oSIST prEN 12735-2:2023
(Main)Copper and copper alloys - Seamless, round tubes for air conditioning and refrigeration - Part 2: Tubes for equipment
Copper and copper alloys - Seamless, round tubes for air conditioning and refrigeration - Part 2: Tubes for equipment
This document specifies the requirements, sampling, test methods and conditions of delivery for seamless round copper tubes, smooth or inner finned, used for heat exchangers and their internal connecting pipes in the manufacturing of refrigeration and air conditioning equipment.
It is applicable to tubes with an outside diameter from 3,97 mm up to and including 219 mm.
NOTE The tubes are supplied in straight length or as coils.
Kupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik - Teil 2: Rohre für Apparate
Dieses Dokument legt die Anforderungen, Probenentnahme, Prüfverfahren und die Lieferbedingungen für nahtlose Rundrohre aus Kupfer mit glatter oder berippter Innenoberfläche fest, die für Wärmeaustauscher und ihre inneren Verbindungsrohre bei der Herstellung von Apparaten der Kälte- und Klimatechnik verwendet werden.
Es gilt für Rohre mit einem Außendurchmesser von 3,97 mm bis 219 mm.
ANMERKUNG Die Rohre werden in geraden Längen oder als Spulen geliefert.
Cuivre et alliages de cuivre - Tubes ronds sans soudure pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matériel
Le présent document spécifie les exigences, le mode d’échantillonnage, les méthodes d’essai et les conditions de livraison applicables aux tubes ronds sans soudure en cuivre lisses ou à ailettes internes, utilisés pour les échangeurs thermiques et leurs raccordements intérieurs dans la fabrication des matériels de réfrigération et de conditionnement d’air.
Il s’applique aux tubes ayant un diamètre extérieur de 3,97 mm à 219 mm inclus.
NOTE Ces tubes sont livrés en longueurs droites ou bien en couronnes.
Baker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko tehniko - 2. del: Cevi za naprave in aparate
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12735-2:2023
01-maj-2023
Baker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko
tehniko - 2. del: Cevi za naprave in aparate
Copper and copper alloys - Seamless, round tubes for air conditioning and refrigeration -
Part 2: Tubes for equipment
Kupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik -
Teil 2: Rohre für Apparate
Cuivre et alliages de cuivre - Tubes ronds sans soudure pour l'air conditionné et la
réfrigération - Partie 2: Tubes pour le matériel
Ta slovenski standard je istoveten z: prEN 12735-2
ICS:
23.040.15 Cevi iz neželeznih kovin Non-ferrous metal pipes
77.150.30 Bakreni izdelki Copper products
oSIST prEN 12735-2:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12735-2:2023
DRAFT
EUROPEAN STANDARD
prEN 12735-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS 23.040.15 Will supersede EN 12735-2:2016
English Version
Copper and copper alloys - Seamless, round tubes for air
conditioning and refrigeration - Part 2: Tubes for
equipment
Cuivre et alliages de cuivre - Tubes ronds sans soudure Kupfer und Kupferlegierungen - Nahtlose Rundrohre
pour l'air conditionné et la réfrigération - Partie 2: für die Kälte- und Klimatechnik - Teil 2: Rohre für
Tubes pour le matériel Apparate
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 133.
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, 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 Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12735-2:2023 E
worldwide for CEN national Members.
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prEN 12735-2:2023 (E)
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Designations . 9
4.1 Material . 9
4.1.1 General. 9
4.1.2 Symbol . 9
4.1.3 Number . 9
4.2 Material condition . 9
4.3 Product . 9
5 Ordering information . 10
6 Requirements . 11
6.1 Composition . 11
6.2 Mechanical properties and grain size . 11
6.3 Dimensions and tolerances for smooth tubes . 12
6.3.1 General. 12
6.3.2 Nominal dimensions . 12
6.3.3 Tolerances on mean outside diameter . 13
6.3.4 Tolerances on wall thickness . 14
6.3.5 Tolerances on the mass for tubes supplied in coils . 15
6.3.6 Tolerances on length for tubes supplied in straight lengths . 15
6.3.7 Tolerances of form . 16
6.4 Dimensions and tolerances for inner finned tubes . 17
6.4.1 General. 17
6.4.2 Dimensions for inner finned tubes . 17
6.4.3 Tolerances on mean outside diameter . 18
6.4.4 Tolerances on wall thickness . 18
6.4.5 Tolerances on fin height, number of fins, shape of in and spiral pitch. 18
6.4.6 Tolerances on mass for tubes supplied in coils . 18
6.4.7 Tolerances on length for tubes supplied in straight lengths . 18
6.4.8 Tolerances of form . 18
6.5 Drift expanding . 18
6.6 Freedom from defects . 19
6.6.1 General. 19
6.6.2 Straight tubes . 19
6.6.3 Coiled tubes . 19
6.7 Surface quality . 20
7 Sampling . 20
8 Test methods . 20
8.1 Analysis . 20
8.2 Tensile test . 20
2
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8.3 Hardness test . 21
8.4 Estimation of average grain size . 21
8.5 Drift expanding test . 21
8.6 Carbon content test . 21
8.7 Freedom from defects test . 21
8.8 Retests . 21
9 Declaration of conformity and inspection documentation . 22
9.1 Declaration of conformity . 22
9.2 Inspection documentation . 22
10 Packaging, marking and form of delivery . 22
10.1 Packaging and marking . 22
10.2 Form of delivery . 22
10.2.1 Coils . 22
10.2.2 Straight lengths . 23
A.1 Eddy current test . 24
A.2 Hydrostatic test . 25
A.3 Pneumatic test . 25
Bibliography . 27
3
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prEN 12735-2:2023 (E)
European foreword
This document (prEN 12735-2:2023) has been prepared by Technical Committee CEN/TC 133 “Copper
and copper alloys”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12735-2:2016.
prEN 12735-2:2023 includes the following significant technical changes with respect to
EN 12735-2:2016:
a) NOTE in Scope modified;
b) Normative references updated;
c) Diameter added in Clause 5, Example 1 and Example 2;
d) Table 1 modified;
e) Conditions corrected in Table 3, footnote c;
f) Tolerance on mean wall thickness in Table 5 (0,06 was 0,08) amended;
g) Minimum diameter reduced to 3,97 in Table 8;
h) 6.4.4 and 6.4.5 amended;
i) 6.4.6, 6.4.7, 6.4.8 added;
j) 6.5 and 6.6.1 amended;
k) 8.4 amended;
l) Coil mass range and nominal width range extended in Table 12;
m) Annex ZA amended;
n) Several editorial amendments.
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) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
EN 12735, Copper and copper alloys — Seamless, round tubes for air conditioning and refrigeration
consists of two parts:
— Part 1: Tubes for piping systems
— Part 2: Tubes for equipment
4
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prEN 12735-2:2023 (E)
This is one of a series of European Standards for copper and copper alloy tubes. Other products are
specified as follows:
— EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and
heating applications
— EN 12449, Copper and copper alloys — Seamless, round tubes for general purposes
— EN 12450, Copper and copper alloys — Seamless, round copper capillary tubes
— EN 12451, Copper and copper alloys — Seamless, round tubes for heat exchangers
— EN 12452, Copper and copper alloys — Rolled, finned, seamless tubes for heat exchangers
— EN 12735-1, Copper and copper alloys — Seamless, round copper tubes for air conditioning and
refrigeration — Part 1: Tubes for piping systems
— EN 13348, Copper and copper alloys — Seamless, round copper tubes for medical gases or vacuum
— EN 13349, Copper and copper alloys — Pre-insulated copper tubes with solid covering
— EN 13600, Copper and copper alloys — Seamless copper tubes for electrical purposes
5
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Introduction
It is recommended that tubes manufactured in accordance with this document are certified as conforming
to the requirements of this document based on continuing surveillance which should be coupled with an
assessment of a supplier's quality management system.
NOTE It is advised to take appropriate precautions if applying insulating material because it could be
detrimental to the copper tube.
For this harmonized supporting standard for materials, presumption of conformity to the Essential
Requirements of the Directive is limited to technical data of the material in the standard and does not
presume adequacy of the material to specific equipment. Consequently, the technical data stated in the
material standard should be assessed against the design requirements of the specific equipment to verify
that the essential requirements of the Pressure Equipment Directive (PED) are satisfied.
6
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1 Scope
This document specifies the requirements, sampling, test methods and conditions of delivery for
seamless round copper tubes, smooth or inner finned, used for heat exchangers and their internal
connecting pipes in the manufacturing of refrigeration and air conditioning equipment.
It is applicable to tubes with an outside diameter from 3,97 mm up to and including 219 mm.
NOTE The tubes are supplied in straight length or as coils.
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 723:2009, Copper and copper alloys - Combustion method for determination of the carbon content on
the inner surface of copper tubes or fittings
EN 1971-1:2019, Copper and copper alloys - Eddy current test for measuring defects on seamless round
copper and copper alloy tubes - Part 1: Test with an encircling test coil on the outer surface
EN 1971-2:2019, Copper and copper alloys - Eddy current test for measuring defects on seamless round
copper and copper alloy tubes - Part 2: Test with an internal probe on the inner surface
EN 10204:2004, Metallic products - Types of inspection documents
EN 16090:2019, Copper and copper alloys - Estimation of average grain size by ultrasound
EN 16117-2:2012, Copper and copper alloys - Determination of copper content - Part 2: Electrolytic
determination of copper in materials with copper content higher than 99,80 %
EN ISO 2624:1995, Copper and copper alloys - Estimation of average grain size (ISO 2624:1990)
EN ISO 6507-1:2018, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2018)
EN ISO 6892-1:2019, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2019)
EN ISO 8493:2004, Metallic materials - Tube - Drift-expanding test (ISO 8493:1998)
EN ISO/IEC 17050-1:2010, Conformity assessment — Supplier’s declaration of conformity — Part 1:
General requirements (ISO/IEC 17050-1:2004, corrected version 2007-06-15)
EN ISO/IEC 17050-2:2004, Conformity assessment — Supplier’s declaration of conformity — Part 2:
Supporting documentation (ISO/IEC 17050-2:2004)
ISO 4741:1984, Copper and copper alloys — Determination of phosphorus content — Molybdovanadate
spectrometric method
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
seamless round copper tube
hollow semi-finished product, circular in cross-section, made of copper, having a uniform wall thickness,
which at all stages of production has a continuous periphery
[SOURCE: EN 1057:2006+A1:2010, Definition 3.1]
3.2
coil
winding in which the turns are either arranged into layers parallel to its axis such that successive turns
in a given layer are next to one another (LWC – Level Wound Coil) or are spirally arranged (SWC – Spiral
Wound Coil)
3.3
mean diameter
arithmetical mean of the maximum and minimum outside diameters through the same cross-section of
the tube
[SOURCE: EN 1057:2006+A1:2010, Definition 3.5]
3.4
deviation from circular form
difference between the maximum and minimum outside diameters measured at any one cross-section of
the tube
[SOURCE: EN 1057:2006+A1:2010, Definition 3.6]
3.5
deviation from concentricity
half of the difference between the maximum and minimum wall thicknesses at the same cross-section of
the tube
[SOURCE: EN 1057:2006+A1:2010, Definition 3.7]
3.6
production batch
definite quantity of products of the same form, the same material condition and the same cross-sectional
dimensions manufactured during the same production sequence under uniform conditions
[SOURCE: EN 1057:2006+A1:2010, Definition 3.8]
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4 Designations
4.1 Material
4.1.1 General
The material is designated either by symbol or number (see 6.1).
4.1.2 Symbol
The material symbol designation is based on the designation system given in ISO 1190-1:1982.
4.1.3 Number
The material number designation is in accordance with the system given in EN 1412:2016.
4.2 Material condition
For the purposes of this document, the following designation, which is in accordance with the system
given in EN 1173:2008, applies for the material condition (see Table 1):
R… Material condition designated by the minimum value of tensile strength requirement for the product
with mandatory tensile strength and elongation requirements.
Y. Material condition designated by the minimum value of 0,2 % proof strength requirement for the
product with mandatory 0,2 % proof strength, tensile strength, elongation and grain size requirements.
4.3 Product
The product designation provides a standardized pattern of designation from which a rapid and
unequivocal description of a product is conveyed in communication. It provides mutual comprehension
at the international level with regard to products which meet the requirements of the relevant European
Standard.
The product designation is no substitute for the full content of the standard.
The product designation for products to this document shall consist of:
— denomination (Copper tube);
— number of this document (EN 12735-2);
— material condition designation (see Table 1);
— nominal cross-sectional dimensions in millimetres: outside diameter x wall thickness (see Table 2
and Table 9);
— inner surface type (the following designations shall be used as appropriate: S for smooth, F for
finned).
The derivation of a product designation is shown in the following example.
EXAMPLE Copper tube conforming to this document, in material condition Y040 (light annealed), nominal
outside diameter 16 mm, nominal wall thickness 0,5 mm, smooth inner surface (S), will be designated as follows:
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5 Ordering information
In order to facilitate the enquiry, order and confirmation of order procedures between the purchaser and
the supplier, the purchaser shall state on his enquiry and order the following information:
a) quantity of product required (length, mass);
b) denomination (Copper tube);
c) reference to this document (EN 12735-2);
d) material condition designation (see 4.2 and Table 1);
e) nominal cross-sectional dimensions:
1) for smooth tubes: outside diameter × wall thickness (see Table 2);
2) for inner finned tubes: outside diameter (see Table 9) × wall thickness at fin root and fin height,
which shall be agreed between the purchaser and the supplier together with any other fin
parameters agreed as necessary.
f) inner surface type (smooth or finned);
g) form of delivery, straight lengths, coil (LWC or SWC) (see 10.2).
In addition, the purchaser shall also state on the enquiry and order the following, if required:
h) whether another form of delivery than g) is required;
i) whether a declaration of conformity is required (see 9.1);
j) whether an inspection document is required, and if so, which type (see 9.2).
NOTE It is advised that the product designation as described in 4.3 is used for items b) to f).
In addition, the purchaser shall also state on the enquiry and order any special requirements, if required.
EXAMPLE 1 Ordering details for 300 m copper tube conforming to EN 12735-2, in material condition Y040 (light
annealed), nominal outside diameter 16 mm, nominal wall thickness 0,5 mm, smooth inner surface (S), nominal
length 3 m, straight lengths:
300 m Copper tube EN 12735-2 – Y040 – 16 × 0,5 – S
– 3 m straight lengths
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EXAMPLE 2 Ordering details for 17 tonnes copper tube conforming to EN 12735-2, in material condition Y040
(light annealed), nominal outside diameter 9 mm, nominal wall thickness 0,28 mm, inner finned (F), 130 kg coil,
level wound (LWC):
17 tonnes Copper tube EN 12735-2 – Y040 – 9 × 0,28 – F
– 130 kg LWC
6 Requirements
6.1 Composition
The composition shall conform to the following requirements:
— Cu + Ag: min. 99,90 %;
— 0,015 % ≤ P ≤ 0,040 %.
This copper grade is designated either Cu-DHP or CW024A.
6.2 Mechanical properties and grain size
The 0,2 % proof strength, tensile strength, elongation and grain size shall conform to the requirements
given in Table 1. The tests shall be carried out in accordance with 8.2, 8.3 and 8.4.
Table 1 — Mechanical properties and grain size
Nominal Hardness
0,2 % proof Tensile
Material condition outside Elongation (indicativ Grain size
strength strength
diameter e)
d R R A HV 5
p0,2 m
common
designation
term
MPa MPa % µm
up to
and
over min. max. min. min. min. max.
includ
ing
b
3,97 108 35 80 210 40 — 30 60
soft
a
Y035
annealed
108 219 — — 210 40 —
b
3,97 108 40 90 220 40 15 40
light
Y040
annealed
108 219 — — 220 40 —
b
3,97 108 80 140 220 40 — 15 40
Y080 skin hard
108 219 — — 220 40 —
b
3,97 66,7 30
R250 half-hard — — 250 (75 to 100) — —
66,7 219 20
b
R290 hard 3,97 219 — — 290 3 (min. 100) — —
NOTE 0,2 % proof strength and grain size requirements are not mandatory for tubes with outside
diameter > 108 mm.
a
Nominal wall thickness e ≥ 0,6 mm.
b
Including 3,97.
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6.3 Dimensions and tolerances for smooth tubes
6.3.1 General
The geometrical properties of the tubes are defined by outside diameter, wall thickness and length. The
outside diameter and wall thickness shall conform to the requirements given in Table 2, Table 3 and
Table 4.
In cases of dispute, the dimensions shall be measured at a temperature of (23 ± 5) °C.
6.3.2 Nominal dimensions
The standardized nominal outside diameters and nominal wall thicknesses for smooth tubes are given in
Table 2. The recommended nominal dimensions of the length for straight length are indicated in 10.2.2.
Other dimensions can be supplied upon agreement between the purchaser and the supplier.
NOTE For reference purposes, if DN designation of size for components of a piping system is required, it can
be calculated for tubes to this document by:
DN de− 2 (1)
where
d is the nominal outside diameter in millimetres (mm)
e is the nominal wall thickness in millimetres (mm)
DN is a numerical designation of size, which is common to all components in a piping system. It is a
convenient round number for reference purposes and is only loosely related to the manufacturing
dimensions (see EN ISO 6708).
Table 2 — Nominal outside diameters and wall thicknesses for smooth tubes
Nominal outside diameter Nominal wall thickness
d e
mm
metric Imperial series
series
mm mm in 0,25 0,28 0,30 0,35 0,40 0,45 0,50 0,63 0,70 0,80 0,90 1,00 1,25 1,50 1,65 2,00 2,50 3,00
3,97 5/32 • •
4,76 3/16 • • •
5 • • •
6 • • • • •
6,35 1/4 • • • •
7 • • • •
7,94 5/16 • • • •
8 • • • • ■
9,52 3/8 • • • ■ • • • ■
10 • • • ■ • • ■ • ■
12 • • • • ■ • ■
12,7 1/2 • • • ■ • ■ • ■ • ■
12
=
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Nominal outside diameter Nominal wall thickness
d e
mm
metric Imperial series
series
mm mm in 0,25 0,28 0,30 0,35 0,40 0,45 0,50 0,63 0,70 0,80 0,90 1,00 1,25 1,50 1,65 2,00 2,50 3,00
14 ■ ■
15
15,87 5/8
16
18
19,05 3/4
20
22
22,22 7/8
25,4 1
28
...
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