Seeking help with a problem related to separating water from liquid hydrocarbons

Does the poster have a two-stage water cut-off setup, or a single-stage one? If it is a secondary water cut, just check the liquid level in the water cut tank. If it is a single water change, it is recommended to wait for 24 hours or more; safety should also be considered during the water change.

Generally, a settling time of 2 hours is sufficient for liquefied hydrocarbons.

What is primary dehydration and what is secondary dehydration?

Generally, liquid hydrocarbon storage tanks need to remain stationary for more than 2 hours to remove water, but if the feed rate is less than 4 meters per second, our operational experience shows that stationary conditions can be achieved in just one hour. Since the density of liquid hydrocarbons differs significantly from that of water – with the density of liquid hydrocarbons being around 600 – they settle relatively quickly. Additionally, due to the poor miscibility between liquid hydrocarbons and water, a settling time of 1 hour is sufficient to achieve the desired effect. Of course, if the density difference from water is small, it is recommended to extend the resting time appropriately. In my opinion, as a plant technician, it is essential to learn and follow the standards, but there should also be a willingness to explore practical situations in certain operations.

Primary dehydration involves directly cutting off the water flow through the valve at the bottom of the tank, while secondary dehydration entails using a separate water-cutting tank, with dehydration taking place at the bottom of that tank

So, if an automatic dehydrator is used for liquefied hydrocarbons, is there only secondary dehydration and no primary dehydration?

We don’t have a water cut-off device; usually, after it comes to rest for 3-5 hours, the water is drained directly through the drain at the bottom of the tank: lol