BS ISO 18172-2:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
   3.1 Terms and definitions
   3.2 Symbols
4 Materials and heat treatment
   4.1 General
   4.2 Categories
   4.3 Heat treatment
   4.4 Test requirements
5 Design
   5.1 General requirements
   5.2 Calculation of cylindrical shell wall thickness
   5.3 Design of convex ends
   5.4 Minimum wall thickness
   5.5 Ends of other shapes
   5.6 Design of openings
   5.7 Bungs
6 Construction and workmanship
   6.1 General
   6.2 Welding
   6.3 Cryoforming procedure
   6.4 Welded joints of pressure-containing parts
   6.5 Non-pressure-containing attachments
   6.6 Valve protection
   6.7 Neck threads
   6.8 Visual examination
7 New design tests
   7.1 General requirements
   7.2 Verifications and tests
   7.3 Descriptions of tests
   7.4 Design testing certificate
8 Batch tests
   8.1 General
   8.2 Information
   8.3 Tensile test
   8.4 Bend test
   8.5 Impact test
   8.6 Macroscopic examination of weld cross-sections
   8.7 Checks and verifications
9 Tests on every cylinder
   9.1 Pressure test
   9.2 Hardness test
   9.3 Leakage test
10 Failure to meet test requirements
11 Markings
12 Certificate
Annex A (normative) Radiographic examination of welds
Annex B (normative) Description and evaluation of
        manufacturing defects and conditions for rejection
        of welded stainless steel gas cylinders at time of
        visual inspection
Annex C (informative) Examples of design and batch testing
        certificates
Bibliography

Describes minimum requirements concerning material, design, construction and workmanship, manufacturing processes and testing of refillable transportable welded stainless steel gas cylinders, of water capacities from 0,5 1 up to and including 150 l, for compressed and liquefied gases.

This part of ISO18172 specifies minimum requirements concerning material, design, construction and workmanship, manufacturing processes and testing of refillable transportable welded stainless steel gas cylinders, of water capacities from 0,5l up to and including 150l, for compressed and liquefied gases. This part of ISO18172 is applicable only to cylinders manufactured from stainless steels with a maximum tensile strength of less than 1100MPa and a test pressure above 6MPa (60 bar).