Do both Class A/B and Class B/A storage tanks need nitrogen sealing devices?

Model 3007 requires a nitrogen seal to be installed. The measure that must be taken when using a dome tank is to have a nitrogen seal

Both Class A B and Class B A oils are volatile, and dome tanks should not be used for them under normal circumstances, as this would increase uncontrolled emissions and pose significant safety risks. If you switch to internal floating roof tanks, there is no need to consider nitrogen sealing.

Follow the experts’ instructions, and the exhaust gas must be treated to meet the required standards before being released. I would like to ask why environmental protection requires the dome to be changed to an internal floating roof Simply switching to internal floating roof tanks will reduce emissions, but a more effective method is to use a nitrogen blanket on the roof. Moreover, for small storage tanks, switching to an internal floating roof will result in a significantly smaller usable volume of the tank.

7.4 Nitrogen sealing management 7.4.1 Nitrogen sealing facilities should be considered in the following situations: 1 Storing materials that are prone to oxidation, polymerization, or instability； 2 Spaces within the storage tank where explosive flammable gases can form ； 3 Storing oils with high sulfur content can easily lead to spontaneous combustion of FeS. 7.4.2 For Class A and B liquid storage tanks sealed with nitrogen, accident pressure relief devices such as pressure relief manholes and breathing manholes should also be installed to ensure the safety of the tanks. 7.4.3 The sealing of accessories such as vent holes on nitrogen-sealed storage tanks should be of a removable type, to facilitate the return to normal tank operation promptly once the nitrogen sealing is no longer in use. 7.4.4 Gas connection lines should be provided between nitrogen-sealed storage tanks. A shut-off valve and pressure monitoring instruments should be installed on the gas connection line. 7.4.5 Control valves, pressure gauges, and pressure transmitters for the nitrogen sealing system should be installed at the platform on top of the tank. 7.4.6 Use of nitrogen blanketing 1 Under normal circumstances, sampling and measurement on the tank top should not be carried out on tanks with nitrogen blanketing. When it is necessary to work inside the tank, a portable detector equipped with functions for detecting oxygen, flammable gases, and hydrogen sulfide must be worn; when opening the tank is involved, a self-contained breathing apparatus should be used. 2 The operation of the nitrogen-sealed tank should be inspected regularly. The breather valves on the 3 tanks should be inspected quarterly, while the self-standing pressure control valves or control valves should be inspected monthly; in winter, inspections should be carried out weekly. In cases of special weather conditions such as rain or snow, the frequency of inspections should be increased, and inspection records must be kept. 4 Before filling the nitrogen-sealed tank with oil for the first time, the oxygen content inside the tank must be tested and found to be within acceptable limits. 5 When nitrogen supply is interrupted, stop the oil transfer operation from the tank.