Bsi bs en 10208 2 2009

refer-EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles EN 910, Destructive tests on welds in metallic materials — Bend tests EN 1

National foreword

This British Standard is the UK implementation of

It supersedes BS EN 10208-2:1997 which is withdrawn

The UK participation in its preparation was entrusted to TechnicalCommittee PSE/17/2, Transmission pipelines

A list of organizations represented on this committee can be obtained onrequest to its secretary

This publication does not purport to include all the necessary provisions

of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

EN 10208-2:2009

Tubes en acier pour conduites de fluides combustibles

-Conditions techniques de livraison - Partie 2: Tubes de la

classe de préscription B

Stahlrohre für Rohrleitungen für brennbare Medien Technische Lieferbedingungen - Teil 2: Rohre der

-Anforderungsklasse B

This European Standard was approved by CEN on 25 January 2009.

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 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 Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members.

Ref No EN 10208-2:2009: E

Contents

Foreword……… 3

Introduction……….4

1 Scope 5

2 Normative references 5

3 Terms and definitions 7

4 Symbols and abbreviations 8

5 Classification and designation 8

5.1 Classification 8

5.2 Designation 8

6 Information to be supplied by the purchaser 9

6.1 Mandatory information 9

6.2 Options 9

6.3 Example of ordering 11

7 Manufacturing 11

7.1 General 11

7.2 Steelmaking 12

7.3 Pipe manufacture 12

7.4 Heat treatment condition 12

7.5 Sizing 13

7.6 Strip end welds 14

7.7 Jointers 14

7.8 General requirements for non-destructive testing 14

8 Requirements 14

8.1 General 14

8.2 Chemical composition 14

8.3 Mechanical properties 16

8.4 Weldability 21

8.5 Appearance and soundness 21

8.6 Dimensions, masses and tolerances 22

9 Inspection 29

9.1 Types of inspection and inspection documents 29

9.2 Summary of inspection and testing 29

9.3 Selection and preparation of samples and test pieces 30

9.4 Test methods 38

9.5 Retests, sorting and reprocessing 42

10 Marking of the pipes 42

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 10208-2:1996

This European Standard consists of the following parts, under the general title Steel pipes for pipelines for combustible fluids — Technical delivery conditions:

Part 1: Pipes of requirement class A

Part 2: Pipes of requirement class B

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, Cyprus, Czech Repub-lic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom

Introduction

It was the intention, when preparing this document, to avoid specifying the quality of line pipe to be used for a

particular application However, it was recognized that there are several quality levels commonly used, and it

was decided to reflect these in the standard by the differentiation between two quality levels

Firstly, the need was recognized to provide a basic quality level This is designated requirement class A and

considered in EN 10208-1

Secondly, many purchasers impose requirements additional to the basic standard, for instance concerning

toughness and non-destructive inspection This approach is common, for example, for transmission pipelines

Such enhanced requirements are addressed in requirement class B and considered in EN 10208-2

For offshore applications and other applications outside the scope of EN 10208-1 and EN 10208-2, other

standards may be applicable, e.g ISO 3183 [1]

The Charpy impact energy requirements in this document have been derived from established data, in

accor-dance with EPRG recommendations [2], and are intended to prevent the occurrence of long running shear

fracture in pipelines transporting clean, dry natural gas It is the responsibility of the designer to decide

whether these energy requirements suffice for the intended application For example, rich gas or two-phase

fluids may require additional testing to be carried out

For pipes of requirement class B, a weld efficiency factor of 1,0 can be used in design calculations, due to the

conditions specified for the manufacture of the pipes and for the testing of the tubes

The selection of the requirement class depends on many factors: the properties of the fluid to be conveyed,

the service conditions, design code and any statutory requirements should all be taken into consideration

Therefore this document gives no detailed guidelines It is the ultimate responsibility of the user to select the

appropriate requirement class for the intended application

with the functional requirements for gas supply systems referred to in EN 1594 [3]

2 Normative references

The following referenced documents are indispensable for the application of this document For dated ences, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies

refer-EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles

EN 910, Destructive tests on welds in metallic materials — Bend tests

EN 1011-1, Welding — Recommendations for welding of metallic materials — Part 1: General guidance for arc welding

EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of ferritic steels

EN 10002-1, Metallic materials — Tensile testing — Part 1: Method of test at ambient temperature

EN 10020:2000, Definition and classification of grades of steel

EN 10021, General technical delivery conditions for steel products

EN 10027-1, Designation systems for steels — Part 1: Steel names

EN 10027-2, Designation systems for steels — Part 2: Numerical system

EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test method

EN 10052:1993, Vocabulary of heat treatment terms for ferrous products

EN 10079:2007, Definition of steel products

EN 10168, Steel products — Inspection documents — List of information and description

EN 10204, Metallic products — Types of inspection documents

EN 10220, Seamless and welded steel tubes — Dimensions and masses per unit length

EN 10246-3, Non-destructive testing of steel tubes — Part 3: Automatic eddy current testing of seamless and welded (except submerged arc welded) steel tubes for the detection of imperfections

EN 10246-5, Non-destructive testing of steel tubes — Part 5: Automatic full peripheral magnetic transducer/flux

leakage testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for the

detection of longitudinal imperfections

EN 10246-7, Non-destructive testing of steel tubes — Part 7: Automatic full peripheral ultrasonic testing of

seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections

EN 10246-8, Non-destructive testing of steel tubes — Part 8: Automatic ultrasonic testing of the weld seam of

electric welded steel tubes for the detection of longitudinal imperfections

EN 10246-9, Non-destructive testing of steel tubes — Part 9: Automatic ultrasonic testing of the weld seam of

submerged arc welded steel tubes for the detection of longitudinal and/or transverse imperfections

EN 10246-10, Non-destructive testing of steel tubes — Part 10: Radiographic testing of the weld seam of

automatic fusion arc welded steel tubes for the detection of imperfections

EN 10246-14, Non-destructive testing of steel tubes — Part 14: Automatic ultrasonic testing of seamless and

welded (except submerged arc-welded) steel tubes for the detection of laminar imperfections

EN 10246-15, Non-destructive testing of steel tubes — Part 15: Automatic ultrasonic testing of strip/plate used

in the manufacture of welded steel tubes for the detection of laminar imperfections

EN 10246-16, Non-destructive testing of steel tubes — Part 16: Automatic ultrasonic testing of the area adjacent

to the weld seam of welded steel tubes for the detection of laminar imperfections

EN 10246-17, Non-destructive testing of steel tubes — Part 17: Ultrasonic testing of tube ends of seamless and

welded steel tubes for the detection of laminar imperfections

EN 10256, Non-destructive testing of steel tubes – Qualification and competence of level 1 and 2

non-destructive testing personnel

EN 10266:2003, Steel tubes, fittings and structural hollow sections — Symbols and definitions of terms for use in

product standards

EN 10274, Metallic materials — Drop weight tear test

EN ISO 377, Steel and steel products ― Location and preparation of samples and test pieces for mechanical

testing (ISO 377:1997)

EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels

(ISO 2566-1:1984)

EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1:2005)

EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G,

3 Terms and definitions

For the purposes of this document the following terms and definitions apply in addition to or deviating from those given in EN 10020:2000, EN 10052:1993, EN 10079:2007 and EN 10266:2003

3.2

thermomechanical forming

[as in EN 10052:1992, but supplemented]

forming process in which the final deformation is carried out in a certain temperature range leading to a rial condition with certain properties which cannot be achieved or repeated by heat treatment alone

NOTE 2 The abbreviated form of this delivery condition is M (included, where applicable, in the steel name)

rates without or with tempering including self-tempering but excluding definitively direct quenching and quenching and tempering

has improved weldability properties

3.3

quenching and tempering

heat treatment comprising of quench hardening followed by tempering, where quench hardening implies tenitization followed by cooling, under conditions such that austenite transforms more or less completely into martensite and possibly into bainite

aus-NOTE 1 By tempering to specific temperatures (< Ac1) one or more times or holding at these temperatures, followed by cooling at an appropriate rate, the properties are brought to the required level

NOTE 2 The abbreviated form of this delivery condition is Q (in this document, included in the steel name)

NOTE Imperfections with a size and/or population density complying with the acceptance criteria specified in this

document are considered to have no practical implication on the intended use of the product

agreement between manufacturer and purchaser at the time of enquiry and order

4 Symbols and abbreviations

For symbols and abbreviations, see EN 10266:2003

NOTE 1 EN 10266 includes definitions of types of pipe and their abbreviations

D specified outside diameter;

Dmin (specified) minimum outside diameter;

T specified wall thickness;

Tmin (specified) minimum wall thickness

5 Classification and designation

5.1 Classification

The steel grades specified in this document are non-alloy quality or non-alloy or alloy special steels Their

classification in accordance with EN 10020 is indicated in Table 1

5.2 Designation

The specified steel grades are designated with steel names in accordance with EN 10027-1 The

correspond-ing steel numbers have been allocated in accordance with EN 10027-2

Table 1 — Classification and designation of the steel grades

Normalized or normalizing

formed

non-alloy quality steel

L245NB 1.0457 L290NB 1.0484 L360NB 1.0582

Quenched and tempered

alloy special steel

L415QB 1.8947 L450QB 1.8952 L485QB 1.8955 L555QB 1.8957

Thermomechanically rolled

non-alloy quality steel

L245MB 1.0418 L290MB 1.0429 L360MB 1.0578

alloy special steel

L415MB 1.8973 L450MB 1.8975 L485MB 1.8977 L555MB 1.8978

6 Information to be supplied by the purchaser

6.1 Mandatory information

The purchaser shall state in his enquiry and order the following minimum information:

a) quantity ordered (e.g total tonnage or total length of pipe);

b) type of pipe (see Table 2, column 1);

c) product form (i.e pipe);

d) pipe outside diameter and wall thickness in millimetres (see 8.6.1.2);

e) random length group or, if a fixed length is required, the length in millimetres (see 8.6.3.3 and Table 11); f) number of this European Standard (EN 10208-2);

g) steel name or number (see Table 1);

h) which impact energy requirements, Table 6 or Table 7, shall apply;

i) type of inspection document required (see 9.1.1)

6.2 Options

A number of options are specified in this document and these are listed below If the purchaser does not cate a wish to implement any of these options at the time of enquiry and order, the pipe shall be supplied in accordance with the basic specification (see 6.1)

indi-a) Mandatory agreement – options which shall be agreed when applicable

1) chemical composition of pipe with wall thickness T > 25 mm (see Table 3, footnote b);

2) mechanical properties of pipe with wall thickness T > 25 mm (see Table 5, footnote a);

3) impact and DWT test requirements for outside diameter D > 1 430 mm and/or wall thickness > 25 mm

(see Tables 6 and 7, footnote b);

4) diameter tolerances for seamless pipe with wall thickness T > 25 mm (see Table 9, footnote b);

5) diameter and out-of-roundness tolerances for pipe with outside diameter D > 1 430 mm (see Table 9,

columns 2 and 3);

6) party to issue the inspection document 3.2 (see 9.1.1)

b) Unless otherwise agreed – left to the discretion of the manufacturer

1) method of verification of dimensional and geometrical requirements (see 9.4.10.4);

2) timing of NDT of seamless and HFW pipe (see C.2.2);

3) radiographic inspection for the detection of longitudinal imperfections (see C.5.4 a);

c) Optional agreement – options which may be agreed

1) approval of the quality system and/or verification of the manufacturing procedure (see 7.1 and Annex A);

2) steelmaking process (see 7.2.1);

3) manufacture of SAWL pipe with two seams (see 7.3);

4) acceptance of strip end welds in SAWH/COWH pipe (see 7.6.1);

5) Mo content (see Table 3, footnote g);

6) lower CEV (see Table 3, footnote d);

7) DWT test (see Tables 6 and 7, footnote d);

8) weldability data or weld tests (see 8.4.2);

9) application of the diameter tolerance to the inside diameter (see Table 9, footnote c);

10) application of the diameter tolerance to the outside diameter (see Table 9, footnote d);

17) impact test and DWT test temperatures other than 0 °C (see 9.4.3.1 and 9.4.4);

18) substitution of the macrographic examination of the weld by alternative test methods (see 9.4.7.1);

19) hardness test during production for seam heat treated HFW pipe (see 9.4.7.2);

20) hydrostatic test pressures greater than 250 bar or 500 bar and up to 100 % of specified minimum yield strength respectively (see 9.4.8.1);

21) use of special devices for measuring the pipe diameter (see 9.4.10.1);

22) use of (cold) die stamping (see 10.1.3);

23) special marking (see 10.2);

24) coating and lining (see Clause 11);

25) acceptance level U2/C or F2, respectively for NDT of seamless pipe (see C.3.1, C.3.2);

26) use of the flux leakage test (for seamless and HFW pipe) and of the eddy current test (for HFW pipe) (see C.3.2 and C.4.1.2);

27) acceptance level U2/C (U2) for NDT of HFW pipe (see C.4.1.1);

28) acceptance level F2 for NDT of HFW pipe (see C.4.1.2 a);

29) verification of quality requirement for laminar imperfections (see C.2.4; C.4.2 and C.4.3; C.5.2 and C.5.3); 30) use of fixed depth notches for equipment calibration (see C.5.1.1 d);

31) use of hole penetrameter instead of ISO wire penetrameter (see C.5.5.1 a);

32) use of fluoroscopic inspection (C.5.5.1 b)

6.3 Example of ordering

Orders shall be preferably presented as given in the example

of 12,5 mm in a length according to random length group r2 (see Table 12), made of steel grade L415MB, impact ties in accordance with Table 7, with drop weight tear (DWT) tests and inspection certificate 3.2 in accordance with EN 10204:

proper-10 000 m SAWL pipe – 6proper-10 x 12,5 x r2 – EN proper-10208-2 – L415MB – impact properties of Table 7,

with DWT test, inspection certificate EN 10204:3.2

7.2 Steelmaking

7.2.1 The steels shall be made using the basic oxygen process or the electric furnace process

Other equivalent steelmaking processes may be used by agreement

7.2.2 The steels shall be fully killed and be made according to fine grain practice

7.3 Pipe manufacture

Acceptable types of pipe are listed together with acceptable manufacturing routes in Table 2 The type of pipe

and the type of heat treatment as given in the steel name shall be specified by the purchaser

SAWH pipes shall be manufactured using strip with a width not less than 0,8 or more than 3,0 times the pipe

outside diameter

SAWL pipe may be manufactured with two seams by agreement

7.4 Heat treatment condition

The pipes shall be delivered in one of the forming and heat treatment conditions given in Table 2

Table 2 — Type of piping and manufacturing route (starting material, pipe forming and heat treatment

conditions)

Type of pipe Starting material Pipe forming a Heat treatment condition Symbol for the heat treatment

normalizing formed

Cold forming

Normalized weld

Thermomechanically rolled strip

Thermomechanically

As rolled plate or strip

Normalized or malizing rolled plate

Db is the outside diameter before sizing;

D is the specified outside diameter

7.6 Strip end welds

7.6.1 For helical seam welded pipe, the strip end weld may be retained in the pipe, by agreement Where

accepted, the strip end weld shall be located at least 200 mm from the pipe end

7.6.2 For welded pipe with a longitudinal seam, strip end welds are not permitted in the pipe

7.7 Jointers

The delivery of jointers is not permitted

7.8 General requirements for non-destructive testing

All NDT activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel authorized to

operate by the employer

The qualification shall be in accordance with EN 10256 or, at least, an equivalent to it It is recommended that

the level 3 personnel be certified in accordance to EN 473 or, at least an equivalent to it

The operating authorization issued by the employer shall be in accordance with a written procedure

NDT operations shall be authorized by a level 3 NDT individual approved by the employer

8 Requirements

8.1 General

The requirements specified in this document apply on condition that the relevant specifications for test piece

selection, test piece preparation and test methods given in 9.3 and 9.4 are complied with

8.2 Chemical composition

8.2.1 Cast analysis

The cast analysis reported by the steel producer shall apply and comply with the requirements of Table 3

Table 3 — Chemical composition (cast analysis) a for wall thicknesses ≤ 25 mm b

Steel

d max Steels for seamless and welded pipes

L290NB 1.0484 0,17 0,40 1,20 0,025 0,020 0,05 0,05 0,04 e 0,42 L360NB 1.0582 0,20 0,45 1,60 0,025 0,020 0,10 0,05 0,04 e, f 0,45 L415NB 1.8972 0,21 0,45 1,60 0,025 0,020 0,15 0,05 0,04 e, f, g as agreed

Steels for seamless pipes L360QB 1.8948 0,16 0,45 1,40 0,025 0,020 0,05 0,05 0,04 e 0,42 L415QB 1.8947 0,16 0,45 1,60 0,025 0,020 0,08 0,05 0,04 e, f, g 0,43 L450QB 1.8952 0,16 0,45 1,60 0,025 0,020 0,09 0,05 0,06 e, f, g 0,45 L485QB 1.8955 0,16 0,45 1,70 0,025 0,020 0,10 0,05 0,06 e, f, g 0,45 L555QB 1.8957 0,16 0,45 1,80 0,025 0,020 0,10 0,06 0,06 f, h as agreed

Steels for welded pipes

L360MB 1.0578 0,16 0,45 1,60 0,025 0,020 0,05 0,05 0,04 e 0,41 L415MB 1.8973 0,16 0,45 1,60 0,025 0,020 0,08 0,05 0,06 e, f, g 0,42 L450MB 1.8975 0,16 0,45 1,60 0,025 0,020 0,10 0,05 0,06 e, f, g 0,43 L485MB 1.8977 0,16 0,45 1,70 0,025 0,020 0,10 0,06 0,06 e, f, g 0,43 L555MB 1.8978 0,16 0,45 1,80 0,025 0,020 0,10 0,06 0,06 e, f, g as agreed

a Elements not mentioned in this table shall not be added intentionally without purchaser's approval except for elements which may be added for deoxidation and finishing of the heat (see footnote e).

b Chemical composition for larger wall thicknesses up to 40 mm is to be agreed

c For each reduction of 0,01 % below the max carbon content an increase of 0,05 % manganese above the specified maximum value is permitted with a max increase of 0,2 %.

d

15

Cu Ni 5

V Mo Cr 6

Mn

C

+ + + + +

= ; the CEV is only specified for the product analysis

For grades with values higher than 0,43 a max CEV of 0,43 may be agreed.

e 0,015 ≤ Al tot < 0,060; N ≤ 0,012;

N

Al

≥ 1

2

; Cu ≤ 0,25; Ni ≤ 0,30; Cr ≤ 0,30; Mo ≤ 0,10.

f The sum of V, Nb, Ti shall not exceed 0,15 %.

g For these steel grades, a molybdenum content up to 0,35 % may be agreed

h Al, N, Al/N and Cu see footnote e; Ni ≤ 0,60; Cr ≤ 0,50; Mo ≤ 0,35.

8.2.2 Product analysis

The product analysis shall not deviate from the limiting values for the cast analysis as specified in Table 3 by more than the values given in Table 4

Table 4 — Permissible deviations of the product analysis from the specified limits on cast analysis

The pipe shall, as applicable (see Table 17, column 2), comply with the requirements given in Table 5 and

Tables 6 or 7 The purchaser shall state, at the time of enquiry and order, which impact energy

requirements, depending on the safety factor to be used, shall apply

tem-pered or thermomechanically rolled condition, an adverse change of mechanical properties can occur (see for example

3.2) Where appropriate, the purchaser should contact the manufacturer for more detailed information

factor The safety factors 1,4 and 1,6 have been chosen as typical examples in the range of commonly used safety

fac-tors

Table 5 — Requirements for the result of tensile and bend test for wall thickness T ≤ 25 mm a and for

the hydrostatic test

Steel grade

Pipe body b (seamless and welded pipes)

Weld seam (SAW and

Yield strength

Rt0,5

MPa

Tensile strength

Rm

MPa min

Rt0,5/Rm c max

Elongation d

A

% min

Diameter of the mandrel for bend test

e (see 9.4.5)

Hydrostatic test (see 9.4.8) Steel name Steel number

L245NB 1.0457

Each length

of pipe shall withstand the test without showing leakage or visible de-formation

a Mechanical properties of pipes with greater wall thicknesses up to 40 mm are to be agreed.

b The same Rm values apply for the weld seam of HFW, SAW and COW pipe

c The values for the yield strength ratio apply to the product "pipe" They cannot be required for the starting material.

d These values apply to transverse specimens taken from the pipe body When longitudinal specimens are tested (see Table 18), the values of elongation shall be 2 units higher.

e T = specified wall thickness of the pipe.

Pipe body (pipe outside diameter D in mm) Weld seam Pipe body

(D in mm)

Steel

name

Steel number

≤ 510 > 510 ≤ 610 > 610 ≤ 720 > 720 ≤ 820 > 820 ≤ 920 ≤ 1 020 > 920 > 1 020 ≤ 1 120 > 1 120 ≤ 1 220 > 1 220 ≤ 1 430 transverse to the seam D ≤ 1 430 500 < D ≤ 1 430

transverse to the pipe axis (longitudinal to the pipe axis in angular brackets)c L245NB 1.0457

40 (30) [60 (45)]

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Pipe body (pipe outside diameter D in mm) Weld seam Pipe body

≤ 510 > 510 ≤ 610 > 610 ≤ 720 > 720 ≤ 820 > 820 ≤ 920 ≤ 1 020 > 920 > 1 020 ≤ 1 120 > 1 120 ≤ 1 220 > 1 220 ≤ 1 430 transverse to the seam D ≤ 1 430 500 < D ≤ 1 430

transverse to the pipe axis (longitudinal to the pipe axis in angular brackets) c L245NB 1.0457

40 (30) [60 (45)]

L485QB 1.8955 46 (35)

[69 (52)]

50 (38) [75 (56)]

55 (41) [83 (62)] 58 (44) 62 (47) 65 (49) 68 (51) 71 (53) 77 (58) L485MB 1.8977

L555QB 1.8957 61 (46)

[92 (69)]

68 (51) [102 (77)]

76 (57) [114 (86)] 83 (62) 90 (68) 96 (72) 102 (77) 108 (81) 120 (90) L555MB 1.8978

EN 10208-2:2009 (E)

a

See Note 2 in 8.3

b

The values apply for standard test pieces For sub-size test pieces, see 9.4.3.2 The specified values without brackets are the transverse minimum average values for three tests; the

speci-fied transverse minimum individual values (75 % of the average values) are indicated in round brackets The impact requirements do not apply for the heat affected zone (HAZ)

For outside diameters D >

1 430 mm and/or wall thickness T > 25 mm values shall be agreed

8.4 Weldability

8.4.1 In view of the processes for the manufacture of pipes and of pipelines, the requirements for the

chemical composition of the steels and in particular the limiting values for the carbon equivalent CEV (see ble 3) have been selected to insure that the steels delivered in accordance with this document are weldable However, account should be taken of the fact that the behaviour of the steel during and after welding is de-pendent not only on the steel, but also on the welding consumables used and on the conditions of preparing for and carrying out the welding

Ta-8.4.2 If so agreed, the manufacturer shall supply for the type of steel concerned weldability data or perform

weld tests In the case of weld tests, the details for carrying out the tests and the acceptance criteria are also

to be agreed

8.5 Appearance and soundness

8.5.1 The pipes shall be free from defects in the finished condition

8.5.2 The internal and external surface finish of the pipes shall be typical of the manufacturing process and the heat treatment employed The surface condition shall be such that any surface imperfections requiring dress-ing can be identified

8.5.3 Surface imperfections disclosed by visual inspection shall be investigated, classified and treated as

follows:

a) imperfections with a depth equal to or less than 12,5 % of the specified wall thickness, and which do not encroach on the specified minimum wall thickness, shall be classified as acceptable imperfections and treated in accordance with B.1;

b) imperfections with a depth greater than 12,5 % of the specified wall thickness, but which do not encroach

on the specified minimum wall thickness, shall be classified as defects and shall either be dressed-out by grinding in accordance with B.2 or treated in accordance with B.3 as appropriate;

c) imperfections which encroach the specified minimum wall thickness shall be classified as defects and treated in accordance with B.3

8.5.4 Geometric deviations for the normal cylindrical contour of the pipe which occur as a result of the pipe

forming process or manufacturing operations (e.g dents, flat spots, peaks) shall not exceed the following ues:

val-a) 3 mm (flat spots, peaks and cold formed dents with sharp bottom gouges);

8.5.6 Surface imperfections may be removed, but only by grinding or machining The tube thickness in the

dressed area shall not be less than the specified minimum wall thickness All dressed areas shall blend smoothly into the contour of the tube

8.5.7 Any hard spot exceeding 50 mm in any direction shall have a hardness value less than 35 HRC

(327 HB) (see 9.4.9)

8.5.8 The acceptance criteria for imperfections detected by non-destructive testing, as required by 9.4.12,

are specified in Annex C

8.6 Dimensions, masses and tolerances

8.6.1 Dimensions

8.6.1.1 The pipes shall be delivered to the dimensions specified in the enquiry and order, within the

toler-ances given in 8.6.3 to 8.6.6

8.6.1.2 Where appropriate, the preferred outside diameters D and wall thicknesses T given in Table 8

and selected from those in EN 10220 should be ordered

8.6.1.3 For the length of pipes, see 8.6.3.3; and for the execution of the pipe ends, see 8.6.4

8.6.2 Masses

The mass per unit length may be calculated by the formula

where

M is the mass per unit length,

D is the specified outside diameter in mm,

T is the specified wall thickness in mm

The formula is based on density equal to 7,85 kg/dm3

Table 8 — Preferred outsides diameters and wall thickness

(indicated by the shadowed field)

Dimensions in mm Qutside

diameter

D

Wall thickness T

2,3 2,6 2,9 3,2 3,6 4 4,5 5 5,6 6,3 7,1 8 8,8 10 11 12,5 14,2 16 17,5 20 22,2 25 28 30 32 36 40 33,7

8.6.3 Tolerances on the pipe

8.6.3.1 Diameter and out-of-roundness

The outside diameters and the out-of-roundness of the pipes as defined in 9.4.10.2 shall be within the ance limits given in Table 9

toler-Table 9 — Tolerance on diameter and out-of-roundness

Outside diameter

D

mm

Pipe except the

± 0,5 mm or

± 0,75 % D

(whichever is the greater), but max

15 mm) for

T

D

≤ 75;

2,0 % for

a The pipe end shall be considered to include a length of 100 mm at the pipe extremities

b For seamless pipe, the values apply for wall thicknesses T ≤ 25 mm; for greater thicknesses by agreement

c Subject to agreement, the tolerance may be applied to the inside diameter for outside diameters D > 210 mm

d Unless otherwise agreed, the diameter tolerance applies to the inside diameter

e When the diameter tolerance is applied to the inside diameter, the inside diameter shall also be the basis for the out-of-roundness

requirements.

The wall thickness shall be within the tolerances given in Table 10

Table 10 — Tolerances on wall thickness

8.6.3.3 Length

8.6.3.3.1 Depending on the order, the pipes are to be delivered in random lengths or in fixed lengths

8.6.3.3.2 Random lengths shall be delivered in accordance with the requirements of the specified length groups (see Table 11)

8.6.3.3.3 Fixed lengths shall be delivered with a tolerance of ± 500 mm

Table 11 — Requirements for random length groups

Dimensions in metres Length

group

Length range for

90 % of order item a Minimum average

length of order item Shortest length of order item

8.6.4 Finish of pipe ends

8.6.4.1 All pipe ends shall be cut square and be free from harmful burrs

The out-of-squareness (see Figure 1) shall not exceed:

a) 1 mm for outside diameters D ≤ 220 mm;

b) 0,005 D, but max 1,6 mm, for outside diameters D > 220 mm

Key

1 out-of-squareness

Figure 1 — Out-of-squareness 8.6.4.2 The end faces of pipes with a wall thickness greater than 3,2 mm shall be bevelled for welding

The angle of the bevel measured from a line drawn perpendicular to the axis of the pipe shall be 30° with a

tolerance of +50° The width of the root face of the bevel shall be 1,6 mm with a tolerance of ± 0,8 mm

Other bevel preparations may be agreed

Where internal machining or grinding is carried out, the angle of the internal taper, measured from the

longitu-dinal axis, shall be not greater than:

a) as given in Table 12 (for seamless pipe);

b) 7° (for welded pipe, outside diameter D > 114,3 mm)

Table 12 — Maximum angle of internal taper for seamless pipe

Specified wall thickness T

Key

1 remaining wall thickness at the weld

a) Radial offset of strip edges (HFW pipe)

Key

1, 4 outside/inside radial offset

2, 3 outside/inside height of the weld bead

b) Radial offset and height of the weld beads of plate/strip edges (SAW and COW pipe)

Key

1 misalignment

c) Misalignment of the weld beads (SAW and COW pipe)

Figure 2 — Possible dimensional deviations of the weld seam

8.6.5.1.2 In the case of SAW and COW pipes, the maximum radial offset (see Figure 2b) of the strip/plate edges shall be as given in Table 13

Table 13 — Maximum permissible offset of SAW and COW pipes