SIST EN 12735-2:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Copper and copper alloys - Seamless, round copper tubes for air conditioning and refrigeration - Part 2: Tubes for equipmentBaker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko tehniko - 2. del: Cevi za naprave in aparateCuivre et alliages de cuivre - Tubes ronds sans soudure en cuivre pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matérielKupfer und Kupferlegierungen - Nahtlose Rundrohre aus Kupfer für die Kälte- und Klimatechnik - Teil 2: Rohre für ApparateTa slovenski standard je istoveten z:EN 12735-2:2001SIST EN 12735-2:2002en77.150.3023.040.15ICS:SLOVENSKI
STANDARDSIST EN 12735-2:200201-februar-2002







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12735-2April 2001ICS 23.040.15English versionCopper and copper alloys - Seamless, round copper tubes forair conditioning and refrigeration - Part 2: Tubes for equipmentCuivre et alliages de cuivre - Tubes ronds sans soudure encuivre pour l'air conditionné et la réfrigération - Partie 2:Tubes pour le matérielKupfer und Kupferlegierungen - Nahtlose Rundrohre ausKupfer für die Kälte- und Klimatechnik - Teil 2: Rohre fürApparateThis European Standard was approved by CEN on 6 March 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12735-2:2001 E



Page 2EN 12735-2:2001ContentsPagePageForeword .3Introduction .4
1Scope .4
2Normative references .4
3Terms and definitions .4
4Designations .5
4.1Material .5
4.2Temper .5
4.3Product .5
5Ordering information .6
6Requirements .7
6.1Composition .7
6.2Mechanical properties and grain size .7
6.3Dimensions and tolerances for smoothtubes .7
6.4Dimensions and tolerances for innergrooved tubes .11
6.5Drift expanding (for smooth tubes) .12
6.6Surface quality .12
6.7Identification of defects .12
7Sampling .13
8Test methods .13
8.1Analysis .13
8.2Tensile test .13
8.3Estimation of average grain size
......13
8.4Drift expanding test .13
8.5Residue test .13
8.6Eddy current test .14
8.7Retests .14
9Declaration of conformity and inspection documentation .14
9.1Declaration of conformity .14
9.2Inspection documentation .1410Packaging, marking and form of delivery .1510.1Packaging and marking .1510.2Form of delivery .15Annex ZA
(informative)
Clauses of this European Standard addressing essentialrequirements or other provisions of EU Directives .16Bibliography .17



Page 3EN 12735-2:2001ForewordThis European Standard has been prepared by Technical Committee CEN/TC 133 "Copper and copper alloys", thesecretariat 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 orby endorsement, at the latest by October 2001, and conflicting national standards shall be withdrawn at the latestby October 2001.Within its prgramme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 3.1 "Copper tubes" toprepare the following standard:EN 12735-2,
Copper and copper alloys — Seamless, round copper tubes for air conditioning andrefrigeration — Part 2: Tubes for equipment.This European Standard has been prepared under a mandate given to CEN by the European Commission and theEuropean 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 standard.The attention of the user of this standard is drawn to the fact that national or local regulations or practices mightrestrict the choice of dimensions and tempers in the application of products conforming to this standard.This is one of a series of European Standards for copper and copper alloy tubes. Other products are specified asfollows:EN 1057,
Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and heatingapplications. 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.prEN 13348,
Copper and copper alloys — Seamless, round copper tubes for medical gases.prEN 13349,
Copper and copper alloys — Pre-insulated copper tubes with solid covering. prEN 13600,
Copper and copper alloys — Seamless copper tubes for electrical purposes.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.



Page 4EN 12735-2:2001IntroductionIt is recommended that tubes manufactured to this standard are certified as conforming to the requirements of thisstandard based on continuing surveillance which should be coupled with an assessment of a supplier's qualitymanagement system against EN ISO 9001.1
ScopeThis European Standard specifies the requirements, sampling, test methods and conditions of delivery for seamlessround copper tubes, smooth or inner grooved, used for heat exchangers and their internal connecting pipes in themanufacturing of refrigeration and air conditioning equipment.2
Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 1655, Copper and copper alloys — Declarations of conformity.EN 1971, Copper and copper alloys — Eddy current test for tubes. EN 10002-1, Metallic materials — Tensile testing — Part 1: Method of test (at ambient temperature).EN 10204, Metallic products — Types of inspection documents.EN 10234, Metallic materials — Tube — Drift expanding test.EN ISO 2624, Copper and copper alloys — Estimation of average grain size (ISO 2624 : 1990).NOTE
Informative references to documents used in the preparation of this standard, and cited at the appropriate places in thetext, are listed in the bibliography.3
Terms and definitionsFor the purposes of this standard, the following terms and definitions apply:3.1 seamless round copper tubehollow semi-finished product, circular in cross-section, made of copper, having a uniform wall thickness, which at allstages of production has a continuous peripheryNOTE
The inner surface of the tube may be enhanced, for example by grooves.3.2 level wound coil (LWC)coil in which the turns are wound into layers parallel to the axis of the coil such that successive turns in a given layerare next to one another3.3
mean diameterarithmetical mean of any two diameters normal to each other at the same cross-section of the tube



Page 5EN 12735-2:20013.4 deviation from circular formdifference between the maximum and minimum outside diameters measured at any one cross-section of the tube3.5 deviation from concentricityhalf of the difference between the maximum and minimum wall thicknesses at the same cross-section of the tube3.6
production batchdefinite quantity of products of the same form, the same temper and the same cross-sectional dimensions manufac-tured during the same production sequence under uniform conditions4 Designations4.1 Material4.1.1 GeneralThe material is designated either by symbol or number (see 6.1).4.1.2 SymbolThe material symbol designation is based on the designation system given in ISO 1190-1.NOTE
Although the material symbol designation used in this standard might be the same as that in other standards using thedesignation system given in ISO 1190-1, the detailed composition requirements are not necessarily the same.4.1.3 NumberThe material number designation is in accordance with the system given in EN 1412.4.2
TemperFor the purposes of this standard, the following designation, which is in accordance with the system given inEN 1173, applies for the material temper (see Table 1):Y. Temper designated by the minimum value of 0,2% proof strength requirement for the product with mandatory0,2% proof strength, tensile strength, elongation and grain size requirements.4.3
ProductThe product designation provides a standardized pattern of designation from which a rapid and unequivocaldescription of a product is conveyed in communication. It provides mutual comprehension at the international levelwith 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 standard shall consist of:–denomination (Copper tube);–number of this European Standard (EN 12735-2);–temper designation (see Table 1);–nominal cross-sectional dimensions: outside diameter × wall thickness (see Tables 2 and 7);–inner surface type (the following designations shall be used as appropriate: S for smooth, G for inner grooved).The derivation of a product designation is shown in the following example.



Page 6EN 12735-2:2001EXAMPLE
Copper tube conforming to this standard, in temper Y040 (light annealed), nominal outside diameter 16 mm, nominalwall thickness 0,5 mm, smooth inner surface, shall be designated as follows:5
Ordering informationIn 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)number of this European Standard (EN 12735-2);d)temper designation (see 4.2 and Table 1);e)nominal cross-sectional dimensions,–for smooth tubes: outside diameter × wall thickness (see Table 2);–for inner grooved tubes: outside diameter (see Table 7) × wall thickness at groove root and groove depth,which shall be agreed between the purchaser and the supplier together with any other groove parametersagreed as necessary.f)inner surface type (smooth or grooved);g)form of delivery (see 10.2).NOTE
It is recommended 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 temper Y040 (light annealed), nominaloutside diameter 16 mm, nominal wall thickness 0,5 mm, smooth inner surface, nominal length 3 m, straight lengths:300 m Copper tube EN 12735-2 – Y040 – 16 × 0,5 – S– 3 m straight lengthsEXAMPLE 2
Ordering details for 17 tonnes copper tube conforming to EN 12735-2, in temper Y040 (light annealed), nominaloutside diameter 9 mm, nominal wall thickness 0,28 mm, inner grooved, 130 kg level wound coils:17 tonnes Copper tube EN 12735-2– Y040 – 9 × 0,28 – G– 130 kg LWC



Page 7EN 12735-2:20016
Requirements6.1
CompositionThe 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 sizeThe 0,2% proof strength, tensile strength, elongation and grain size shall conform to the requirements given inTable 1. The tests shall be carried out in accordance with 8.2 and 8.3.Table 1 — Mechanical properties and grain sizeTemper0,2% proof strengthTensileElongationstrengthGrain sizeRp0,2RmA aDesignationCommon terminMPaMPa%µmaccordancewithEN 1173min.max.min.min.min.max.Y080 bSkin hard80140220401540Y040Light annealed40
90220401540Y035 cSoft annealed35
80210403060NOTE 1
MPa is equivalent to 1 N/mm2.aThe original gauge length (L0) is calculated proportionally using the formula L0 = k
where k has the value 5,65, except that the minimum gauge
originalcross sectionalareaofthetestpiece(S0),length used shall be 30 mm.bStraight lengths onlycNominal wall thickness e ³ 0,6 mm6.3
Dimensions and tolerances for smooth tubes6.3.1
GeneralThe geometrical properties of the tubes are defined by outside diameter, wall thickness and for straight lengths, alsoby length.NOTE
For reference purposes, if DN designation of size for components of a pipework system is required, it can be calculatedfor tubes to this standard by: Nominal outside diameter (d) – 2 × nominal wall thickness (e) DN is defined as a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore oroutside diameter of the end connections.In cases of dispute, the dimensions shall be measured at a temperature of (23 ± 5) °C.



Page 8EN 12735-2:20016.3.2
Nominal dimensionsThe standardized nominal outside diameters and nominal wall thicknesses for smooth tubes are given in Table 2.Other designs and dimensions can be agreed between the purchaser and the supplier.Table 2 — Nominal outside diameters and wall thicknesses for smooth tubesNominaloutside diameterNominal wall thicknessdemmmetricimperial
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