Vacuum pumping issue in the methanol tank. Urgent! ! ! !
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I have a question: if there is a methanol storage tank with a capacity of 200 cubic meters, and two filling pumps are used to pump liquid out at a rate of 120 cubic meters per hour, what level of negative pressure will develop in the tank within 10 minutes if the breather valve fails and cannot allow air to enter at the start of filling? Before filling, the storage tank is at rest, with no liquid entering or leaving it, and the exhaust pressure of the breather valve is around 1 KPa. Thank you for the answer
Could you explain in detail how to calculate it? Hehe, I'm a newbie
First, check the design pressure of your storage tank as well as the negative pressure level. Also, determine what the suction pressure of your breather valve is; if the breather valve fails to function under negative pressure, it can pose a risk to the storage tank, causing it to collapse
Your question is a bit complicated; you need to know the original volume of methanol, the volume of the gas, and the temperature, and then use the Clapeyron equation to calculate the gas pressure resulting from the increase in gas volume due to the decrease in methanol volume.
This jar doesn’t seem to have a nitrogen seal. In such practical cases, theoretical calculations are not required; when sampling, simply remove the breathing valve to leave it open, and adjust the material feeding rate according to the pressure inside the tank. As long as it is not too close to the designed pressure, this method can still be used.