6 replies to this topic

[canan]

Hi,

 

What type of flowmeter is suitable for a viscous liquid (>10cst @40'C) process stream line operating under vacuum (~50mbar). 

Flowmeter will be placed to the inlet of a "distillation column" and vacuum is applied from the "top product storage tank" of the column. Hence vacuum creates suction of liquid throughout the process, which means there is a "motion-driven flow" instead of a "pressure-driven flow". 

 

I have searched about coriolis flowmeters but since the pressure drop is too high for these flowmeters many vendors have trouble to give quotation. Is there any suggestions?

 

Thank you...

 

 

[breizh]

Hi,

Can you share with us a simple PFD or PID to better understand your project? Tell us the reason why you don't consider a pump to transfer the fluid to feed the column.

Waiting for your PFD/PID but already pessimistic.

Note: You mention a flow meter, how do you intend to control the flow?

 

Breizh 

[canan]

Hi Breizh,

 

 

 

Sure there is a transfer pump to feed the column and the flow will be controlled with this pump. 

 

How can I share a document in this platform. When I try to paste an image the system gives error "You are not allowed to use that image extension in this community"

 

But simply the system is vacuum distillation tower. We want to measure the feed rate.

 

Thanks  

 

 

 Genel PFD.pdf   50.95KB   19 downloads

 

 

 

Hi,

Can you share with us a simple PFD or PID to better understand your project? Tell us the reason why you don't consider a pump to transfer the fluid to feed the column.

Waiting for your PFD/PID but already pessimistic.

Note: You mention a flow meter, how do you intend to control the flow?

 

Breizh 

 

Edited by canan, 06 April 2023 - 01:38 AM.

[breizh]

Hi,

OK I misunderstood, sorry!

Did you check with Endress Hauser, they have a mass flowmeter which is a straight pipe Coriolis type? You can google the reference Promass 80 or 83.

To add a document :

Click on Edit Button  then Full editor Button , select your document and click on attach this file button 

Good luck and welcome to this forum.

Breizh  

[canan]

Hi Breizh,

 

I have already get into contact with emerson, krohne and a few more good companies. Unfortunately even straight tube coriolis creates a greater pressure drop than the process pressure. Do you have know how about ultrasonic flowmeters for these processes?

 

Thanks for your kind welcome...

[breizh]

Hi,

Based on my experience, I encourage you to contact E&H who is leading the straight-line technology.

Note: You need to consider all the system, not only he flowmeter but also the control valve (except if you use an inverter), the piping and ultimately the technology of the pump.

About ultrasonic flowmeter, it depends on physical properties of your fluid, you need to consult vendors.

You may consider non-intrusive flow meter, Doppler type. 

 

EDIT: you may want to contact a chinese supplier to get a second opinion and quick answer:

https://www.drurylan...al-flow-meters/

 

Good luck,

 

Breizh 

[Pilesar]

A solution is some situations would be a positive displacement flow meter. If pressure drop is a problem, the perhaps a positive displacement pump would provide the metering as well as the pressure drop solution. As long as you get repeatable values, the engineering units could be non-standard and measured in rpm or similar.