How big of a return pump do I need?

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workhz

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Not sure head height is a minor loss or maybe it’s more for DC pumps or something just odd with my pump.

On my tunze 1073.050 (on a 90 gallon) is rated at about 800g/h. At a head height of 1.5M, the graph shows I lose about 40%. Don’t think that’s minor.

My stand is 39” tall plus the tank is 24”. Pump is about 6” off the ground and return is maybe 1” below top of tank so a 57” head height. Don’t think it’s that unusual of a set up.

Is this type of loss more a DC motor thing or do the AC motors have as significant of a drop?
 
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KStatefan

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Not sure head height is a minor loss or maybe it’s more for DC pumps or something just odd with my pump.

On my tunze 1073.050 (on a 90 gallon) is rated at about 800g/h. At a head height of 1.5M, the graph shows I lose about 40%. Don’t think that’s minor.

My stand is 39” tall plus the tank is 24”. Pump is about 6” off the ground and return is maybe 1” below top of tank so a 57” head height. Don’t think it’s that unusual of a set up.

Is this type of loss more a DC motor thing or do the AC motors have as significant of a drop?

Yes there is siginafint drop with an AC pump. Is is all in the design of the impeller and volute. When you add a manifold the head loss could be minor compare to the friction loss thru the piping and reactors.

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Quietman

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DC Centrifugal pumps will still have pump curves. At 1/2 max height the Vectra M1 pumps less than 50% of max rated flow. I also have the Tunze 1073.05 and it does as well.

This characteristic is common to all centrifugal pumps (which is what we use for return pumps). The impeller design can result in a high pressure pump (which can pump at a much higher pressure (relative) but flow will drop off rapidly or high flow/low pressure or something in between. All of these can be useful to us depending on what's needed. See the below pump curves for Iwaki to illustrate the difference using same motor. Z being high head, X being high flow compared to standard which is in middle.

Iwaki 30 curve.PNG


The dosing pumps we use are typically positive displacement pumps which have no shut off head and require relief valves (internal/external) or other methods to prevent damage to systems. These have slower flow rates.
 

rusty hannon

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I am planning for a 150 gallon tank. Since return pumps should be 5-10 times per hour, I would search for a 1,500 gph pump. If I wanted to plumb in a manifold for three future add-ons (reactors, etc), do I need to increase the return pump gallons per hour for the requirements of the add on? Let me know if my question is poorly worded and I'll clarify.
We base our choices by turning tank over 10 x per hour if seahorses 20 x per hr
 
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