Welded steel tubes for pressure purposes - Technical delivery conditions - Part 6: Submerged arc welded non-alloy steel tubes with specified low temperature properties

This document specifies the technical delivery conditions for two test categories of submerged arc longitudinally (SAWL) or helically (SAWH) welded tubes of circular cross section, with specified low temperature properties, made from non-alloy quality steel.
NOTE 1   These tube grades are intended to support the essential requirements of EU Directive 2014/68/EU in respect of pressure equipment with specified low temperature properties (see Table 5), covered under all relevant Categories as set out in Article 13 of that Directive.
NOTE 2   Once this standard is published in the Official Journal of the European Union (OJEU), presumption of conformity to the Essential Safety Requirements (ESR) of Directive 2014/68/EU is limited to the technical data for the materials in this standard and does not presume adequacy of the material for a specific item of pressure equipment. Consequently, the assessment of the technical data stated in this material standard against the design requirements of this specific item of equipment to verify that the ESRs of the Pressure Equipment Directive are satisfied, needs to be done by the designer or manufacturer of the pressure equipment, taking also into account the subsequent manufacturing processes which may affect properties of the base materials.

Geschweißte Stahlrohre für Druckbeanspruchungen - Technische Lieferbedingungen - Teil 6: Unterpulvergeschweißte Rohre aus unlegierten Stählen mit festgelegten Eigenschaften bei tiefen Temperaturen

Dieses Dokument legt die technischen Lieferbedingungen für unterpulvergeschweißte Rohre mit Längsnaht (SAWL) und Spiralnaht (SAWH) mit kreisförmigem Querschnitt aus unlegierten Stählen mit festgelegten Eigenschaften bei tiefen Temperaturen in zwei Prüfkategorien fest.
ANMERKUNG 1 Die Rohrgüten sind vorgesehen zur Unterstützung der grundlegenden Anforderungen der EU-Richtlinie 2014/68/EU bezüglich Druckgeräten mit festgelegten Eigenschaften bei tiefen Temperaturen (siehe Tabelle 5) und sie decken alle festgelegten Kategorien nach Artikel 13 der Richtlinie ab.
ANMERKUNG 2 Nach Veröffentlichung dieser Norm im EU-Amtsblatt (ABl.) ist die Annahme ihrer Konformität mit den grundlegenden Sicherheitsanforderungen (ESR) der Richtlinie 2014/68/EU auf die technischen Daten von Werkstoffen in dieser Norm beschränkt, und es darf nicht angenommen werden, dass damit die Eignung des Werkstoffs für ein bestimmtes Ausrüstungsteil festgestellt ist. Folglich müssen die in dieser Werkstoffnorm angegebenen technischen Parameter im Hinblick auf die konstruktiven Anforderungen dieses bestimmten Ausrüstungsteils ermittelt werden, um damit zu verifizieren, dass den ESR der Druckgeräterichtlinie entsprochen wird. Dies muss durch den Ausleger oder den Hersteller der Druckgeräte geschehen, der auch den nachfolgenden Herstellungsprozess berücksichtigen muss, der die Eigenschaften des Grundmaterials verändern kann.

Tubes soudés en acier pour service sous pression- Conditions techniques de livraison - Partie 6: Tubes soudés à l'arc sous flux en acier non allié avec caractéristiques spécifiées à basse température

Le présent document spécifie les conditions techniques de livraison de deux catégories d’essai de tubes soudés à l’arc immergé longitudinal (SAWL) ou hélicoïdal (SAWH), à section circulaire, avec caractéristiques spécifiées à basse température, fabriqués en aciers de qualité non alliés.
NOTE 1   Ces nuances sont destinées à remplir les exigences essentielles de la directive 2014/68/UE de l'UE sur les équipements sous pression avec caractéristiques spécifiées à basse température (voir le Tableau 5), concernant toutes les catégories pertinentes comme exposé dans l’Article 13 de cette directive.
NOTE 2   Dès lors que la présente Norme européenne est publiée dans le Journal Officiel de l’Union européenne (JOUE), la présomption de conformité avec les exigences essentielles de sécurité (ESR) de la Directive 2014/68/UE se limite aux données techniques des matériaux spécifiées dans la présente Norme européenne et ne suppose pas l’adéquation des matériaux avec un appareil en particulier. Par conséquent, l’évaluation des données techniques spécifiées dans la présente norme de matériaux par rapport aux exigences de conception d’un équipement spécifique, pour vérifier que les exigences essentielles de sécurité (ESRs) de la Directive sur les équipements sous pression soient satisfaites, doit être effectuée par le concepteur ou le fabricant de l’équipement sous pression, en tenant aussi compte de toutes les procédures ultérieures de fabrication qui peuvent affecter les propriétés du matériau de base.

Varjene jeklene cevi za tlačne posode - Tehnični dobavni pogoji - 6. del: Obločno pod praškom varjene nelegirane jeklene cevi s specificiranimi lastnostmi za delo pri nizkih temperaturah

Ta del standarda EN 10217 določa tehnične dobavne pogoje v dveh preskusnih kategorijah za obločno pod praškom varjene cevi s krožnim prerezom iz nelegiranega jekla in specificiranimi lastnostmi za delo pri nizkih temperaturah.

General Information

Status
Published
Publication Date
16-Apr-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
09-Apr-2012

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SLOVENSKI STANDARD
SIST EN 10217-6:2019
01-julij-2019
Nadomešča:
SIST EN 10217-6:2003
SIST EN 10217-6:2003/A1:2005

Varjene jeklene cevi za tlačne posode - Tehnični dobavni pogoji - 6. del: Obločno

pod praškom varjene nelegirane jeklene cevi s specificiranimi lastnostmi za delo
pri nizkih temperaturah

Welded steel tubes for pressure purposes - Technical delivery conditions - Part 6:

Submerged arc welded non-alloy steel tubes with specified low temperature properties

Geschweißte Stahlrohre für Druckbeanspruchungen - Technische Lieferbedingungen -
Teil 6: Unterpulvergeschweißte Rohre aus unlegierten Stählen mit festgelegten
Eigenschaften bei tiefen Temperaturen

Tubes soudés en acier pour service sous pression - Conditions techniques de livraison -

Partie 6 : Tubes soudés à l'arc immergé en acier non allié avec caractéristiques
spécifiées à basse température
Ta slovenski standard je istoveten z: EN 10217-6:2019
ICS:
23.020.32 Tlačne posode Pressure vessels
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
SIST EN 10217-6:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 10217-6:2019
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SIST EN 10217-6:2019
EN 10217-6
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2019
EUROPÄISCHE NORM
ICS 23.040.10; 77.140.75 Supersedes EN 10217-6:2002
English Version
Welded steel tubes for pressure purposes - Technical
delivery conditions - Part 6: Submerged arc welded non-
alloy steel tubes with specified low temperature
properties

Tubes soudés en acier pour service sous pression- Geschweißte Stahlrohre für Druckbeanspruchungen -

Conditions techniques de livraison - Partie 6: Tubes Technische Lieferbedingungen - Teil 6:

soudés à l'arc sous flux en aciers non allié avec Unterpulvergeschweißte Rohre aus unlegierten

caractéristiques spécifiées à basse température Stählen mit festgelegten Eigenschaften bei tiefen

Temperaturen
This European Standard was approved by CEN on 25 February 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10217-6:2019 E

worldwide for CEN national Members.
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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
Contents Page

European foreword ................................................................................................................................................................ 4

1 Scope ............................................................................................................................................................................. 5

2 Normative references ............................................................................................................................................. 5

3 Terms and definitions ............................................................................................................................................ 6

4 Symbols ........................................................................................................................................................................ 7

5 Classification and designation ............................................................................................................................. 7

5.1 Classification .............................................................................................................................................................. 7

5.2 Designation................................................................................................................................................................. 7

6 Information to be supplied by the purchaser ................................................................................................ 7

6.1 Mandatory information ......................................................................................................................................... 7

6.2 Options ......................................................................................................................................................................... 8

6.3 Example of an order ................................................................................................................................................ 8

7 Manufacturing process ........................................................................................................................................... 8

7.1 Steelmaking process ............................................................................................................................................... 8

7.2 Tube manufacture and delivery conditions ................................................................................................... 9

7.3 Non Destructive Testing Personnel Requirements .................................................................................. 10

8 Requirements ......................................................................................................................................................... 10

8.1 General ...................................................................................................................................................................... 10

8.2 Chemical composition ......................................................................................................................................... 11

8.2.1 Cast analysis ............................................................................................................................................................ 11

8.2.2 Product analysis .................................................................................................................................................... 11

8.3 Mechanical properties ......................................................................................................................................... 12

8.4 Appearance and internal soundness.............................................................................................................. 13

8.4.1 Weld seam ................................................................................................................................................................ 13

8.4.2 Tube surface ............................................................................................................................................................ 13

8.4.3 Internal soundness ............................................................................................................................................... 14

8.5 Straightness ............................................................................................................................................................. 14

8.6 Preparation of ends .............................................................................................................................................. 14

8.7 Dimensions, masses and tolerances ............................................................................................................... 15

8.7.1 Diameter and wall thickness ............................................................................................................................. 15

8.7.2 Mass ............................................................................................................................................................................ 15

8.7.3 Lengths ...................................................................................................................................................................... 15

8.7.4 Tolerances ............................................................................................................................................................... 15

9 Inspection ................................................................................................................................................................ 19

9.1 Type of inspection ................................................................................................................................................. 19

9.2 Inspection documents ......................................................................................................................................... 19

9.2.1 Types of inspection documents........................................................................................................................ 19

9.2.2 Content of inspection documents .................................................................................................................... 19

9.3 Summary of inspection and verification testing ........................................................................................ 20

10 Sampling ................................................................................................................................................................... 22

10.1 Frequency of tests ................................................................................................................................................. 22

10.1.1 Test unit .................................................................................................................................................................... 22

10.1.2 Number of sample tubes per test unit ........................................................................................................... 22

10.2 Preparation of samples and test pieces ........................................................................................................ 22

10.2.1 Selection and preparation of samples for product analysis .................................................................. 22

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SIST EN 10217-6:2019
EN 10217-6:2019 (E)

10.2.2 Location, orientation and preparation of samples and test pieces for mechanical tests ............ 22

11 Verification of test methods ............................................................................................................................... 24

11.1 Chemical analysis .................................................................................................................................................. 24

11.2 Tensile test on the tube body ............................................................................................................................ 24

11.3 Transverse tensile test on the weld ................................................................................................................ 24

11.4 Weld bend test ........................................................................................................................................................ 24

11.5 Impact test ................................................................................................................................................................ 24

11.6 Hydrostatic leak tightness test ......................................................................................................................... 25

11.7 Dimensional inspection ....................................................................................................................................... 25

11.8 Visual examination ............................................................................................................................................... 26

11.9 Non-Destructive Testing ..................................................................................................................................... 26

11.9.1 Non-Destructive Testing of the weld seam ................................................................................................... 26

11.9.2 Non-Destructive Testing for the detection of laminations for tubes of test category 2 ............... 26

11.9.3 Supply of strip end welds in SAWH tubes ..................................................................................................... 27

11.10 Retests, sorting and reprocessing ................................................................................................................... 27

12 Marking ..................................................................................................................................................................... 27

12.1 Marking to be applied .......................................................................................................................................... 27

12.2 Additional marking ............................................................................................................................................... 27

13 Protection ................................................................................................................................................................. 27

Annex A (normative) Qualification of welding procedure..................................................................................... 28

A.1 General ...................................................................................................................................................................... 28

A.2 Welding procedure specification ..................................................................................................................... 28

A.3 Preparation of sample tube and sample assessment ............................................................................... 30

A.4 Inspection and testing of the weld................................................................................................................... 30

A.5 Weld test pieces...................................................................................................................................................... 31

A.6 Test methods ........................................................................................................................................................... 31

A.7 Test acceptance levels.......................................................................................................................................... 32

A.8 Range of use of qualified procedures ............................................................................................................. 34

A.9 Qualification record .............................................................................................................................................. 34

Annex B (informative) Technical changes from the previous edition ............................................................... 35

B.1 Introduction ............................................................................................................................................................ 35

B.2 Technical changes ................................................................................................................................................. 35

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of 2014/68/EU .......................................................................................................................... 37

Bibliography .......................................................................................................................................................................... 38

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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
European foreword

This document (EN 10217-6:2019) has been prepared by Technical Committee CEN/TC 459 “ECISS -

European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.

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 October 2019, and conflicting national standards shall be withdrawn

at the latest by October 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 10217-6:2002.

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 2014/68/EU.

For relationship with EU Directive 2014/68/EU (formerly 97/23/EC), see informative Annex ZA, which is an

integral part of this document.

This European Standard consists of the following parts, under the general title Welded steel tubes for

pressure purposes – Technical delivery conditions:

Part 1: Electric welded and submerged arc welded non-alloy steel tubes with specified room temperature

properties

Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties

Part 3: Electric welded and submerged arc welded alloy fine grain steel tubes with specified room, elevated

and low temperature properties

Part 4: Electric welded non-alloy steel tubes with specified low temperature properties

Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties

Part 6: Submerged arc welded non-alloy steel tubes with specified low temperature properties

Part 7: Stainless steel tubes
Another European Standard series covering tubes for pressure purposes is:
EN 10216, Seamless steel tubes for pressure purposes.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Through its subcommittee SC 10 “Steel tubes, and iron and steel fittings” (secretariat: UNI)

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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
1 Scope

This document specifies the technical delivery conditions for two test categories of submerged arc

longitudinally (SAWL) or helically (SAWH) welded tubes of circular cross section, with specified low

temperature properties, made from non-alloy quality steel.

NOTE 1 These tube grades are intended to support the essential requirements of EU Directive 2014/68/EU in

respect of pressure equipment with specified low temperature properties (see Table 5), covered under all relevant

Categories as set out in Article 13 of that Directive.

NOTE 2 Once this standard is published in the Official Journal of the European Union (OJEU), presumption of

conformity to the Essential Safety Requirements (ESR) of Directive 2014/68/EU is limited to the technical data for the

materials in this standard and does not presume adequacy of the material for a specific item of pressure equipment.

Consequently, the assessment of the technical data stated in this material standard against the design requirements of

this specific item of equipment to verify that the ESRs of the Pressure Equipment Directive are satisfied, needs to be

done by the designer or manufacturer of the pressure equipment, taking also into account the subsequent

manufacturing processes which may affect properties of the base materials.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements of this document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

EN 10020, Definition and classification of grades of steel
EN 10021:2006, 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 10168:2004, Steel products — Inspection documents — List of information and description

EN 10204:2004, Metallic products — Types of inspection documents

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

CEN/TR 10261, Iron and steel — European standards for the determination of chemical composition

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

product standards

EN ISO 148-1:2016, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-

1:2016)

EN ISO 377:2017, Steel and steel products — Location and preparation of samples and test pieces for

mechanical testing (ISO 377:2017)

EN ISO 2566-1:1999, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels (ISO 2566-

1:1984)
EN ISO 4885, Ferrous materials — Heat treatments — Vocabulary (ISO 4885)

EN ISO 5173:2010, Destructive tests on welds in metallic materials — Bend tests (ISO 5173:2009)

EN ISO 6892-1:2016, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO

6892-1:2016)
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SIST EN 10217-6:2019
EN 10217-6:2019 (E)

EN ISO 10893-6:2011, Non-destructive testing of steel tubes — Part 6: Radiographic testing of the weld seam

of welded steel tubes for the detection of imperfections (ISO 10893-6:2011)

EN ISO 10893-7:2011, Non-destructive testing of steel tubes — Part 7: Digital radiographic testing of the weld

seam of welded steel tubes for the detection of imperfections (ISO 10893-7:2011)

EN ISO 10893-8:2011, Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of

seamless and welded steel tubes for the detection of laminar imperfections (ISO 10893-8:2011)

EN ISO 10893-9:2011, Non-destructive testing of steel tubes — Part 9: Automated ultrasonic testing for the

detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes (ISO 10893-

9:2011)

EN ISO 10893-11:2011, Non-destructive testing of steel tubes — Part 11: Automated ultrasonic testing of the

weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections (ISO 10893-

11:2011)

EN ISO 14174:2012, Welding consumables — Fluxes for submerged arc welding and electroslag welding —

Classification (ISO 14174:2012)

EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition (ISO 14284)

EN ISO 17639:2013, Destructive tests on welds in metallic materials — Macroscopic and microscopic

examination of welds (ISO 17639:2003)

ISO 11484:2009, Steel products — Employer’s qualification system for non-destructive testing (NDT) personnel

3 Terms and definitions

For the purpose of this document, the definitions given in EN 10020, EN 10021, EN 10266, EN ISO 4885 and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
test category
classification that indicates the extent and level of inspection and testing
3.2
employer
organisation for which a person works on a regular basis

Note 1 to entry: The employer may be either the tube manufacturer or a third party organization providing services,

such as Non-Destructive Testing (NDT).
3.3
SAW
submerged-arc welded tube

tubular product having one or two longitudinal seams, or one helical seam, produced using the submerged-

arc welding process
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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
3.4
SAWH
submerged-arc helical welded tube

tubular product having one helical weld seam produced using the submerged-arc welding process

3.5
SAWL
submerged-arc longitudinal welded tube

tubular product having one or two longitudinal weld seams produced using the submerged-arc welding

process
4 Symbols
For the purposes of this document, the symbols given in EN 10266 apply.
5 Classification and designation
5.1 Classification

In accordance with the classification system in EN 10020, the steel grades given in Tables 2 and 4 are

classified as non-alloy quality steels.
5.2 Designation
5.2.1 For the tubes covered by this document the steel designation consists of:
— the number of this European Standard, e.g. EN 10217-6;
plus either:
— the steel name in accordance with EN 10027-1;
or:
— the steel number allocated in accordance with EN 10027-2.
5.2.2 The steel name is designated by
— the capital letter P for pressure purposes;

— the indication of the specified minimum yield strength expressed in MPa, (see Table 4);

— the symbol of the delivery condition for the steel grade concerned (see Table 1);

— the symbol L for low temperature.
6 Information to be supplied by the purchaser
6.1 Mandatory information

The following information shall be supplied by the purchaser at the time of enquiry and order:

a) the quantity (mass, total length or number of tubes of set length);
b) the term ‘tube’ and tube type, SAWL or SAWH;
c) the dimensions (outside diameter D, wall thickness T) (see Table 6);
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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
d) the random length range (see 8.7.3);
e) for tubes with a D/T > 100, out of roundness limits (see 8.7.4.6);

f) the designation of the steel grade in accordance with this document (see 5.2);

g) the test category (see 9.3).
6.2 Options

A number of options are specified in document and these are listed below. In the event that the purchaser

does not indicate his wish to implement any of these options at the time of enquiry and order, the tubes shall

be supplied in accordance with the basic specification (see 6.1).
1) Tube manufacturing route (see 7.3.2);
2) Restriction on copper and tin content (see Table 2);
3) Product analysis (see 8.2.2);
4) Special end preparation (see 8.6);
5) Exact lengths (see 8.7.3);

6) Inspection document 3.2 in place of the standard 3.1 Inspection Certificate (see 9.2.1);

7) Verification of the tensile strength of the weld in the transverse direction for tubes with D ≤ 508 mm

(see Table 11).

8) Agreement of a different test pressure for hydrostatic leak-tightness test (see 11.6);

9) Wall thickness measurement away from the ends (see 11.7);
10) Non Destructive Testing method for the inspection of weld seam (see 11.9.1);
11) Additional marking (see 12.2);
12) Protection (see Clause 13).
6.3 Example of an order

500 m of SAWL tube with an outside diameter of 508 mm, a wall thickness of 4,5 mm in accordance with

EN 10217-6, made of steel grade P265NL, test category 1, in 9 m random lengths, with a 3.2 inspection

certificate in accordance with EN 10204:

500 m – SAWL - Tube - 508 × 4,5 - EN 10217–6 — P265NL - TC 1 - 9m - Option 6: 3.2

7 Manufacturing process
7.1 Steelmaking process

The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth

(Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or

ladle refining process.

Steels shall be fully killed and contain nitrogen binding elements, details of which shall be reported.

NOTE This excludes the use of rimming, balanced or semi-killed steel.
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SIST EN 10217-6:2019
EN 10217-6:2019 (E)
7.2 Tube manufacture and delivery conditions

7.2.1 The tubes shall be manufactured by a SAW process and in accordance with one of the routes as

specified in Table 1.

Unless Option 1 is specified the manufacturing route is at the discretion of the manufacturer.

Option 1: The manufacturing route from Table 1 is specified by the purchaser.

The submerged arc weld shall be made using at least one weld run on the inside and one weld run on the

outside of the tube.
The strip used for the manufacture of the SAWH tubes shall have a width of
...

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