The Best in Moving Equipment

This post was last edited and shared by SAN*NGR428 on 2018-10-7 at 17:23, featuring the ethylene pressure sphere tank with the thickest wall made of 09MnNiDR material. Nominal volume: 3000 m3; Design pressure: 2.16 MPa; Design temperature: -67°C; Corrosion allowance: 2 mm; Material stored: Ethylene (520 kg/m3); Inner diameter of the spherical shell: 18000 mm; Design standard: JB4732; Shell thickness: 66 mm; Weight of a single spherical tank: 574612 Kg. 09MnNiDR is a material specified by the GB3531 standard; thanks to its excellent low-temperature impact toughness (with an impact energy of 34 J at -70°C), it is widely used in low-temperature containers in China. Its welding properties, low-temperature toughness, and resistance to stress corrosion caused by impurities all make it easy to meet the requirements of processing, production, and operation ； 09MnNiDR and the associated forgings and welding materials can be produced in China, with relatively low equipment costs. The newly revised GB150.2-2011 states that the thickness of spherical shell plates should not exceed 50 mm; the thickness of the plates used for this ethylene tank is 66 mm, which is considered to be the maximum allowable thickness. It is assembled in three sections; the largest single steel plate has a length of 12.6 m, a width of nearly 3 m, and a thickness of 66 mm. This imposes higher demands on the production capabilities of steel mills – as thin steel plates have fewer inclusions and stratifications compared to thick ones, and their fiber structure is more uniform, resulting in better quality plates – as well as on the capacity of the rolling mills.