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Guidance note: A project may decide to categorise systems more stringently based on considerations other than safety. Factors such as consequence of failure and ease of repair with respect to need to limit operations may also be considered. Table 1 Classes of piping systems Piping system for Steam Thermal oil Flammable fluids 2) Other media 3) Class I 1) Class II 1) Class III 1) 4) ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- p (bar) > 16 > 16 > 16 > 40 t (°C) or > 300 or > 300 or > 150 or > 300 p (bar) ≤ 16 ≤ 16 ≤ 16 ≤ 40 t (°C) and ≤ 300 and ≤ 300 and ≤1 50 and ≤ 300 p (bar) ≤ 7 ≤ 7 ≤ 7 ≤ 16 t (°C) and ≤ 170 and ≤ 150 and ≤ 60 and ≤ 200 p = Design pressure, as defined in [3.4.2] t = Design temperature, as defined in [3.4.4] 1) For class II and III piping both specified conditions are to be met, for class I piping one condition only is sufficient. 2) Flammable fluids include: lubricating oil, flammable hydraulic oil, fuel oil and systems covered by Sec.4 [12]. 3) Open ended pipes (drains, overflows, vents, boiler escape pipes etc.) independently of the pressure and temperature, are pertaining to class III. 4) Additional NDT requirements is applicable for class III piping for safety critical systems in oil production and storage units. See Sec.6 Table 4. Note: Cargo piping for chemicals or liquefied gases are not covered by the table. Requirements for these systems are found in DNVGL-RU-SHIP Pt.5 Ch.6 and DNVGL-RU-SHIP Pt.5 Ch.7. 2 Materials 2.1 General principles ---e-n-d---o-f---n-o-t-e--- 2.1.1 Materials used in piping systems shall be suitable for the medium and service for which the system is intended. Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 25 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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