Pump Selection - Circulation Pump 1

[MorrillB]

Hi,

I'm in the process of building a Water Channel for a Lab experiment, and was looking into pumps for recirculating the water with a variable flow control. Something that i could possibly have a display with or code into a program with. It also has to be submersible. Just looking for tips on which company to go after for best results/best prices. The water channel doesn't have dimensions or volume yet, so specific selection isnt neccessary at the moment, we just want ideas on prices/capabilites of our pumps needed.

Thanks.

If you have any questions please let me know.

 

[MorrillB]

Scratch this, were going with a propelled shaft attached to an exterior motor

 

[LittleInch]

You might want to consider a screw pump allied to a variable speed motor, just depends on the flow range you are looking at. You might need two in paralel for a large turndown. Screw pumps will give you a pulsless flow and if you take a tap off the shaft can give yuo a flow based on screw speed. Most would need to be above water, but suck up liquid no problem. Making it submersible does add to the cost, but for a small size may be not too much.

Otherwise an axial flow (propellor type) is probaly best for what is likely to be a high flow / low head type of pump, but direct flow numbers are more difficult - you would need some sort of meter in the discharge pipe - utlrasonic clampon works weel but need some stright sections or a flow striaghtener.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[Artisi]

Well, if and when you can come back with something constructive, there are plenty of people here who are more than willing and capable of helping, but one thing we aren't is clairvoyant. Something like 10 l/s at 3 metre head or 1000l/s at 50 metre head would be a good starting point.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)