Sealing solutions for media such as vinyl acetate, propylene, and ethylene glycol

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For pumping media with a low boiling point and flammability, what kind of sealing solution is appropriate? Seeing the recommended solution with an auxiliary seal, plan11 is used for flushing and plan52 for the auxiliary seal. The above applications are mainly in storage and transportation, where the pump inlet is at atmospheric pressure, the head is around 40 meters, and the medium is at room temperature. If a 52 auxiliary seal is used, the problems are as follows: 1. 52 is used for volatile, flammable, and toxic media; when these media are discharged directly from the top of the circulation tank to the collection system, they can enter that system. During normal operation, aren’t the leaks in gaseous form? 2. What is a good liquid to use for the auxiliary circulation? Each medium can be introduced separately. If anyone has experience using other sealing solutions, they can also share it.