What is an appropriate pressure level to release when an LNG storage tank is overpressured?
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An alarm is triggered at 0.95 Mpa. Is the rate of vaporization of the liquid the same when the pressure is set at 0.3 Mpa and 0.7 Mpa? Could lowering the pressure increase the vaporization rate?
Theoretically, yes – the lower the pressure, the faster the vaporization rate!
The pressure level of the storage tank has little to do with the LNG vaporization rate.
This post was last edited by Pandora on 2020-6-16 at 16:35; it depends on the specific operating conditions. If there is no inflow, no outflow, and no vaporization, the self-evaporation of the liquid has nothing to do with pressure. Unloading, vaporization, and external transfer are related to pressure; higher pressure results in greater evaporation.
Is this a storage tank for a gas station or a gasification plant? Generally speaking, the higher the pressure, the faster the vaporization rate. Of course, it is also related to the carburetor on-site; if the carburetor is too small, vaporization will not be sufficient
Actually, it also depends on the temperature of the liquid; if the temperature is high, unless the pressure is reduced to allow some heat to be removed
When LNG is stored under pressure, heat from the outside continuously enters the tank, causing the pressure to rise steadily； When the pressure rises to the set pressure of the safety valve, it will open to protect the container ； What we can do during operation is to monitor the rate at which its pressure rises and release it in advance. As for the appropriate level of release, it needs to be determined based on a combination of factors such as the design pressure of the storage tank, the rate at which the tank’s pressure rises (which is essentially related to the adiabatic properties of the vacuum), the proper closing of relevant valves to prevent the formation of pressure buildup circuits, and the duration of storage. For example, if gas is needed immediately, there’s no need to worry too much; current BOG supply can suffice.