Issues with nitrogen sealing and oil vapor recovery in storage tanks
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I would like to ask the experts: For the internal floating roofs used in tanks Type A B and Type B A, if the material of the floating disk is a soluble material, then according to Article 1 of Section 6.2.2 of the \"Fire Protection Design Standards for Petrochemical Enterprises\", safety measures such as nitrogen protection should be implemented. So, when nitrogen protection measures are in place, is it necessary to install oil and gas recovery facilities as well? If tank B is equipped with an internal floating disk made of a readily soluble material, is it still necessary to install nitrogen protection facilities?
As for whether oil and gas should be recovered, the first thing to consider is the regulations, and the second is cost-effectiveness. If there are local standards (DB3151) specifying emission limits for volatile organic compounds, then it is necessary to carry out treatment, absorption, or recovery processes. For Category B systems, an internal floating roof is not required; a vent valve and flame arrester can be installed instead