LPG equipment and accessories - Welded steel pressure vessels for LPG road tankers - Design and manufacture

This European Standard specifies minimum requirements for materials, design, construction and workmanship procedures, and tests for welded LPG road tanker pressure vessels and their welded attachments manufactured from carbon, carbon/manganese and micro alloy steels.
There is no upper size limit as this is determined by the gross vehicle weight limitation.
This European Standard does not cover pressure vessels for pressure vessel containers.
NOTE 1   In the context of this standard the term "road tanker" is understood to mean "fixed tanks" and "demountable tanks" as defined in ADR.
NOTE 2   The equipment for the pressure vessels and the inspection and testing after assembly is covered by EN 12252 and EN 14334, respectively.
NOTE 3   The design type of the road tanker is subject to approval by the competent authority, as required by ADR.
NOTE 4   This standard is intended for LPG only; however for other liquefied gases see EN 14025

Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte Druckbehälter aus Stahl für Straßentankwagen für Flüssiggas (LPG) - Auslegung und Herstellung

Dieses Dokument legt Mindestanforderungen an Werkstoffe, Auslegung, Bau und Ausführungsverfahren sowie Prüfungen für geschweißte Druckbehälter für Straßentankwagen für Flüssiggas (LPG, en: liquefied petroleum gas) und deren angeschweißtes Zubehör fest, die aus Kohlenstoffstahl, Kohlenstoff-Manganstahl und mikrolegiertem Stahl hergestellt werden.
Es besteht keine Obergrenze für die Größe, da diese durch die Begrenzung der Bruttomasse des Fahrzeuges festgelegt wird.
Dieses Dokument gilt nicht für Druckbehälter für Tankcontainer.
ANMERKUNG 1 Im Sinne dieses Dokuments ist der Begriff „Straßentankwagen“ entsprechend der Definition im ADR als „fest verbundene Tanks“ und „Aufsetztanks“ zu verstehen.
ANMERKUNG 2 Die Ausrüstung der Druckbehälter sowie die Inspektion und Prüfung nach dem Zusammenbau ist durch EN 12252 bzw. EN 14334 abgedeckt.
ANMERKUNG 3 Das Baumuster des Straßentankwagens unterliegt entsprechend der Anforderung des ADR einer Zulassung durch die zuständige Behörde.
ANMERKUNG 4 Dieses Dokument gilt nur für LPG, andere verflüssigte Gase werden jedoch von EN 14025 abgedeckt.

Équipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés des camions-citernes pour GPL - Conception et construction

Le présent document spécifie les exigences minimales relatives aux matériaux, à la conception, à la construction et à la qualité d’exécution, ainsi que les essais des réservoirs sous pression soudés de camions-citernes utilisés pour le transport du GPL et de leurs accessoires soudés fabriqués en acier au carbone, en acier au carbone/manganèse et en acier micro-allié.
Il ne définit pas de taille limite supérieure pour le réservoir étant donné que celle-ci sera déterminée par la limite du poids total en charge du véhicule.
Le présent document ne couvre pas les réservoirs sous pression destinés à des conteneurs-citernes.
NOTE 1 Dans le cadre du présent document, le terme « camion-citerne » signifie « réservoirs fixes » et « réservoirs démontables » comme définis dans l'ADR.
NOTE 2 L'équipement des camions-citernes et leurs contrôles et essais après construction sont couverts respectivement par les normes EN 12252 et EN 14334.
NOTE 3 Le mode de conception du camion-citerne est sujet à l'approbation de l'autorité compétente comme prévu dans l'ADR.
NOTE 4 Le présent document est uniquement destinée aux GPL ; toutefois, pour d’autres gaz liquéfiés, voir l’EN 14025.

Oprema in pribor za utekočinjeni naftni plin (UNP) - Varjene tlačne posode cestnih cistern iz jekla za UNP - Konstruiranje in proizvodnja

General Information

Status
Published
Public Enquiry End Date
03-Nov-2019
Publication Date
11-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jan-2021
Due Date
12-Mar-2021
Completion Date
12-Jan-2021

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SLOVENSKI STANDARD
SIST EN 12493:2021
01-februar-2021
Nadomešča:
SIST EN 12493:2013+A2:2018
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varjene tlačne posode cestnih
cistern iz jekla za UNP - Konstruiranje in proizvodnja
LPG equipment and accessories - Welded steel pressure vessels for LPG road tankers -
Design and manufacture
Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte Druckbehälter aus Stahl für
Straßentankwagen für Flüssiggas (LPG) - Auslegung und Herstellung
Équipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés
des camions-citernes pour GPL - Conception et construction
Ta slovenski standard je istoveten z: EN 12493:2020
ICS:
23.020.35 Plinske jeklenke Gas cylinders
43.080.10 Tovornjaki in priklopniki Trucks and trailers
SIST EN 12493:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 12493:2021

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SIST EN 12493:2021


EN 12493
EUROPEAN STANDARD

NORME EUROPÉENNE

December 2020
EUROPÄISCHE NORM
ICS 23.020.30; 23.020.35 Supersedes EN 12493:2013+A2:2018
English Version

LPG equipment and accessories - Welded steel pressure
vessels for LPG road tankers - Design and manufacture
Équipements pour GPL et leurs accessoires - Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte
Réservoirs sous pression en acier soudés des camions - Druckbehälter aus Stahl für Straßentankwagen für
Conception et construction Flüssiggas (LPG) - Auslegung und Herstellung
This European Standard was approved by CEN on 16 November 2020.

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, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12493:2020 E
worldwide for CEN national Members.

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SIST EN 12493:2021
EN 12493:2020 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Materials . 9
4.1 Environmental. 9
4.2 Suitability . 9
4.3 Pressure retaining parts . 9
4.4 Non-pressure retaining parts . 9
4.5 Welding consumables . 9
4.6 Non-metallic materials (gaskets) . 10
4.7 Inspection documents for materials . 10
5 Pressure vessel design . 10
5.1 Design conditions . 10
5.2 Minimum thickness . 10
5.3 Surge plates . 11
5.4 Doubler plates . 12
5.5 Stresses due to motion . 12
5.6 Self-supporting pressure vessels. 12
5.7 Vacuum conditions . 12
5.8 Pressure vessel mountings . 12
5.9 Internal pipework . 13
6 Openings . 13
6.1 General . 13
6.2 Reinforcement of openings. 13
6.3 Threaded connections . 13
6.4 Manhole . 13
7 Non-pressure retaining parts . 14
7.1 Attachment welds . 14
7.2 Position of attachment welds . 14
8 Workmanship and construction . 14
8.1 General . 14
8.2 Environment . 14
8.3 Control of materials. 14
8.4 Acceptable weld details . 15
8.5 Heat treatment and forming . 15
8.6 Welding . 17
8.7 Repairs to pressure envelope and direct attachment welds . 19
9 Construction and workmanship of internal pipework . 19
10 Manufacturing tests and examinations . 19
10.1 General . 19
10.2 Mechanical testing . 20
2

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SIST EN 12493:2021
EN 12493:2020 (E)
10.3 Non-destructive testing . 21
10.4 Non-destructive testing for welds . 21
10.5 Qualification of non-destructive testing personnel . 22
10.6 Visual examination of welds . 22
10.7 Acceptance criteria . 23
10.8 Safety precautions at the hydraulic test . 23
11 External corrosion protection and finishing . 23
11.1 External protection . 23
11.2 Finishing operations . 23
12 Marking . 23
13 Records and documentation . 23
13.1 Documentation obtained by the manufacturer . 23
13.2 Records prepared by the manufacturer . 23
13.3 Retention and supply of documents . 24
Annex A (normative) Guidance on selection of materials grades . 25
Annex B (normative) Reference temperatures for design . 26
Annex C (informative) Alternative reference temperatures for design . 27
Annex D (normative) Design . 28
Annex E (informative) Example of joints . 43
Annex F (normative) Allowable tolerances . 47
Annex G (normative) Heat treatment . 52
Annex H (informative) Typical method for measurement of shell peaking . 53
Annex I (informative) Choice of non-destructive test methods for welds . 56
Annex J (normative) Hydraulic pressure test . 57
Bibliography . 58

3

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SIST EN 12493:2021
EN 12493:2020 (E)
European foreword
This document (EN 12493:2020) has been prepared by Technical Committee /TC 286 “LPG equipment
and accessories”, the secretariat of which is held by NSAI.
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 June 2021, and conflicting national standards shall be
withdrawn at the latest by June 2021.
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 12493:2013+A2:2018.
The following main changes have been introduced during this revision:
— removal of Annex I, Welding imperfections and test specimens;
— addition of normative reference to EN 12972.
This document has been submitted for reference in:
— the RID and/or;
— the technical annexes of the ADR.
NOTE These regulations take precedence over any clause of this document. It is emphasized that
RID/ADR are being revised regularly at intervals of two years which may lead to temporary non-
compliances with the clauses of this document.
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, 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, Turkey and the United
Kingdom.
4

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SIST EN 12493:2021
EN 12493:2020 (E)
Introduction
This document calls for the use of substances and procedures that could be injurious to health and/or the
environment if adequate precautions are not taken. It refers only to technical suitability: it does not
absolve the user from their legal obligations at any stage.
Protection of the environment is a key political issue in Europe and elsewhere. For CEN/TC 286 this is
covered in CEN/TS 16765 [7] LPG equipment and accessories — Environmental considerations for
CEN/TC 286 standards; which should be read in conjunction with this document. The Technical
Specification provides guidance on the environmental aspects to be considered regarding equipment and
accessories produced for the LPG industry and the following is addressed:
a) design;
b) manufacture;
c) packaging;
d) use and operation;
e) disposal.
It is recommended that manufacturers develop an environmental management policy. For guidance, see
EN ISO 14000 series (see [8], [9] and [10]).
Provisions need to be restricted to a general guidance. Limit values are specified in national laws.
It has been assumed in the drafting of this document that the execution of its provisions is entrusted to
appropriately qualified and experienced people.
All pressures are gauged unless otherwise stated.
NOTE This document requires measurement of material properties, dimensions and pressures. All such
measurements are subject to a degree of uncertainty due to tolerances in measuring equipment, etc. It might be
beneficial to refer to the leaflet “measurement uncertainty leaflet” SP INFO 2000 27 [15].
5

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SIST EN 12493:2021
EN 12493:2020 (E)
1 Scope
This document specifies minimum requirements for materials, design, construction and workmanship
procedures, and tests for welded LPG road tanker pressure vessels and their welded attachments
manufactured from carbon, carbon/manganese and micro alloy steels.
There is no upper size limit as this is determined by the gross vehicle weight limitation.
This document does not cover pressure vessels for pressure vessel containers.
NOTE 1 In the context of this document, the term “road tanker” is understood to mean “fixed tanks” and
“demountable tanks” as defined in ADR.
NOTE 2 The equipment for the pressure vessels and the inspection and testing after assembly is covered by
EN 12252 and EN 14334, respectively.
NOTE 3 The design type of the road tanker is subject to approval by the competent authority, as required by
ADR.
NOTE 4 This document is intended for LPG only; however, for other liquefied gases see EN 14025.
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 837-2, Pressure gauges — Part 2: Selection and installation recommendations for pressure gauges
EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy
structural steels
EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with
specified elevated temperature properties
EN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels,
normalized
EN 10204, Metallic products — Types of inspection documents
EN 12972:2018, Tanks for transport of dangerous goods — Testing, inspection and marking of metallic
tanks
EN 13445-3, Unfired pressure vessels — Part 3: Design
EN 14717, Welding and allied processes — Environmental check list
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)
EN ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles (ISO 3452-1)
EN ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive
quality requirements (ISO 3834-2)
EN ISO 4136, Destructive tests on welds in metallic materials — Transverse tensile test (ISO 4136)
EN ISO 5173, Destructive tests on welds in metallic materials — Bend tests (ISO 5173)
6

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SIST EN 12493:2021
EN 12493:2020 (E)
EN ISO 5178, Destructive tests on welds in metallic materials — Longitudinal tensile test on weld metal in
fusion welded joints (ISO 5178)
EN ISO 5579, Non-destructive testing — Radiographic testing of metallic materials using film and X- or
gamma rays — Basic rules (ISO 5579)
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 6520-1, Welding and allied processes — Classification of geometric imperfections in metallic
materials — Part 1: Fusion welding (ISO 6520-1)
EN ISO 6520-2, Welding and allied processes — Classification of geometric imperfections in metallic
materials — Part 2: Welding with pressure (ISO 6520-2)
EN ISO 9016, Destructive tests on welds in metallic materials — Impact tests — Test specimen location,
notch orientation and examination (ISO 9016)
EN ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
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 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding (ISO 15609-1)
EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
(ISO 15614-1)
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 17636-2, Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray
techniques with digital detectors (ISO 17636-2)
EN ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints (ISO 17637)
EN ISO 17638, Non-destructive testing of welds — Magnetic particle testing (ISO 17638)
EN ISO 17639, Destructive tests on welds in metallic materials — Macroscopic and microscopic
examination of welds (ISO 17639)
EN ISO 17640, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment (ISO 17640)
EN ISO 19232-1, Non-destructive testing — Image quality of radiographs — Part 1: Determination of the
image quality value using wire-type image quality indicators (ISO 19232-1)
EN ISO 19232-2, Non-destructive testing — Image quality of radiographs — Part 2: Determination of the
image quality value using step/hole-type image quality indicators (ISO 19232-2)
7

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SIST EN 12493:2021
EN 12493:2020 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
liquefied petroleum gas
LPG
low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011,
UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane,
butane isomers, butene with traces of other hydrocarbon gases
3.2
yield strength
upper yield strength ReH or, for steels that do not exhibit a definite yield (non-proportional elongation),
the 0,2 % proof strength
3.3
cold forming
forming at temperatures not less than 25 °C below the maximum permissible temperature for stress
relieving, in accordance with the applicable material specifications
3.4
hot forming
forming at temperatures above the temperature for stress relieving as stated in the material
specifications
3.5
sun shield
shield covering not less than the upper third but not more than the upper half of the shell surface,
separated from the shell by an air gap of at least 40 mm
3.6
pressure vessel
assembly of the pressure-retaining envelope (including the openings and their closures) and non-
pressure-retaining parts attached directly to it
Note 1 to entry: Also referred to as “tank” in the ADR.
3.7
competent authority
authority or authorities or any other body or bodies designated as such in each State and in each specific
case in accordance with domestic law
3.8
inspection body
independent inspection and testing body approved by the competent authority
8

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SIST EN 12493:2021
EN 12493:2020 (E)
3.9
competent person
person which by combination of appropriate qualification, training, experience, and resources, is able to
make objective judgments on the subject
4 Materials
4.1 Environmental
The manufacturer shall endeavour to acquire materials and components from suppliers who have a
declared environmental policy, see EN ISO 14021, EN ISO 14024 and EN ISO 14025.
4.2 Suitability
4.2.1 Unless otherwise specified by the design documents, the design temperature range shall be
−20 °C to +50 °C.
4.2.2 The materials of construction shall be suitable for operating within the envisaged temperature
range. If the pressure vessel could be subjected to more severe lower ambient or product temperatures,
the design temperature range shall be −40 °C to +50 °C.
4.2.3 Guidance on selection of material grades is given in Annex A.
4.2.4 If additional impact testing is required, it shall be carried out in accordance with EN ISO 148-1 to
achieve the impact values specified in 10.2.5.5.
4.2.5 The materials of the pressure receptacle which are in contact with the contents shall not contain
substances liable to substantially weaken the material. The steel grades specified in EN 10028-2 and
EN 10028-3, listed in Table A.1, are considered compatible with LPG complying with the limitations on
corrosiveness as specified in ISO 9162.
4.3 Pressure retaining parts
Pressure-retaining materials shall be of appropriate steels conforming to EN 10028-2 or EN 10028-3 or
shall conform to specifications agreed with the competent authority. All materials shall conform to 10.2.4
and the ratio of the specified yield strength (R ) to minimum tensile strength (Rm) shall not exceed 0,85
eH
(i.e. R /Rm ≤ 0,85). The percentage elongation at fracture shall be not less than 10 000 divided by the
eH
2
actual tensile strength in N/mm , and in any case shall be not less than 16 % for fine grained steels and
not less than 20 % for other steels. Where fine grain steels are used, the guaranteed yield strength, R
eH
2 2
shall not exceed 460 N/mm and the upper tensile strength, R , shall not exceed 725 N/mm .
m
4.4 Non-pressure retaining parts
Non-pressure retaining parts that are directly welded to pressure retaining parts shall be of suitable
materials conforming to EN 10025-2 or materials with characteristics approved by a competent
authority. All materials used for non-pressure retaining parts shall be compatible with the material of
pressure retaining parts, and shall conform to the impact requirements of 10.2.5.5, tested in accordance
with the method specified in EN ISO 148-1.
4.5 Welding consumables
Welding consumables shall be able to provide consistent welds with properties at least equal to those
specified for the parent materials in the finished pressure vessel.
9

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SIST EN 12493:2021
EN 12493:2020 (E)
4.6 Non-metallic materials (gaskets)
Non-metallic materials (gaskets) shall be compatible with both phases of LPG over the range of pressures
and temperatures for which the road tanker is designed (see 4.2, Annex B and Annex C).
4.7 Inspection documents for materials
Pressure retaining parts and non-pressure retaining parts directly welded to the pressure vessel shall be
provided with the material manufacturers’ certificates conforming to EN 10204 certificate type 3.1. Other
parts shall have certificates conforming to EN 10204 certificate type 2.2.
5 Pressure vessel design
5.1 Design conditions
5.1.1 The reference temperatures shall conform to Annex B. Where it is authorized by a national
competent authority for use within its territory, in accordance with the provision of EU Council Directive
2008/68/EC [13], the reference temperatures designated in Annex C apply.
5.1.2 Design calculations shall be carried out in accordance with Annex D.
5.1.3 Account shall be taken of the fatigue loading on all component parts of the pressure vessel and its
attachments by conducting an assessment or through proven operating experience.
5.1.4 The design of the pressure vessel should take into account the following:
— minimizing the use of materials;
— fittings required for efficient operation of the pressure vessel;
— minimizing the environmental impact of in service maintenance and end of life disposal.
5.2 Minimum thickness
5.2.1 The minimum thickness for pressure vessels not exceeding a diameter of 1,8 m shall be 5 mm of
1)
reference steel or of an equivalent thickness if in a different steel.
5.2.2 For pressure vessels exceeding a diameter of 1,8 m, the minimum thickness shall be 6 mm of
1)
reference steel or of an equivalent thickness if in a different steel.

1)
As defined in ADR.
10

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SIST EN 12493:2021
EN 12493:2020 (E)
5.2.3 The equivalent thickness shall be calculated using Formula (1):
464e
0
e =
1
2
3
RA
( )
m11
 (1)
where
A minimum elongation at fracture (%) of steel chosen under tensile stress;
1
e minimum shell
...

SLOVENSKI STANDARD
oSIST prEN 12493:2019
01-oktober-2019
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varjene tlačne posode cestnih
cistern iz jekla za UNP - Konstruiranje in proizvodnja
LPG equipment and accessories - Welded steel pressure vessels for LPG road tankers -
Design and manufacture
Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte Druckbehälter aus Stahl für
Straßentankwagen für Flüssiggas (LPG) - Auslegung und Herstellung
Équipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés
des camions-citernes pour GPL - Conception et construction
Ta slovenski standard je istoveten z: prEN 12493
ICS:
23.020.35 Plinske jeklenke Gas cylinders
43.080.10 Tovornjaki in priklopniki Trucks and trailers
oSIST prEN 12493:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 12493:2019

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oSIST prEN 12493:2019


DRAFT
EUROPEAN STANDARD
prEN 12493
NORME EUROPÉENNE

EUROPÄISCHE NORM

September 2019
ICS 23.020.30; 23.020.35 Will supersede EN 12493:2013+A2:2018
English Version

LPG equipment and accessories - Welded steel pressure
vessels for LPG road tankers - Design and manufacture
Équipements pour GPL et leurs accessoires - Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte
Réservoirs sous pression en acier soudés des camions- Druckbehälter aus Stahl für Straßentankwagen für
citernes pour GPL - Conception et construction Flüssiggas (LPG) - Auslegung und Herstellung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 286.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


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. prEN 12493:2019 E
worldwide for CEN national Members.

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prEN 12493:2019 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Materials . 11
4.1 Environmental. 11
4.2 Suitability . 11
4.3 Pressure retaining parts . 11
4.4 Non-pressure retaining parts . 11
4.5 Welding consumables . 11
4.6 Non-metallic materials (gaskets) . 12
4.7 Inspection documents for materials . 12
5 Pressure vessel design . 12
5.1 Design conditions . 12
5.2 Minimum thickness . 12
5.3 Surge plates . 13
5.4 Doubler plates . 13
5.5 Stresses due to motion . 13
5.6 Self-supporting pressure vessels. 14
5.7 Vacuum conditions . 14
5.8 Pressure vessel mountings . 14
5.9 Internal pipework . 14
6 Openings . 14
6.1 General . 14
6.2 Reinforcement of openings. 15
6.3 Threaded connections . 15
6.4 Manhole . 15
7 Non-pressure retaining parts . 15
7.1 Attachment welds . 15
7.2 Position of attachment welds . 15
8 Workmanship and construction . 15
8.1 General . 15
8.2 Environment . 16
8.3 Control of materials. 16
8.4 Acceptable weld details . 16
8.5 Heat treatment and forming . 17
8.5.1 Cold forming . 17
8.5.2 Hot forming . 17
8.5.3 Testing of formed parts . 17
8.5.4 Visual examination and control of dimensions . 18
8.5.5 Marking . 18
8.6 Welding . 18
8.6.1 General . 18
8.6.2 Longitudinal welds . 18
8.6.3 Welding procedure specification (WPS) . 19
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8.6.4 Qualification of WPS . 19
8.6.5 Qualification of welders and welding operators . 19
8.6.6 Preparation of edges . 19
8.6.7 Attachments and fastenings . 19
8.6.8 Preheat . 19
8.7 Post-weld heat treatment . 20
8.8 Manufacturing tolerances. 20
8.9 Repairs to pressure envelope and direct attachment welds . 20
8.9.1 General requirements . 20
8.9.2 Repair of surface imperfections in the parent metal . 20
8.9.3 Repair of weld imperfections . 20
9 Construction and workmanship of internal pipework . 21
10 Manufacturing tests and examinations . 21
10.1 General . 21
10.2 Mechanical testing . 21
10.2.1 Production test plates . 21
10.2.2 Longitudinal welds . 21
10.2.3 Circumferential welds . 21
10.2.4 Mechanical tests . 21
10.2.5 Test requirements . 21
10.3 Non-destructive testing . 22
10.3.1 General . 22
10.3.2 Internal imperfections . 23
10.3.3 Surface imperfections . 23
10.4 Non-destructive testing for welds . 23
10.4.1 Radiographic testing . 23
10.4.2 Marking and identification of radiographs . 23
10.4.3 Ultrasonic testing . 23
10.4.4 Magnetic particle testing. 23
10.4.5 Penetrant testing . 24
10.5 Qualification of non-destructive testing personnel . 24
10.6 Visual examination of welds . 24
10.7 Acceptance criteria . 24
10.8 Safety precautions at the hydraulic test . 24
11 External corrosion protection and finishing . 24
11.1 External protection . 24
11.2 Finishing operations . 24
12 Marking . 24
13 Records and documentation . 25
13.1 Documentation obtained by the manufacturer . 25
13.2 Records prepared by the manufacturer . 25
13.3 Retention and supply of documents . 25
Annex A (normative) Guidance on selection of material grades . 26
Annex B (normative) Reference temperatures for design . 27
B.1 Introduction. 27
B.2 General . 27
B.3 Developed pressure . 27
B.4 Filling . 27
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Annex C (informative) Alternative reference temperatures for design . 28
C.1 Introduction . 28
C.2 General . 28
C.3 Developed pressure . 28
C.4 Filling . 28
Annex D (normative) Design . 29
D.1 Design stresses . 29
D.1.1 D.1.1 . The nominal design stress, f, shall be the lesser of Formula (D.1) or
Formula (D.2): . 29
D.1.2 D.1.2 . The following units shall be used in the formulae in this
annex: . 29
D.2 Design pressure . 29
D.3 Design formulae . 29
D.3.1 Cylindrical shell calculation . 29
D.3.2 Dished ends . 30
D.3.2.1 Minimum thickness . 30
D.3.2.2 Torispherical end calculation . 30
D.3.2.3 Ellipsoidal end calculation . 31
D.3.2.4 Hemispherical ends . 31
D.3.2.5 Formulae for calculating β . 32
D.3.3 Conical shell calculations . 33
D.3.3.1 General requirements . 33
D.3.3.2 Thickness of conical shell . 33
D.3.3.3 Junction between large end of a cone and a cylinder without a knuckle . 34
D.3.3.4 Junction between the small end of a cone and a cylinder . 35
D.4 Nozzle reinforcement . 37
D.5 Nozzle reinforcement by pads or flanges . 39
D.6 Nozzle reinforcement by branches . 40
Annex E (informative) Example of joints . 44
Annex F (normative) Allowable tolerances . 48
F.1 Pressure vessels . 48
F.1.1 External diameter . 48
F.1.2 Out of roundness . 48
F.1.3 Deviation of straightness. 48
F.1.4 Irregularities in profile . 49
F.2 Dished end tolerance . 49
F.2.1 Thickness of material . 49
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F.2.2 Profile. 49
F.3 Assembly tolerances . 50
F.3.1 Middle line alignment . 50
F.3.2 Surface alignment . 50
F.4 Attachments, nozzles and fittings . 51
F.5 Overall length . 51
Annex G (normative) Heat treatment . 52
G.1 Method of post-weld heat treatment . 52
G.2 Temperature control . 52
G.3 Temperature limit . 52
G.4 Temperature measurement . 52
Annex H (informative) Typical method for measurement of shell peaking . 53
H.1 Profile gauge . 53
H.2 Peaking survey . 53
Annex I (informative) Choice of non-destructive test methods for welds . 56
I.1 Internal imperfections . 56
I.2 Surface imperfections . 56
Annex J (normative) Hydraulic pressure test . 57
J.1 Temporary fittings . 57
J.2 Pressure gauges . 57
J.3 Pressurizing agent . 57
J.4 Avoidance of shock . 57
J.5 Applied pressure . 57
Bibliography . 58

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prEN 12493:2019 (E)
European foreword
This document (prEN 12493:2019) has been prepared by Technical Committee CEN/TC 286 “Liquefied
petroleum gas equipment and accessories”, the secretariat of which is held by NSAI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12493:2013+A2:2018.
This document supports the EU Directive 2008/68/EC and the associated Transport of Dangerous Goods
Regulation, notably the RID and the ADR.
This document has been submitted for reference into the technical annexes of the ADR [15].
NOTE These regulations take precedence over any clause of this document. It is emphasized that
RID/ADR/ADN are being revised regularly at intervals of two years which could lead to temporary non-compliances
with the clauses of this document.
The following main changes have been introduced during this revision:
— removal of Annex I, Welding imperfections and test specimens;
— addition of normative reference to EN 12972.
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Introduction
This document calls for the use of substances and procedures that could be injurious to health and/or the
environment if adequate precautions are not taken. It refers only to technical suitability: it does not
absolve the user from their legal obligations at any stage.
Protection of the environment is a key political issue in Europe and elsewhere. For CEN/TC 286 this is
covered in CEN/TS 16765 [9] LPG equipment and a
...

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