Regarding the issue of nitrogen sealing for containers.
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Excuse me, experts: when the pressure in the container is low, there is fuel gas on top along with nitrogen. Which gas is usually used for pressure replenishment?
I don’t understand; what does \"repressurize\" mean?
I mean, for example, when the pressure is low, shouldn’t a buffer valve supply more pressure? But there are two types of gases above: fuel gas and nitrogen. Under normal circumstances, which gas is used to replenish the pressure?
Generally, the fuel gas is used to pressurize the container first; once the fuel gas valve is fully open and the pressure in the container is still insufficient, nitrogen is then used to increase the pressure. This is because the pressure in the nitrogen pipeline network at the refinery is higher than that in the fuel gas pipeline network.