ISO 20703:2006
(Main)Gas cylinders — Refillable welded aluminium-alloy cylinders — Design, construction and testing
Gas cylinders — Refillable welded aluminium-alloy cylinders — Design, construction and testing
ISO 20703:2006 specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes and tests at manufacture of refillable, transportable, welded aluminium-alloy gas cylinders of water capacities from 0,5 l up to and including 150 l, and of a test pressure not greater than 60 bar (6 MPa) for compressed, liquefied and dissolved gases. It includes requirements for spherical receptacles and cylinders made from seamless bodies with welded non-pressure-bearing attachments such as shrouds and foot-rings.
Bouteilles à gaz — Bouteilles rechargeables soudées en alliage d'aluminium — Conception, construction et essais
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20703
First edition
2006-05-01
Gas cylinders — Refillable welded
aluminium-alloy cylinders — Design,
construction and testing
Bouteilles à gaz — Bouteilles rechargeables soudées en alliage
d'aluminium — Conception, construction et essais
Reference number
©
ISO 2006
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© ISO 2006
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ii © ISO 2006 – All rights reserved
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 2
3.1 Terms and definitions. 2
3.2 Symbols . 2
4 Materials . 4
4.1 General provisions . 4
4.2 Heat treatment. 4
4.3 Gas/material compatibility . 5
5 Design . 5
5.1 General provisions . 5
5.2 Calculation of wall thickness. 7
5.3 Design of convex ends (heads and bases) . 8
5.4 Neck design. 12
5.5 Foot-rings . 12
5.6 Neck-rings . 12
5.7 Shroud . 12
5.8 Design drawing . 12
6 Construction and workmanship. 12
6.1 Seamless bodies. 12
6.2 Welding . 12
6.3 Non-destructive examination of welds. 13
6.4 Surface defects . 13
6.5 Neck threads . 13
6.6 Out-of-roundness. 14
6.7 Straightness . 14
6.8 Eccentricity. 14
6.9 Stability . 14
7 Tests and examinations . 14
7.1 General. 14
7.2 Mechanical tests . 14
7.3 Hydraulic burst test . 21
7.4 Pressure-cycling test. 23
7.5 Hydraulic test . 24
7.6 Check on the homogeneity of a batch. 24
7.7 Leakage test . 24
7.8 Capacity check. 24
7.9 Examination for neck folds. 24
8 Conformity evaluation. 25
9 Identification marks. 25
10 Records. 25
Annex A (normative) Corrosion tests . 26
Annex B (normative) New design type testing and production testing . 40
Annex C (normative) Description, evaluation of manufacturing defects and conditions for
rejection of welded aluminium-alloy gas cylinders at time of visual inspection . 44
Annex D (informative) Examples of new design type approval and production test certificates . 48
Bibliography . 54
iv © ISO 2006 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20703 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3, Cylinder
design.
This International Standard has been prepared to address the general requirements in Section 6.2.1 of the UN
model regulations for the transportation of dangerous goods ST/SG/AC.10/1/Rev.13. It is intended to be used
under a variety of regulatory regimes but has been written so that it is suitable for use with the conformity
assessment system in paragraph 6.2.2.5 of the above mentioned model regulations.
Introduction
The purpose of this International Standard is to provide a specification for the design, manufacture, inspection and
approval of refillable, transportable, welded aluminium-alloy 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 participating members.
vi © ISO 2006 – All rights reserved
INTERNATIONAL STANDARD ISO 20703:2006(E)
Gas cylinders — Refillable welded aluminium-alloy cylinders —
Design, construction and testing
1 Scope
This International Standard specifies minimum requirements for the material, design, construction and
workmanship, manufacturing processes and tests at manufacture of refillable, transportable, welded
aluminium-alloy gas cylinders of water capacities from 0,5 l up to and including 150 l, and of a test pressure
not greater than 60 bar (6 MPa) for compressed, liquefied and dissolved gases.
This International Standard includes requirements for spherical receptacles and cylinders made from
seamless bodies with welded non-pressure-bearing attachments such as shrouds and foot-rings.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 2107, Aluminium and aluminium alloys — Wrought products — Temper designations
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 7438, Metallic materials — Bend test
ISO 7866:1999, Gas cylinders — Refillable seamless aluminium alloy gas cylinders — Design, construction
and testing
ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
ISO 10042:2005, Welding — Arc-welded joints in aluminium and its alloys — Quality levels for imperfections
ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 1: Metallic materials
ISO 11117, Gas cylinders — Valve protection caps and valve guards for industrial and medical gas
cylinders — Design, construction and tests
ISO 13341, Transportable gas cylinders — Fitting of valves to gas cylinders
ISO 13769, Gas cylinders — Stamp marking
ISO 15614-2:2005, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 2: Arc welding of aluminium and its alloys
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document the following terms and definitions apply.
3.1.1
yield stress
value corresponding to the 0,2 % proof stress (non proportional elongation), R
p0,2
3.1.2
solution heat treatment
thermal treatment which consists of heating the products to a suitable temperature, holding at that
temperature long enough to allow constituents to enter into solid solution, and cooling rapidly enough to hold
the constituents in solution
3.1.3
quenching
controlled rapid cooling in a suitable medium to retain the solute phase in solid solution
3.1.4
artificial ageing
heat treatment process in which
...
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