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— metallurgical behaviour and time dependent strength (ultimate tensile strength after 100 000 hours) are in accordance with national or international codes or standards, and — such values are guaranteed by the steel manufacturer. 2.2.3 Where the above conditions cannot be met, special heat resisting alloy steels shall be used. 2.3 Copper and copper alloys 2.3.1 Copper and copper alloy pipes for application as class I or class II shall be of seamless drawn material in accordance with DNVGL-OS-B101. 2.3.2 Copper and copper alloys shall not be used for media having temperature above the limits given in Table 2. Table 2 Operating temperature limits of copper and copper alloy piping Piping material Copper and aluminium brass Copper nickel Special bronze suitable for high temperature service Temperature limit 200°C 300°C 260°C 2.3.3 Copper or copper alloys shall not be used for pipes with outer diameter > 44.5 mm for compressed air service with pressure above 20 bar. 2.4 Cast iron 2.4.1 Grey cast iron shall not to be used for piping subject to pressure shock, excessive strains and vibration. 2.4.2 Grey cast iron shall not be used for class I and II piping with the following exceptions: — components in hydraulic piping systems where failure would not render the system inoperative or introduce a fire risk — pump and filter housings in fuel and lubrication oil systems where the design temperature does not exceed 120°C. 2.4.3 Grey cast iron may be used for class III piping, with the following exceptions: — pipes and valves fitted on the unit or installation sides and bottom and on sea chests — valves fitted on collision bulkhead — valves under static head fitted on the external wall of fuel tanks, lub. oil tanks and tanks for other flammable fluids — bilge and ballast lines in tanks — valves for fluids with temperatures in excess of 120°C. 2.4.4 Nodular cast iron of the ferritic type, with a specified minimum elongation of 12%, may be used in class II and III piping, in pipes and valves located on the unit or installation's side and bottom, and valves on the collision bulkhead. Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 27 Marine and machinery systems and equipment DNV GL AS Chapter 2 Section 2PDF Image | Marine and machinery systems and equipment 2018
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