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ISO 9809-2:2019 Gas cylinders - Design, construction and testing of refillable seamless steel gas cylinders and tubes - Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or equal to 1 100 MPa >
ISO 9809-2:2019 Gas cylinders - Design, construction and testing of refillable seamless steel gas cylinders and tubes - Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or equal to 1 100 MPa, 2019
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Inspection and testing
- 6 Materials
- 6.1 General requirements
- 6.2 Controls on chemical composition
- 6.3 Heat treatment
- 6.4 Failure to meet test requirements
- 7 Design
- 7.1 General requirements
- 7.2 Limitation on tensile strength
- 7.3 Design of cylindrical shell thickness
- 7.4 Design of convex ends (heads and bases)
- 7.5 Design of concave base ends
- 7.6 Neck design
- 7.7 Foot rings
- 7.8 Neck rings
- 7.9 Design drawing
- 8 Construction and workmanship
- 8.1 General
- 8.2 Wall thickness
- 8.3 Surface imperfections
- 8.4 Ultrasonic examination
- 8.5 Out-of-roundness
- 8.6 Mean diameter
- 8.7 Straightness
- 8.8 Verticality and stability
- 8.9 Neck threads
- 9 Type approval procedure
- 9.1 General requirements
- 9.2 Prototype tests
- 9.2.1 General requirements
- 9.2.2 Verification of hardness/tensile correlation
- 9.2.3 Pressure cycling test
- 9.2.4 Flawed cylinder burst test
- 9.2.5 Flawed cylinder cycle test
- 9.2.6 Base check
- 9.2.7 Bend test and flattening test
- 9.2.8 Torque test for taper thread only
- 9.2.9 Shear stress calculation for parallel threads
- 9.3 Type approval certificate
- 10 Batch tests
- 10.1 General requirements
- 10.2 Tensile test
- 10.3 Impact test
- 10.4 Hydraulic bursting test
- 10.4.1 Test installation
- 10.4.2 Test conditions
- 10.4.3 Interpretation of test results
- 11 Tests/examinations on every cylinder
- 11.1 General
- 11.2 Hydraulic test
- 11.2.1 Proof pressure test
- 11.2.2 Volumetric expansion test
- 11.3 Hardness test
- 11.4 Leak test
- 11.5 Capacity check
- 12 Certification
- 13 Marking
- Annex A (normative) Description and evaluation of manufacturing imperfections in seamless gas cylinders
- Annex B (normative) Ultrasonic examination
- Annex C (informative) Example of type approval certificate
- Annex D (informative) Example of acceptance certificate
- Annex E (informative) Bend stress calculation
- Annex F (informative) An example of shear strength calculation for parallel threads
- Bibliography [Go to Page]