ISO 11118 pdf download.Gas cylinders — Non-refillable metallic gas cylinders — Specification and test methods
1 Scope
This International Standard specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes and tests at manufacture of non-refillable metallic gas cylinders of welded, brazed or seamless construction for compressed, liquefied and dissolved gases exposed to extreme worldwide ambient temperatures. NOTE The specific gases permitted in cylinders constructed to this International Standard may be limited by ISO, national requirements or international requirements. This International Standard is applicable to cylinders where: a) the maximum permissible operating pressure does not exceed 250 bar (i.e. p ms < 250 bar); b) the product of the maximum permissible operating pressure and the water capacity does not exceed 1 000 bar.litres (i.e. p ms . V < 1 000 bar.l); c) where the maximum permissible operating pressure exceeds 35 bar, the water capacity does not exceed 5 l (i.e. for p ms . 35 bar, then V < 5 l). This International Standard is not applicable to cylinders exceeding these pressure and volume limits, for which reference may be made to refillable cylinder standards. This International Standard is also not applicable to cartridges/aerosol dispensers 1 ) and spherical containers.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 31 66-1 , Codes for the representation of names of countries and their subdivisions — Part 1 : Country codes . ISO 3574:1 986, Cold reduced carbon steel sheet of commercial and drawing qualities
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply. 3.1 batch quantity of completed and pressure-tested cylinders of the same design, prototype design, water capacity, material, heat treatment (if any) and manufacturing process made successively during one production shift of up to 1 2 h 3.2 cylindrical shell portion of the cylinder, excluding the heads (ends), which is parallel to the centreline axis of the cylinder 3.3 heads (ends) portions of the cylinder which are not parallel to the centreline axis of the cylinder 3.4 material certificate document, issued by the material manufacturer, which states the chemical analysis, mechanical properties, heat treatment, processing techniques or other properties/features if required 3.5 burst pressure highest pressure reached in a cylinder during the burst test 3.6 maximum permissible operating pressure highest pressure permitted to be developed during service 3.7 test pressure required pressure applied during the pressure test (see annex A) 3.8 working pressure settled pressure of permanent gas at a uniform temperature of 15 °C (288 K) (see annex A) 3.9 maximum operating temperature maximum ambient temperature to which the cylinder contents can be exposed in the country of use (see annex A) 3.10 minimum operating temperature minimum ambient temperature to which the cylinder contents can be exposed in the country of use (see annex A)
5.2 Type
5.2.1 Carbon and low-alloy steels 5.2.1.1 The steel used for the fabrication of gas cylinders shall be made in an electric furnace or by the basic oxygen process, shall have non-ageing properties and shall be killed. 5.2.1.2 Carbon steel for cold deep drawn welded or brazed cylinders shall be in accordance with Table 1 of ISO 3574:1 986, having non-ageing properties, drawing quality, processed free of stretcher strains and shall have an aluminium content in excess of 0,01 %. The chemical composition shall meet the requirements of 5.3.1 .1 . 5.2.1.3 Carbon steel for other welded cylinders shall have a chemical composition which meets the requirements of 5.3.1 .2. The maximum tensile strength shall not exceed 700 MPa. 5.2.1.4 Carbon steel for cylinders made from seamless steel tubing with integrally formed ends, hot drawn and finished shall have a chemical composition which meets the requirements of 5.3.1 .3. 5.2.1.5 Low alloy steels shall comply with either ISO 4705, ISO 4706, ISO 9809-1 or ISO 9809-2. 5.2.2 Aluminium and aluminium alloys 5.2.2.1 Aluminium alloys with a tensile strength greater than 500 MPa shall not be used. 5.2.2.2 Aluminium and aluminium alloys shall have a chemical composition which meets the requirements of 5.3.2. 5.2.2.3 Aluminium and aluminium alloys for seamless cylinders shall meet the requirements of ISO 7866.