How to determine the size of the water collection tank in a horizontal liquid separation tank

The size of the water collection tank in a horizontal liquid separation tank is determined primarily by the following factors: 1. **Treatment flow rate**: Based on the maximum flow rate that the tank can handle, it is necessary to ensure that the water collection tank can effectively separate the liquids, preventing the liquids from being carried away by gases due to high flow rates. 2. **Separation efficiency**: The design of the water collection bag must meet certain separation efficiency requirements, which generally depend on the properties of the inlet fluid (such as the gas-liquid ratio and liquid viscosity) as well as the demands of the separation process. 3. **Operating conditions**: Operating conditions (such as working pressure and temperature) also affect the size of the collection tank, as they directly influence the density and viscosity of gases and liquids, thereby affecting the separation efficiency. Generally, the size of the collection bag can be estimated through the following steps: – **Estimate the separation area**: Determine the required separation area based on the flow rate and separation efficiency. - **Calculate the volume**: Then, based on the estimated separation area and the desired residence time (the time the liquid stays in the collection tank during the separation process), calculate the required volume. - **Determine dimensions**: Finally, based on the design and layout constraints of the tank, determine the specific dimensions of the sump (diameter and length). In practical applications, many designs also take into account relevant industry standards or specifications, such as API 650 or API 12J; these standards provide specific requirements for the design, manufacturing, and testing of tanks used in the oil and gas industry. If there are no specific standards to refer to, reliance is usually placed on the experience of design engineers and data from similar projects. At the initial design stage, it is advisable to consult with manufacturers or experienced engineers, who can provide examples from previous projects as references to ensure that the design of the water collection tank is both economical and effective. .

Also, I would like to know how the liquid level height is determined; please give me some advice!

Reference can be made to the \"Petroleum and Chemical Engineering Design Manual\", page P623, SH 3009 - 2013. For the setting of liquid level heights, HG/T 20570.8-1995 applies. The following excerpts are from the Petroleum and Chemical Engineering Design Manual regarding the settings for demisters: 3. The diameter of the demister tank is determined based on the flow velocity of the heavy liquid (usually water), taken as 0.025 m/s (or with a residence time of 5 minutes). 4. Under normal circumstances, the diameter of the reflux tank ranges from 1200 to 2400 mm; the diameter of the demister tank should be at least 400 mm. If the diameter of the reflux tank exceeds 2400 mm, the diameter of the demister tank should be at least 600 mm. 5. The length of the demister tank should be 1.5 to 3 times its diameter, which facilitates accurate control of the liquid level using instruments

Thanks for sharing; I’ve learned some knowledge.