Are the gasoline tanks and ethanol tanks in the oil depot sealed with nitrogen?

It’s better to add it; it mainly depends on the flash point and volatile gases

Refer to SH/T 3007-2014 \"Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems\", sections 4.2.5 and 4.2.10.

Gasoline storage tanks must be equipped with such systems; they are safety measures. Gasoline has a low flash point and evaporates quickly, which increases its risk level.

This post was last edited by bfdlwolf on 2019-2-28 08:36 (SH/T 3007-2014). 4.2.4 For Class B liquids with a storage boiling point below 45 °C or a saturated vapor pressure greater than 88 kPa at 37.8 °C, pressure tanks, low-pressure tanks, or atmospheric-pressure tanks used for storage at reduced temperatures should be employed, and the following requirements must be met: a) When using pressure tanks or low-pressure tanks, measures must be taken to prevent air from entering the tanks, and the gases released from these tanks must be collected and treated in a sealed manner; b) When using atmospheric-pressure tanks for storage at reduced temperatures, one of the following measures must be taken: – Use internal floating-roof tanks, along with a nitrogen or other inert gas sealing system, to maintain a storage temperature such that the liquid’s vapor pressure does not exceed 88 kPa; – Use fixed-roof tanks, along with a nitrogen or other inert gas sealing system, to keep the storage temperature 5 °C or lower than the liquid’s flash point; – Use fixed-roof tanks, along with a nitrogen or other inert gas sealing system, to maintain a storage temperature such that the liquid’s vapor pressure does not exceed 88 kPa, while also collecting and treating the gases released from the tanks in a sealed manner. 4.2.5 For storing Class A B and Class A C liquids with a boiling point of 45 °C or higher, or with a saturated vapor pressure of not more than 88 kPa at 37.8 °C, floating roof tanks or internal floating roof tanks should be used. For other Class A B and Class B A liquid chemical products that require special storage conditions, fixed-roof storage tanks, low-pressure storage tanks, or horizontal storage tanks with a capacity of 100 m3 or less can be used; however, one of the following measures must be taken: install a nitrogen or other inert gas sealing system to contain and treat the gases emitted from the tank, or install a nitrogen or other inert gas sealing system to keep the storage temperature 5 °C or lower than the liquid’s flash point. 4.2.10 Storage tanks for Class A, Group B and Class A, Group A liquids with toxicity levels I and II shall not exceed 10,000 m3, and shall be equipped with a nitrogen or other inert gas sealing protection system.