ISO 22991:2004
(Main)Gas cylinders — Transportable refillable welded steel cylinders for liquefied petroleum gas (LPG) — Design and construction
Gas cylinders — Transportable refillable welded steel cylinders for liquefied petroleum gas (LPG) — Design and construction
ISO 22991:2004 specifies minimum requirements concerning material, design, construction and workmanship, procedure and test at manufacture of transportable refillable welded steel liquefied petroleum gas (LPG) cylinders of water capacity up to and including 150 l, exposed to ambient temperatures.
Bouteilles à gaz — Bouteilles en acier soudé transportables et rechargeables pour gaz de pétrole liquéfié (GPL) — Conception et fabrication
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22991
First edition
2004-05-01
Gas cylinders — Transportable refillable
welded steel cylinders for liquefied
petroleum gas (LPG) — Design and
construction
Bouteilles à gaz — Bouteilles en acier soudé transportables et
rechargeables pour gaz de pétrole liquéfié (GPL) — Conception et
fabrication
Reference number
©
ISO 2004
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ii © ISO 2004 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Symbols . 3
5 Materials. 3
6 Design . 4
6.1 General requirements . 4
6.2 Calculation of cylindrical shell thickness. 5
6.3 Design of ends concave to pressure . 5
6.4 Ends of other shapes. 9
6.5 Minimum wall thickness. 9
6.6 Design of openings. 9
6.7 Valve protection . 9
7 Construction and workmanship . 10
7.1 Welding qualification . 10
7.2 Plates and pressed parts. 10
7.3 Welded joints. 10
7.4 Tolerances . 10
7.5 Non-pressure-containing attachments.11
7.6 Valve protection . 11
7.7 Closure of openings . 11
7.8 Heat treatment . 11
8 Testing. 12
8.1 Mechanical testing . 12
8.2 Burst test under hydraulic pressure . 17
8.3 Pressure test . 18
8.4 Radiographic and macro examination.18
8.5 Visual examination of the surface of the weld. 20
8.6 Pressure cycling (fatigue) test. 20
9 Acceptance procedure . 21
9.1 General. 21
9.2 Batch testing . 21
9.3 Failure to meet batch test requirements. 23
10 Technical requirements for type approval . 23
11 Marking. 24
12 Certification . 24
Annex A (normative) Manufacturer's marking . 25
Annex B (informative) Examples of type approval and production test certificates. 26
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 22991 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3, Cylinder
design.
iv © ISO 2004 – All rights reserved
Introduction
This International Standard calls for the use of substances and procedures that may be injurious to health if
adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from
legal obligations relating to health and safety at any stage. It has been assumed in the drafting of this
International Standard, that the execution of its provisions is entrusted to appropriately qualified and
experienced people.
INTERNATIONAL STANDARD ISO 22991:2004(E)
Gas cylinders — Transportable refillable welded steel cylinders
for liquefied petroleum gas (LPG) — Design and construction
1 Scope
This International Standard specifies minimum requirements concerning material, design, construction and
workmanship, procedure and test at manufacture of transportable refillable welded steel liquefied petroleum
gas (LPG) cylinders of water capacity up to and including 150 l, exposed to ambient temperatures.
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 643, Steels — Micrographic determination of the apparent grain size
ISO 1106-1:1984, Recommended practice for radiographic examination of fusion welded joints — Part 1:
Fusion welded butt joints in steel plates up to 50 mm thick
ISO 1106-3:1984, Recommended practice for radiographic examination of fusion welded joints — Part 3:
Fusion welded circumferential joints in steel pipes of up to 50 mm wall thickness
ISO 2504:1973, Radiography of welds and viewing conditions for films — Utilization of the recommended
patterns of image quality indications (I.Q.I.)
ISO 4136, Destructive tests on welds in metallic materials — Transverse tensile test
ISO 4978, Flat rolled steel products for welded gas cylinders
ISO 5178, Destructive tests on welds in metallic materials — Longitudinal tensile test on weld metal in fusion
welded joints
ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) — Quality levels for imperfections
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 7438, Metallic materials — Bend test
ISO 9606-1, Approval testing of welders — Fusion Welding — Part 1: Steels
ISO 9956-3, Specification and approval of welding procedures for metallic materials — Part 3: Welding
procedure tests for arc welding of steels
ISO 10920, Gas cylinders — 25E taper thread for connection of valves to gas cylinders — Specification
ISO 11116-1, Gas cylinders — 17E taper thread for connection of valves to gas cylinders — Part 1:
Specifications
ISO 13769, Gas cylinders — Stamp marking
ISO 14732, Welding personnel — Approval testing of welding operators for fusion welding and of resistance
weld setters for fully mechanized and automatic welding of metallic materials
ISO 17637, Non-destructive testing of welds — Visual testing of fusion-welded joints
ISO 17639, Destructive tests on welds in metallic materials — Macroscopic and microscopic examination of
welds
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
yield stress
upper yield strength, R , or, for steels that do not exhibit a defined yield, the 0,2 % proof stress (non-
eh
proportional elongation), R
p
[ISO 6892]
3.2
normalizing
heat treatment in which the cylinder is heated to a uniform temperature above the upper critical point (AC ) of
the steel and then cooled in a controlled atmosphere or still air
3.3
stress relieving
heat treatment given to the 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 ) of
the steel and cooling in a controlled atmosphere or still air
3.4
competent body
person or corporate body who, by combination of appropriate qualifications, training, experience and
resources, is able to make objective judgements on the subject
2 © ISO 2004 – All rights reserved
4 Symbols
Table 1 — Symbols and their designations and units
Symbol Designation Unit
a calculated minimum thickness of the cylindrical shell mm
A percentage elongation after fracture %
b calculated minimum thickness of the end of the cylinder mm
C
shape factor (see Table 3 and Figure 2) 1
D outside diameter of the cylinder as given in the design drawing (see Figure 1) mm
D mm
outside diameter of a bend tests former (see Figure 10)
p
h height of the cylindrical part of the end (see Figure 1) mm
H outside height of the domed part of the end (see Figure 1) mm
J stress reduction factor 1
L
length of the cylinder mm
L mm
original gauge length of the test piece in accordance with ISO 6892
o
n ratio of diameter of bend test former to the thickness of the test piece (see Table 4) 1
calculation pressure used
...
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