What is ISO 9809‑2 - Gas cylinders about?
ISO 9809 is a series on gas cylinders. A gas cylinder is a pressure vessel for the storage and containment of gases at above atmospheric pressure. ISO 9809‑2 specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examination and testing at the time of manufacture for refillable seamless steel gas cylinders and tubes with water capacities up to and including 450 l.
ISO 9809‑2 is applicable to cylinders and tubes for compressed, liquefied, and dissolved gases and for quenched and tempered steel cylinders and tubes with an actual tensile strength Rma ≥ 1 100 MPa.
Note: ISO 9809‑2 is not applicable to cylinders and tubes with Rma, max > 1 300 MPa for diameters >140 mm and guaranteed wall thicknesses a′ ≥ 12 mm and for cylinders and tubes with Rma, max > 1 400 MPa for diameters ≤140 mm and guaranteed wall thicknesses a′ ≥ 6 mm because, beyond these limits, additional requirements can apply.
Who is ISO 9809‑2 - Gas cylinders for?
ISO 9809‑2 on gas cylinders is useful for:
- Gas cylinder manufacturers
- Gas tubes manufacturers
- Design engineers
- Quality control personnel
Why should you use ISO 9809‑2 - Gas cylinders?
Inside the cylinder the stored contents may be in a state of compressed gas, vapour over liquid, supercritical fluid, or dissolved in a substrate material, depending on the physical characteristics of the contents. A typical gas cylinder design is elongated, standing upright on a flattened bottom end, with the valve and fitting at the top for connecting to the receiving apparatus. ISO 9809‑2 provides a specification for the design, manufacture, inspection and testing of a seamless steel cylinder and tube. The objective is to balance design and economic efficiency against international acceptance and universal utility. ISO 9809‑2 aims to eliminate existing concerns about climate, duplicate inspections, and restrictions because of a lack of definitive International Standards.
The material used for the manufacture of gas cylinders are steel, other than rimming quality, with non-ageing properties and shall be fully killed with aluminium and/or silicon. In cases where examination of this non-ageing property is required by the customer, the criteria by which it is to be specified should be agreed with the customer and inserted in the order. High strength cylinders made in accordance with ISO 9809‑2 are normally not compatible with corrosive or embrittling gases. They may nevertheless be used with these gases provided that their compatibility is proven by a recognized test method. Using ISO 9809‑2 you can specify minimum requirements for the material, design, construction and workmanship, manufacturing processes, examination and testing at the time of manufacture for refillable seamless steel gas cylinders and tubes.
What’s changed since the last update?
BS EN ISO 9809‑2:2019 supersedes BS EN ISO 9809‑2:2010. BS EN ISO 9809‑2:2019 includes some technical changes with respect to BS EN ISO 9809‑2:2010. These include:
- Water capacity extended from below 0,5 l and up to and including 450 l
- Batch size for tubes now introduced
- Bend test retained only for prototype tests
- Test requirements for check analysis (tolerances modified)
- New test requirements for threads introduced including an informative annexe f
