Nitrogen sealing issue
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Let’s discuss under what circumstances a storage tank needs to be nitrogen-sealed
Media that readily produce volatile, toxic, harmful, flammable, and explosive gases
There are also some materials that undergo chemical reactions when in contact with air
Sealing issues that cannot be resolved by using nitrogen sealing.
Does drinking fresh water also require nitrogen sealing?
I believe the purpose of nitrogen sealing is to apply pressure with nitrogen when the saturated vapor pressure of the medium in the storage tank at the storage temperature is lower than atmospheric pressure, and when the medium in the tank must not mix with air (for example, due to an explosion risk). Because without nitrogen supplementation, the pressure in the storage tank cannot be balanced. For tanks whose gas phase is directly connected to the atmosphere, a nitrogen seal is generally not installed; however, if it is desired to reduce the evaporation of the medium inside the tank, introducing nitrogen gas can be considered. {:1_90:}
Release combustion-supporting oxygen to maintain stable pressure in the storage tank
1. Fixed-roof tanks for heavy oil with a storage temperature exceeding 120°C shall be provided with nitrogen protection. Basis: Article 6.2.4A of the “Code for Fire Protection Design of Petrochemical Enterprises (2018 Edition)” (GB 50160-2008). 2. When internal floating-roof tanks with a single-tank volume of 5000 m3 or less use floating decks made of fusible materials, safety measures such as nitrogen protection shall be implemented； Reference: Article 6.2.2, Clause 3 of the \"Code for Fire Protection Design of Petrochemical Enterprises (2018 Edition)\” (GB 50160-2008) – Fixed-roof tanks of Class A B and Class B A. Reference: Article 4.2 of the \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\" (SH/T 3007-2014)
GB 50160: SH/T3007: