Specifies requirements for the materials, design, construction, testing, and inspection of pressure vessels for pressure up to 21 MPa and temperatures within the limits for the various materials and components. Welded, forged, brazed, and cast constructions in ferrous and non-ferrous metals are covered. It is not intended to apply to large low pressure storage vessels, to machinery such as pumps and compressors, or to vessels within the scope of other Australian Standards. The specific design requirements are based on a simplified engineering approach and are intended to be the standard methods of design, but provision is also made for other methods to be used provided that the validity of the design is satisfactorily established.