scope:

This part of ISO 9809 specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examinations and tests at manufacture of refillable quenched and tempered seamless steel gas cylinders of water capacities from 0,5 l up to and including 150 l for compressed, liquefied and dissolved gases. This part of ISO 9809 is applicable to cylinders with a maximum tensile strength Rma of greater than or equal to 1 100 MPa. It does not cover cylinders with Rm max > 1 300 MPa for diameters > 140 mm and guaranteed wall thicknesses (a ¡ä) ¡Ý 12 mm, and Rm max ¡Ý 1 400 MPa for diameters ¡Ü 140 mm and guaranteed wall thicknesses (a¡ä) ¡Ý 6 mm, because beyond these limits additional requirements may apply.
NOTE 1 If so desired, cylinders of water capacity less than 0,5 l and between 150 l and 500 l may be manufactured and certified be in full compliance with to this part of ISO 9809.
NOTE 2 For quenched and tempered cylinders with maximum tensile strength less than 1 100 MPa refer to ISO 9809-1.
For normalized steel cylinders refer to ISO 9809-3.
NOTE 3 Grades and strength ranges of steels used for these types of cylinders might not be compatible with some gas service (see 6.1.4) and operational conditions.