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

> 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

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

> 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

On Tue, Feb 19, 2013 at 7:57 AM, Luslugger <luslug...@gmail.com> wrote:
> 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

> On Sunday, February 17, 2013 5:37:26 PM UTC-5, 2600 wrote:

>> 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:

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

>>> Joshua M Wilcox

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