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BS ISO 9809-4:2021 – TC:2022 Edition

BS ISO 9809-4:2021 – TC:2022 Edition

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Tracked Changes. Gas cylinders. Design, construction and testing of refillable seamless steel gas cylinders and tubes – Stainless steel cylinders with an Rm value of less than 1 100 MPa

Published By Publication Date Number of Pages
BSI 2022 156
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This document specifies the minimum requirements for the materials, design, construction and workmanship, manufacturing processes, examinations and testing at time of manufacture for refillable, seamless, stainless steel gas cylinders with water capacities up to and including 150 l.

It is applicable to cylinders for compressed, liquefied and dissolved gases with a maximum actual tensile strength, R ma, of less than 1 100 MPa.

NOTE

If so desired, cylinders of water capacity between 150 l and 450 l can be manufactured to be in full conformance to this document.

PDF Catalog

PDF Pages PDF Title
1 30451995
93 A-30385443
94 undefined
99 Foreword
100 Introduction
101 1 Scope
2 Normative references
3 Terms and definitions
103 4 Symbols
104 5 Inspection and testing
6 Materials
6.1 General requirements
105 6.2 Controls on chemical composition
6.3 Heat treatment
6.4 Cold working or cryoforming
106 6.5 Failure to meet test requirements
7 Design
7.1 General requirements
7.2 Design of cylindrical shell thickness
107 7.3 Design of convex ends (heads and bases)
108 7.4 Design of the concave base ends
109 7.5 Neck design
7.6 Foot rings
7.7 Neck rings
110 7.8 Design drawing
8 Construction and workmanship
8.1 General
8.2 Wall thickness
8.3 Surface imperfections
8.4 Ultrasonic examination
111 8.5 Out-of-roundness
8.6 Mean diameter
8.7 Straightness
8.8 Verticality and stability
112 8.9 Neck threads
9 Type approval procedure
9.1 General requirements
113 9.2 Prototype test
9.2.1 General requirements
114 9.2.2 Pressure cycling test
9.2.3 Base check
115 9.2.4 Torque test for taper thread only
9.2.5 Shear stress calculation for parallel threads
9.3 Type approval certificate
116 9.4 Specific type approval/production tests for cylinders ordered in small quantities
10 Batch tests
10.1 General requirements
118 10.2 Tensile test
119 10.3 Bend test and flattening test
10.3.1 Bend test
120 10.3.2 Flattening test
10.3.3 Ring flattening test
10.4 Impact test
122 10.5 Hydraulic burst test
10.5.1 Test installation
123 10.5.2 Test conditions
124 10.5.3 Interpretation of test results
125 10.6 Intergranular corrosion test
11 Tests/examinations on every cylinder
11.1 General
126 11.2 Hydraulic test
11.2.1 Proof pressure test
11.2.2 Volumetric expansion test
11.3 Hardness test
11.4 Leak test
127 11.5 Capacity check
12 Certification
13 Marking
128 Annex A (normative) Description and evaluation of manufacturing imperfections and conditions for rejection of seamless steel gas cylinders at the time of final inspection by the manufacturer
143 Annex B (normative) Ultrasonic examination
149 Annex C (informative) Example of type approval certificate
150 Annex D (informative) Example of acceptance certificate
152 Annex E (informative) Example of shear strength calculation for parallel threads
154 Bibliography

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BS ISO 9809-4:2021 - TC
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