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AS/NZS ISO 4706:2025
[Current]AS/NZS ISO 4706:2025 identically adopts ISO 4706:2023, which specifies the minimum requirements concerning material selection, 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 and drums of water capacities of 150 l to 500 l of a test pressure not greater than 60 bar, exposed to extreme worldwide temperatures (−50 °C to +65 °C) used for compressed, liquefied or dissolved gases
Published: 28/02/2025
Pages: 32
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Inspection and testing
5 Materials
5.1 General
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.1.8
5.2 Chemical composition
5.2.1
5.2.2
6 Design
6.1 General requirements
6.1.1
6.1.2
6.1.3
6.1.4
6.2 Valve protection
6.3 Design of openings
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
7 Calculation of minimum wall thickness (sidewall and ends)
7.1 Sidewall thickness
7.2 Design of ends concave to pressure
7.2.1
7.2.2
7.2.3
8 Construction and workmanship
8.1 Welding qualification
8.1.1 General
8.1.2 Base materials (pressure and non-pressure)
8.1.3 Positions of welds
8.1.4 Welding materials
8.1.5 Retesting
8.1.6 Period of effectiveness
8.1.7 Changes to welding process requiring recertification
8.1.8 Welder qualification tests
8.1.9 Results of welder qualification
8.2 Plates and pressed parts
8.3 Welded joints
8.3.1
8.3.2
8.3.3
8.3.4
8.3.5
8.3.6
8.3.7
8.3.8
8.3.9
8.3.10
8.4 Tolerances
8.4.1 Out of roundness
8.4.2 Straightness
8.4.3 Verticality
8.5 Non-pressure-containing attachments
8.5.1
8.5.2
8.5.3
8.5.4
8.6 Valve protection
8.7 Closure of openings
8.8 Heat treatment
8.8.1
8.8.2
8.8.3
9 Testing
9.1 Mechanical testing
9.1.1 General requirements
9.1.1.1
9.1.1.2
9.1.2 Types of test and evaluation of test results
9.1.2.1 Sample cylinder tests
9.1.2.2 Tensile test
9.1.2.2.1 Tensile test on parent metal
9.1.2.2.1.1
9.1.2.2.1.2
9.1.2.2.2 Weld tensile tests
9.1.2.2.2.1
9.1.2.2.2.2
9.1.2.3 Bend test
9.1.2.3.1
9.1.2.3.2
9.1.2.3.3
9.2 Burst test under hydraulic pressure
9.2.1 Test conditions
9.2.1.1
9.2.1.2
9.2.2 Interpretation of test
9.2.3 Volumetric expansion
9.2.3.1 Type of fracture
9.3 Pressure test
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
9.3.7
9.3.8
9.4 Radiographic and macro examination
9.4.1 Radiographic examination
9.4.1.1
9.4.1.2
9.4.1.3
9.4.1.4
9.4.1.5
9.4.2 Macro examination
9.4.3 Examination of flange welding
9.4.4 Examination of welding of non-pressure containing attachments
9.4.5 Unacceptable imperfections at radiographic or macro examination
9.5 Visual examination of the surface of the weld
9.5.1
9.5.2
10 Acceptance criteria
10.1
10.2
10.3
10.4
10.5
11 Type approval
11.1
11.2
11.3
11.3.1
11.3.2
11.3.3
11.3.4
12 Batch tests
12.1 Inspection lots
12.2 Rate of sampling
12.2.1
12.2.2
12.2.3
12.2.4
12.3 Quantity ≤ 3 000 cylinders water capacity less than or equal to 35 l
12.3.1
12.3.2
12.4 Quantity over 3 001 cylinders water capacity greater than 35 l
12.4.1
12.4.2
12.5 Failure to meet batch test requirements
12.5.1
12.5.2
12.5.3
12.5.3.1
12.5.3.2
13 Test/examinations for all pressure cylinders
13.1
13.2
14 Markings
14.1
14.2
14.3
15 Certificate
Annex A
Annex B
Bibliography
Cited references in this standard
[Current]
Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections
[Current]
Metallic materials - Tensile testing - Part 1: Method of test at room temperature