Small Volume, PD pump

The simplest application would be to specify a peristaltic pump.

http://en.wikipedia.org/wiki/Peristaltic_pump

The temperature and material limitations only have to deal with the flexible tubing. What is the discharge pressure required?

Regards, Delmar Schmidt
Melfi Technologies Houston
www.melfitechnologies.com

Delmar,

Thanks for the reply.

The discharge pressure will be variable - initially 2 to 4 psi until a given volume is attained, then increased to approx. 10 psi for a short burst of time/volume. Long life and near continuous use (over 8 to 10 hrs./day) are required.

Thanks,

Rockmon

1 to 10 psi isrequired.

A progressive cavity pump will do this job quite easily.You need to specify the discharge pressure and also the suction condition.This is a small pump but easily available from many manufacturers.If you need an offer let me know!

Regards

Chuck Cowlagi

Chuck -

Thanks for the reply.

The suction condition is flooded, at approx. 190 to 200 deg.F (heated supply tank ported directly to pump inlet). The discharge pressure needs to be variable - from very low pressure initially (2 to 4 psi) for a given period of time to deliver a fixed volume, then increased to approx 10 psi for a short burst of time & volume. I was hoping to control the volume/pressure through pump rotation speed changes. The inlet conditions would be approx. 1/2" supply (could be larger), and the outlet orifices (2 to 3 at this time) are approx. 1/8" dia. each.

I'm intersted in learning what's available, and at what cost. Currently, in prototype stages of design.

Thanks,

Rockmon

You haven't actually specified the flow rate - from the pipe dia you suggested ,it should not be more than 2 to 3 GPM.The liquid is water I suppose.

Since the pump does not "develop" pressure but merely overcomes the resistance to flow,given identical discharge conditions except higher pressure ( which is directly proportional to flow rate),all that you will need is extra flow rate to the tune of 3 to 4 times to observe 10 psi on the gauge.

In short the pump must operate at 3 times the initial speed when the sytem pressure is 3 PSI.

Small PC Pump can be run at full motor speeds of 1450 or 1760 rpm (depending on your power supply frequency 50 or 60 Hz).For low flow you may reduce the speed using a VFD(variable frequency drive) - down to 1/3rd the rated speed.Below this speed you will need special cooling for the motor.

Freeze your flow rate and you obtain the quote from a number of suppliers - I can help if you so wish from India!

Regards

Chuck

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