On the gas phase pressure equilibrium issue in the unloading of flammable liquids
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Is no air allowed at all when unloading flammable liquids (non-liquefied hydrocarbons)? How to balance the pressure inside the vehicle during unloading? What we encounter now is either connecting a balance pipe to the tank room, or directly using vacuum for unloading... Does a pump have that much power? And even with a balance tube, the amount of vaporization of a liquid with very low vapor pressure isn’t that large, right? For example, methanol, styrene, and ethylene glycol – vacuum unloading? Even the balance tube? Or what? ?
For this ethylene oxide, nitrogen is used to push it in; the liquid phase enters the storage tank and is then released from there. No pump!
The gas phase in the spherical tank can also be pressurized using a pump and then sent to a tank truck, using this pressure to force the liquid out of the tank truck