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AS/NZS ISO 21172.1:2025
$213.50
Gas cylinders – Welded steel pressure drums up to 3 000 litres capacity for the transport of gases – Design and construction, Part 1: Capacities up to 1 000 litres
AS/NZS ISO 21172.1:2025 identically adopts ISO 21172-1:2015, which specifies the minimum requirements for the material, design, fabrication, construction and workmanship, inspection, and testing at manufacture of refillable welded steel gas pressure drums of volumes 150 l to 1 000 l and up to 300 bar test pressure for compressed and liquefied gases
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Inspection and testing
5 Materials
5.1 General provisions
5.1.1 Materials for the pressure envelope
5.1.2 The materials used for the drum
5.1.3 All parts welded to the drum
5.1.4 Welding consumables
5.1.5 Conformance
5.2 Heat treatment
6 Design
6.1 Design stress
6.2 Design temperature
6.3 Calculation of thickness
6.3.1 Cylindrical wall
6.3.2 Spherical shell
6.3.3 Dished ends
6.3.3.1 Types of dished end
6.3.3.2 Shape factor
6.3.3.3 Limitations of shape
6.3.3.4 Dished ends convex to pressure
6.4 Minimum thickness for handling
6.5 Fittings
6.5.1 General
6.5.2 Screwed fittings
6.5.2.1
6.5.2.2
6.5.3 Bolted connections
6.5.4 Protection of fittings
6.5.4.1 General
6.5.4.2 End shrouds
6.5.4.3 Frame protection
6.5.5 Fittings and valves protection
6.5.5.1
6.5.5.2
6.5.5.3
6.5.5.5
6.5.6 Compensation of openings
6.5.6.1
6.5.6.2
6.5.6.3
7 Lifting attachments and rolling bands
7.1 Vertical and spherical drums
7.1.1
7.1.2
7.2 Horizontal drums
7.3 Rolling bands
8 Manufacturing process — Welding procedures
9 Fabrication
9.1 Shell sections
9.2 Dished ends
9.3 Cold pressed dished ends
9.4 Hot pressed dished ends
10 Welded joints
11 Surface finish of material
12 Assembly
12.1 Temporary attachments
12.2 Alignment of joints
12.3 Attachments and fittings
13 Weld defect repairs
14 Construction and workmanship
14.1 Thickness measurement
14.2 Out of roundness
14.3 Straightness
15 Testing and examination
15.1 Test plates
15.2 Provision of welded test plates
15.2.1
15.2.2
15.2.3
15.2.4
15.2.5
15.2.6
15.3 Number of test specimens
15.4 Mechanical tests
15.4.1 Tensile tests
15.4.2 Bend tests
15.4.3 Impact test
15.4.3.1
15.4.3.2
15.4.3.3
15.4.3.4
15.4.3.5
15.4.4 Macro examination
15.5 Non-destructive examination of completed welds
15.5.1 General
15.5.2 Radiography/radioscopy
15.5.3 Rejection criteria
15.6 Failure to meet test requirements
15.7 Lifting points
16 Type approval procedure
16.1 General requirements
16.2 Type approval tests
16.2.1 Prototype tests
16.2.1.1 Pressure cycling test
16.2.1.2 Hydraulic burst test
16.2.1.3 Additional test
16.3 Manufacturing tests on each drum
16.3.1 Volume check
16.3.2 Tare weight check
16.3.3 Proof pressure test
16.3.4 Pneumatic test
16.3.5 Final inspection
16.3.6 Tightness test
17 Marking
17.1 Drums
17.2 Hot pressure welded drums
17.3 Pressure drums for very toxic gases (LC50 less than 200 ppmV)
17.4 Position and size of marking
18 Certification
18.1 Type approval
18.2 Manufacturing conformance
19 Certificate
Annex A
A.1 General
A.1.1
A.1.2
A.1.3
A.2 Manufacturing defects
A.3 Rejected drums
Annex B
B.1 Drum characteristics
B.2 Calculation
B.2.1 Thickness of cylindrical wall
B.2.1.1 Calculation at test pressure using Formula (1) (see 6.3.1)
B.2.1.2 Calculation at burst pressure using Formula (2) (see 6.3.1)
