Scrubber

[Joshua Wilcox]

Alright so I have 95 percent of the scrubber parts speced out and selected. Sadly though I am having a hold up. I was hoping someone knew a thing or two about tricking pumps. I need a pump that can do a variety of ranges of psi's at gallons per minute. 

I have a specific nozzle that produces a mist like stream at; 10psi, 3gpm to 80 psi 8gpm with approximately 15ft head pressure. I need to hit both of these and a couple ranges in-between. There was some concern raised about using a metering pump because of their pulsing during operation and not being the best at running on a continuous long term cycle. Since this pump will be operating in a high flow low volume environment I was hoping for a self priming variant.  

A brief note about pump physics. So as your gpm decreases your psi increases. Kind of like when you you put your thumb over a hose line. How much effect will psi have on gpm delivery? Would it be best to spec for the high end and hope to dial it back enough with a valve? Or should I shoot somewhere in the middle of the two extremes? 

Shoot me back with any information you might have. Here is the nozzle spec sheet, the model number is WL6. Let me know if you have any information which could help me get this final part of the puzzle solved. 

http://www.bete.com/pdfs/BETE_WL.pdf

Joshua M Wilcox

[Luslugger]

Look at "procon" pumps.  use an inverter on the electric motor to control gpm, procon should have pressure setting built in
Bob S.

[2600]

I'm not an expert on pump physics, or interpreting specs, but I'm with him on this. 

Use a mechanical regulator to control pressure, one that spills excess fluid volume back into the reservoir through what's usually called a bypass valve. Then control flow volume with the speed of the pump's rotor. 

You could still experience problems at extreme combinations of low pressure/high volume or high pressure/low volumes.  Impeller pumps rely on centrifugal forces, and can stall out at low speeds. A vane pump is good at maintaining pressure at low speeds, but the vane's edges are a wear risk at high speeds. 

A link to a good tutorial on pump design would be a handy thing to have right now. The relative size of the nozzle's opening to the desired rate of flow matters, too. 

73

On Sunday, February 17, 2013 11:35:03 AM UTC-5, Joshua Wilcox wrote:

[Luslugger]

What fluid or chemical will be in this pump?  What does the holding tank look like?  What is the tank position to the pump? Are you trying to spray a liquid into a gas flow?  How much time is required for the chemical action to complete?
Bob S

[Joshua Wilcox]

Water, no holding tank continuous cycle, 15ft below nozzle, nozzle handles spraying more like a flood action, building machine to measure reaction time. 

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