EN 13480-5:2024

SLOVENSKI STANDARD
01-december-2024
Nadomešča:
SIST EN 13480-5:2018
SIST EN 13480-5:2018/A1:2019
SIST EN 13480-5:2018/A2:2021
Kovinski industrijski cevovodi - 5. del: Pregled in preskušanje
Metallic industrial piping - Part 5: Inspection and testing
Metallische industrielle Rohrleitungen - Teil 5: Prüfung
Tuyauteries industrielles métalliques - Partie 5: Inspection et contrôle
Ta slovenski standard je istoveten z: EN 13480-5:2024
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
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 13480-5
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 13480-5:2017
English Version
Metallic industrial piping - Part 5: Inspection and testing
Tuyauteries industrielles métalliques - Partie 5: Metallische industrielle Rohrleitungen - Teil 5: Prüfung
Inspection et contrôle
This European Standard was approved by CEN on 9 July 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-5:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 7
5 Determination of inspection and testing requirements . 7
5.1 General . 7
5.2 Classification of piping . 7
6 Design review . 7
7 In-process inspection and testing . 8
7.1 General . 8
7.2 Materials and formed pressure retaining parts. 8
7.2.1 General . 8
7.2.2 Verification of material . 8
7.2.3 Verification of formed pressure retaining parts . 8
7.2.4 Non-destructive testing of formed parts . 8
7.2.5 Destructive testing of formed parts. 12
7.3 Welding . 12
7.3.1 Review of welding documents . 12
7.3.2 Inspection before welding . 12
7.3.3 Testing and inspection during welding . 13
7.3.4 Inspection after welding . 13
7.3.5 Inspection of built up pipe ends. 13
7.4 Heat treatment . 13
8 Non-destructive testing of welds . 13
8.1 Application of NDT . 13
8.1.1 General . 13
8.1.2 Examination of weld quality by sample inspection . 14
8.1.3 Imperfections revealed by sample inspection. 14
8.2 Circumferential butt, branch, fillet and seal welds . 15
8.2.1 Extent of testing . 15
8.2.2 Dissimilar metal joints . 17
8.2.3 Transverse cracks . 17
8.3 Longitudinal welds . 17
8.4 Testing methods . 17
8.4.1 General . 17
8.4.2 Quality level . 17
8.4.3 Personnel qualification . 18
8.4.4 Selection of NDT methods and testing techniques . 18
8.4.5 Testing techniques and acceptance levels . 19
8.5 Reports . 19
8.6 Weld repairs. 19
9 Final assessment and documentation . 19
9.1 General . 19
9.2 Final inspection . 19
9.2.1 General . 19
9.2.2 Visual inspection before the proof test . 19
9.2.3 Visual inspection after the proof test . 20
9.2.4 Review of the manufacturing documents . 20
9.3 Proof test. 20
9.3.1 General . 20
9.3.2 Hydrostatic pressure test . 20
9.3.3 Pneumatic pressure test . 23
9.3.4 Other tests . 25
9.3.5 Documentation of the proof test . 25
9.4 Documentation . 25
9.4.1 Final documentation package . 25
9.4.2 Design and manufacturing documentation package . 27
9.4.3 Operating instructions . 27
9.4.4 Documentation for the purchaser . 27
10 Declaration. 27
Annex A (informative) Declaration of compliance with EN 13480 . 28
A.1 Declaration for design . 28
A.2 Declaration for fabrication, installation and testing . 29
A.3 Declaration for compliance for piping with EN 13480 . 30
Annex B (informative) Initial Leak Test . 31
B.1 Initial Service Leak Test . 31
B.1.1 General . 31
B.1.2 Examination Procedure for service fluid gas or vapor . 31
B.1.3 Examination Procedure for service fluid liquid . 31
B.2 Initial Leak Test . 31
Annex Y (informative) History of EN 13480-5 . 32
Y.1 Differences between EN 13480-5:2017 and EN 13480-5:2024 . 32
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 33
Bibliography . 34

European foreword
This document (EN 13480-5:2024) has been prepared by Technical Committee CEN/TC 267 “Industrial piping
and pipelines”, 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 December 2024, and conflicting national standards shall be withdrawn
at the latest by December 2024.
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 13480-5:2017.
This new edition incorporates the Amendments which have been approved previously by CEN members, and
the corrected pages up to Issue 2 without any further technical change. Annex Y provides details of significant
technical changes between this European Standard and the previous edition.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this document.
This European Standard EN 13480 for metallic industrial piping consists of eight interdependent and not
dissociable Parts which are:
 Part 1: General;
 Part 2: Materials;
 Part 3: Design and calculation;
 Part 4: Fabrication and installation;
 Part 5: Inspection and testing;
 Part 6: Additional requirements for buried piping;
 CEN/TR 13480-7, Guidance on the use of conformity assessment procedures;
 Part 8: Additional requirements for aluminium and aluminium alloy piping.
Although these Parts may be obtained separately, it should be recognized that the Parts are inter-dependant.
As such the manufacture of metallic industrial piping requires the application of all the relevant Parts in order
for the requirements of the Standard to be satisfactorily fulfilled.
This European Standard will be maintained by a Maintenance MHD working group whose scope of working is
limited to corrections and interpretations related to EN 13480. The contact to submit queries can be found at
https://unm.fr/en/maintenance-agencies/maintenance-agency-en-13480/. A form for submitting questions
can be downloaded from the link to the MHD website. After subject experts have agreed an answer, the answer
will be communicated to the questioner. Interpretation sheets will be posted on the website of the MHD.
Amendments to this new edition may be issued from time to time and then used immediately as alternatives
to rules contained herein. These amendments will be consolidated within EN 13480:2024 in accordance with
the maintenance system of EN 13480 series approved by CEN/BT Decision C172/2021.
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United Kingdom.
1 Scope
This document specifies the requirements for inspection and testing of industrial piping as specified in
EN 13480-1:2024 to be performed on individual spools or piping systems, including supports, designed in
accordance with EN 13480-3:2024 and EN 13480-6:2024 (if applicable), and fabricated and installed in
accordance with EN 13480-4:2024.
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 13480-1:2024, Metallic industrial piping — Part 1: General
EN 13480-2:2024, Metallic industrial piping — Part 2: Materials
EN 13480-3:2024, Metallic industrial piping — Part 3: Design and calculation
EN 13480-4:2024, Metallic industrial piping — Part 4: Fabrication and installation
EN 13480-6:2024, Metallic industrial piping — Part 6: Additional requirements for buried piping
CEN/TR 13480-7:2017, Metallic industrial piping — Part 7: Guidance on the use of conformity assessment
procedures
EN 14917:2021, Metal bellows expansion joints for pressure applications
EN ISO 5817:2023, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections (ISO 5817:2023)
EN ISO 9712:2022, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712:2021)
EN ISO 10893-5:2011, Non-destructive testing of steel tubes — Part 5: Magnetic particle inspection of seamless
and welded ferromagnetic steel tubes for the detection of surface imperfections (ISO 10893-5:2011)
EN ISO 17635:2016, Non-destructive testing of welds — General rules for metallic materials
(ISO 17635:2016)
EN ISO 17640:2018, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment (ISO 17640:2018)
ISO 3057:1998, Non-destructive testing — Metallographic replica techniques of surface examination

As impacted by EN ISO 10893-5:2011/A1:2020.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13480-1:2024 apply.
4 Symbols and abbreviations
For the purposes of this document, the symbols given in EN 13480-1:2024 apply together with the following
abbreviations.
NDT Non-destructive testing
MT Magnetic particle testing
PT Penetrant testing
RT Radiographic testing
UT Ultrasonic testing
VT Visual testing
PWHT Post-weld heat treatment
PED Pressure Equipment Directive.
5 Determination of inspection and testing requirements
5.1 General
The manufacturer shall be responsible for the fabrication and the installation, even if this work will be
sub-contracted to other fabricators and/or installers.
The fabricator and/or installer shall be responsible for carrying out the inspection and testing including
subcontracted NDT (if any) specified in this European Standard, for all piping.
NOTE For guidance on the use of conformity assessment procedures see CEN/TR 13480-7:2017.
5.2 Classification of piping
Industrial piping shall be classified in accordance with EN 13480-1:2024, Table 5.1-1.
NOTE Categories I to III are identical to categories I to III of the Pressure Equipment Directive.
6 Design review
Before fabrication/installation commences, a review of the piping design and its supports shall be performed.
Where design and fabrication are carried out by separate organisations, the piping designer shall prepare a
confirmation for the manufacturer that the design is in compliance with the requirements of this European
Standard.
A list of the relevant drawings shall be attached to the confirmation.
Where the design of parts has already been reviewed in accordance with this European Standard, and where
an appropriate confirmation is available, a further design review shall not be required.
NOTE For guidance on the use of conformity assessment procedures see CEN/TR 13480-7:2017.
7 In-process inspection and testing
7.1 General
Testing and inspection shall be carried out by personnel qualified for the method used. European Standards,
specifications or written procedures (if necessary) shall be available to all testing personnel and inspectors
prior to the testing/inspection.
Reports on NDT specified in 7.2.4 and Clause 8 and reports on destructive testing specified in 7.2.5 shall be
prepared to demonstrate that all required testing has been carried out and that the results are acceptable.
7.2 Materials and formed pressure retaining parts
7.2.1 General
The testing and inspection specified below shall be restricted to parts formed during the fabrication process,
especially induction bending. Formed bought out standardized parts and components shall not be a part of
this requirement.
Formed parts shall be subject to appropriate testing in accordance with the fabricators/installers test
programme.
7.2.2 Verification of material
A verification shall be performed that materials are in accordance with the specified material standard or
purchase order.
7.2.3 Verification of formed pressure retaining parts
It shall be verified that all formed pressure retaining parts comply with the specified shape and dimensional
requirements, and have received the specified finish or heat treatment.
7.2.4 Non-destructive testing of formed parts
7.2.4.1 General
All formed parts shall be subject to non-destructive testing. Depending on material, dimensions and type of
forming process testing can include:
a) visual testing;
b) wall thickness measurements;
c) dimensional checks (ovality, angle of bend etc.) and tolerances (see EN 13480-4:2024);
d) hardness tests;
e) testing for surface imperfections (magnetic particle or penetrant testing);
on formed parts of each component or batch of identical components.
Material, heat treatment conditions, heat treatment lot, degree of deformation shall be considered in the
definition of the batch.
Replicas of the surface structure in the tension zone can be required in case of lifetime monitoring for creep
range application.
Ultrasonic testing can be performed if specified. Specification shall include area, extent, method and
acceptance criteria.
NOTE A customary interpretation of a heat treatment lot is the entire content of a furnace of a single heat treatment.
7.2.4.2 Induction bending
Material surfaces shall be suitable for induction bending. EN ISO 10893-5:2011 specifies surface qualities and
acceptance levels. The acceptance levels shall be agreed, considering material, dimensions and service (creep,
fatigue).
Induction bends shall be tested according to Table 7.2.4.2-1.
Heat treatment shall be done if required by EN 13480-4:2024. Subsequent hardness testing shall be
performed on the straight length and within bending zone to verify the homogeneity of annealing.
If no heat treatment is required after forming, hardness testing is required in the bending zone only if specified
for service reasons.
Dimensional checks shall include ovality, angle of bend, wall thickness and tolerances
(see EN 13480-4:2024).
MT/PT testing shall be performed to verify that the outside surface in the bended zone is free of cracks.
If specified for the component or by Table 7.2.4.2-1, replicas of the surface structure in the tension zone shall
be taken on each component or batch of identical components. Replicas shall be made in accordance with
ISO 3057:1998.
The material grade, the heat treatment conditions of the material, the heat treatment lot after bending and the
forming conditions shall be considered in the definition of the batch.
Table 7.2.4.2-1 — NDT for induction bends
Material Group
Dimensional Hardness
(see EN 13480 VT MT/PT Replicas
check testing
-2:2024)
1.1, 1.2, 1.3, 8, 9 c c — b5e —
1.4, 3, 5.3, 5.4, 6 c c c cf —
2 c c c b5e —
4 c c c ce —
5.1, 5.2 c c b10e b10e —
10 c c — cf yes
NOTE
b5e – 5 % of batch on extrados
b10e – 10 % of batch on extrados
c – testing per component
ce – testing per component extrados
cf – component forming area
7.2.4.3 Cold formed pipes
Cold formed pipes shall be tested according to Table 7.2.4.3-1.
Heat treatment shall be done if required by EN 13480-4:2024. Subsequent hardness testing shall be
performed on the straight length and within bending zone to verify the homogeneity of annealing.
If no heat treatment is required after forming, hardness testing is required in the bending zone only if specified
by the purchaser for service reasons.
Dimensional checks shall be performed after tooling of the bending machine and start of production to the
same extent as specified for MT/PT (see Table 7.2.4.3-1) and shall include ovality, angle of bend and tolerances
(see EN 13480-4:2024).
Wall thickness measurement at the extrados is required for all cold formed pipes with r ≤ 1,3 d .
m o
MT/PT testing shall be performed to verify that the outside surface in the bended zone is free of cracks.
Table 7.2.4.3-1 — NDT after cold forming of pipes
Surface testing (MT/PT)
Material Hardness testing
%
VT
group (see
Category
EN 13480
% 1,3 d < r < 2,5
o m
r ≤ 1,3 d 2,5 d ≤ r r ≤ 1,3 d
-2:2024) m o o m m o
d
o
I
1.1, 1.2, 1.3,
II 100 0 0 0
8.1, 8.2, 9.1
III b5e
I 0 0 0
2.1, 2.2, 4.1,
c
4.2, 5.1, 5.2,
II 0 0
100 (only for material groups 2.1, 2.2, 4.1, 4,2)
7.1, 8.3,
b5e
9.2, 9.3
III b5e 0
1.4, 3.1, 3.2,
I b5f
3.3,
c
b5f b5f
5.3,
(only for material groups 3.1, 3.2, 3.3, 5.3, 5,4, 6.1, 6.2,
II
5.4, 6.1, 6.2, 100
6.3, 6.4)
6.3, 6.4,
b25f
7.2, 7.3, 10.1,
III b10f
10.2
NOTE
b5e – 5 % of batch on extrados
b5f – 5 % of batch on forming area
b10f – 10 % of batch on forming area
b25f – 25 % of batch on forming area
c - testing per component
7.2.5 Destructive testing of formed parts
Testing shall be performed to verify the heat treatment of the formed parts (induction bends with or
without subsequent heat treatment, cold formed parts with subsequent heat treatment, hot formed parts
with or without subsequent heat treatment) and shall include:
a) tensile test at room temperature;
b) impact test;
c) other tests specified in European Standards for base materials.
Testing shall be performed as specified in the European Standards for the base materials.
The tests shall be performed on test pieces from the end of the component itself, or from test pieces placed
together with the components in the heat treatment furnaces.
Production test coupons for destructive testing shall be representative for one heat treatment lot defined
by the same dimension, material heat and similar forming conditions.
Low alloyed steels (up to 5 % total alloying content) can be representatively tested by a single production
test coupon, representative for several furnace loads if:
1) comparable furnace parameters are applied and
2) the heat treatment parameters are recorded for each furnace load by a thermocouple attached to the
component.
7.3 Welding
7.3.1 Review of welding documents
Prior to carrying out any welding activity, the fabricator shall verify that the welding procedures and the
welding personnel are qualified for the relevant work. This shall be reviewed by the manufacturer.
7.3.2 Inspection before welding
Prior to carrying out any welding, each joint preparation shall be visually inspected. The inspection shall
verify compliance with the drawing and WPS, by ensuring the following:
a) the correct materials are used;
b) dimensions are within tolerance, including position, alignment, and orientation of branches, nozzles,
attachments and anchors, etc.;
c) cleanliness and freedom from imperfections which can give rise to defects in the completed joint;
d) nozzles, branches etc., properly fit the curvature of the pipe;
e) tack welds that are to be incorporated into the final weld are free from cracks or other defects.
7.3.3 Testing and inspection during welding
The following testing and inspection shall be carried out, where appropriate, at suitable stages during the
welding operation to verify that the specified WPS is being followed for:
a) correct preheat;
b) correct welding process;
c) correct welding consumables;
d) correct electrical characteristics;
e) correct interpass temperature and cleaning;
f) other requirements of the WPS;
g) all tack welds and temporary attachments are welded in accordance with an approved WPS.
7.3.4 Inspection after welding
The following inspection shall be carried out on completion of welding:
a) verification for compliance with drawings;
b) verification that welds are correctly identified and traceable to the welder/operator;
c) verification that temporary attachments have been properly removed.
7.3.5 Inspection of built up pipe ends
All built up pipe ends shall be subject to 100 % non-destructive testing of internal and surface
imperfections.
7.4 Heat treatment
For post-forming and post-weld heat treatment (PWHT), where applicable, it shall be verified by a review
of the heat treatment reports that the heat treatment carried out complies with the heat treatment
procedure.
If additional examinations (e.g. replica, hardness) after post-forming and post-weld heat treatment are
required, this testing shall be reported and the reports shall be reviewed.
8 Non-destructive testing of welds
8.1 Application of NDT
8.1.1 General
8.1.1.1 The following shall be applicable to all welded joints:
a) welded joints shall be visually examined before any other NDT is performed;
b) the area to be examined shall include the weld metal and the heat affected zones;
c) surface examination stipulated in Table 8.2-1 shall be performed on the outer surface;
d) where a welded joint is to be subsequently formed or heat treated, the required NDT shall be carried
out on the weld in the final condition. If a weld will not be accessible for examination after heat
treatment or forming, a suitable alternative shall be agreed;
e) NDT-methods used and acceptance criteria for all NDT shall be in accordance with 8.4.5;
f) weld imperfections, which have been assessed as weld defects, shall be repaired in accordance with
EN 13480-4 and inspected again after repair.
8.1.1.2 Arc strikes and contact points with fused material shall be ground smooth and subjected to
surface examination appropriate to the material used.
8.1.2 Examination of weld quality by sample inspection
Where the required extent of non-destructive testing is less than 100 %, the specified NDT techniques
shall be employed at the earliest stage practicable in the fabrication process to ensure that sound welds
are achieved. The timing shall be agreed. Sample welds to be examined shall be:
a) randomly selected;
b) representative of a batch of welds.
At least one complete sample weld shall be examined over the whole length.
Where the number of sample welds required is small, combinations of thicker sections and smaller
diameters or thinner sections and greater diameters shall be given preference. All welders and welding
operators shall be covered.
A batch of welds is a quantity of welds, welded by one welder or welding operator, in accordance with a
specific welding procedure specification.
8.1.3 Imperfections revealed by sample inspection
When sample inspection reveals imperfections in one weld which are not acceptable to this European
Standard, the following shall apply for each defective weld:
a) Two additional welds of the same batch shall be examined by the same method(s);
b) If these additional welds are acceptable, the initial weld shall be repaired or replaced and re-
examined by the original method(s);
c) If any one of these additional welds required by a) reveal an unacceptable imperfection, two further
additional welds of the same batch shall be examined by the same method(s).
d) If the two additional welds required by c) are acceptable, the initial weld and the weld(s) examined
under c) with unacceptable imperfections shall be repaired or replaced and re-examined by the
original method(s).
e) If any one of the two additional welds required by c) reveal an unacceptable imperfection, all welds
in that batch represented by the sample inspection shall be examined and, as necessary, repaired or
replaced and re-examined.
When defining the represented sample inspection one can distinguish between:
1) piping installation at construction sites; or
2) piping manufacturing (series or mass production) in workshops.
1) is normally used if 2) is not applicable. For this piping, a group of welds represented by the same
sample inspection can be specified per piping system or per line number.
2) is normally used for piping integrated in packaged units such as machinery. For this piping a group of
welds represented by the same sample inspection can be specified as per 1) above or per production lot
or any other sample inspection system as long as the minimum extent of NDT of this standard is kept.
8.2 Circumferential butt, branch, fillet and seal welds
8.2.1 Extent of testing
The type of NDT required and its extent shall be determined in accordance with Table 8.2-1, taking into
account the category the piping is classified to and also wall thicknesses and material grouping.
For piping where creep or fatigue is the controlling factor in design:
a) additional extent of NDT is required by Table 8.2-1, Note f, critical areas shall be included in the test;
b) the quality level given in Table 8.4.2-1 for these service conditions shall be met.
For piping of pipe category 0, piping operating at or below 0,5 bar and piping of category I the following
special rules apply:
1) for piping of pipe category 0 and piping operating at or below 0,5 bar, the amount of NDT shall
be suitable to ensure weld quality;
If volumetric testing is applied, a minimum amount of 2 % is recommended.
2) when agreed in the purchase order, for piping of category I made of material of material group
1.1, 1.2 and 8.1 an amount of 2% volumetric testing can be sufficient, if satisfactory experience
exists;
when pneumatic testing is used, the extent of testing according to Table 8.2-1, Note g (test P according
t
to 9.3.3 f)) and Table 9.3.3-1 applies.

Table 8.2-1 — Extent of testing for circumferential, branch, fillet and seal welds
l l
Material group Category All welds Circumferential welds Branch welds Socket/fillet welds Seal welds

a
Volumetric
b,k
Surface testing Surface testing Volumetric testing Surface testing Surface testing
b
testing
h c h
RT/UT e MT/PT e  RT/UT e MT/PT e MT/PT
VT Branch n Branch n n n
mm c
en MT/PT %
i
% diameter diameter
% mm % mm % mm % mm %
I
1.1, 5 0
All 0 0 0
g f,g
(10) (5)
1.2, II 100 All All All
f,g
(5)
8.1
III 10 10 > DN 100 > 15 10 10 10
≤ 30 5 10
I
1.3, 1.4, 1.5,
> 30 10 10
e e e
All All 0 All 10 All 5
2.1, 2.2,
≤ 30 5 10
4.1, 4.2, II
> 30 10 10
g
5.1, 5.2,
100 10 (25)
8.2, 8.3,
≤ 30 5
f,g
(25)
9.1, 9.2, 9.3,
III All > DN 100 > 15 10 All 25 All 25
10.1, 10.2 10
> 30 10
d f,g
(25 )
≤ 30 10 25
I
> 30 25 25
25 25 25 10
≤ 30 25 25
3.1, 3.2, 3.3, 5.3,
5.4,
II
> 30 25
d f,g
6.1, 6.2, All > DN 100 > 15 All All
100 (25 )
6.3, 6.4,
≤ 30 100
7.1, 7.2
f,g
(100)
III 100 100 100 100
> 30 100 25
d f,g
(100 )
a
Material group, see CEN ISO/TR 15608:2017.
b
For the selection of the appropriate NDT-method for volumetric testing, see 8.4.4.3.
c
See 8.4.4.2.
d
Additional testing for transverse defects from weld surface (see EN ISO 17640:2018).
e
Only if PWHT has been carried out.
f
Value in brackets applies to piping where creep or fatigue is the controlling factor in design.
g
Value in brackets applies to piping with pneumatic pressure test with 1,1 times the maximum allowable pressure.
h
en is the nominal thickness of the branch pipe at the weld (see W3, W3.1 and W6 in EN 13480-4:2024, Figure 9.14.4–1 and Figure 9.14.4–2).
i
For parts without DN designation d > 120 mm can be used instead of DN > 100.
i
k
Volumetric testing is required if both criteria (branch diameter and nominal thickness) are satisfied.
l
The number of welds shall be used up to DN ≤ 600, from DN > 600, the total length of the welds can be used.

8.2.2 Dissimilar metal joints
The test methods and extent of testing for welds between different materials (e.g. austenitic, nickel-based
alloys) shall be according to the material group with the higher extent of testing which is applicable to the
base materials.
8.2.3 Transverse cracks
For material groups 5.3, 5.4 and 6 with wall thicknesses above 30 mm testing for transverse defects from
weld surface (see EN ISO 17640:2018, testing level C) is required. For extent of testing see Table 8.2-1.
8.3 Longitudinal welds
Longitudinal welds, except those in components made to material specifications acceptable to this
European Standard (e.g. longitudinal welded steel tubes for pressure purposes acc. EN 10217:2019 series),
shall be subject to the level of NDT appropriate to the joint coefficient required (see Table 8.3-1).
Table 8.3-1 — Extent of NDT for longitudinal welds
a b
Joint coefficient VT MT or PT RT or UT

z
% % %
z ≤ 0,7 100 0 0
100 10 10
0,7 < z ≤ 0,85
100 100 100
0,85 < z ≤ 1,0
a
See 8.4.4.2
b
See 8.4.4.3
8.4 Testing methods
8.4.1 General
The testing methods specified in the following clauses shall be performed in accordance with written
procedures, and, where appropriate, with instructions.
8.4.2 Quality level
The quality level shall be in accordance with Table 8.4.2-1.
Table 8.4.2-1 — Quality level according to EN ISO 5817:2023 depending on service conditions
and test methods
Surface Imperfections and Imperfections in Internal Imperfections
joint geometry
Service conditions
Visual testing VT Surface testing Volumetric testing
Standard level C C C
Fatigue B B C
Creep B B B
8.4.3 Personnel qualification
Testing shall be carried out by an individual certified to at least EN ISO 9712:2022, level 1, under the
supervision of personnel certified to level 2 or level 3 who shall also be responsible for the evaluation of
the results.
Visual testing shall be performed and evaluated by an individual with sufficient knowledge and
experience with the relevant standards and specifications. Certifications in accordance with
EN ISO 9712:2022 are not required.
Ultrasonic testing shall be performed and evaluated by an individual certified to at least
EN ISO 9712:2022, level 2.
Prior to carrying out any testing activity, the fabricator shall verify that the personnel are qualified for
the relevant work. This shall be reviewed by the manufacturer.
NOTE Qualifications and certifications according to EN 473:2008 remain valid until their expiring date.
8.4.4 Selection of NDT methods and testing techniques
8.4.4.1 Visual inspection and testing
The term “visual inspection and testing” shall be understood to mean observation of the portion of
components, joints, and other piping elements and supports that are or can be exposed to view before,
during, or after manufacture, fabrication, assembly or installation.
NOTE This inspection can include verification of dimensions, weld edge, joint preparation, alignment, joining
(welding, bonding, brazing, or other methods of joining) supports, assembly and installation.
Visual testing of welds shall be in accordance to EN ISO 17635:2016, Table A.1 (VT).
8.4.4.2 Surface testing
Methods shall be MT or PT according to EN ISO 17635:2016, Table 2.
Testing techniques shall be in accordance to EN ISO 17635:2016, Table A.2 (PT) and Table A.3 (MT).
For ferritic steels MT is recommended instead of PT. For austenitic-ferritic steels PT is recommended.
8.4.4.3 Volumetric testing
Methods shall be selected according to EN ISO 17635:2016, Table 3.
Testing techniques shall be in accordance to EN ISO 17635:2016, Tables A.5 (RT-F), A.6 (RT-D), (RT-CR)
or (DDA), A.7 (UT), A.8 (TOFD) and A.9 (PAUT).
NDT techniques A.7, A.8 and A.9 can be used for other than ferritic materials providing they are proven
to satisfy the required quality level given in Table 8.4.2-1.
8.4.5 Testing techniques and acceptance levels
Depending on the quality levels of Table 8.4.2-1 testing techniques and levels and acceptance levels shall
be selected according to EN ISO 17635:2016, Annex A.
8.5 Reports
Reports of non-destructive testing shall be drawn up in accordance with the European Standard for the
testing method.
8.6 Weld repairs
Welding procedures shall be in accordance with EN 13480-4:2024.
Repaired welds shall be retested with the same NDT methods and testing techniques.
NOTE The evaluation of weld imperfections can require additional inspections durin
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