4 replies to this topic

[titim]

Hi everyone,

I have Somme questions:

i need to calculate the pressure of 2 fluids( gas , gas and liquid) coming from the top of column (60m) to an air cooler (20m), are the pressure increases or decreases for both of liquid (gas, gas liquid) and why.

thanks

Edited by titim, 27 April 2015 - 09:50 PM.

[shan]

The fluid pressure will increase because of 40 m (60 m - 20 m) gas head or gas/liquid head.

[PingPong]

Is there gas plus liquid coming from the top of the column? What kind of column is that?

 

Nobody understands this without a drawing and more info.

[titim]

hi

no, only a gas, it comes from  the top of a crud distillation column ( the top of 60m of height) and go to to the air cooler (20m), a condenser, and finely a drum to separate a gas from a liquid.

 

 

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Edited by titim, 27 April 2015 - 10:02 PM.

[PingPong]

There will be some frictional pressure drop over the lines between column and aircooler, between aircooler and watercoolers, and between watercoolers and drum.

But there will be some pressure gain due to staic pressure of the mixed phase (gas+liquid) between between aircooler and watercoolers, and between watercoolers and drum.

 

You would need to do calculations to know the exact numbers, but normally the piping pressure drop would be in the order of 0.1 bar.

 

The pressure drop over the aircooler and over the watercoolers will however be by far the biggest factor in the pressure difference between column top and drum.

 

If this is an existing system you should be able to obtain column top pressure and drum pressure from the DCS.