Low flow high pressure pump for pressure control

[KevinNZ]

Can someone please recommend a pump for the following duty

[ul]
[li]Water[/li]
[li]50 litre/hour[/li]
[li]pressure 60 bar[/li]
[li]Control of manifold pressure with VSD.[/li]
[/ul]

If it was higher flow and lower pressure I would be looking at a multistage pumps but I can not find one this small.

Thanks

 

[moltenmetal]

This is a simple metering pump duty, although the flow being nearly 1 L/min isn't too small at 60 bar. Any number of designs- packed plunger, triplex plunger (think pressure washer type), hydraulic double diaphragm, Hydracell style driven diaphragm etc. are available. A pump designed for boiler feedwater service will do the job.

 

[KevinNZ]

Not a metering job. The flow will vary and we just need to maintain the discharge pressure. I can not see how we can do this with passive displacement pump.

 

[micalbrch]

If you want to maintain the presure you must be able to vary the flow with a VSD. Why do you think you cannot do this with a positive displacement pump? Install a pressure sensor at the manifold, connect it to the VSD, program it (the VSD) and it will speed up or slow down the pump acc. to the sensor signal. Or do I misunderstand something?

 

[BigInch]

Sounds like you want something like ...

http://www.mthpumps.com/applications/jockey.html

 

[moltenmetal]

You can absolutely do this with a PD pump, and in fact at your flow/head combination there is no pump OTHER than a PD pump that has a hope of doing this.

You may need a pulsation dampener or expansion tank in the piping to facilitate tuning of your pressure control loop, depending on whether or not there is another gas pad or the like in the system. If it is a closed piping system with zero gas pad anywhere, pressure will respond VERY quickly to flow- perhaps faster than your loop can manage to control. Obviously a relief valve is also required.

 

[Pmatherne]

You can look at chemical injection pumps, I have had to do that before. It was a massive overkill, but we could not get the client to budge for a lower cost system we were proposing

Future PE Engineer
Pet project I am working on to help other engineers, not much yet hoping to get it grow as I learn more

http://www.peexamquestions.com

 

[bimr]

PD pumps are capable of infinitely variable flow rate adjustment by varying the pump stroking speed with:
• AC motor with frequency converter
• All other types of variable-speed drive

http://www.spx.com/en/bran-luebbe/pd-mp-process-pumps-novaplex-integral/