SIST EN 12735-2:2016
(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 European Standard 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.
The tubes are supplied in straight length in the material conditions hard, half-hard or skin hard or as coils in the material conditions light annealed or soft annealed.
Kupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik - Teil 2: Rohre für Apparate
Diese Europäische Norm 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.
Sie gilt für Rohre mit einem Außendurchmesser von 3,97 mm bis 219 mm.
ANMERKUNG Die Rohre werden in geraden Längen, im Zustand hart oder halbhart oder durch Richten gehärtet, oder als Spulen, im Zustand leicht geglüht oder weich geglüht, geliefert.
Cuivre et alliages de cuivre - Tubes ronds sans soudure pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matériel
La présente Norme européenne spécifie les exigences, le mode d'échantillonnage, les méthodes d'essai et les conditions de livraison applicables aux tubes ronds sans soudure en cuivre à intérieur lisse ou rainuré, utilisés pour les échangeurs thermiques et leurs raccordements intérieurs dans la fabrication des matériels de réfrigération et de conditionnement d'air.
Elle s’applique aux tubes ayant un diamètre extérieur de 3,97 mm à 219 mm inclus.
NOTE Ces tubes sont livrés en longueurs droites à l'état dur, demi-dur ou écroui en surface ou bien en couronnes à l'état recuit (1/4 dur ou recuit).
Baker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko tehniko - 2. del: Cevi za naprave in aparate
Ta evropski standard določa zahteve, postopek vzorčenja, preskusne metode in pogoje za dobavo nevarjenih okroglih bakrenih cevi, gladkih ali notranje orebrenih, ki se uporabljajo za toplotne prenosnike, ter njihove notranje priključene cevi v proizvodnji hladilne in klimatske opreme.
Uporablja se tudi za cevi z zunanjim premerom od 3,97 mm do vključno 219 mm.
Cevi so dobavljene v ravnih presekih v trdem, poltrdem ali površinsko ojačanem stanju ali v navojih v svetlo žarjenem ali mehko žarjenem stanju.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Baker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko tehniko - 2. del: Cevi za naprave in aparateKupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik - Teil 2: Rohre für ApparateCuivre et alliages de cuivre - Tubes ronds sans soudure pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matérielCopper and copper alloys - Seamless, round tubes for air conditioning and refrigeration - Part 2: Tubes for equipment77.150.30Bakreni izdelkiCopper products23.040.15Cevi iz neželeznih kovinNon-ferrous metal pipesICS:Ta slovenski standard je istoveten z:EN 12735-2:2016SIST EN 12735-2:2016en,fr,de01-september-2016SIST EN 12735-2:2016SLOVENSKI
STANDARDSIST EN 12735-2:20101DGRPHãþD
SIST EN 12735-2:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12735-2
June
t r s x ICS
t uä r v rä s w Supersedes EN
s t y u wæ tã t r s rEnglish Version
Copper and copper alloys æ Seamlessá round tubes for air conditioning and refrigeration æ Part
tã Tubes for equipment Cuivre et alliages de cuivre æ Tubes ronds sans soudure pour l 5air conditionné et la réfrigération æ Partie
tã Tubes pour le matériel
Kupfer und Kupferlegierungen æ Nahtlose Rundrohre für die Kälteæ und Klimatechnik æ Teil
tã Rohre für Apparate This European Standard was approved by CEN on
t z February
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t y u wæ tã t r s x ESIST EN 12735-2:2016
EN 12735-2:2016 (E) 2 Contents Page European foreword . 4 Introduction . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 8 4 Designations. 8 4.1 Material . 8 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 . 11 6.4 Dimensions and tolerances for inner finned tubes . 17 6.5 Drift expanding (for smooth tubes) . 18 6.6 Freedom from defects . 18 6.7 Surface quality. 19 7 Sampling . 19 8 Test methods . 20 8.1 Analysis . 20 8.2 Tensile test . 20 8.3 Hardness test . 20 8.4 Estimation of average grain size . 20 8.5 Drift expanding test . 20 8.6 Carbon content test . 20 8.7 Freedom from defects test . 20 8.8 Retests . 21 9 Declaration of conformity and inspection documentation . 21 9.1 Declaration of conformity . 21 9.2 Inspection documentation . 21 10 Packaging, marking and form of delivery . 21 10.1 Packaging and marking . 21 10.2 Form of delivery . 22 Annex A (normative)
Freedom from defects test . 23 A.1 Eddy current test . 23 A.1.1 General . 23 A.1.2 Detection for non-local defects on coiled tubes . 23 A.2 Hydrostatic test . 24 SIST EN 12735-2:2016
EN 12735-2:2016 (E) 3 A.3 Pneumatic test . 24 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of Directive 2014/68/EU aimed to be covered . 25 Bibliography . 26
Tables Table 1 — Mechanical properties and grain size . 11 Table 2 — Nominal outside diameters and wall thicknesses for smooth tubes . 13 Table 3 — Tolerances on outside diameter for smooth tubes in straight length . 14 Table 4 — Tolerances on mean outside diameter for smooth tubes in coils . 14 Table 5 — Tolerances on wall thickness for smooth tubes . 15 Table 6 — Tolerances on wall thickness . 15 Table 7 — Tolerances on length for tubes supplied in straight lengths . 16 Table 8 — Maximum deviation from circular form expressed as percentage of the nominal outside diameter . 16 Table 9 — Recommended nominal outside diameters for inner finned tubes . 17 Table 10 — Testing of drift expanding . 18 Table 11 — Permissible number of defects for coils . 19 Table 12 — Coil and reel dimensions . 22 Table A.1 — Maximum drill diameters for reference standard tube . 23 Table A.2 — Hydrostatic pressure test . 24 Table ZA.1 — Correspondence between this European Standard and Annex I of Directive 2014/68/EU . 25
SIST EN 12735-2:2016
EN 12735-2:2016 (E) 4 European foreword This document (EN 12735-2:2016) has been prepared by Technical Committee CEN/TC 133 “Copper and copper alloys”, 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 December 2016 and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12735-2:2010. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of Directive 2014/68/EU, Pressure Equipment Directive (PED). For relationship with Directive 2014/68/EU, see informative Annex ZA, which is an integral part of this document. Within its programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 3 "Copper tubes (installation and industrial)" to revise EN 12735-2:2010. In comparison with the first edition of EN 12735-2:2010, the following significant technical changes were made: a) The size range of the outside diameter has been increased from 3,97 mm up to 219 mm; b) Dimensions and tolerances for smooth tubes have been modified in Tables 2, 4 and 5. The tolerances given in Tables 3 and 6 have been added; c) Nominal outside diameters have been added to Table 1. 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. 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 SIST EN 12735-2:2016
EN 12735-2:2016 (E) 5 — 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 According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12735-2:2016
EN 12735-2:2016 (E) 6 Introduction It is recommended that tubes manufactured to this standard are certified as conforming to the requirements of this European Standard based on continuing surveillance which should be coupled with an assessment of a supplier's quality management system such as EN ISO 9001. NOTE It is advised to take appropriate precautions if applying insulating material because it could be detrimental to the copper tube. SIST EN 12735-2:2016
EN 12735-2:2016 (E) 7 1 Scope This European Standard 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 in the material conditions hard, half-hard or skin hard or as coils in the material conditions light annealed or soft annealed. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 723, Copper and copper alloys - Combustion method for determination of the carbon content on the inner surface of copper tubes or fittings EN 1173, Copper and copper alloys - Material condition designation EN 1655, Copper and copper alloys - Declarations of conformity EN 1971-1, 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, 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 ISO 2624, Copper and copper alloys - Estimation of average grain size (ISO 2624) EN ISO 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1) EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1) EN ISO 8493, Metallic materials - Tube - Drift-expanding test (ISO 8493) ISO 1553, Unalloyed copper containing not less than 99,90 % of copper - Determination of copper content - Electrolytic method ISO 4741, Copper and copper alloys - Determination of phosphorus content - Molybdovanadate spectrometric method SIST EN 12735-2:2016
EN 12735-2:2016 (E) 8 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 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 either are 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] 4 Designations 4.1 Material 4.1.1 General The material is designated either by symbol or number (see 6.1). SIST EN 12735-2:2016
EN 12735-2:2016 (E) 9 4.1.2 Symbol The material symbol designation is based on the designation system given in ISO 1190-1. 4.1.3 Number The material number designation is in accordance with the system given in EN 1412. 4.2 Material condition For the purposes of this European Standard, the following designation, which is in accordance with the system given in EN 1173, 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 European Standard shall consist of: — denomination (Copper tube); — number of this European Standard (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 European Standard, 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: Copper tube EN 12735-2 — Y040 — 16 × 0,5 — S Denomination Number of this European Standard Material condition designation Nominal cross-sectional dimensions in millimetres Inner surface type SIST EN 12735-2:2016
EN 12735-2:2016 (E) 10 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 European Standard (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 × 0,5 — S
— 3 m straight lengths 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 × 0,28 — F
— 130 kg LWC SIST EN 12735-2:2016
EN 12735-2:2016 (E) 11 6 Requirements 6.1 Composition The composition shall conform to the following requirements: — Cu + Ag: min. 99,90 %; — 0,015 %
¶ P
¶
rá r v r %. 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 Material condition Nominal outside diameter 0,2 % proof strength Tensile strength Elongation Hardness (indicative) Grain size designation common term d Rp0,2 Rm A HV 5
MPa MPa %
µm
min. max. min. max. min. min.
min. max. Y035a soft annealed 3,97 108 35 80 210 40
30 60 Y040 light annealed 3,97 108 40 90 220 40
15 40 Y080b skin hard 3,97 108 80 140 220 40
15 40 R250a half-hard 3,97 66,7 — — 250 30 (75 to 100) — — 66,7 219 20 R290a hard 3,97 219 — — 290 3 (min. 100) — — NOTE 1 Hardness figures in parentheses are only requirements of this European Standard when they are agreed between purchaser and supplier, otherwise they are given for guidance purposes only. NOTE 2 1 MPa is equivalent to 1 N/mm2. NOTE 3 Tolerances for tubes with a nominal outside diameter higher than 108 mm in material condition R220 (annealed) are not specified. a Nominal wall thickness e
·
rá x mm. b Straight lengths only. 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. SIST EN 12735-2:2016
EN 12735-2:2016 (E) 12 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 European Standard by: =−DN2de (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). SIST EN 12735-2:2016
EN 12735-2:2016 (E) 13 Table 2 — Nominal outside diameters and wall thicknesses for smooth tubes Nominal outside diameter Nominal wall thickness d e
mm metric series imperial 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
¼
7
7,94
5/16
8
v
9,52
§
v
v
10
v
v
v
12
v
v
12,7
½
v v v
v
14
v
v
15
15,87
¨
v
v
v
16
v v
v
v
18
v
v
19,05
¾
v
v
20
v
v
v
22
v
v
v
22,22
©
v
25,4
1
v
28
v
28,57
s ¦
v v
34,92
s §
v
35
v
41,27
s ¨
v
42
v
53,97
t ¦
v
v
54
v
64
v
66,67
t ¨
v
76,1
v
79,37
u ¦
v
v
88,90 3 ½
v
92,07
u ¨
v
v
104,77
v ¦
v
v
108
v
133
v 159
v
v 219
v v Available in straight lengths
NOTE This table is a first step towards a standard including only metric values. SIST EN 12735-2:2016
EN 12735-2:2016 (E) 14 6.3.3 Tolerances on mean outside diameter The mean outside diameter shall conform to the tolerances given in Table 3 and Table 4. Table 3 — Tolerances on outside diameter for smooth tubes in straight length Dimensions in millimetres Nominal outside diameter d Tolerances on nominal outside diameter applicable to mean diameter applicable to any diameter a
Material condition over up to all c R290 R250
and including (hard) (half-hard) 3,97 b 18 ± 0,04 ± 0,04 ± 0,09 18 28 ± 0,05 ± 0,06 ± 0,10 28 54 ± 0,06 ± 0,07 ± 0,11 54 76,1 ± 0,07 ± 0,10 ± 0,15 76,1 88,9 ± 0,07 ± 0,15 ± 0,20 88,9 108 ± 0,07 ± 0,20 ± 0,30 108 159 ± 0,20 ± 0,70 ± 1,0 159 219 ± 0,60 ± 1,50 ± 2,00 NOTE Tolerances for tubes with a nominal outside diameter higher than 108 mm in material condition Y035 (soft annealed), Y040 (light annealed) and Y080 (skin hard) are not specified. a Including deviation from circular form. b Including 3,97. c No tolerances on deviation from circular form are applicable to R220 (annealed) material condition tubes except coiled
tubes with diameters up to and including 16 mm (see 6.3.7.1). Table 4 — Tolerances on mean outside diameter for smooth tubes in coils Dimensions in millimetres Nominal outside diameter Nominal outside diameter d e
¶
rá v e > 0,4 over up to and including
3,97a 13 ± 0,04 ± 0,04 13 16 ± 0,05 ± 0,04 16 28 — ± 0,07 a Including 3,97. 6.3.4 Tolerances on wall thickness The tolerance on the wall thickness, as measured at any point shall conform to the requirements given in Table 5 and Table 6. SIST EN 12735-2:2016
EN 12735-2:2016 (E) 15 Table 5 — Tolerances on wall thickness for smooth tubes Dimensions in millimetres Tolerances Nominal outside diameter Nominal wall thickness e
d from 0,25 up to and including over 0,30 up to and including over 0,35 up to and including over 0,40 up to and including over 0,50 up to and including over 0,63 up to and including over 0,80 up to and including over 1,50 up to and including over up to and including
0,30 0,35 0,40 0,50 0,63 0,80 1,50 3,00 Maximum permissible deviation at any pointa 3,97c 54 ± 0,025 ± 0,03 ± 0,03 ± 0,04 ± 0,05 ± 0,06 ± 8 %b ± 15 %b Tolerances on mean wall thickness 3,97c 9,52 ± 0,01 ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 9,52 13 — ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 13 16 — — ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 16 22 — — — — — ± 0,02 ± 0,05 — 22 40 — — — — — ± 0,02 ± 0,05 — 40 54 — — — — — — ± 0,08 ± 0,10 a Including deviation from concentricity. b Value in percentage of nominal thickness. c Including 3,97. Table 6 — Tolerances on wall thickness Nominal outside diameter Nominal wall thickness e a d e < 1 mm e
·
s mm mm % % > 54 ± 10 ± 15 NOTE Concentricity (uniformity of wall thickness) is controlled by tolerance on wall thickness. a Including deviation from concentricity. 6.3.5 Tolerances on the mass for tubes supplied in coils Per delivery, if the order specifies the nominal mass of the coil, none of the coils shall weigh less than 50 % of the nominal mass, and not more than 20 % of the coi
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Baker in bakrove zlitine - Nevarjene okrogle bakrene cevi za hladilno in klimatsko tehniko - 2. del: Cevi za naprave in aparateKupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik - Teil 2: Rohre für ApparateCuivre et alliages de cuivre - Tubes ronds sans soudure pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matérielCopper and copper alloys - Seamless, round tubes for air conditioning and refrigeration - Part 2: Tubes for equipment77.150.30Bakreni izdelkiCopper products23.040.15Cevi iz neželeznih kovinNon-ferrous metal pipesICS:Ta slovenski standard je istoveten z:FprEN 12735-2kSIST FprEN 12735-2:2015en,fr,de01-oktober-2015kSIST FprEN 12735-2:2015SLOVENSKI
STANDARD
kSIST FprEN 12735-2:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 12735-2
August 2015 ICS 23.040.15 Will supersede EN 12735-2:2010English 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 pour l'air conditionné et la réfrigération - Partie 2: Tubes pour le matériel
Kupfer und Kupferlegierungen - Nahtlose Rundrohre für die Kälte- und Klimatechnik - Teil 2: Rohre für Apparate This draft European Standard is submitted to CEN members for unique acceptance procedure. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey 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
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FprEN 12735-2:2015 (E) 2 Contents Page European foreword .4 Introduction .6 1 Scope .7 2 Normative references .7 3 Terms and definitions .7 4 Designations .8 4.1 Material .8 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 . 11 6.4 Dimensions and tolerances for inner finned tubes . 17 6.5 Drift expanding (for smooth tubes). 18 6.6 Freedom from defects . 19 6.7 Surface quality . 20 7 Sampling . 20 8 Test methods . 20 8.1 Analysis . 20 8.2 Tensile test . 20 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 Annex A (normative)
Freedom from defects test . 24 A.1 Eddy current test . 24 A.1.1 General . 24 A.1.2 Detection for non-local defects on coiled tubes . 24 A.2 Hydrostatic test . 25 A.3 Pneumatic test . 25 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC Pressure Equipment Directive (PED) . 26 kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 3 Bibliography . 27
Tables Table 1 — Mechanical properties and grain size . 11 Table 2 — Nominal outside diameters and wall thicknesses for smooth tubes . 13 Table 3 — Tolerances on outside diameter for smooth tubes in straight length . 14 Table 4 — Tolerances on mean outside diameter for smooth tubes in coils . 14 Table 5 — Tolerances on wall thickness for smooth tubes . 15 Table 6 — Tolerances on wall thickness . 15 Table 7 — Tolerances on length for tubes supplied in straight lengths . 16 Table 8 — Maximum deviation from circular form expressed as percentage of the nominal outside diameter. 16 Table 9 — Recommended nominal outside diameters for inner finned tubes . 18 Table 10 — Testing of drift expanding . 19 Table 11 — Permissible number of defects for coils . 20 Table 12 — Coil and reel dimensions . 23 Table A.1 — Maximum drill diameters for reference standard tube . 24 Table A.2 — Hydrostatic pressure test . 25 Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC Pressure Equipment Directive (PED) . 26
kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 4 European foreword This document (FprEN 12735-2:2015) 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 Unique Acceptance Procedure. This document will supersede EN 12735-2:2010. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC Pressure Equipment Directive (PED). For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this document. Within its programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 3 "Copper tubes (installation and industrial)" to revise EN 12735-2:2010. In comparison with the first edition of EN 12735-2:2010, the following significant technical changes were made: a) The size range of the outside diameter has been increased from 3,97 mm up to 219 mm; b) Dimensions and tolerances for smooth tubes have been modified in Tables 2, 4 and 5. The tolerances given in Tables 3 and 6 have been added; c) Nominal outside diameters have been added to Table 1. This European Standard “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. 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 kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 5 — 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 kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 6 Introduction It is recommended that tubes manufactured to this standard are certified as conforming to the requirements of this European Standard based on continuing surveillance which should be coupled with an assessment of a supplier's quality management system against EN ISO 9001. NOTE It is advised to take appropriate precautions if applying insulating material because it could be detrimental to the copper tube. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 7 1 Scope This European Standard 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. The tubes are supplied in straight length in the material conditions hard, half-hard or skin hard or as coils in the material conditions light annealed or soft annealed. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 723, Copper and copper alloys — Combustion method for determination of the carbon content on the inner surface of copper tubes or fittings EN 1057:2006+A1:2010, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and heating applications EN 1173, Copper and copper alloys — Material condition designation EN 1655, Copper and copper alloys — Declarations of conformity EN 1971-1, 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, 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 ISO 2624, Copper and copper alloys — Estimation of average grain size (ISO 2624) EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1) EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO 6892-1) EN ISO 8493, Metallic materials — Tube — Drift-expanding test (ISO 8493) ISO 1553, Unalloyed copper containing not less than 99,90 % of copper — Determination of copper content — Electrolytic method ISO 4741, Copper and copper alloys — Determination of phosphorus content — Molybdovanadate spectrometric method 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 8 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 either are 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] 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. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 9 4.1.3 Number The material number designation is in accordance with the system given in EN 1412. 4.2 Material condition For the purposes of this European Standard, the following designation, which is in accordance with the system given in EN 1173, 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 European Standard shall consist of: — denomination (Copper tube); — number of this European Standard (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 European Standard, in material condition Y040 (light annealed), nominal outside diameter 16 mm, nominal wall thickness 0,5 mm, smooth inner surface (S), shall be designated as follows: Copper tube EN 12735-2 — Y040 — 16 × 0,5 — S Denomination Number of this European Standard Material condition designation Nominal cross-sectional dimensions in millimetres Inner surface type kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 10 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 European Standard (EN 12735-2); d) material condition designation (see 4.2 and Table 1); e) nominal cross-sectional dimensions, — for smooth tubes: outside diameter × wall thickness (see Table 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 × 0,5 — S
— 3 m straight lengths 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 × 0,28 — F
— 130 kg LWC kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 11 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 Material condition Nominal outside diameter 0,2 % proof strength Tensile strength Elongation Hardness (indicative) Grain size designation common term d Rp0,2 Rm A HV 5
MPa MPa %
µm
min. max. min. max. min. min.
min. max. Y035a soft annealed 3,97 108 35 80 210 40
30 60 Y040 light annealed 3,97 108 40 90 220 40
15 40 Y080b skin hard 3,97 108 80 140 220 40
15 40 R250a half-hard 3,97 66,7 — — 250 30 (75 to 100) — — 66,7 219 20 R290a hard 3,97 219 — — 290 3 (min. 100) — — NOTE 1 Hardness figures in parentheses are only requirements of this European Standard when they are agreed between purchaser and supplier, otherwise they are given for guidance purposes only. NOTE 2 1 MPa is equivalent to 1 N/mm2. NOTE 3 Tolerances for tubes with a nominal outside diameter higher than 108 mm in material condition R220 (annealed) are not specified. a Nominal wall thickness e ≥ 0,6 mm. b Straight lengths only. 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. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 12 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 European Standard by: DN2de=− (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). kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 13 Table 2 — Nominal outside diameters and wall thicknesses for smooth tubes Nominal outside diameter Nominal wall thickness d e
mm metric series imperial 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
¼
• • • •
7
• • • •
7,94
5/16
• • • •
8
• • • • v
9,52
ê
• • • v • •
• v
10
• • • v • • v
• v
12
• • • • v • v
12,7
½
• • • v • v • v • v
14
v
v
15
• • • •
15,87
ë
• • • v • • v
v
16
• • • v v • v
v
18
• • v
v
19,05
¾
v
v
20
v
v
v
22
v
v • v
22,22
ì
v
25,4
1
v
28
v
•
28,57
1 é
v v
34,92
1 ê
v
35
v
41,27
1 ë
v
42
v
53,97
2 é
v
v
54
v
64
v
66,67
2 ë
v
76,1
v
79,37 P é
v
v
88,90 3 ½
v
92,07 P ë
v
v
104,77 4 é
v
v
108
v
133
v 159
v
v 219
v v Available in straight lengths • Available in coils NOTE This table is a first step towards a standard including only metric values. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 14 6.3.3 Tolerances on mean outside diameter The mean outside diameter shall conform to the tolerances given in Table 3 and Table 4. Table 3 — Tolerances on outside diameter for smooth tubes in straight length Dimensions in millimetres Nominal outside diameter d Tolerances on nominal outside diameter applicable to mean diameter applicable to any diameter a
Material condition over up to all c R290 R250
and including (hard) (half-hard) 3,97 b 18 ± 0,04 ± 0,04 ± 0,09 18 28 ± 0,05 ± 0,06 ± 0,10 28 54 ± 0,06 ± 0,07 ± 0,11 54 76,1 ± 0,07 ± 0,10 ± 0,15 76,1 88,9 ± 0,07 ± 0,15 ± 0,20 88,9 108 ± 0,07 ± 0,20 ± 0,30 108 159 ± 0,20 ± 0,70 ± 1,0 159 219 ± 0,60 ± 1,50 ± 2,00 NOTE Tolerances for tubes with a nominal outside diameter higher than 108 mm in material condition Y035 (soft annealed), Y040 (light annealed) and Y080 (skin hard) are not specified. a Including deviation from circular form. b Including 3,97. c No tolerances on deviation from circular form are applicable to R220 (annealed) material condition tubes except coiled tubes with diameters up to and including 16 mm (see 6.3.7.1). Table 4 — Tolerances on mean outside diameter for smooth tubes in coils Dimensions in millimetres Nominal outside diameter Nominal outside diameter d e ≤ 0,4 e > 0,4 over up to and including
3,97a 13 ± 0,04 ± 0,04 13 16 ± 0,05 ± 0,04 16 28 — ± 0,07 a Including 3,97. 6.3.4 Tolerances on wall thickness The tolerance on the wall thickness, as measured at any point shall conform to the requirements given in Table 5 and Table 6. kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 15 Table 5 — Tolerances on wall thickness for smooth tubes Dimensions in millimetres Tolerances Nominal outside diameter Nominal wall thickness e
d from 0,25 up to and including over 0,30 up to and including over 0,35 up to and including over 0,40 up to and including over 0,50 up to and including over 0,63 up to and including over 0,80 up to and including over 1,50 up to and including over up to and including
0,30 0,35 0,40 0,50 0,63 0,80 1,50 3,00 Maximum permissible deviation at any pointa 3,97c 54 ± 0,025 ± 0,03 ± 0,03 ± 0,04 ± 0,05 ± 0,06 ± 8 %b ± 15 %b Tolerances on mean wall thickness 3,97c 9,52 ± 0,01 ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 9,52 13 — ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 13 16 — — ± 0,01 ± 0,015 ± 0,02 ± 0,02 — — 16 22 — — — — — ± 0,02 ± 0,05 — 22 40 — — — — — ± 0,02 ± 0,05 — 40 54 — — — — — — ± 0,08 ± 0,10 a Including deviation from concentricity. b Value in percentage of nominal thickness. c Including 3,97. Table 6 — Tolerances on wall thickness Nominal outside diameter Nominal wall thickness e a d e < 1 mm e ≥ 1 mm mm % % > 54 ± 10 ± 15 NOTE Concentricity (uniformity of wall thickness) is controlled by tolerance on wall thickness. a Including deviation from concentricity. 6.3.5 Tolerances on the mass for tubes supplied in coils Per delivery, if the order specifies the nominal mass of the coil, none of the coils shall weigh less than 50 % of the nominal mass, and not more than 20 % of the coils shall weigh less than 70 % of the nominal mass. EXAMPLE For delivery of 10 coils, nominal mass 130 kg: No coil shall have a mass lower than 65 kg (50 % of nominal) and 2 maximum (20 %) a mass lower than 91 kg (70 % of nominal). 6.3.6 Tolerances on length for tubes supplied in straight lengths Straight tubes may be delivered: kSIST FprEN 12735-2:2015
FprEN 12735-2:2015 (E) 16 — in production approximate lengt
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