Reduce Pressure of a liquid stream
Reduce Pressure of a liquid stream
(OP)
I need to reduce the pressure in an existing 1" line to 1bar before it enters a column (feed). The source of the stream is at 20 bar. We have a iso container available to use as a buffer.
Are there standard reducers available?
Are there standard reducers available?





RE: Reduce Pressure of a liquid stream
RE: Reduce Pressure of a liquid stream
We might not be able to use pumps and therefore the 20bar driving force will need to be sufficient to overcome the resistance in the line.
However we will still need to manipulate the pressure of the line before it enters the column. And if there is flashing, it will be some of the oxygenates which we want to take off at the top of the column.
Think i've just got my answer
RE: Reduce Pressure of a liquid stream
I don't understand your problem. The pressure will reduce itself flowing through the line and into the distillation column which operates just above one atmosphere.
That must be one heck of a long line if it takes 20 bar to overcome the flow friction ... or else the line is just much too small, in which case you are going to have erosion problems!
Milton Beychok
(Visit me at www.air-dispersion.com)
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RE: Reduce Pressure of a liquid stream
If you control flow then the pressure drop will be whatever it is at that flow.
RE: Reduce Pressure of a liquid stream
In your case you have a downstream "pressure setter" i.e. then column. This means that you will get whatever flow the dP from your source to your termination will "create". Insert an obstruction (orifice, valve whatever) and you get less. Insert a flowmeter and a regulator and you can limit your flow to a specific flow rate. The downstream pressure is set by your column - assuming that it can handle any flow rate that you deliver.
Best regards
Morten
RE: Reduce Pressure of a liquid stream
Look at the architecture of the column and verify that the nozzle is not directed at something expensive and/or difficult to repair. You want the 2-phase flow to go in to free volume so it can slow by friction instead of by impacting upon a target.