Is my math for tank turnover from Vectra M2 pump okay ?

[Idech]

I want to calculate tank turnover and I know I can use a bucket and count the time for water to fill it but I’m not going to to that right now.

I want to know if my math makes sense. Even if it’s a little off, it will give me a very good idea of tank turnover.

So here it is :

• Head pressure : 4 feet in the stand and tank + 4 x 90 degree elbows at 1 foot per elbow = 8 feet of head pressure
• 8 feet of head pressure = 1150 gph (see graph below) at the pump maximum speed
• Max speed of pump after calibration = 10/12 lights on the dial or 83%
• 83% Vectra x 1150 GPH = 954,5 GPH
• Regular running setting on Vectra = 5/12 lights or 41,7%
• 954,5 GPH x 41,7% = 398 GPH
• 398 GPH / 145 gallons tank + sump = 2,7 turnover

From Ecotech. I drew a line at approximately 8 feet and result looks like 1150 GPH.

Am I right ?

Thanks

 

[REEFRIED!]

Your math seems right but I don’t believe an elbow is equal to 1’ of head height.

 

[Idech]

Your math seems right but I don’t believe an elbow is equal to 1’ of head height.

That’s what I read online. https://support.ecotechmarine.com/hc/en-us/articles/215339608-How-do-I-calculate-head-pressure-#:~:text=Every vertical foot of distance,1 foot of head pressure.

How much do you think ?

eta : here they say 0.5 head pressure with 1 inch pipes (like I have)

How to Estimate the Head Pressure on Your Return Pump - Simplicity Aquatics

Most pumps are listed with GPH (gallons per hour) flow rates to give you an idea of how much water they will move, however this number is with zero head pressure. In reality, most aquarium return pumps have a good amount of head pressure against them, so the flow rate at zero doesn’t necessarily...

www.simplicityaquatics.com

I also have an online UV to account for (I counted it as 2 x 90 degree elbows)

It’s still around 8-9 feet of head pressure.

 

[Auntjemimma]

That’s what I read online. https://support.ecotechmarine.com/hc/en-us/articles/215339608-How-do-I-calculate-head-pressure-#:~:text=Every vertical foot of distance,1 foot of head pressure.

How much do you think ?

eta : here they say 0.5 head pressure with 1 inch pipes (like I have)

How to Estimate the Head Pressure on Your Return Pump - Simplicity Aquatics

Most pumps are listed with GPH (gallons per hour) flow rates to give you an idea of how much water they will move, however this number is with zero head pressure. In reality, most aquarium return pumps have a good amount of head pressure against them, so the flow rate at zero doesn’t necessarily...

www.simplicityaquatics.com

I also have an online UV to account for (I counted it as 2 x 90 degree elbows)

It’s still around 8-9 feet of head pressure.

If you're running UV then I believe you should be adjusting the GPH to match the rating for the unit. For example my 25w AquaUV should have about 800gph-1200gph running through it as seen here in the instruction manual.

 

[Idech]

If you're running UV then I believe you should be adjusting the GPH to match the rating for the unit. For example my 25w AquaUV should have about 800gph-1200gph running through it as seen here in the instruction manual.

Yes, I have done that.