installation on all vessels classed by DNV GL. Temperature range: Up to 200°C Max. working press.: up to 50MPa Sizes: 6mm up to 22mm Issued at Hamburg on 2019-04-11 This Certificate is valid until 2024-04-10. DNV [...] – Materials. Sizes and pressure range2 Tube O.D. Tube O.D. Nominal pressure1 Metric mm Inch in PN MPa 6, 8, 10 3/16, ¼, 5/16 50 12 3/8 40 14, 15 ½, 5/8 40 16, 18 ¾, 7/8 32 20 1 25 22 -- 25 Notes 1 For