ISO 4706:2023
Gas cylinders — Refillable welded steel cylinders — Test pressure 60 bar and below
This document 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[1], exposed to extreme worldwide temperatures (−50 °C to +65 °C) used for compressed, liquefied or dissolved gases.
NOTE Unless specified in the text, for the purpose of this document, the word “cylinder” includes “pressure drums”.
This document is primarily intended to be used for industrial gases other than liquefied petroleum gas (LPG), and is also applicable to LPG.
[1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
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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
5.2 Chemical composition
6 Design
6.1 General requirements
6.2 Valve protection
6.3 Design of openings
7 Calculation of minimum wall thickness (sidewall and ends)
7.1 Sidewall thickness
7.2 Design of ends concave to pressure
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
8.4 Tolerances
8.4.1 Out of roundness
8.4.2 Straightness
8.4.3 Verticality
8.5 Non-pressure-containing attachments
8.6 Valve protection
8.7 Closure of openings
8.8 Heat treatment
9 Testing
9.1 Mechanical testing
9.1.1 General requirements
9.1.2 Types of test and evaluation of test results
9.2 Burst test under hydraulic pressure
9.2.1 Test conditions
9.2.2 Interpretation of test
9.2.3 Volumetric expansion
9.3 Pressure test
9.4 Radiographic and macro examination
9.4.1 Radiographic examination
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
10 Acceptance criteria
11 Type approval
12 Batch tests
12.1 Inspection lots
12.2 Rate of sampling
12.3 Quantity ≤ 3 000 cylinders water capacity less than or equal to 35 l
12.4 Quantity over 3 001 cylinders water capacity greater than 35 l
12.5 Failure to meet batch test requirements
13 Test/examinations for all pressure cylinders
14 Markings
15 Certificate
Annex A (informative) New design type approval certificate
Annex B (informative) Acceptance certificate
Bibliography
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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
5.2 Chemical composition
6 Design
6.1 General requirements
6.2 Valve protection
6.3 Design of openings
7 Calculation of minimum wall thickness (sidewall and ends)
7.1 Sidewall thickness
7.2 Design of ends concave to pressure
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
8.4 Tolerances
8.4.1 Out of roundness
8.4.2 Straightness
8.4.3 Verticality
8.5 Non-pressure-containing attachments
8.6 Valve protection
8.7 Closure of openings
8.8 Heat treatment
9 Testing
9.1 Mechanical testing
9.1.1 General requirements
9.1.2 Types of test and evaluation of test results
9.2 Burst test under hydraulic pressure
9.2.1 Test conditions
9.2.2 Interpretation of test
9.2.3 Volumetric expansion
9.3 Pressure test
9.4 Radiographic and macro examination
9.4.1 Radiographic examination
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
10 Acceptance criteria
11 Type approval
12 Batch tests
12.1 Inspection lots
12.2 Rate of sampling
12.3 Quantity ≤ 3 000 cylinders water capacity less than or equal to 35 l
12.4 Quantity over 3 001 cylinders water capacity greater than 35 l
12.5 Failure to meet batch test requirements
13 Test/examinations for all pressure cylinders
14 Markings
15 Certificate
Annex A (informative) New design type approval certificate
Annex B (informative) Acceptance certificate
Bibliography