Syanylvania need help to clarify doubt about: : How do you remove liquid from a vacuum vessel?
Provided that pressure remains low (below atmospheric pressure) and liquid be removed from vacuum vessel (say horizontal-oriented). Is there any specific device or valves to be used so that atmospheric pressure doesn’t hinder removal of liquid from vacuum vessel?
Try this:
Answer by mike1942f
Normally what are called vacuum vessels are vacuum walled vessels for temperature control and the interior is at atmospheric pressure.
But if you mean a true low pressure vessel, then to remove contents you have to use a pump against atmospheric pressure just as you did to remove the air and produce a vacuum. In one situation, the pump would be designed to handle both air and liquids. If one imagines a large steel vessel that is under “vacuum” because liquid was brought to a boil and allowed to condense, then the liquid could pumped out by a simple rotary pump as long as the place it was being pumped to was at the same pressure. Getting the receiver at the same pressure and the lines full of the liquid might be tricky, but once there, two valves on the vessel would be opened, the pump cranked, the low pressure liquid and vapor moved, the valves closed and the receiver removed.
In fact, now that I have written that, I see I don’t need a liquid pump – I pull a vacuum in the receiver (by heating and condensing or via pump) that is deeper than the one in the vessel, close the valves, attach the reciever to the vessel, open the valves and the receiver sucks the liquid out, lowering the pressure in the vessel.
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Gawd with the previous answers! It is called a PUMP, plain and regular. They are used all the time on power plants steam condensers, which are under a very tight vacuum.
That’s interesting..
ideas:
have a drain pipe section below the vessel, isolated by a valve several meters away (further distance give you more draining volume) and connected also to the vessel – for the purpose of creating a vacuum pressure equal to the vessel.
( so that we have a pipe with 3 connections: to vessel drain+valve, to vessel air space+valve,to open drain+valve ).
Now you can drain repeatedly the volume of that drain pipe. Figure out the procedure by yourself.