AS/NZS ISO 21172.1:2025
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
Standard 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. Only cylindrical and spherical containers are covered.
This document is identical with, and has been reproduced from, ISO 21172‑1:2015 Gas cylinders – Welded steel pressure drums up to 3 000 l capacity for the transport of gases – Design and construction – Part 1: Capacities up to 1 000 l, and its Amendment No. 1 (2018) which has been added at the end of the source text.
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AS/NZS ISO 21172.1:2025 Welded steel pressure drums up to 3 000 litres capacity for the transport of gases - Design and construction Capacities up to 1 000 litres
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
6.4 Minimum thickness for handling
6.5 Fittings
6.5.1 General
6.5.2 Screwed fittings
6.5.3 Bolted connections
6.5.4 Protection of fittings
6.5.5 Fittings and valves protection
6.5.6 Compensation of openings
7 Lifting attachments and rolling bands
7.1 Vertical and spherical drums
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
15.3 Number of test specimens
15.4 Mechanical tests
15.4.1 Tensile tests
15.4.2 Bend tests
15.4.3 Impact test
15.4.4 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
16.3 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 (informative) Description and evaluation of manufacturing of a welded steel pressure drums at the time of visual inspection
Annex B (informative) Example of calculation note for determination of thickness for shell and dished end for pressure drums according to 6.4
Annex C (informative) Example of Approval certificate
Annex D (informative) Hot pressure welded heads
Annex E (normative) Manufacturing defects in welded steel pressure drums and rejection criteria
Bibliography
Amendment 1
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AS/NZS ISO 21172.1:2025 Welded steel pressure drums up to 3 000 litres capacity for the transport of gases - Design and construction Capacities up to 1 000 litres
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
6.4 Minimum thickness for handling
6.5 Fittings
6.5.1 General
6.5.2 Screwed fittings
6.5.3 Bolted connections
6.5.4 Protection of fittings
6.5.5 Fittings and valves protection
6.5.6 Compensation of openings
7 Lifting attachments and rolling bands
7.1 Vertical and spherical drums
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
15.3 Number of test specimens
15.4 Mechanical tests
15.4.1 Tensile tests
15.4.2 Bend tests
15.4.3 Impact test
15.4.4 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
16.3 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 (informative) Description and evaluation of manufacturing of a welded steel pressure drums at the time of visual inspection
Annex B (informative) Example of calculation note for determination of thickness for shell and dished end for pressure drums according to 6.4
Annex C (informative) Example of Approval certificate
Annex D (informative) Hot pressure welded heads
Annex E (normative) Manufacturing defects in welded steel pressure drums and rejection criteria
Bibliography
Amendment 1
AS/NZS ISO 21172.1:2025
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.