3 replies to this topic

[Subject_Name_Here]

I have two streams at controlled flow rates that will mix via an inline static mixer. Both streams will have check valves before the mixer, however, do I have to worry about fighting pressures in this situation? If the one stream is 40 psi and the other is only 20 psi, will the 20 psi line become motionless? Both lines will be fed by positive displacement pumps.

 

Also, does anyone have any recommendations for the type of PD pump if I'm pumping 50% caustic? I'm worried if I use a gear pump the caustic will eat the gears. Perhaps a lobe pump would suffice. Controlling the flow rate is key here, so obviously centrifugal and peristaltic pumps are out.

 

Thanks in advance!

Edited by Subject_Name_Here, 27 May 2013 - 02:11 PM.

[breizh]

Consider this resource for your application .

 

Hope this helps 

Breizh

[curious_cat]

How about an air operated diaphragm pump? Your pressures don't seem too high. 

[Subject_Name_Here]

Wouldn't a diaphragm pump give pulsating flow? I'm looking for a constant flow rate regulated by a control loop. How do you adjust the speed on a diaphragm? Via a timer on the air solenoid? I'd also be worried about the caustic eating the diaphragm itself but I suppose I could get one in epdm or nitrile.