【Common Issues in Haichuan Pipeline Design】--Nitrogen Setting Requirements
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Nitrogen setting requirements: 1. \"Design Code for Automated Systems in Petrochemical Tank Farms\" SH/T 3184-2017, 4.2.2.8 – A pressure gauge should be installed on the nitrogen inlet pipeline of the nitrogen seal valve. II. \"Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems\" (SH/T 3007-2014): 3.5 For combustible liquid storage tanks protected by nitrogen sealing, the operating pressure should be in the range of 0.2 kPa to 0.5 kPa; for other tanks equipped with breather valves, the operating pressure should be in the range of 1 Pa to 1.5 kPa. III. \"Fire Protection Design Code for Petrochemical Enterprises (2018 Edition)\" (GB 50160-2008): 7.2.7 When utility pipelines are connected to pipelines or equipment that carry combustible gases, liquefied hydrocarbons, or combustible liquids, the following requirements must be met: 1. Check valves should be installed on utility pipelines that are used continuously, along with isolation valves at their bases ； 2. Check valves and one isolation valve, or two isolation valves, should be installed on utility pipes that are used intermittently, with a inspection valve placed between the two isolation valves ； 3. Utility pipes used only when the equipment is shut down should be equipped with blind flanges or disconnected. IV. Code for Design of Layout of Metal Piping in Petrochemical Industries, SH/T3012-2011: 9.4.1 When semi-fixed purging nitrogen is required in the plant, nitrogen connections shall be provided at the hose station, along with double valves.
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