EN 14276-2:2020

Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements

1.1   This document specifies the requirements for material, design, manufacturing, testing and documentation for stationary piping intended for use in refrigerating systems, heat pumps and secondary cooling and heating systems. These refrigerating systems and heat pump systems are referenced in this document as refrigerating systems as defined in EN 378-1:2016.
The term "refrigerating system" used in this document includes heat pumps.
1.2   This document applies to piping, including welded or brazed attachments up to and including the flanges, screwed, welded or brazed connectors, or to the edge to be welded or brazed at the first circumferential joint connecting piping or other elements.
1.3   This document applies to the selection, application and installation of safety accessories intended to protect the piping during the various phases of the refrigeration cycle.
1.4   This document applies to the following piping:
-   heat exchanger consisting of piping for the purpose of cooling or heating air where piping aspects are predominant;
-   piping incorporated into an assembly (e.g. self-contained system, condensing unit);
-   field erected piping.
1.5   This document applies to piping with an internal pressure down to -1 bar, to account for the evacuation of the piping prior to charging with refrigerant.
1.6   This document applies to both the mechanical loading conditions and thermal conditions as defined in EN 13445 3:2014/A5:2018 associated with refrigerating systems. It applies to piping subject to the maximum allowable temperatures for which nominal design stresses for materials are derived using EN 14276-1:2020 or as specified in this document. In addition, piping designed to this document will have a maximum design temperature not exceeding 200 °C and a maximum design pressure not exceeding 160 bar. Outside of these limits, the EN 13480 series can be used for the design construction and inspection of the piping. Under these circumstances, the unique nature of a refrigerating plant, as indicated in the introduction of EN 14276-1:2020, will also be taken into account.
1.7   This document applies to piping where the main pressure bearing parts are manufactured from metallic ductile materials as defined in Clause 4 and in EN 14276-1:2020.

Druckgeräte für Kälteanlagen und Wärmepumpen - Teil 2: Rohrleitungen - Allgemeine Anforderungen

1.1 Dieses Dokument legt die Anforderungen an Werkstoffe, Konstruktion, Herstellung, Prüfung und Dokumentation für ortsfeste Rohrleitungen für Kälteanlagen, Wärmepumpen und indirekte Kühl  und Heizsysteme fest. Diese Kälteanlagen und Wärmepumpen werden im vorliegenden Dokument als Kälteanlagen nach EN 378 1:2016 bezeichnet.
Der Begriff „Kälteanlage“ im vorliegenden Dokument schließt Wärmepumpen ein.
1.2 Dieses Dokument gilt für Rohrleitungen mit angeschweißten oder angelöteten Bauteilen, einschließlich Flanschen, Schraub , Schweiß  oder Lötverbindungen, oder bis zu der ersten Schweiß  oder Lötnaht für den Anschluss von Rohrleitungen oder anderen Teilen.
1.3 Dieses Dokument gilt für die Auswahl, Anwendung und den Einbau von Ausrüstungsteilen mit Sicherheitsfunktion zum Schutz der Rohrleitungen während der verschiedenen Phasen des Kältemittelkreislaufs.
1.4 Dieses Dokument gilt für folgende Rohrleitungen:
- Wärmeübertrager, bestehend aus Rohrleitungen zum Kühlen oder Erhitzen von Luft, bei maßgebenden Aspekten von Rohrleitungen;
- Rohrleitungen innerhalb einer Baugruppe (z. B. Kältesatz, Verdichtungssatz);
- vor Ort montierte Rohrleitungen.
1.5 Dieses Dokument gilt für Rohrleitungen mit einem Innendruck bis −1 bar, um der Entleerung der Rohrleitung vor dem Befüllen mit Kältemittel Rechnung zu tragen.
1.6 Dieses Dokument gilt sowohl für die mechanischen Belastungen als auch die thermischen Beanspruchungen nach den Festlegungen in EN 13445 3:2014/A5:2018, die im Zusammenhang mit Kälteanlagen auftreten. Es gilt für Rohrleitungen mit den maximal zulässigen Temperaturen, für die die zulässigen Nennspannungen für die Werkstoffe nach EN 14276 1:2020 abgeleitet werden oder in diesem Dokument festgelegt sind. Ferner müssen Rohrleitungen, die nach diesem Dokument ausgelegt sind, eine maximale Auslegungstemperatur von 200 °C und einen maximalen Auslegungsdruck von 160 bar aufweisen. Außerhalb dieser Grenzwerte kann für die Konstruktion, Herstellung und Prüfung der Rohrleitungen die Normenreihe EN 13480 herangezogen werden. In diesen Fällen müssen die besonderen Merkmale einer Kälteanlage, wie in der Einleitung der EN 14276 1:2020 angegeben, ebenfalls berücksichtigt werden.
1.7 Dieses Dokument gilt für Rohrleitungen, deren wichtigste drucktragende Teile aus duktilen metallischen Werkstoffen nach den Festlegungen in Abschnitt 4 und in EN 14276 1:2020 hergestellt sind.

Équipements sous pression pour systèmes de réfrigération et pompes à chaleur - Partie 2 : Tuyauteries - Exigences générales

1.1   Le présent document spécifie les exigences relatives aux matériaux, à la conception, à la fabrication, aux essais et à la documentation concernant les tuyauteries fixes destinées à être utilisées dans des systèmes de réfrigération, des pompes à chaleur et des systèmes de refroidissement et de chauffage secondaires. Ces systèmes de réfrigération et systèmes de pompes à chaleur sont désignés dans le présent document par le terme systèmes de réfrigération défini dans l’EN 378-1:2016.
Le terme « système frigorifique » utilisé dans le présent document inclut les pompes à chaleur.
1.2   Le présent document s’applique aux tuyauteries comportant les fixations soudées ou brasées y compris les brides, les raccords vissés, soudés ou brasés ou, d’autre part, au bord à souder ou à braser au premier joint circulaire de raccordement à la tuyauterie ou à d’autres éléments.
1.3   Le présent document traite de la sélection, de l’application et de l’installation des accessoires de sécurité destinés à protéger les tuyauteries sous pression au cours des diverses phases du cycle de réfrigération.
1.4   Le présent document s’applique aux tuyauteries suivantes :
-   les échangeurs thermiques constitués de tuyaux et destinés au refroidissement ou au réchauffement de l'air, où les aspects liés à la tuyauterie prédominent ;
-   les tuyauteries incorporées dans un ensemble (par exemple système autonome, unité de condensation) ;
-   les tuyauteries montées sur site.
1.5   Le présent document s’applique aux tuyauteries soumises à une pression intérieure jusqu’à -1 bar nécessaire pour réaliser la vidange de la tuyauterie avant de charger le fluide frigorigène.
1.6   Le présent document concerne les conditions de chargement mécanique et les conditions thermiques définies dans l’EN 13480-3:2014/A5:2018 associées aux systèmes de réfrigération. Il s’applique aux tuyauteries soumises aux températures maximales admissibles pour lesquelles des contraintes nominales de calcul applicables aux matériaux sont déterminées à l’aide de l’EN 14276 1:2020 ou spécifiées dans le présent document. En outre, les tuyauteries conçues conformément au présent document ont une température maximale de conception n’excédant pas 200 °C et une pression maximale de conception n’excédant pas 160 bar. En dehors de ces limites, la série de normes EN 13480 peut être utilisée pour la conception, la construction et l’inspection de la tuyauterie. Dans ces circonstances, la nature particulière de l’installation de réfrigération indiquée dans l’introduction de l’EN 14276-1:2020 est prise en compte.
1.7   Le présent document s’applique aux tuyauteries dont les parties principales sous pression sont fabriquées en matériaux métalliques ductiles définis à l’Article 4 de la présente norme et dans l’EN 14276-1:2020.

Tlačna oprema za hladilne sisteme in toplotne črpalke - 2. del: Cevovodi - Splošne zahteve

General Information

• Status: Published
• Publication Date: 25-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 23.020.30 - Pressure vessels, gas cylinders
• ICS: 27.080 - Heat pumps
• ICS: 27.200 - Refrigerating technology
• Technical Committee: CEN/TC 182 - Refrigerating systems, safety and environmental requirements
• Drafting Committee: CEN/TC 182/WG 7 - JWG CEN/TC 182/CEN/TC 54 Pressure vessels for refrigerating systems
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 02-Sep-2025
• Completion Date: 02-Sep-2025
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN 14276-2:2020 - Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements

Relations

• Replaces: EN 14276-2:2007+A1:2011 - Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements
• Effective Date: 18-May-2016
• Amended By: EN 14276-2:2020/prA1 - Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements
• Effective Date: 25-May-2022

Overview - EN 14276-2:2020 (Piping for refrigerating systems and heat pumps)

EN 14276-2:2020 is a CEN European standard that specifies general requirements for stationary piping used in refrigerating systems and heat pumps. It covers material selection, design, manufacturing, testing and documentation for piping (including welded/brazed attachments, flanges and connectors) and for safety accessories that protect piping during refrigeration cycles. The standard applies to piping with internal pressure down to −1 bar and sets design limits of maximum design temperature ≤ 200 °C and maximum design pressure ≤ 160 bar. It is intended to be read alongside EN 14276-1:2020 and other piping standards.

Key topics and technical requirements

• Scope and applicability
  • Stationary piping for refrigerating systems, heat pumps and secondary cooling/heating systems (EN 378-1 referenced).
  • Includes heat-exchanger piping where piping aspects dominate, piping in assemblies (condensing units, self-contained systems) and field-erected piping.
• Materials
  • Applies to metallic, ductile pressure-bearing materials (material documentation and prevention of brittle fracture requirements included).
• Design
  • Mechanical and thermal loading conditions per EN 13445-3 and derived nominal design stresses (EN 14276-1 referenced).
  • Design temperature, minimum material temperature, joint coefficients and allowable stresses defined.
• Manufacturing and fabrication
  • Requirements for permanent joints, forming, post weld heat treatment, traceability and tolerances.
• Testing and inspection
  • Non‑destructive and destructive testing, final visual inspections, pressure and leak testing, calibration and type examination procedures.
• Documentation and marking
  • Design documentation, operating instructions, user technical documentation and record-keeping.
• Safety accessories
  • Selection, application and installation requirements for accessories intended to protect piping during various phases of the refrigeration cycle.

Practical applications and users

EN 14276-2:2020 is used by:

• HVACR and refrigeration designers and engineers specifying piping for commercial and industrial systems.
• Manufacturers of condensing units, heat exchangers and packaged refrigerating systems.
• Fabricators and installers responsible for welding, brazing and field erection.
• Test laboratories, inspection bodies and conformity assessment authorities applying Pressure Equipment Directive (PED) requirements.
• Plant owners and maintenance teams who need to ensure safe, documented piping assemblies.

Related standards

• EN 14276-1:2020 - Vessels - General requirements
• EN 378-1:2016 - Refrigerating systems - Terminology and safety
• EN 13480 series - Metallic industrial piping (for designs outside EN 14276-2 limits)
• Directive 2014/68/EU (Pressure Equipment Directive) - conformity and essential requirements

Keywords: EN 14276-2:2020, refrigerating systems, heat pumps, piping standards, pressure equipment, piping design, material requirements, testing and documentation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 14276-2:2007+A1:2011
Tlačna oprema za hladilne sisteme in toplotne črpalke - 2. del: Cevovodi - Splošne
zahteve
Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General
requirements
Druckgeräte für Kälteanlagen und Wärmepumpen - Teil 2: Rohrleitungen - Allgemeine
Anforderungen
Équipements sous pression pour systèmes de réfrigération et pompes à chaleur - Partie
2 : Tuyauteries - Exigences générales
Ta slovenski standard je istoveten z: EN 14276-2:2020
ICS:
23.020.32 Tlačne posode Pressure vessels
27.080 Toplotne črpalke Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 14276-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 23.020.30; 27.080; 27.200 Supersedes EN 14276-2:2007+A1:2011
English Version
Pressure equipment for refrigerating systems and heat
pumps - Part 2: Piping - General requirements
Équipements sous pression pour systèmes de Druckgeräte für Kälteanlagen und Wärmepumpen -
réfrigération et pompes à chaleur - Partie 2 : Teil 2: Rohrleitungen - Allgemeine Anforderungen
Tuyauteries - Exigences générales
This European Standard was approved by CEN on 1 December 2019.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14276-2:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 9
4 Material . 10
4.1 General . 10
4.2 Requirements for materials to be used for pressurized parts . 10
4.3 Materials . 11
4.3.1 General . 11
4.3.2 Special considerations . 11
4.4 Requirements for the prevention of brittle fracture . 11
4.5 Material documentation . 11
4.6 Materials for non-pressure retaining parts . 11
5 Piping classification — Category of piping. 11
6 Design . 12
6.1 General . 12
6.2 Corrosion, corrosion protection . 12
6.3 Loading. 12
6.4 Design temperature t and minimum material temperature . 13
d
6.5 Calculation temperature t . 13
c
6.5.1 General . 13
6.5.2 Piping without heater . 13
6.5.3 Piping with heater. 13
6.6 Joint coefficient . 14
6.7 Design stress . 15
6.8 Access and inspection openings, venting and draining provisions, filling and
discharge provisions and handling devices. 16
6.8.1 Access and inspection openings . 16
6.8.2 Venting and draining provisions . 16
6.8.3 Filling and discharge provisions . 16
6.8.4 Handling devices . 16
6.9 Design methods . 16
6.9.1 General . 16
6.9.2 Design by formula (DBF) . 17
6.9.3 Joint design . 18
7 Manufacturing . 18
7.1 Material traceability . 18
7.2 Manufacturing tolerances . 19
7.3 Permanent joints . 19
7.4 Forming of pressure parts . 19
7.5 Post weld heat treatment . 19
7.6 Internal cleanness . 19
7.7 Repairs/reworks . 19
7.8 Finishing operations . 19
8 Testing and inspection . 19
8.1 Performance of inspection and testing . 19
8.2 Design documentation, review and approval . 20
8.2.1 General . 20
8.2.2 Design documentation . 20
8.2.3 Design examination and design approval. 21
8.2.4 Design documentation change . 21
8.3 Type examination . 21
8.4 Calibration . 21
8.5 Material . 21
8.6 Manufacturing . 21
8.7 Non-destructive and destructive testing . 22
8.8 Subcontracted elements . 22
8.9 Final inspection . 22
8.9.1 General . 22
8.9.2 Visual examination . 22
8.9.3 Examination of documentation . 22
8.9.4 Pressure test . 23
8.9.5 Leak test . 24
8.10 Marking . 24
8.11 Documentation . 25
8.11.1 General . 25
8.11.2 Operating instructions . 25
8.11.3 Technical documentation for user . 26
8.11.4 Records . 26
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered . 28
Bibliography . 30

European foreword
This document (EN 14276-2:2020) has been prepared by Technical Committee CEN/TC 182
“Refrigerating systems, safety and environmental requirements”, the secretariat of which is held by DIN.
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 August 2020, and conflicting national standards shall be
withdrawn at the latest by August 2020.
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 14276-2:2007+A1:2011.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
EN 14276, Pressure equipment for refrigerating systems and heat pumps, is currently composed of the
following parts:
— Part 1: Vessels - General requirements;
— Part 2: Piping - General requirements.
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.
Introduction
This document recognizes the unique nature of piping for refrigerating systems or heat pumps and is
intended to address the specific needs of the refrigeration and heat pump industry. This document should
be read in conjunction with the various parts of the EN 13480 series and EN 14276-1:2020.
The unique nature of a refrigerating system is defined in the Introduction of EN 14276-1:2020.
1 Scope
1.1 This document specifies the requirements for material, design, manufacturing, testing and
documentation for stationary piping intended for use in refrigerating systems, heat pumps and secondary
cooling and heating systems. These refrigerating systems and heat pump systems are referenced in this
document as refrigerating systems as defined in EN 378-1:2016.
The term “refrigerating system” used in this document includes heat pumps.
1.2 This document applies to piping, including welded or brazed attachments up to and including the
flanges, screwed, welded or brazed connectors, or to the edge to be welded or brazed at the first
circumferential joint connecting piping or other elements.
1.3 This document applies to the selection, application and installation of safety accessories intended
to protect the piping during the various phases of the refrigeration cycle.
1.4 This document applies to the following piping:
— heat exchanger consisting of piping for the purpose of cooling or heating air where piping aspects
are predominant;
— piping incorporated into an assembly (e.g. self-contained system, condensing unit);
— field erected piping.
1.5 This document applies to piping with an internal pressure down to –1 bar, to account for the
evacuation of the piping prior to charging with refrigerant.
1.6 This document applies to both the mechanical loading conditions and thermal conditions as defined
in EN 13445-3:2014/A5:2018 associated with refrigerating systems. It applies to piping subject to the
maximum allowable temperatures for which nominal design stresses for materials are derived using
EN 14276-1:2020 or as specified in this document. In addition, piping designed to this document will
have a maximum design temperature not exceeding 200 °C and a maximum design pressure not
exceeding 160 bar. Outside of these limits, the EN 13480 series can be used for the design construction
and inspection of the piping. Under these circumstances, the unique nature of a refrigerating plant, as
indicated in the introduction of EN 14276-1:2020, will also be taken into account.
1.7 This document applies to piping where the main pressure bearing parts are manufactured from
metallic ductile materials as defined in Clause 4 and in EN 14276-1:2020.
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 378-1:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part
1: Basic requirements, definitions, classification and selection criteria
EN 378-2:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part
2: Design, construction, testing, marking and documentation
EN 378-3:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part
3: Installation site and personal protection
EN 378-4:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part
4: Operation, maintenance, repair and recovery
EN 764-1:2015+A1:2016, Pressure equipment — Part 1: Vocabulary
EN 764-2:2012, Pressure equipment — Part 2: Quantities, symbols and units
EN 764-4:2014, Pressure equipment — Part 4: Establishment of technical delivery conditions for metallic
materials
EN 764-5:2014, Pressure equipment — Part 5: Inspection documentation of metallic materials and
compliance with the material specification
Copper and copper alloys — Plate, sheet and circles for boilers, pressure vessels and hot
EN 1653:1997,
water storage units
EN 10204:2004, Metallic products — Types of inspection documents
EN 12178:2016, Refrigerating systems and heat pumps — Liquid level indicating devices — Requirements,
testing and marking
EN 12735-1:2016, Copper and copper alloys — Seamless, round tubes for air conditioning and
refrigeration — Part 1: Tubes for piping systems
EN 12735-2:2016, Copper and copper alloys — Seamless, round tubes for air conditioning and
refrigeration — Part 2: Tubes for equipment
EN 13445-3:2014, Unfired pressure vessels — Part 3: Design
EN 13445-5:2014, Unfired pressure vessels — Part 5: Inspection and testing
EN 13480-2:2017, Metallic industrial piping — Part 2: Materials
EN 13480-3:2017, Metallic industrial piping — Part 3: Design and calculation
CEN/TR 13480-7:2017, Metallic industrial piping — Part 7: Guidance on the use of conformity assessment
procedures
EN 14276-1:2020, Pressure equipment for refrigerating systems and heat pumps — Part 1: Vessels —
General requirements
EN ISO 2553:2013, Welding and allied processes — Symbolic representation on drawings — Welded joints
(ISO 2553:2013)
As impacted by EN 1653:1997/A1:2000.
As impacted by EN 13445-3:2014/A5:2018.
As impacted by EN 13445-5:2014/A1:2018.
As impacted by EN 13480-2:2017/A1:2018, EN 13480-2:2017/A2:2018 and EN 13480-2:2017/A3:2018.
EN ISO 3452-1:2013, Non-destructive testing — Penetrant testing — Part 1: General principles (ISO 3452-
1:2013)
EN ISO 4063:2010, Welding and allied processes — Nomenclature of processes and reference numbers (ISO
4063:2009)
EN ISO 5817:2014, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections (ISO 5817:2014)
EN ISO 10042:2018, Welding — Arc-welded joints in aluminium and its alloys — Quality levels for
imperfections (ISO 10042:2018)
EN ISO 10675-1:2016, Non-destructive testing of welds — Acceptance levels for radiographic testing —
Part 1: Steel, nickel, titanium and their alloys (ISO 10675-1:2016)
EN ISO 10675-2:2017, Non-destructive testing of welds — Acceptance levels for radiographic testing —
Part 2: Aluminium and its alloys (ISO 10675-2:2017)
EN ISO 10893-8:2011, Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of
seamless and welded steel tubes for the detection of laminar imperfections (ISO 10893-8:2011)
EN ISO 10893-11:2011, Non-destructive testing of steel tubes — Part 11: Automated ultrasonic testing of
the weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections (ISO
10893-11:2011)
EN ISO 11666:2018, Non-destructive testing of welds — Ultrasonic testing — Acceptance levels (ISO
11666:2018)
EN ISO 16826:2014, Non-destructive testing — Ultrasonic testing — Examination for discontinuities
perpendicular to the surface (ISO 16826:2012)
EN ISO 17636-1:2013, Non-destructive testing of welds — Radiographic testing — Part 1: X- and gamma-
ray techniques with film (ISO 17636-1:2013)
EN ISO 17636-2:2013, Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-
ray techniques with digital detectors (ISO 17636-2:2013)
EN ISO 17637:2016, Non-destructive testing of welds — Visual testing of fusion-welded joints (ISO
17637:2016)
EN ISO 17640:2010, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment (ISO 17640:2010)
EN ISO 23277:2015, Non-destructive testing of welds — Penetrant testing — Acceptance levels (ISO
23277:2015)
ISO 817:2014, Refrigerants — Designation and safety classification
3 Terms and definitions
For the purposes of this document, the terms, definitions, symbols, quantities and units listed in
EN 378-1:2016, EN 764-1:2015+A1:2016, EN 764-2:2012, EN 764-4:2014, EN 764-5:2014,
EN 14276-1:2020 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
coil
heat exchanger consisting of pipe or tubing (more particularly made from one or more bent pipes) used
to cool or heat air
Note 1 to entry: See Figure 1.

a) Coil with straight tubes and elbows b) Coil with elbow and headers
Figure 1 — Coil
3.2 Symbols, quantities and units
Symbols, quantities and units used in this document are listed in Table 1.
Table 1 — Symbols, quantities and units
Symbol Quantity Unit
DBA Design by analysis —
DBF Design by formula —
D External diameter of tube mm
e
a
DN Nominal diameter —
e Thickness mm
EAM European approval of material —
f Nominal design stress at design temperature MPa
NDT Non-destructive testing —
b
P Calculation pressure (in the formulae, P can be replaced by P) MPa or bar
c c
Symbol Quantity Unit
b
P Design pressure MPa or bar
d
PED Pressure equipment directive —
PMA Particular material appraisal —
b
PS Maximum allowable pressure MPa or bar
PT Penetrant testing —
PWHT Post weld heat treatments —
R Radius of curvature for tube mm
RT Radiographic testing —
t Calculation temperature °C
c
t Design temperature °C
d
TS Maximum allowable temperature °C
max
TS Minimum allowable temperature °C
min
UT Ultrasonic testing —
VT Visual testing —
z Joint coefficient for welds —
a
See also EN 14276-1:2020, 3.1.8.
b 2
1 bar = 100 000 Pa = 0,1 MPa = 0,1 N/mm .
4 Material
4.1 General
The materials referenced in this document shall meet the requirements of EN 14276-1:2020 unless
modified by the subclauses of this clause.
It is permitted to use non-metallic materials (e.g. gaskets, coatings, insulating materials, sight glasses)
provided they are compatible with the other materials, refrigerants and lubricants present.
Sight glasses shall comply with EN 12178:2016 for pressure bearing requirements.
4.2 Requirements for materials to be used for pressurized parts
Materials listed in this document have been identified for use in refrigerating piping. If it is required to
utilize a material not listed in this document, the requirements of EN 13480-2:2017 shall be followed
where applicable and the unique nature of refrigerating plant requirements shall also be taken into
account.
As impacted by EN 13480-2:2017/A1:2018, EN 13480-2:2017/A2:2018 and EN 13480-2:2017/A3:2018.
4.3 Materials
4.3.1 General
4.3.1.1 Piping manufactured from the following materials satisfies the requirements of this document for
the pressurized parts.
Material shall be selected from one option described in EN 764-4:2014.
4.3.1.2 Where mechanical properties may be modified by the piping manufacturing process, the material
shall be selected from the following material groups as defined in EN 14276-1:2020, Annex I:
— steel groups: 1.1, 1.2, 8.1;
— aluminium and aluminium alloys groups: 21, 22;
— copper groups: 31, 32, 33, 34, 35, included in EN 1653:1997 , EN 12735-1:2016, EN 12735-2:2016.
4.3.1.3 When materials do not comply with the above requirements, it is also permitted to use materials
which comply with European Approval of Material (EAM) or with Particular Material Appraisal (PMA)
according to EN 764-4:2014.
4.3.1.4 Where the piping manufacturing process does not modify mechanical properties, metallic
materials other than those quoted in 4.3.1.2 can be used if they comply with EAM or with PMA according
to EN 764-4:2014.
4.3.2 Special considerations
The requirements of EN 14276-1:2020, 4.3.3 shall apply.
4.4 Requirements for the prevention of brittle fracture
The requirements of EN 14276-1:2020, 4.4 shall apply.
The brittle fracture should be determined only when the material thickness can permit to make a test
piece according to EN ISO 148-1 with a minimum section size 5 mm × 10 mm.
4.5 Material documentation
The requirements of EN 14276-1:2020, 4.5 shall apply.
4.6 Materials for non-pressure retaining parts
The requirements of EN 14276-1:2020, 4.6 shall apply.
5 Piping classification — Category of piping
The pressure piping is classified into 2 categories according to Table 2 in accordance with the following:
a) the product of maximum allowable pressure PS (in bar) times DN;
b) the fluid classification as defined in EN 14276-1:2020, 5.2;

As impacted by EN 1653:1997/A1:2000.
c) the fluid state:
1) gases, liquefied gases, gases dissolved under pressure and those liquids whose vapour pressure
at the maximum allowable temperature is greater than 0,5 bar;
2) liquids having a vapour pressure at the maximum allowable temperature of not more than
0,5 bar.
For this document, the refrigerant containing parts are always considered as a gas circuit.
Table 2 — Classification of piping by categories
Fluid
Category Criteria
EN 14276-1:2020, 5.2
PS < 0,5 bars, no limit of DN or
0,5 bar < PS ≤ 10 bar, DN ≤ 100 or
Group 1
10 bar < PS ≤ 40 bar: PS × DN ≤ 1 000 or
PS > 40 bar, DN ≤ 25
X
PS < 0,5 bar, no limit of DN or
Group 2 0,5 bar < PS ≤ 35 bar, PS × DN ≤ 3 500 or
PS > 35 bar, DN ≤ 100
Group 1 Other than criteria for category X group 1
Y
Group 2 Other than criteria for category X group 2

NOTE Where refrigerating systems are subject to the Low Voltage Directive and/or the Machinery Directive,
exclusion in Article 1.2.f of the Pressure Equipment Directive (PED) can apply. In these cases, piping of category X
is not subject to PED requirements.
6 Design
6.1 General
This clause covers pressure piping constructed of materials as defined in Clause 4. The dimensions of
pressurized parts shall be designed at the design pressure (P ) at the design temperature (t ).
d d
For piping installed at site, requirements of EN 378-2:2016 shall be considered.
6.2 Corrosion, corrosion protection
The requirements of EN 14276-1:2020, 6.2 and 6.3 shall apply.
6.3 Loading
The normal load of piping covered in this document is:
— internal/external pressure;
— ambient and operational temperatures;
— static pressure and mass of contents in operating and test conditions;
— reaction forces and moments f
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