pumps and electricity

[cindre2000]

Hey,

I know with Sequence pumps, the pump curve chart shows electricity usage. As the pump gets more head pressure, the flow goes down, and do does the electricity usage. Is this true for just sequence pumps, or all external pumps, or all pumps?

 

[ChrisRD]

I don't know if it's true for all pumps, but I've seen this same trend with other aquarium pumps running on a watt meter (both submersibles and externals).

 

[Anonymous]

All pumps have similar curves for power draw.

Power={(Gallons per minute)*(head in feet)*(specific gravity)}/{3960*pump efficency}

The 3960 is a conversion factor to make the units work so the answer is in hp.

The actual shape of the performance curve and power curve is a function of the impeller design. Different designs will give flater performance curves, what is often reffered to a pressure rated pump. Other designs will give a more steep performance curve these are the "flow rated" pumps that have high flow at low head conditions with quick drop offs in flow due to head losses.

 

[Anonymous]

ditto. To be more specific, the 3960 is the number of watt in a horse power.

 

[Anonymous]

ditto. To be more specific, the 3960 is the number of watt in a horse power.

No, there are 746 watts in 1 hp. The factor is to convert from (gal-ft)/min to hp. All it does is clean up the units.

 

[Anonymous]

 

[Anonymous]

reference

http://www.cdph.ca.gov/certlic/occupati ... TPage1.pdf

 

[cindre2000]

Ok, cool. It is just a couple of people I have spoken to recently do not believe that pumps work like that and I was pretty sure they did.

 

[Anonymous]

Ok, cool. It is just a couple of people I have spoken to recently do not believe that pumps work like that and I was pretty sure they did.

Thiere is a reason why these people and I don't design pump for a living...

 

[Anonymous]

Ok, cool. It is just a couple of people I have spoken to recently do not believe that pumps work like that and I was pretty sure they did.

I should also state that this is for centrifical pumps only. Piston, bladder and other pumps all have their own governing equations. I worked for an industrial centrifical pump manufacturer engineering department for a few years.

 

[cindre2000]

I thought about designing a pump. But I think I will stick to modding already made pumps and building a vortech knockoff.

 

[Anonymous]

Impeller design can be tricky from what I am told.

 

[Anonymous]

Ok, cool. It is just a couple of people I have spoken to recently do not believe that pumps work like that and I was pretty sure they did.

Thiere is a reason why these people and I don't design pump for a living...

I am also mechanically challenged. If it's more complicated than a can opener I am out of my depth.