Tanks for the transport of dangerous goods - Metallic tanks with a working pressure not exceeding 0,5 bar - Design and construction

This European Standard specifies requirements for the design and construction of metallic tanks with a maximum working pressure not exceeding 50 kPa gauge used for the transport of dangerous goods by road and rail for which Tank Code with letter “G” is given in chapter 3.2 of ADR [2]. It also includes requirements for a system of identification of materials used in the construction of these tanks.
This European Standard specifies requirements for openings, closures and structural equipment.
NOTE 1   This document does not specify requirements for service equipment.
This European Standard is applicable to aircraft refuellers that are used on public roads. It is also applicable to inter-modal tanks (e.g. tank containers and tank swap bodies) for the transport of dangerous goods by road and rail.
NOTE 2   This document is not applicable to fixed rail tank wagons.

Tanks für die Beförderung gefährlicher Güter - Metalltanks mit einem Betriebsdruck von höchstens 0,5 bar - Auslegung und Bau

Diese Europäische Norm legt Anforderungen an Auslegung und Bau von Metalltanks mit einem Betriebsdruck von höchstens 50 kPa fest, die für die Beförderung gefährlicher Güter auf der Straße und der Schiene ver-wendet werden und für die im Kapitel 3.2 des ADR [2] der Tank-Code mit dem Buchstaben „G“ angegeben wird. Sie enthält darüber hinaus Anforderungen an das Kennzeichnungssystem für die beim Bau dieser Tanks verwendeten Werkstoffe.
Diese Europäische Norm legt Anforderungen an Öffnungen, Verschlüsse und die bauliche Ausrüstung fest.
ANMERKUNG 1   Dieses Dokument legt keine Anforderungen an die Bedienungsausrüstung fest.
Diese Europäische Norm gilt für Flugfeldtankfahrzeuge, wenn diese auf öffentlichen Straßen eingesetzt werden. Sie gilt auch für intermodale Tanks (z. B. Tankcontainer und Tankwechselbehälter) für die Beförderung gefährlicher Güter auf der Straße und der Schiene.
ANMERKUNG 2   Dieses Dokument gilt nicht für fest verbundene Eisenbahnkesselwagen.

Citernes destinées au transport de matières dangereuses - Citernes métalliques ayant une pression de service inférieure ou égale à 0,5 bar - Conception et construction

La présente Norme européenne spécifie les exigences de conception et de construction des citernes métalliques ayant une pression maximale de service manométrique (effective) inférieure ou égale à 50 kPa, utilisées pour le transport de matières dangereuses par route et par chemin de fer, pour lesquelles le code-citerne avec la lettre « G » est donné au chapitre 3.2 de l’ADR [2]. Elle comprend également des exigences relatives à un système d’identification des matériaux utilisés dans la construction de ces citernes.
La présente Norme européenne spécifie les exigences relatives aux ouvertures, fermetures et équipements de structure.
NOTE 1   Le présent document ne spécifie pas d’exigences concernant les équipements de service.
La présente Norme européenne est applicable aux avitailleurs d’aéronefs utilisés sur des voies publiques. Elle s’applique également aux citernes de transport combiné (par exemple conteneurs-citernes et caisses mobiles citernes) destinées au transport de matières dangereuses par route et par chemin de fer.
NOTE 2   Le présent document ne s’applique pas aux wagons-citernes fixes.

Cisterne za prevoz nevarnega blaga - Kovinski rezervoarji z delovnim tlakom pod 0,5 bar - Konstruiranje in izdelava

General Information

Status
Withdrawn
Public Enquiry End Date
31-Jul-2013
Publication Date
08-Jun-2015
Withdrawal Date
09-Aug-2020
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
30-Jul-2020
Due Date
22-Aug-2020
Completion Date
10-Aug-2020

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SLOVENSKI STANDARD
SIST EN 13094:2015
01-julij-2015
1DGRPHãþD
SIST EN 13094:2008
SIST EN 13094:2008/AC:2010
Cisterne za prevoz nevarnega blaga - Kovinski rezervoarji z delovnim tlakom pod
0,5 bar - Konstruiranje in izdelava
Tanks for the transport of dangerous goods - Metallic tanks with a working pressure not
exceeding 0,5 bar - Design and construction
Tanks für die Beförderung gefährlicher Güter - Metalltanks mit einem Betriebsdruck von
höchstens 0,5 bar - Auslegung und Bau
Citernes destinées au transport de matières dangereuses - Citernes métalliques ayant
une pression de service inférieure ou égale à 0,5 bar - Conception et construction
Ta slovenski standard je istoveten z: EN 13094:2015
ICS:
13.300 Varstvo pred nevarnimi Protection against dangerous
izdelki goods
23.020.20 Posode in vsebniki, montirani Vessels and containers
na vozila mounted on vehicles
SIST EN 13094:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13094:2015

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SIST EN 13094:2015

EUROPEAN STANDARD
EN 13094

NORME EUROPÉENNE

EUROPÄISCHE NORM
May 2015
ICS 13.300; 23.020.20 Supersedes EN 13094:2008
English Version
Tanks for the transport of dangerous goods - Metallic tanks with
a working pressure not exceeding 0,5 bar - Design and
construction
Citernes destinées au transport de matières dangereuses - Tanks für die Beförderung gefährlicher Güter - Metalltanks
Citernes métalliques ayant une pression de service mit einem Betriebsdruck von höchstens 0,5 bar - Auslegung
inférieure ou égale à 0,5 bar - Conception et construction und Bau
This European Standard was approved by CEN on 17 January 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13094:2015 E
worldwide for CEN national Members.

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SIST EN 13094:2015
EN 13094:2015 (E)
Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms, definitions and symbols .6
3.1 Terms and definitions .6
3.2 Symbols .8
4 Breather device and safety device .9
5 Materials . 10
5.1 General . 10
5.2 Material properties . 10
5.3 Compatibility of shell materials with substances carried . 11
6 Design . 12
6.1 General . 12
6.2 Design verification . 12
6.3 Requirements for shells of non-circular cross-section . 12
6.4 Dynamic conditions . 12
6.5 Pressure conditions . 13
6.6 Partial vacuum conditions . 13
6.7 Design temperature . 13
6.8 Design stress . 13
6.9 Shell thickness . 14
6.10 Shell openings, neckrings and closures . 18
6.11 Shell partitions, surge plates and baffles . 18
6.12 Attachments to the shell . 19
6.13 Shell supporting structure . 20
6.14 Protection of service equipment mounted on the tank top . 20
7 Manufacture . 27
7.1 General . 27
7.2 Cutting and edge preparation . 28
7.3 Forming . 28
7.4 Welding . 29
7.5 Manufacturing tolerances . 30
7.6 Rectification of defects . 31
Annex A (normative) Methods of design verification . 32
A.1 General . 32
A.2 Dynamic testing . 32
A.3 Finite element stress analysis . 33
A.4 Reference design . 35
A.5 Calculation method – worksheet . 35
Annex B (normative) Method of measurement of specific resilience . 56
B.1 Principle . 56
B.2 Apparatus . 56
2

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SIST EN 13094:2015
EN 13094:2015 (E)
B.3 Samples of materials to be tested . 60
B.4 Procedure . 62
B.5 Results . 63
B.6 Global resilience (see 6.9.2.2 i)) . 64
B.7 Comparative methods to calculate the energy absorbed during an overturning or an

impact. (see 6.9.2.2 j)) . 65
Annex C (normative) Design of neckrings, flanges and closures . 66
Annex D (informative) Examples of welding details . 67
D.1 General . 67
D.2 Tank construction . 67
D.3 Attachment of reinforcements . 78
D.4 Attachment of branches . 80
D.5 Attachment of flanges, collars and reinforcing pads to the shell . 82
D.6 Attachment of flanges onto branches . 83
D.7 Attachment of heating channels to shells . 84
Bibliography . 86

3

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SIST EN 13094:2015
EN 13094:2015 (E)
Foreword
This document (EN 13094:2015) has been prepared by Technical Committee CEN/TC 296 “Tanks for
transport of dangerous goods”, 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 November 2015 and conflicting national standards shall be withdrawn
at the latest by November 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13094:2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
This European Standard has been submitted for reference into the RID and/or in the technical annexes of the
ADR.
Compared with EN 13094:2008, the following changes are the principal modifications which have been made:
a) a new form of protection was added to 6.9.2.2;
b) subclause 6.10 was revised;
c) for the protection of service equipment mounted on top of the tank, the addition of an alternative steel
and, where longitudinal and transverse members are used, additional requirements for drainage were
added;
d) references were updated, in particular related to welding and NDT standards;
e) literal mistakes were corrected.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
4

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SIST EN 13094:2015
EN 13094:2015 (E)
1 Scope
This European Standard specifies requirements for the design and construction of metallic tanks with a
maximum working pressure not exceeding 50 kPa gauge used for the transport of dangerous goods by road
and rail for which Tank Code with letter “G” is given in Chapter 3.2 of ADR [2]. It also includes requirements
for a system of identification of materials used in the construction of these tanks.
This European Standard specifies requirements for openings, closures and structural equipment.
NOTE 1 This document does not specify requirements for service equipment.
This European Standard is applicable to aircraft refuellers that are used on public roads. It is also applicable to
inter-modal tanks (e.g. tank containers and tank swap bodies) for the transport of dangerous goods by road
and rail.
NOTE 2 This document is not applicable to fixed rail tank wagons.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 10204, Metallic products — Types of inspection documents
EN 12972:2007, Tanks for transport of dangerous goods — Testing, inspection and marking of metallic tanks
EN 13317, Tanks for transport of dangerous goods — Service equipment for tanks — Manhole cover
assembly
EN 14025, Tanks for the transport of dangerous goods — Metallic pressure tanks — Design and construction
EN 14595, Tanks for transport of dangerous goods — Service equipment for tanks — Pressure and Vacuum
Breather Vent
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)
EN ISO 3834-1, Quality requirements for fusion welding of metallic materials — Part 1: Criteria for the
selection of the appropriate level of quality requirements (ISO 3834-1)
EN ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive quality
requirements (ISO 3834-2)
EN ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections (ISO 5817)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1)
EN ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
(ISO 7500-1)
EN ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1)
5

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SIST EN 13094:2015
EN 13094:2015 (E)
EN ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
(ISO 9606-2)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
EN ISO 10042, Welding — Arc-welded joints in aluminium and its alloys — Quality levels for imperfections
(ISO 10042)
EN ISO 14732, Welding personnel — Qualification testing of welding operators and weld setters for
mechanized and automatic welding of metallic materials (ISO 14732)
EN ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
(ISO 15607)
EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding (ISO 15609-1)
EN ISO 15609-2, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 2: Gas welding (ISO 15609-2)
EN ISO 15613, Specification and qualification of welding procedures for metallic materials — Qualification
based on pre-production welding test (ISO 15613)
EN ISO 15614 (all parts), Specification and qualification of welding procedures for metallic materials —
Welding procedure test (ISO 15614, all parts)
EN ISO 17635, Non-destructive testing of welds — General rules for metallic materials (ISO 17635)
EN ISO 17636-1, Non-destructive testing of welds —- Radiographic testing — Part 1: X- and gamma-ray
techniques with film (ISO 17636-1)
EN ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints (ISO 17637)
EN ISO 17640, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment (ISO 17640)
ISO 1496-3, Series 1 freight containers — Specification and testing — Part 3: Tank containers for liquids,
gases and pressurized dry bulk
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
baffle
structure, other than a surge plate, intended to inhibit the movement of the shell contents
3.1.2
capacity
total inner volume of shell or shell compartment
Note 1 to entry: When it is impossible to fill completely the shell or shell compartment because of its shape or
construction, this reduced capacity should be used for the determination of the degree of filling and for the marking of the
tank.
6

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SIST EN 13094:2015
EN 13094:2015 (E)
3.1.3
competent authority
authority or authorities or any other body or bodies designated as such in each country and in each specific
case in accordance with domestic law
Note 1 to entry: Attention is drawn to ADR [2] and to the OTIF regulations (commonly referred to as RID) [3] in respect
of Competent Authorities.
3.1.4
maximum working pressure
highest of the four pressures P , P , P and P
d r v ts
3.1.5
partition
hermetically sealed dividing wall between adjacent compartments in compartmented tanks
3.1.6
section modulus
second moment of area of a structure (and, where appropriate, its associated shell) about its neutral axis
divided by the maximum distance from the neutral axis to the extreme fibre of the section used in the
calculation
3.1.7
shell
sheathing containing the substance carried (including the openings and their closures)
3.1.8
specific resilience
integral of the applied force and the measured deflection of a test piece up to the point at which the test bar
punctures the test piece, as indicated by the point of maximum force
3.1.9
global resilience
ability of a shell with multiple divisions or surge plates to withstand a sideways impact with a beam
3.1.10
mild steel
2 2
steel with a guaranteed minimum tensile strength of 360 N/mm to 490 N/mm and a guaranteed minimum
elongation at fracture conforming to the requirement for steel specified in 5.2.2.3.1
3.1.11
reference steel
2
and an elongation after fracture of 27 %
steel with a tensile strength of 370 N/mm
3.1.12
surge plate
non-hermetically sealed wall in tanks or compartments of shells intended to reduce the effect of surge,
mounted at right angles to the direction of travel, having an area of at least 70 % of the cross-sectional area of
the shells where the surge plate is located
3.1.13
test pressure
highest effective pressure which arises in the tank during the pressure test
3.1.14
maximum design mass
sum of the tare of the tank and the maximum permissible load for which the tank is designed
7

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SIST EN 13094:2015
EN 13094:2015 (E)
3.2 Symbols
For the purposes of this document, the following symbols apply.
A
percentage (%) elongation after fracture
A minimum percentage (%) elongation after fracture of the metal used (see 6.9.1)
1
B
pitch circle diameter or, if elliptical, average of major and minor diameters, in millimetres
(mm)
c
distance from the start of a knuckle bend to the edge of a shell, in millimetres (mm)
NOTE 1 This is used for the attachment of a dished end to a shell.
e shell thickness, in millimetres (mm)
e
thickness of a flat closure, in millimetres (mm)
c
e thickness of a domed closure, in millimetres (mm)
d

e thickness of a tank end or partition, in millimetres (mm)
f
e thickness of a reinforcing section, in millimetres (mm)
rs
e thickness of an opening flange, in millimetres (mm)
r
e thickness of a domed closure flange, in millimetres (mm)
rd
e adopted thickness of a shell, in millimetres (mm)
v
e minimum thickness of a shell according to 6.9.1, in millimetres (mm)
v, min
e minimum thickness of shell in reference steel, in millimetres (mm)
0
e
thickness of the thickest part of a shell, in millimetres (mm)
1
e thickness of the thinner part of the metal used, in millimetres (mm)
2
2
g
acceleration due to gravity, in metres per second squared (m/s )
2
NOTE 2 The value of g is 9,81 m/s .
L overlap of a lapped joint, in millimetres (mm)
L
length of reinforcing piece, in millimetres (mm)
c
L length of reinforcing ring, in millimetres (mm)
r
L
initial gauge length of the test piece used in the tensile test, in millimetres (mm)
0
l length of transition between plates of different thickness, in millimetres (mm)
l
length of overlap of swaged edge, in millimetres (mm)
1
l length of weld at base of swaged joint, in millimetres (mm)
2
8

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SIST EN 13094:2015
EN 13094:2015 (E)
N safety factor
P
highest effective pressure allowed in a shell during discharge (“maximum discharge
d
pressure allowed”), in MegaPascals (MPa)
P highest effective pressure allowed in a shell during filling (“maximum filling pressure
r
allowed”), in MegaPascals (MPa)
P opening pressure of the breather device, in MegaPascals (MPa)
ts
P effective pressure to which a shell is subjected by the substance carried (including such
v
extraneous gases as it might contain) at the design temperature, in MegaPascals (MPa)
P design pressure of tank, in MegaPascals (MPa)
x
R
internal radius of a domed closure, in millimetres (mm)
2
R determined tensile strength, in Newtons per square millimetre (N/mm )
d
R
apparent yield strength for steels having a clearly defined yield point or guaranteed 0,2 %
e
proof strength for steels with no clearly defined yield point (1 % proof strength for
2
austenitic steels) Newtons per square millimetre (N/mm )
R apparent yield strength for steels having a clearly defined yield point or guaranteed 0,2 %
et
proof strength for steels with no clearly defined yield point (1 % proof strength for
2
austenitic steels) at minimum design temperature Newtons per square millimetre (N/mm )
2
R
tensile strength, in Newtons per square millimetre (N/mm )
m
R tensile strength at minimum design temperature, in Newtons per square millimetre
mt
2
(N/mm )
2
R minimum tensile strength of the metal used, in Newtons per square millimetre (N/mm )
m1
2
S total tensile area, in square millimetres (mm )
B
S initial cross-sectional area of a test piece used in the tensile test, in square millimetres
0
2
(mm )
w effective depth of fillet weld (i.e. distance from the surface of the weld to the minimum
penetration point of the molten metal into the base material)
3
Z minimum section modulus in reference steel, in cubic centimetres (cm )
0
3
Z minimum section modulus in the metal used, in cubic centimetres (cm )
1
σ design stress for cover material, according to 6.8, in Newtons per square millimetre
c
2
(N/mm )
σ design stress for flange material, according to 6.8, in Newtons per square millimetre
r
2
(N/mm )
4 Breather device and safety device
Tanks shall be equipped with a breather device fitted with a safety device to prevent the contents from spilling
out if the tank overturns in accordance with EN 14595. For compartmented tanks, each compartment shall be
equipped so.
9

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SIST EN 13094:2015
EN 13094:2015 (E)
5 Materials
5.1 General
5.1.1 The designer shall select the materials to be used in the construction of the tank using ferritic steel,
austenitic steel, austenitic-ferritic stainless steel or aluminium alloy material standards published by a national
or international standards body or otherwise approved by the competent authority. The material shall in any
case meet the requirements specified in 5.2.
5.1.2 Materials used in the construction of shells shall be suitable for shaping. Materials shall be deemed
unsuitable if, even though they meet the material requirements of this European Standard, the degree of
shaping required by a particular shell design generates cracking or other signs of distress in the shell material.
5.1.3 Materials shall be used that are known to be resistant to brittle fracture and to stress corrosion
cracking.
5.1.4 When tested in accordance with the appropriate clauses of EN ISO 15614-1, the properties of
materials used in the fabrication of welded shells shall not be less than the minimum values specified for the
material selected in accordance with 5.1.1 throughout the welded area after welding without post-weld heat
treatment.
5.2 Material properties
5.2.1 Impact strength
Ferritic steel materials shall be tested in accordance with EN ISO 148-1 using a V-shaped notch, and shall
2
have an impact strength of not less than 34 J/cm at –20 °C (or at the minimum design temperature where this
is lower). Impact tests shall be carried out on sheets of materials, or on their weld seams, where the sheet
thickness is more than 5 mm.
5.2.2 Yield strength, tensile strength and elongation after fracture
5.2.2.1 General
5.2.2.1.1 The values of A, R and R to be used shall be the minimum values specified for the material
e m
selected in accordance with the relevant standard for the material with the exception of 5.2.2.1.2 and
5.2.2.1.3.
5.2.2.1.2 When austenitic steels are used, the value of R used in the calculation may exceed the minimum
e
value in accordance with the relevant standard for the material specified for the material selected provided
that:
— the higher values are attested in a certificate 3.1 issued in accordance with EN 10204;
— the value of R used in the calculation does not exceed 1,15 multiplied by the value of R as specified for
e e
the material selected in accordance with the relevant standard for the material.
2
5.2.2.1.3 When fine-grained steels are used, the value of R shall not exceed 460 N/mm and the value of
e
2
R shall not exceed 725 N/mm in accordance with the specifications of the relevant standard for the material.
m
5.2.2.2 Yield strength and tensile strength
Steels with a ratio of R /R exceeding 0,85 shall not be used in the construction of welded tanks. The values
e m
specified in certificate 3.1 issued in accordance with EN 10204 shall be used to determine the R /R ratio.
e m
10

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SIST EN 13094:2015
EN 13094:2015 (E)
5.2.2.3 Elongation after fracture
5.2.2.3.1 The material shall be tested in accordance with EN ISO 6892-1. The percentage elongation after
fracture, A, shall be not less than:
— 16 % for fine grained steels;
— 20 % for other steels;
— 12 % for aluminium alloys.
5.2.2.3.2 Additionally, for steel, the percentage elongation after fracture, A, shall be not less than the value
calculated using Formula (1):
2
10 000 N/mm
A= (1)
R
d
NOTE For A, Rd and Rm1 only the numerical value with the unit according to 3.2 is given.
5.2.2.3.3 For sheet metal, when measuring the percentage elongation after fracture in accordance with
EN ISO 6892-1, the axis of the tensile test piece shall be at right angles to the direction of rolling; where the
material standard gives lower values in the direction of rolling, thes
...

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