Transportable gas cylinders - Refillable welded steel gas cylinders - Design and construction - Part 1: Carbon steel

This document specifies minimum requirements concerning material, design, construction and workmanship, manufacturing processes and testing of refillable transportable welded carbon steel gas cylinders of water capacities up to and including 150 l for compressed, liquefied and dissolved gases.
For acetylene service, additional requirements for the cylinder and basic requirements for the porous mass are given in EN ISO 3807. For cylinder shells for acetylene service manufactured from high frequency induction (HFI) welded steel tubes by spinning of the end, the requirements are given in Annex A.
This document is primarily for industrial gases other than LPG but can also be applied for LPG. However for dedicated LPG cylinders, see EN 1442, Transportable refillable welded steel cylinders for liquefied petroleum gas (LPG) - Design and construction prepared by CEN/TC 286 Liquefied petroleum gas equipment and accessories.

Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Flaschen aus Stahl - Auslegung und Herstellung - Teil 1: Flaschen aus Kohlenstoffstahl

Dieses Dokument legt Mindestanforderungen bezüglich Werkstoff, Auslegung, Herstellung und Ausführung, Herstellungsprozessen und Prüfung von wiederbefüllbaren geschweißten ortsbeweglichen Gasflaschen aus Kohlenstoffstahl mit einem Fassungsraum bis einschließlich 150 l für verdichtete, verflüssigte und unter Druck gelöste Gase fest.
Die Anforderungen für Flaschen aus hochfrequenzinduktiv (HFI) geschweißten Stahlrohren mit gedrehtem Ende sind in Anhang A angegeben. Dieses Dokument gilt in erster Linie für andere Industriegase als Flüssiggas (LPG, en: liquefied petroleum gas), kann aber auch für Flüssiggas angewendet werden. Für besondere Flaschen für Flüssiggas (LPG) siehe jedoch EN 1442 "Ortsbewegliche, wiederbefüllbare, geschweißte Flaschen aus Stahl für Flüssiggas (LPG) - Auslegung und Bau", die vom CEN/TC 286 "Flüssiggas-Geräte und Ausrüstungsteile" erarbeitet wurde.

Bouteilles a gaz transportables - Bouteilles a gaz rechargeables soudées en acier - Conception et construction - Partie 1: Acier au carbone

Le présent document spécifie les exigences minimales concernant les matériaux, la conception, la construction et l’exécution, ainsi que les procédés de fabrication et les essais des bouteilles à gaz transportables et rechargeables en acier au carbone soudées ayant une capacité en eau allant jusqu’à 150 l inclus, destinées à transporter des gaz comprimés, liquéfiés et dissous.
Pour les bouteilles faites à partir de tubes en acier soudés par induction à haute fréquence (IHF) par emboutissage de l’extrémité, les exigences sont données dans l’Annexe A. Ce document concerne principalement les gaz industriels autres que le GPL, mais peut aussi être appliqué au GPL. Cependant, pour les bouteilles à gaz dédiées au GPL, voir l’EN 1442, Équipements pour GPL et leurs accessoires
- Bouteilles en acier soudé transportables et rechargeables pour gaz de pétrole liquéfiés (GPL)
- Conception et fabrication, préparée par le CEN/TC 286, Équipement et accessoires pour gaz de pétrole liquéfiés.

Premične plinske jeklenke - Ponovno polnljive varjene jeklenke iz jekla - Konstruiranje in izdelava - 1. del: Jeklenke iz ogljičnega jekla

General Information

Status
Not Published
Public Enquiry End Date
01-Oct-2021
Technical Committee
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
04-Aug-2021
Due Date
22-Dec-2021
Completion Date
24-Nov-2021

Relations

Buy Standard

Draft
prEN 13322-1:2021
English language
42 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 13322-1:2021
01-september-2021
Premične plinske jeklenke - Ponovno polnljive varjene jeklenke iz jekla -
Konstruiranje in izdelava - 1. del: Jeklenke iz ogljičnega jekla
Transportable gas cylinders - Refillable welded steel gas cylinders - Design and
construction - Part 1: Carbon steel
Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Flaschen aus Stahl -
Auslegung und Herstellung - Teil 1: Flaschen aus Kohlenstoffstahl
Bouteilles a gaz transportables - Bouteilles a gaz rechargeables soudées en acier -
Conception et construction - Partie 1: Acier au carbone
Ta slovenski standard je istoveten z: prEN 13322-1
ICS:
23.020.35 Plinske jeklenke Gas cylinders
oSIST prEN 13322-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 13322-1:2021

---------------------- Page: 2 ----------------------
oSIST prEN 13322-1:2021


DRAFT
EUROPEAN STANDARD
prEN 13322-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

September 2021
ICS 23.020.35 Will supersede EN 13322-1:2003
English Version

Transportable gas cylinders - Refillable welded steel gas
cylinders - Design and construction - Part 1: Carbon steel
 Ortsbewegliche Gasflaschen - Wiederbefüllbare
geschweißte Flaschen aus Stahl - Auslegung und
Herstellung - Teil 1: Flaschen aus Kohlenstoffstahl
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 23.

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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13322-1:2021 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope. 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Terms and definitions . 7
3.2 Symbols . 8
4 Materials and heat treatment . 9
4.1 General . 9
4.2 Heat treatment . 9
5 Design . 10
5.1 General requirements . 10
5.2 Calculation of cylindrical wall thickness . 10
5.3 Design of convex ends (see Figure 1) . 10
5.4 Minimum wall thickness . 12
5.5 Ends of other shapes . 13
5.6 Design of openings . 13
6 Construction and workmanship . 13
6.1 General . 13
6.2 Welding procedures. 13
6.3 Welded joints of pressure containing parts . 13
6.4 Non-pressure-containing attachments . 14
6.5 Valve protection . 14
6.6 Neck threads . 14
6.7 Visual examination . 14
7 New design tests . 15
7.1 General requirements . 15
7.2 Verifications and tests . 16
7.3 Descriptions of tests . 17
7.4 Design testing certificate . 18
8 Batch tests . 18
8.1 General . 18
8.2 Information . 18
8.3 Checks and verifications . 18
8.4 Tensile test . 19
8.5 Bend test . 22
8.6 Impact test . 24
8.7 Macroscopic examination of weld cross-sections . 25
9 Tests on every cylinder . 25
9.1 Pressure test . 25
9.2 Leakage test . 25
10 Failure to meet test requirements . 25
2

---------------------- Page: 4 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
11 Records . 26
12 Marking . 26
Annex A (normative) Cylinders made from longitudinal seam high frequency induction (HFI)
welded tube by spinning of the end . 27
Annex B (normative) Radiographic examination of welds . 29
Annex C (normative) Description, evaluation of manufacturing defects and conditions for
rejection of welded steel gas cylinders at time of visual inspection . 32
Annex D (informative) Examples of design and batch test certificates . 35
Bibliography . 42

3

---------------------- Page: 5 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
European foreword
This document (prEN 13322-1:2021) has been prepared by Technical Committee CEN/TC 23
“Transportable gas cylinders”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13322-1:2003, including EN 13322-1:2003/A1:2006.
In comparison with the previous edition, the following technical modifications have been made:
— updating of the normative references,
— removal of the limit of a minimal water capacity of 0,5 l,
— addition of a new subclause 8.4.4 “Requirements for ductility testing of small cylinders”,
— modification of term 3.1 from yield stress to yield strength,
— update according to the latest requirements on standards to be proposed for ADR,
— clarification of the verbal forms for expression of provisions,
— removal of Annex E.
This document has been submitted for reference in
— the RID [4]; and
— the technical annexes of the ADR [5].
NOTE These regulations take precedence over any clause of this standard. It is emphasized that RID/ADR are
being revised regularly at intervals of two years which can lead to temporary non-compliances with the clauses of
this standard.
This standard is one of a series of two standards concerning refillable welded steel gas cylinders of water
capacities up to and including 150 l for compressed, liquefied and dissolved gases:
— Part 1: Carbon steel
— Part 2: Stainless steel
Annexes A, B and C are normative. Annex D is informative.
4

---------------------- Page: 6 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
Introduction
The purpose of this document is to provide a specification for the design, manufacture, and testing of
refillable, transportable, welded steel gas cylinders.
The specifications given are based on knowledge of, and experience with, materials, design requirements,
manufacturing processes and control during manufacture, of cylinders in common use in the countries of
the CEN members.
This document is based on the traditional calculation method. It does not cover other methods such as
finite element analysis (F.E.A) methods or experimental methods.
5

---------------------- Page: 7 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
1 Scope
This document specifies minimum requirements concerning material, design, construction and
workmanship, manufacturing processes and testing of refillable transportable welded carbon steel gas
cylinders of water capacities up to and including 150 l for compressed, liquefied and dissolved gases.
For cylinders made from high frequency induction (HFI) welded steel tubes by spinning of the end, the
requirements are given in Annex A. This document is primarily for industrial gases other than LPG but
can also be applied for LPG. However, for dedicated LPG cylinders, see EN 1442, Transportable refillable
welded steel cylinders for liquefied petroleum gas (LPG) - Design and construction prepared by CEN/TC 286
Liquefied petroleum gas equipment and accessories.
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 1442, LPG equipment and accessories - Transportable refillable welded steel cylinders for LPG - Design
and construction
EN 10028-1, Flat products made of steels for pressure purposes - Part 1: General requirements
EN 10028-3, Flat products made of steels for pressure purposes - Part 3: Weldable fine grain steels,
normalized
EN 10028-5, Flat products made of steels for pressure purposes - Part 5: Weldable fine grain steels,
thermomechanically rolled
EN 10120, Steel sheet and strip for welded gas cylinders
EN 13445-2, Unfired pressure vessels - Part 2: Materials
EN ISO 148-1, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-1:2016)
EN ISO 683-1, Heat-treatable steels, alloy steels and free-cutting steels - Part 1: Non-alloy steels for
quenching and tempering (ISO 683-1:2016)
EN ISO 3183, Petroleum and natural gas industries - Steel pipe for pipeline transportation systems (ISO
3183:2019)
EN ISO 5817, Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) - Quality levels for imperfections (ISO 5817:2014)
EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-
1:2019)
EN ISO 9606-1, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1:2012 including
Cor 1:2012 and Cor 2:2013)
EN ISO 9712, Non-destructive testing - Qualification and certification of NDT personnel (ISO 9712:2012)
EN ISO 9809-3, Gas cylinders - Design, construction and testing of refillable seamless steel gas cylinders and
tubes - Part 3: Normalized steel cylinders and tubes (ISO 9809-3:2019)
6

---------------------- Page: 8 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
EN ISO 10675-1, Non-destructive testing of welds - Acceptance levels for radiographic testing - Part 1: Steel,
nickel, titanium and their alloys (ISO 10675-1:2016)
EN ISO 11114-1, Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1:
Metallic materials (ISO 11114-1:2020)
EN ISO 11117, Gas cylinders - Valve protection caps and guards - Design, construction and tests (ISO
11117:2019)
EN ISO 13769, Gas cylinders - Stamp marking (ISO 13769:2018)
EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules
(ISO 15607:2019)
EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding
procedure specification - Part 1: Arc welding (ISO 15609-1:2019)
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-
1:2017, Corrected version 2017-10-01)
EN ISO 17637, Non-destructive testing of welds - Visual testing of fusion-welded joints (ISO 17637:2016)
EN ISO 17636-1, Non-destructive testing of welds - Radiographic testing - Part 1: X- and gamma-ray
techniques with film (ISO 17636-1:2013)
EN ISO 17636-2, Non-destructive testing of welds - Radiographic testing - Part 2: X- and gamma-ray
techniques with digital detectors (ISO 17636-2:2013)
ISO 2504:1973, Radiography of welds and vewing conditions for films - Utilization of recommended
patterns of image quality indicators (I.Q.I.)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 10286 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
yield strength
stress corresponding to the point reached during the test at which plastic deformation occurs without
any increase in the force, in case the metallic material exhibits a yield phenomenon
[SOURCE: EN ISO 6892-1:2019, 3.10.2, modified]
3.1.2
normalizing
heat treatment in which a cylinder is heated to a uniform temperature above the upper critical point
(AC , as defined in EN ISO 4885) of the steel and then cooled in a controlled atmosphere
3
7

---------------------- Page: 9 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
3.1.3
stress relieving
heat treatment given to the finished cylinder, the object of which is to reduce the residual stresses without
altering the metallurgical structure of the steel, by heating to a uniform temperature below the lower
critical point (AC , as defined in EN ISO 4885) of the steel and cooling in a still atmosphere
1
3.1.4
batch
quantity of finished cylinders made consecutively during the same or consecutive days to the same
design, size and material specifications and from the same material supplier for each pressure containing
part on the same automatic welding machines and heat-treated under the same conditions of
temperature and duration
Note 1 to entry: This definition allows different suppliers to be used for the different pressure containing parts
within a batch, e.g. one supplier for heads, another for bases.
3.1.5
design stress factor (F)
ratio of equivalent wall stress at test pressure (p ) to guaranteed minimum yield strength (R )
h e
3.2 Symbols
a Calculated minimum thickness, in millimetres, of the cylindrical shell
a' Guaranteed minimum thickness, in millimetres, of the cylindrical shell (including any
corrosion allowance see 7.1)
a Calculated value of a used in the calculation of b (see 5.3.2)
1
A Percentage elongation after fracture
b Calculated minimum thickness, in millimetres, of the cylinder end (see Figure 1)
b' Guaranteed minimum thickness, in millimetres, of the cylinder end (see 7.1 )
C Shape factor of dished ends
D Outside diameter, in millimetres, of the cylinder (see Figure 1)
D Diameter of former in millimetres (see Figure 11)
f
F Design stress factor (see 3.1.5)
h Height, in millimetres, of the cylindrical part of the end (see Figure 1)
H Outside height, in millimetres, of the domed part of the end (see Figure 1)
J Stress reduction factor (see annex B)
L Length, in millimetres, of the cylinder
n Ratio of diameter of bend test former (D ) to the thickness of the test piece (t)
f
1
p Measured burst pressure, in bar , above atmospheric pressure, in the burst test
b
p Error! Bookmark not defined.)
h Hydraulic test pressure, in bar , above atmospheric pressure
r Inside radius of knuckle end, in millimetres (see Figure 1)
R Inside radius of the dished end, in millimetres (see Figure 1)

5
1
1 bar = 10 Pa = 0,1 MPa
8

---------------------- Page: 10 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
R Yield strength, in megapascals, as defined in 3.1.1 and used for design calculation
e
R Value of the actual yield strengthin megapascals determined by the tensile test
ea
R Minimum value of the upper yield strength, in megapascals, guaranteed by the cylinder
eH
manufacturer for the finished cylinder, in accordance with EN ISO 6892-1
R Minimum value of the lower yield strength, in megapascals, guaranteed by the cylinder
eL
manufacturer for the finished cylinder, in accordance with EN ISO 6892-1
R Minimum value of tensile strength, in megapascals, guaranteed by the cylinder
g
manufacturer for the finished cylinder
R Actual value of tensile strength, in megapascals, determined by the tensile test (see 8.4)
m
S Original cross-sectional area of tensile test piece, in square millimetres, according to EN
o
ISO 6892-1
t Actual thickness of the test specimen, in millimetres (see Figure 7)
4 Materials and heat treatment
4.1 General
4.1.1 Materials supplied for shells and end pressing shall conform to EN 10120, or EN 10028-1 and
EN 10028-3, or EN 10028-1 and EN 10028-5.
4.1.2 Materials supplied for bosses shall conform to EN ISO 683-1 and EN ISO 683-2.
4.1.3 Grades of steel used for the manufacture shall be compatible with the intended gas service (e.g.
corrosive gases, embrittling gases) in accordance with EN ISO 11114-1.
4.1.4 All parts welded to the cylinder shall be made of compatible material with respect to the
weldability.
4.1.5 The welding consumables shall be such that they are capable of giving consistent welds with
minimum tensile strength at least equal to that specified for the parent material in the finished cylinder.
4.1.6 The manufacturer shall obtain and provide certificates of the ladle analysis of the steel supplied
for the construction of the pressure retaining parts of the cylinder.
4.1.7 The manufacturer shall be able to guarantee cylinder steel casting traceability for each cylinder.
4.1.8 Cylinders for acetylene service shall be manufactured with materials compatible with the
manufacturing process of the porous mass, or an internal coating shall be applied.
4.2 Heat treatment
Cylinders shall be delivered in either the normalised or the stress-relieved condition. The cylinder
manufacturer shall certify that the cylinders have been heat-treated after completion of all welding and
shall certify the process of heat treatment applied. Localised heat treatment of cylinders is not permitted,
nor in the case of repaired cylinders.
The actual temperature of heat treatment to which a type of steel is subjected for a given tensile strength
shall not deviate by more than 30 °C from the temperature specified by the manufacturer for the cylinder
type.
9

---------------------- Page: 11 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
5 Design
5.1 General requirements
5.1.1 The calculation of the wall thickness of the pressure parts shall be related to the yield strengthof
the parent material.
5.1.2 For calculation purposes, the value of the yield strengthR is limited to a maximum of 0,85 R .
e g
5.1.3 The internal pressure upon which the calculation of gas cylinders is based shall be the test
pressure p .
h
5.1.4 A fully dimensioned drawing including the specification of the material shall be produced.
5.1.5 Cylinders for acetylene service shall be designed to allow for a test pressure of at least 60 bar.
5.1.6 Cylinders for acetylene service shall be designed and manufactured to ensure that conditions are
safe for the eventual filling of the porous mass, e.g. preventing sharp edges and voids.
5.2 Calculation of cylindrical wall thickness
The wall thickness of the cylindrical shell shall be not less than that calculated using the formula

D 10.F.J.R− 3.p
e h

a= ⋅−1

2 10.F.J.R
e

0,65
where the value of F is the lesser of or 0,77.
(RRe/ g )
R /R shall not exceed 0,85.
e g
The value of J shall be selected in accordance with Annex B.
The minimum wall thickness shall also satisfy the requirements of 5.4.
5.3 Design of convex ends (see Figure 1)
5.3.1 The shape of ends of gas cylinders shall be such that the following conditions are fulfilled:
— for torispherical ends (see Figure 1a): R ≤ D;
 r ≥ 0,1 D;
 h ≥ 4b.
— for ellipsoidal ends (see Figure 1b): H ≥ 0,192 D;
 h ≥ 4b.
5.3.2 The wall thickness of the ends of gas cylinders shall be not less than that calculated using the
formula:
b = a × C
1
where
10

---------------------- Page: 12 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
a is the value of a calculated in accordance with 5.2 using J = 1,0;
1
C is a shape factor, whose value shall be obtained from the graphs given in Figures 2 and 3.

a) Torispherical      b) Ellipsoidal
Figure 1 — Illustration of cylinder ends
11

---------------------- Page: 13 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)

Figure 2 — Values of shape factor C for H/D between 0,2 and 0,25

Figure 3 — Values of shape factor C for H/D between 0,25 and 0,5
5.4 Minimum wall thickness
5.4.1 The minimum wall thickness of the cylindrical shell a and end b shall be not less than the value
derived from the appropriate one of the following formulae:
for D ≤ 100 mm, a = b = 1,1 mm;
for 100 mm < D ≤ 150 mm, a = b = 1,1 + 0,008(D - 100) mm;
D
for D > 150 mm, a = b = + 0,7 mm, with an absolute minimum of 1,5 mm.
250
12

---------------------- Page: 14 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
These formulae apply to cylindrical shells and ends irrespective of whether they are designed by
calculation under 5.2 and 5.3 or by the pressure cycling test in 7.3.2.
5.4.2 Apart from the requirements of 5.3, 5.4 and 5.5 any cylindrical part integral with an end shall,
except as qualified by 5.4.3, also satisfy the requirements given in 5.2 for the cylindrical shell.
5.4.3 Where the length of the cylindrical portion of the gas cylinder, measured between the beginning
of the domed parts of the two ends, is not more than 2bD , the wall thickness shall be not less than that
of the domed part (see 5.3.2).
NOTE For certain gases, additional corrosion allowance can be applicable.
5.5 Ends of other shapes
Ends of shapes other than those covered by 5.3 may be used provided that the adequacy of their design
is demonstrated by a pressure cycling test in accordance with 7.3.2 or by stress analysis.
5.6 Design of openings
5.6.1 The location of all openings shall be restricted to the end(s) of cylinders.
5.6.2 Each opening in the cylinder shall be reinforced, either by a valve boss or pad, of weldable and
compatible steel, securely attached by welding and so designed as to be of adequate strength and to result
in no harmful stress concentrations. This shall be confirmed by design calculations or a pressure cycling
test in accordance with 7.3.2.
5.6.3 The welds of the openings shall be separated from longitudinal and circumferential joints by a
distance not less than 3a.
6 Construction and workmanship
6.1 General
The cylinder or cylinder parts shall be produced by:
— using seamless or longitudinally welded tube with forged ends being circumferentially welded; or
— using longitudinally welded tube with spun ends; or
— using a seamless tube, followed by hot forming where the base is sealed with added weld metal; or
— using cold worked tube or plates; or
— using deep drawn parts; or
— using high frequency induction welded tube with welded ends.
6.2 Welding procedures
Each manufacturer, before proceeding with the production of a given design of cylinder, shall qualify all
welding procedures to EN ISO 15607, EN ISO 15614-1 and EN ISO 15609-1 and welders to EN ISO 9606-
1. Records of such qualification shall be kept on file by the manufacturer.
6.3 Welded joints of pressure containing parts
6.3.1 The welding of longitudinal and circumferential seams shall be by an automatic process. Manual
welding is however permitted for boss welds except when they are butt welds.
13

---------------------- Page: 15 ----------------------
oSIST prEN 13322-1:2021
prEN 13322-1:2021 (E)
6.3.2 The longitudinal joint, of which there shall be no more than one, shall be butt-welded.
6.3.3 Circumferential joints, of which there shall be no more than two, excluding end bungs, shall be
butt-welded, joggle welded, or butt welded with a backing ring.
6.3.4 For acetylene service, the joints shall be designed in such a way as to eliminate the risk of
damaging the porous mass.
6.4 Non-pressure-containing attachments
6.4.1 Parts which
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.