Determination of the gas volume for oil and vapor recovery in storage tanks

Personally, I think it should be determined based on the maximum flow rate of liquid in and out.

We determine it based on the maximum amount of fluid in and out. The manager said that the heat respiration rate is only meant as a reference and has no practical use. . .

Relatively speaking, the inflow and outflow volumes are stable and controllable. The breathing capacity of the breather valve takes extreme operating conditions into account, so it is not suitable for use in normal recovery processes. However, if oil and gas recovery replaces venting, the system still needs to have measures in place to handle maximum emission levels

Do you still dare to go up? Safety Supervision Bureau Order No. 68

If you ignore it, the amount of heat exchange that occurs in each storage tank is indeed significant and cannot be overlooked; but if you take it into account, then each tank area has a heat exchange rate of thousands of cubic meters per hour, with some even reaching tens of thousands. Is it realistic to install an oil and gas recovery facility with a capacity of 10,000 m3/h in a single tank farm? The environmental protection authorities don’t provide any standards or specifications, so what’s the point for us designers who have to deal with such situations? ?

Yes, there are three aromatic hydrocarbon storage areas, each covering over 200,000 cubic meters. I don’t even know how to proceed with the calculations after accounting for all of these. If the size is too large, it’s not practical; if it’s too small, it might not meet the requirements. The standards don’t provide any specific calculation methods either, so it’s impossible to move forward.

Generally, the oil and gas recovery capacity is calculated based on the maximum feed rate of a certain tank group. If this tank bank can accommodate up to three storage tanks for feeding, with each tank having a feeding rate of 200 m3/h, then the maximum processing capacity of the oil and gas recovery unit is 600 m3/h (of course, a margin can also be included). Since oil and gas recovery currently relies mostly on condensation + adsorption, overly high design values may lead to excessive energy consumption. Thermal respiration is not a stable state, and it is also difficult to monitor the amount of respiration per unit time; therefore, it cannot be used as a measurement standard. Of course, it is also possible to appropriately reduce the volume of oil and gas to be recovered and treated, by implementing controls during the process operations; for example, reducing the designed treatment volume from 600 to 400, while controlling the feeding of at most two tanks. . . .

Are there any standards for calculating the oil and gas volume in oil tanks?