methods referenced by other parts of the EN 1254 series.
Thread dimensions comprise: wall thickness at threaded portions of fittings, dimensions of tail pipe ends for swivel fittings, dimensions of gas union connectors, thread dimensions and thread profile.
Test methods comprise: leak tightness under internal hydrostatic pressure, leak tightness under internal pneumatic pressure, integrity of fabricated fitting bodies or having an 'as cast' microstructure, resistance to pull out of joints to metallic tubes, resistance of joints with metallic tube to vibration, resistance of joints to static flexural force, leak tightness of joints under vacuum, the resistance of joints to temperature cycling, detecting non-pressed fitting ends, resistance to stress corrosion, detection of a carbon film on the surface of copper fittings, determination of mean depth of dezincification, resistance of joints to pressure cycling, disconnection and re-use, determining if the diameter and/or the length of engagement of a capillary end is/are within the specified tolerance, determining the minimum length of engagement of an integral solder or brazing ring socket having a formed groove.

Kupfer und Kupferlegierungen - Fittings - Teil 20: Definitionen, Gewindemaße, Prüfverfahren, Referenzdaten und ergänzende Informationen

Cuivre et alliages de cuivre - Raccords - Partie 20 : Définitions, dimensions de filetage, méthodes d'essai, données de référence et informations complémentaires

Baker in bakrove zlitine - Fitingi - 20. del: Definicije, mere navojev, preskusne metode, referenčni podatki in dodatne informacije - Dopolnilo A1

General Information

• Status: Not Published
• Public Enquiry End Date: 29-Sep-2024
• ICS: 23.040.40 - Metal fittings
• ICS: 77.150.30 - Copper products
• Technical Committee: INEK - Nonferrous metals
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 20-Feb-2025
• Due Date: 25-Feb-2025
• Completion Date: 20-Feb-2025
• Ref Project: EN 1254-20:2021/prA1 - Copper and copper alloys - Plumbing fittings - Part 20: Definitions, thread dimensions, test methods, reference data and supporting information

Relations

• Merged Into: SIST EN 1254-20:2021+A1:2025 - Copper and copper alloys - Plumbing fittings - Part 20: Definitions, thread dimensions, test methods, reference data and supporting information
• Effective Date: 27-Nov-2024
• Amends: SIST EN 1254-20:2021 - Copper and copper alloys - Plumbing fittings - Part 20: Definitions, thread dimensions, test methods, reference data and supporting information
• Effective Date: 17-Apr-2024

Overview

EN 1254-20:2021/prA1 - published by CEN - is the technical specification for copper and copper-alloy plumbing fittings that provides definitions, thread dimensions, reference data and supporting information, and describes the test methods referenced across the EN 1254 series. The A1 amendment updates scope and adds a formal minimum wall thickness table for fitting bodies and clarifies supporting-sleeve definitions and assembling instructions. Keywords: copper fittings, plumbing fittings standard, EN 1254-20, copper alloys, thread dimensions.

Key topics and technical requirements

• Scope and definitions
  • Standardizes terminology for plumbing fittings made from copper and copper alloys.
  • Amendment A1 expands scope to explicitly include minimum bore and wall thickness and assembling instructions.
• Thread dimensions and profiles
  • Specifies: wall thickness at threaded portions, dimensions of tail-pipe ends for swivel fittings, dimensions for gas union connectors, thread dimensions and thread profile.
• Reference data
  • Includes reference values such as minimum bore and, via A1, a minimum wall thickness table (Table 14) for wrought, cast and continuously cast copper alloys (with exclusions for threaded portions, tube connecting ends and supporting sleeves).
• Test methods
  • Detailed testing required or referenced by other EN 1254 parts, including:
    • Leak tightness under internal hydrostatic and pneumatic pressure
    • Integrity of fabricated or as-cast fitting bodies
    • Pull-out resistance of joints to metallic tubes
    • Vibration and static flexural resistance of joints
    • Leak tightness under vacuum and resistance to temperature cycling
    • Detection of non-pressed fitting ends and carbon film presence
    • Resistance to stress corrosion and dezincification depth determination
    • Pressure cycling, disconnection and re‑use, verification of capillary engagement tolerances, and minimum engagement for solder/braze ring sockets

Applications

• Use EN 1254-20 when designing, manufacturing, testing or specifying copper plumbing fittings for potable water, heating and gas systems where compliance with European fittings standards is required.
• Guides quality control, type testing and conformity assessment for product certification and CE marking (where applicable).
• Provides technical basis for installation instructions and assembly checks used by installers and inspection bodies.

Who should use this standard

• Manufacturers and designers of copper and copper-alloy plumbing fittings
• Test laboratories and quality assurance engineers performing mechanical, leak and corrosion tests
• Specifiers, procurement teams and regulatory authorities writing product or building compliance requirements
• Installers and maintenance teams needing assembling instructions and acceptance criteria

Related standards

• Related parts of the EN 1254 series
• EN ISO 15874, EN ISO 15875, EN ISO 15876, EN ISO 15877, EN ISO 21003 and EN ISO 22391 (systems referenced for which the A1 wall-thickness table is applicable)

For product compliance, refer to the full EN 1254-20:2021/prA1 document and national transpositions for mandatory requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2024
Baker in bakrove zlitine - Fitingi - 20. del: Definicije, mere navojev, preskusne
metode, referenčni podatki in dodatne informacije - Dopolnilo A1
Copper and copper alloys - Plumbing fittings - Part 20: Definitions, thread dimensions,
test methods, reference data and supporting information
Kupfer und Kupferlegierungen - Fittings - Teil 20: Definitionen, Gewindemaße,
Prüfverfahren, Referenzdaten und ergänzende Informationen
Cuivre et alliages de cuivre - Raccords - Partie 20 : Définitions, dimensions de filetage,
méthodes d'essai, données de référence et informations complémentaires
Ta slovenski standard je istoveten z: EN 1254-20:2021/prA1
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.150.30 Bakreni izdelki Copper products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 1254-20:2021
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
July 2024
ICS 23.040.40
English Version
Copper and copper alloys - Plumbing fittings - Part 20:
Definitions, thread dimensions, test methods, reference
data and supporting information
Cuivre et alliages de cuivre - Raccords - Partie 20 : Kupfer und Kupferlegierungen - Fittings - Teil 20:
Définitions, dimensions de filetage, méthodes d'essai, Definitionen, Gewindemaße, Prüfverfahren,
données de référence et informations complémentaires Referenzdaten und ergänzende Informationen
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 133.

This draft amendment A1, if approved, will modify the European Standard EN 1254-20:2021. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment 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, 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, Türkiye 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: Rue de la
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