HELP PLEASE! Is my pump too small?

[scubasteeve]

Hi all.

I've been trying to figure out pump mechanics to do this on my own and my head is swimming in confusion.
I have a century HSQ095 0.95 HP SF 1.00 type B 3450 RPM pump that is pulling 9500 gallons of water from the bottom of three cylindrical tanks that are connecting with 2" pvc that feed into the pump. The pump then pushes this water back into a 2" pvc line that splits into each of the three cylinders and up vertically 12ft to the top of the tanks. Then the water is cycled through again, I have no filters. I just want to know how to calculate if this pump is big enough to cycle all the water through in an hour. The three cylindrical tanks total 9500 gallons. Is this pump too small and what size should I use? The three white tanks in the photo are my "tank".

 

[Texas Splash]

Welcome! Let's see if @mas985 can crunch some numbers for you.

 

[scubasteeve]

thank you!

 

[Newdude]

What is this setup for ?

 

[duraleigh]

Curious what the tanks are for, as well.

9500 gallons in an hour is 158/minute. You 1HP pump is likely producing around 50 gpm so it is not even close.

 

[denwood]

You'll need a 2.5 to 3.0 HP pump with 2.5" inlet/outlet at minimum to get those numbers. You can check the GPM/HP chart on this one for example: Waterway Viper 3.0hp 230v 2 speed pump - 3721221-1V

You could also likely get to those numbers with 3 of your .95 HP pumps in parallel.

I think you'll want 2.5" pipe at least to the pump.

 

[mas985]

Small pipe does not fundamentally "limit" flow rate, but it will reduce some for a given pump size. But I do agree that 158 GPM is not even possible with that size pump. It is probably beyond run out.

Hi all.

I've been trying to figure out pump mechanics to do this on my own and my head is swimming in confusion.
I have a century HSQ095 0.95 HP SF 1.00 type B 3450 RPM pump that is pulling 9500 gallons of water from the bottom of three cylindrical tanks that are connecting with 2" pvc that feed into the pump. The pump then pushes this water back into a 2" pvc line that splits into each of the three cylinders and up vertically 12ft to the top of the tanks. Then the water is cycled through again, I have no filters. I just want to know how to calculate if this pump is big enough to cycle all the water through in an hour. The three cylindrical tanks total 9500 gallons. Is this pump too small and what size should I use? The three white tanks in the photo are my "tank".

That is the information for the motor only. I would need the information about the pump (i.e. wet end). Do you have a make/model #? If not, post a pic of the wet end.

 

[scubasteeve]

thank you all! This is a salt water reservoir for replacing saltwater in large closed-system marine holding tanks. We pull water from underground and store it in these 3 cylinder tanks overnight, and overnight that water is chlorinated. We then neutralize the chlorinated water the next morning and use it to replenish our marine system tanks after a water exchange is done. We've been having some residual chlorine pop up in our water tests after the chlorine is neutralized and the pump is running for at least an hour or 2. It doesn't always happen but it's occurred enough for me to question if the pump is too small. I'd like to be able to cycle all that water through once an hour to ensure contact time with the chlorine-neutralizer (sodium thiosulfate) can occur thoroughly and we'll have water ready within an hour or so of prepping. Thank you for the link!

 

[denwood]

Ah, interesting application.

 

[1poolman1]

That 1/2hp replacement motor is most commonly use on a Hayward Super Pump or a Hayward Super 2.
A 3hp Whisperflow, with the right plumbing, is capable of about 160gpm.