SIST EN 13322-1:2003
(Main)Transportable gas cylinders - Refillable welded steel gas cylinders - Design and construction - Part 1: Carbon steel
Transportable gas cylinders - Refillable welded steel gas cylinders - Design and construction - Part 1: Carbon steel
This European Standard gives minimum requirements for certain aspects concerning material, design, construction and workmanship, procedure and test at manufacture of refillable welded steel gas cylinders of water capacities from 0,5 l up to and including 150 l for compressed, liquefied or dissolved gases. For acetylene service, additional requirements for the cylinder and the basic requirements for the porous mass.
Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Flaschen aus Stahl - Gestaltung und Konstruktion - Teil 1: Flaschen aus Kohlenstoffstahl
Die vorliegende Europäische Norm legt Mindestanforderungen an Werkstoffe, Konstruktion und fachgerechte Ausführungsweise, Herstellungsverfahren und Prüfung ortsbeweglicher, wiederbefüllbarer, geschweißter Gasflaschen aus Stahl mit einem Fassungsraum von 0,5 l bis einschließlich 150 l für verdichtete, verflüssigte und unter Druck gelöste Gase fest. Für den Acetylenbetrieb sind zusätzliche Anforderungen an die Flaschen und grundlegende Anforderungen an die porösen Massen enthalten.
Bouteilles a gaz transportables - Bouteilles a gaz rechargeables soudées en acier - Conception et construction - Partie 1: Acier au carbone
La présente norme européenne 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 a gaz transportables et rechargeables en acier au carbone soudées ayant une capacité en eau comprise entre 0,5 l et 150 l inclus, destinées a transporter des gaz comprimés, liquéfiés et dissous.
Les bouteilles destinées a recevoir de l'acétylene sont soumises a des exigences supplémentaires et les exigences de base concernant les masses poreuses sont indiquées dans la norme EN 1800. Pour les bouteilles faites de tubes d'acier soudés par induction a haute fréquence, les exigences sont indiquées dans l'annexe A.
La présente norme est principalement destinée aux gaz industriels autres que le GPL, mais peut également etre appliquée au GPL. Cependant, pour les bouteilles a gaz dédiées au GPL, voir l'EN 1442, Bouteilles en acier soudé transportables et rechargeables pour gaz de pétrole liquéfiés (GPL) - Conception et fabrication préparée par le CEN/TC 286, Equipement et accessoires pour gaz de pétrole liquéfiés.
Premične plinske jeklenke - Ponovno polnljive jeklenke - Načrtovanje in izdelava - 1. del: Jeklenke iz ogljičnega jekla
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13322-1:2003
01-december-2003
3UHPLþQHSOLQVNHMHNOHQNH3RQRYQRSROQOMLYHMHNOHQNH1DþUWRYDQMHLQL]GHODYD
GHO -HNOHQNHL]RJOMLþQHJDMHNOD
Transportable gas cylinders - Refillable welded steel gas cylinders - Design and
construction - Part 1: Carbon steel
Ortsbewegliche Gasflaschen - Wiederbefüllbare geschweißte Flaschen aus Stahl -
Gestaltung und Konstruktion - 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: EN 13322-1:2003
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
SIST EN 13322-1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13322-1:2003
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SIST EN 13322-1:2003
EUROPEAN STANDARD
EN 13322-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2003
ICS 23.020.30
English version
Transportable gas cylinders - Refillable welded steel gas
cylinders - Design and construction - Part 1: Carbon steel
Bouteilles à gaz transportables - Bouteilles à gaz Ortsbewegliche Gasflaschen - Wiederbefüllbare
rechargeables soudées en acier - Conception et geschweißte Flaschen aus Stahl - Gestaltung und
construction - Partie 1: Acier au carbone Konstruktion - Teil 1: Flaschen aus Kohlenstoffstahl
This European Standard was approved by CEN on 28 November 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13322-1:2003 E
worldwide for CEN national Members.
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SIST EN 13322-1:2003
EN 13322-1:2003 (E)
Contents
page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms, definitions and symbols.6
4 Materials and heat treatment .8
5 Design .8
6 Construction and workmanship.12
7 New design tests.15
8 Batch tests.17
9 Tests on every cylinder .25
10 Failure to meet test requirements .25
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
Annex E (informative) Guidance on the application of conformity assessment modules when using
this standard.42
Bibliography .47
2
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SIST EN 13322-1:2003
EN 13322-1:2003 (E)
Foreword
This document (EN 13322-1:2003) has been prepared by Technical Committee CEN/TC 23 "Transportable gas
cylinders", the secretariat of which is held by BSI.
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 September 2003, and conflicting national standards shall be withdrawn at the
latest by September 2003.
This European Standard has been submitted for reference into the RID and/or in the technical annexes of the ADR.
Therefore in this context the standards listed in the normative references and covering basic requirements of the
RID/ADR not addressed within the present standard are normative only when the standards themselves are
referred to in the RID and/or in the technical annexes of the ADR.
For relationships with EC directives, RID and ADR see informative annex E, which is an integral part of this
document.
This standard is one of a series of two standards concerning refillable welded steel gas cylinders of water
capacities from 0,5 l 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. Annexes D and E are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom.
3
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SIST EN 13322-1:2003
EN 13322-1:2003 (E)
Introduction
The purpose of this European Standard 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 standard 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.
4
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SIST EN 13322-1:2003
EN 13322-1:2003 (E)
1 Scope
This European Standard specifies minimum requirements concerning material, design, construction and
workmanship, manufacturing processes and testing of refillable transportable welded carbon steel gas cylinders of
water capacities from 0,5 l up to and including 150 l for compressed, liquefied and dissolved gases.
For acetylene service, additional requirements for the cylinder and the basic requirements for the porous mass are
given in EN 1800. For those cylinders made from high frequency induction (HFI) welded steel tubes, the
requirements are given in annex A.
This standard is primarily for industrial gases other than LPG but may 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
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and publications are listed hereafter. For dated
references, subsequent amendments to or revisions of any of these publications apply to this European Standard
only when incorporated in it by amendment or revision. For undated references the latest edition of the publication
referred to applies (including amendments).
EN 287-1, Approval testing of welders - Fusion welding - Part 1: Steels.
EN 288-1, Specification and qualification of welding procedures for metallic materials - Part 1: General rules for
fusion welding.
EN 288-3, Specification and approval of welding procedures for metallic materials - Part 3: Welding procedure tests
for the arc welding of steels.
EN 473, Non destructive testing - Qualification and certification of NDT personnel - General principles.
EN 962, Transportable gas cylinders - Valve protection caps and valve guards for industrial and medical gas
cylinders - Design, construction and tests.
EN 970, Non-destructive examination of fusion welds - Visual examination.
EN 1089-1, Transportable gas cylinders - Gas cylinder identification (excluding LPG) - Part 1: Stampmarking.
EN 1435, Non-destructive examination of welds - Radiographic examination of welded joints.
EN 1442, Transportable refillable welded steel cylinders for liquefied petroleum gas (LPG) - Design and
construction.
EN 1964-1:1999, Transportable gas cylinders - Specification for the design and construction of refillable
transportable seamless steel gas cylinders of water capacities from 0,5 litre up to and including 150 litres - Part 1:
Cylinders made of seamless steel with an R value of less than 1100 MPa.
m
EN 10002-1, Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature.
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.
5
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EN 13322-1:2003 (E)
EN 10045-1, Metallic materials - Charpy impact test - Part 1: Test method.
EN 10083-1 + A1, Quenched and tempered steels - Part 1: Technical delivery conditions for special steels
(includes amendment A1:1996)
EN 10120, Steel sheet and strip for welded gas cylinders.
EN 10208-2, Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 2: Pipes of
requirement class B.
EN 12517, Non-destructive examination of welds - Radiographic examination of welded joints - Acceptance levels.
EN 13445-2, Unfired pressure vessels - Part 2: Materials.
EN 25817, Arc-welded joints in steel - Guidance on quality levels for imperfections (ISO 5817:1992).
EN ISO 11114-1, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents -
Part 1: Metallic materials (ISO 11114-1:1997).
ISO 2504:1973, Radiography of welds and vewing conditions for films - Utilization of recommended patterns of
image quality indicators (I.Q.I.).
3 Terms, definitions and symbols
For the purpose of this standard, the following terms, definitions and symbols apply.
3.1 Terms and definitions
3.1.1
yield stress
value corresponding to the lower yield stress, R , or 0,92 · the upper yield stress (R ) or for steels that do not
eL eH
exhibit a defined yield, the 0,2 % proof stress (R )
p0,2
[EN 10002-1]
3.1.2
normalizing
heat treatment in which a cylinder is heated to a uniform temperature above the upper critical point (AC , as
3
defined in EN 10052) of the steel and then cooled in a controlled atmosphere
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
1
defined in EN 10052) of the steel and cooling in a still atmosphere
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 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 stress (R )
h e
6
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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
1)
p Hydraulic test pressure, in bar , above atmospheric pressure
h
r Inside radius of knuckle end, in millimetres (see Figure 1)
R Inside radius of the dished end, in millimetres (see Figure 1)
R Yield stress, in megapascals, as defined in 3.1.1 and used for design calculation
e
R Value of the actual yield stress in megapascals determined by the tensile test
ea
R Minimum value of the upper yield stress, in megapascals, guaranteed by the cylinder manufacturer for the
eH
finished cylinder, in accordance with EN 10002-1
R Minimum value of the lower yield stress, in megapascals, guaranteed by the cylinder manufacturer for the
eL
finished cylinder, in accordance with EN 10002-1
R Minimum value of tensile strength, in megapascals, guaranteed by the cylinder manufacturer for the finished
g
cylinder
R Actual value of tensile strength, in megapascals, determined by the tensile test (see 8.4)
m
5
1 1 bar = 10 Pa = 0,1 MPa
7
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EN 13322-1:2003 (E)
S Original cross-sectional area of tensile test piece, in square millimetres, according to EN 10002-1
o
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 bungs shall conform to EN 10083-1 + A1.
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.
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 stress of the parent
material.
5.1.2 For calculation purposes, the value of the yield stress R 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.
8
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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
Łł
0,65
where the value of F is the lesser of or 0,77.
(Re/Rg )
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
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.
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EN 13322-1:2003 (E)
a) Torispherical b) Ellipsoidal
Figure 1 — Illustration of cylinder ends
10
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EN 13322-1:2003 (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
11
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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
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
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EN 13322-1:2003 (E)
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 288-1 and EN 288-3 and welders to EN 287-1. 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.
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 are not submitted to pressure such as footrings, handles and neckrings shall be made of steel
compatible with that of the cylinder.
Each attachment shall be designed to permit inspection of the attachment welds, shall be clear of
6.4.2
longitudinal and circumferential joints, and so designed as to avoid trapping water.
6.4.3 A footring or other support shall be fitted to the cylinder when required to provide stability, and attached so
as to permit inspection of the bottom circumferential weld. Permanently attached footrings shall be drained and the
space enclosed by the footring shall be ventilated.
6.5 Valve protection
6.5.1 Valves of cylinders of more than 5 l water capacity shall be protected from damage which could cause
release of gas, either by the design of the cylinder (e.g. protective shroud) or by a valve protection device (in
accordance with EN 962).
6.5.2 When a protective shroud is used, it shall fulfil the requirements of the drop test described in EN 962.
6.5.3 The requirements of 6.5.1 and 6.5.2 may be waived when the cylinders are intended to be conveyed in
bundles or cradles, or when some other effective valve protection is provided.
6.6 Neck threads
The internal neck threads shall conform to a recognized standard to permit the use of a corresponding valve thus
minimizing neck stresses following the valve torquing operation. Internal neck threads shall be checked using
gauges corresponding to the agreed neck thread, or by an alternative method. Particular care shall be taken to
ensure that neck threads are accurately cut, are of full form and free from any sharp profiles, e.g. burrs.
NOTE For example, where the neck thread is specified to be in accordance with EN 629-1, the corresponding gauges are
specified in EN 629-2.
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6.7 Visual examination
6.7.1 Unacceptable defects
Before assembly, the pressure containing parts of the cylinders shall be examined for uniform quality and freedom
from unacceptable defects, examples of which are given in annex C.
6.7.2 Welds
6.7.2.1 Before the cylinders are closed, longitudinal welds shall be visually examined from both sides.
Permanent backing strips shall not be used with longitudinal welds.
6.7.2.2 All welds shall have a smooth finish without concavity and shall merge into the parent material without
under-cutting or abrupt irregularity.
6.7.2.3 Butt welds shall have full penetration. For joggle welds, the penetration shall be full on the straight
edge and shall be sufficient on the swaged edge (see Figure 4).
6.7.2.4 Radiographic examination, radioscopic examination, or NDT examination carried out using another
suitable method, shall be as specified in annex B.
Dimensions in millimetres
Butt Welds Joggle welds
Figure 4 — Illustration of welding penetration
6.7.3 Out of roundness
The out-of-roundness of the cylindrical shell shall be limited so that the difference between the maximum and the
minimum outside diameter in the same cross-section is not more than 2 % of the mean of these diameters.
6.7.4 Straightness
Unless otherwise specified on the manufacturing drawing, the maximum deviation of the cylindrical part of the shell
from a straight line shall not exceed 0,3 % of the cylindrical length.
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6.7.5 Verticality
When the cylinder is standing on its base, the cylindrical shell and concentric top opening shall be vertical to within
1 % of the cylindrical length.
6.7.6 Tightness
Tests appropriate to the manufacturing process shall be carried out to ensure that there is no leakage from the
cylinder.
7 New design tests
7.1 General requirements
7.1.1 Testing shall be carried out for each new design of cylinder.
A cylinder shall be considered to be of a new design compared with an existing design when:
it is manufactured in a different factory; or
it is manufactured by a different welding process or a radical change in an existing process, e.g. change of
type of heat treatment; or
it is manufactured from a steel of different specified chemical composition range; or
it is given a different heat treatment outside the ranges stipulated in 4.2; or
if there is a change in base profile, e.g. concave, convex, hemispherical, or there is a change in the base
thickness/cylinder diameter ratio; or
the guaranteed minimum yield stress (R ) or guaranteed minimum tensile strength (R ) has changed; or
e g
the overall length of the cylinder has increased by more than 50 % (cylinders with a length/diameter ratio less
than 3 shall not be used as reference cylinders for any new design with this ratio greater than 3); or
the nominal outside diameter has changed; or
the guaranteed minimum wall thickness (a') or the guaranteed minimum end thickness (b') has been
decreased; or
the hydraulic test pressure has been changed (where a cylinder is used for a lower pressure duty than that for
which the cylinder was approved, it shall not be deemed a new design).
7.1.2 A technical specification of the cylinder, including design drawing, design calculations, material details,
welding and manufacturing process and heat treatment, shall be prepared by the manufacturer and attached to the
design test certificate (see annex D).
7.1.3 A minimu
...
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