EN 10217-6:2019

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

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.

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
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

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)
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)
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
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);
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.
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 not less than 0,8 times or more
than 3,0 times the outside diameter of the tube.
The finished tubes shall not include the welds used to join together the strip or plate prior to forming, except
for SAWH tubes to test category 1, where this is permitted only when the welding procedure for the weld
joining the strip or plate has been qualified in accordance with Annex A and has also been subjected to the
same inspection and testing regime as the helical pipe welds and base material to test category 2 (see
11.9.3).
7.2.2 Submerged arc welding shall be carried out by qualified personnel in accordance with documented
procedures. For tubes to be used in pressure equipment under European legislation, manufacturers shall
employ an established procedure for the approval of welding operatives.
7.2.3 The welding procedure for SAW tubes shall be qualified in accordance with Annex A.
7.2.4 The delivery condition of tubes covered by this document are shown in Table 1.
Table 1 — Tube manufacturing process, route and delivery condition
Route Manufacturing process Manufacturing route
N° Acceptable
delivery
(according
Forming
Process Symbols Starting material
a
to condition
operation
Part 1)
4b   Hot rolled plate or strip NP
Submerged arc SAW
welded
- SAWL
— longitudinal
Normalized rolled plate
- SAWH
Cold formed and
c
5a
As welded
seam
or strip
welded
or
–– helical seam
Full body normalized
6a
plate or strip
7a Hot rolled plate or strip
Normalized
Normalized rolled plate
8a
formed and c
or strip
As welded
b
welded
Full body normalized
9a
plate or strip
a
As welded = no subsequent heat treatment; NP = tube full body normalized;
b
Only applicable to SAWL tubes;
c
Stress relieving treatment on the weld is permissible.
7.3 Non Destructive Testing Personnel Requirements
7.3.1 All NDT activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel,
authorized to carry out this work by the employer.
7.3.2 The qualification for levels 1 and 2 personnel shall be in accordance with ISO 11484 or, at least, an
equivalent to it.
7.3.3 It is recommended for the level 3 personnel to be suitably certified in accordance with EN ISO 9712
or, at least, an equivalent to it.
7.3.4 The operating authorization issued by the employer shall be in accordance with a written procedure.
7.3.5 All NDT operations shall be authorised by a level 3 NDT technician approved by the employer.
NOTE The definition of levels 1, 2 and 3 can be found in appropriate standards, e.g. EN ISO 9712 and ISO 11484.
8 Requirements
8.1 General
The tubes shall conform to the requirements of this document when supplied in a delivery condition in
accordance with Table 1 and inspected in accordance with the specified requirements in Table 11.
Tubes shall be suitable for hot and cold bending.
In addition, the general technical delivery requirements specified in EN 10021 shall apply.
8.2 Chemical composition
8.2.1 Cast analysis
The cast analysis reported by the steel producer shall apply and conform to the requirements of Table 2.
When welding tubes produced in accordance with this document, account should be taken of the fact that
the behaviour of the steel during and after welding is dependent not only on the steel analysis, but also on
the welding process, including heat input, any applied heat treatment and the conditions of preparing for
and carrying out the welding.
a
Table 2 — Chemical composition (cast analysis) in % by mass
Al
c
Steel grade C Si Mn P S Cr Mo Ni Nb Ti V
Cu
b
tot
Steel Steel max
max. max.  max. max. max. max. min. max. max. max. max.
name number .
0,40
P215N 0,02 0,01
1.0451 0,15 0,35 to 0,025 0,30 0,08 0,30 0,020 0,30 0,03 0,02
L 0 0
1,20
0,60
P265N 0,02 0,01
1.0453 0,20 0,40 to 0,025 0,30 0,08 0,30 0,020 0,30 0,03 0,02
L 0 0
1,40
a
Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser, except
for elements which may be added for finishing the cast. All appropriate measures shall be taken to prevent the addition of
undesirable elements from scrap or other materials used in the steel making process, which would have a negative impact on the
mechanical properties, ageing and the suitability of the material;
b
For Al/N ratios ≥ 2, if nitrogen is fixed by niobium, titanium or vanadium, details of which shall be reported, this
requirement does not apply except that when using titanium, the steel producer shall verify that (Al+Ti/2) ≥ 0,020 %;
c
Option 2: In order to facilitate subsequent forming operation, an agreed maximum copper content lower than indicated and an
agreed specified maximum tin content shall apply.
8.2.2 Product analysis
Unless Option 3 is specified, only the cast analysis shall be reported.
Option 3: A product analysis for the tubes shall be supplied.
Table 3 specifies the permissible deviations of the product analysis from the specified limits on cast analysis
given in Table 2.
Table 3 — Permissible deviations of the product analysis from specified limits on cast analysis given
in Table 2
Limiting value for the cast
Permissible deviation of the
analysis in accordance with
product analysis
Element
Table 2
% by mass
% by mass
C ≤ 0,20 + 0,02
Si ≤ 0,40 + 0,05
Mn ≤ 1,40 + 0,10
P ≤ 0,025 + 0,005
S ≤ 0,020 + 0,005
Al ≥ 0,020 - 0,005
Cr ≤ 0,30 + 0,05
Cu ≤ 0,30 + 0,05
Mo ≤ 0,08 + 0,02
Nb ≤ 0,010 + 0,005
Ni ≤ 0,30 + 0,05
Ti ≤ 0,03 + 0,01
V ≤ 0,02 + 0,01
8.3 Mechanical properties
The mechanical properties of the tubes, in a specified delivery condition from Table 1, shall conform to the
requirements of Table 4, Table 5 and 11.4, irrespective of whether the test results are actually verified or not
(see Table 11 for a summary of the inspection and verification testing required).
Table 4 —Tensile properties
Steel grade Tensile properties at room temperature
Upper yield Tensile a
Elongation
strength
strength or proof
A min.
Steel
strength
%
Steel name
Number
R or R min. R
eH p0,2 m
MPa MPa l t
b 1.0451 215 360 to 480 25 23
P215NL
c 1.0453 265 410 to 570 24 22
P265NL
a
l = longitudinal, t = transverse
b
Applies for specified wall thickness T ≤ 10 mm.
c
Applies for specified wall thickness T ≤ 25 mm.
Table 5 —Impact properties
Minimum average absorbed
a
energy
Steel grade
b
KV2 J
at a temperature of °C
- 40 - 20 + 20
Steel name Steel number
l t l t l t
c
1.0451 40 - 45 - 55 -
P215NL
d
1.0453 40 27 45 30 50 35
P265NL
a
l = longitudinal t = transverse
b
KV = impact values obtained using a 2 mm radius striker in
accordance with EN ISO 148-1.
c
Applies for specified wall thickness T ≤ 10 mm.
d
Applies for specified wall thickness T ≤ 25 mm.
8.4 Appearance and internal soundness
8.4.1 Weld seam
The weld area shall be free from cracks, lack of fusion and lack of penetration. Repairs to the weld seam shall
be permitted if done in accordance with an agreed documented procedure.
NOTE For strip and plate alignment (radial offset) and tolerances in the weld region, see 8.7.4.3 and 8.7.4.4.
8.4.2 Tube surface
8.4.2.1 The tubes shall be free from external and internal surface defects that can be detected by visual
examination of the surfaces that are accessible without the use of special equipment.
8.4.2.2 The internal and external surface finish of the tubes shall be typical of the manufacturing process
and, where applicable, the heat treatment employed. Normally the finish and surface condition shall be such
that any surface imperfections requiring dressing can be identified.
8.4.2.3 It shall be permissible to dress only by grinding or machining surface imperfections provided
that after doing so, the wall thickness in the dressed area is not less than the specified minimum wall
thickness. All dressed areas shall blend smoothly into the contour of the tube
8.4.2.4 Any surface imperfection, which is demonstrated to be deeper than 5 % of the wall thickness T or
3 mm, whichever is the smaller, shall be dressed.
8.4.2.5 Surface imperfections which extend below the specified minimum wall thickness shall be
considered defects and tubes containing these shall be deemed not to conform with this document and shall
be rejected.
8.4.3 Internal soundness
8.4.3.1 Leak tightness
The tubes shall be assessed for leak tightness by a hydrostatic test (see 11.6).
8.4.3.2 Non-Destructive Testing
The full length of the weld seam of SAWL and SAWH tubes to test categories 1 and 2 shall be subjected to
Non-Destructive Testing for the detection of imperfections in accordance with 11.9.1.
Additionally the edges of the plate or strip, the body and the ends of tubes supplied to test category 2 shall be
subjected to Non-Destructive Testing for the detection of laminar imperfections in accordance with 11.9.2.
8.5 Straightness
The deviation from straightness of any tube length L shall not exceed 0,001 5 L. Deviations from straightness
over any one metre length shall not exceed 3 mm.
8.6 Preparation of ends
Unless Option 4 is specified, tubes shall be delivered with square cut ends free from excessive burrs.
Option 4: The tubes shall be delivered with bevelled ends (see Figure 1). The bevel shall have an angle α of 30°
+°5
with a root face C of 1,6 mm ± 0,8 mm. Bevelling is applicable for specified wall thicknesses ≥ 3,2 mm, except
0°
that for wall thickness T ≥ than 20 mm, an agreed alternative bevel may be specified.

Key
D outside diameter
α bevel angle
C root face of bevelled end
Figure 1 — Tube end bevel
8.7 Dimensions, masses and tolerances
8.7.1 Diameter and wall thickness
Tubes shall be delivered by outside diameter D and wall thickness T.
Preferred outside diameters D and wall thicknesses T have been selected from EN 10220 and are given in
Table 6.
NOTE Dimensions other than those in Table 6 may be agreed.
8.7.2 Mass
For the mass per unit length the provision of EN 10220 applies.
8.7.3 Lengths
Unless option 5 is specified, the tubes shall be delivered in random lengths. The delivery range shall be
agreed at the time of enquiry and order.
Option 5: The tubes shall be delivered in exact lengths, the length to be specified at the time of enquiry and
order. For tolerances see 8.7.4.5.
8.7.4 Tolerances
8.7.4.1 Tolerances on diameter and thickness
The diameter and the wall thickness of the tubes shall be within the tolerance limits given in Table 7.
Table 6 — Preferred dimensions
Dimensions in millimetres
Outside diameter D Wall thickness T
a
Series
1 2 3 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
406,4
a
series 1 = diameters for which all the accessories needed for the construction of piping systems are
standardised;
series 2 = diameters for which not all the accessories are standardised;
series 3 = diameters for special applications for which very few standardised accessories exist.

Table 7 — Tolerances on outside diameter and on wall thickness
Dimensions in millimetres
a
Tolerance on wall thickness
Outside
Tolerance on
Diameter
outside diameter
D T ≤ 5 5 < T ≤ 40
±0,75 % or ± 6 ±10 % or ± 0,3 ±8 % or ± 2
≥ 406,4
whichever is the lower whichever is the greater whichever is the lower
a
The plus tolerance excludes the weld area (see 8.7.4.2).
8.7.4.2 Height of the weld seam
The height of the external and internal weld seam shall be within the limits indicated in Table 8.
Table 8 — Maximum height of the weld seam
Dimensions in millimetres
Maximum height of the
Wall thickness
outside and inside weld
T
seam
T ≤ 12,5 3
T > 12,5 4
8.7.4.3 Radial offset of plate or strip edges at the weld
The radial offset of the abutting plate or strip edges, see Figure 2, shall be within the limits indicated in
Table 9.
Key
1, 4 outside/inside diameter radial offset
2, 3 outside/inside height of the weld seam
Figure 2 — Radial offset of the abutting plate or strip edges
Table 9 — Maximum radial offset of the abutting plate or strip edges
Dimension in millimetres
Wall thickness
Maximum radial offset
T
T ≤ 12,5 1,6
T > 12,5 0,125 T with a max. of 3,2
8.7.4.4 Misalignment of the weld seam
Misalignment of the weld seams, see Figure 3, shall be acceptable provided complete penetration and
complete fusion are achieved.
Key
1 misalignment
Figure 3 — Example showing the possible misalignment of the weld seams
8.7.4.5 Tolerances on exact length
The tolerances for exact lengths shall be as given in Table 10.
Table 10 — Tolerances on exact length
Dimensions in millimetres
Length range
Tolerance
L
+ 25
L ≤ 6 000
+ 50
6 000 < L ≤ 12 000
+ By agreement
L > 12 000
8.7.4.6 Out of roundness
The out-of-roundne
...