10 hp pump for a slide on new vinyl liner pool

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You have three phase power to your home? They do not make VFD's for 220V big enough (15 hp min.) to drive that motor.

I stand corrected. You can get a 15 hp VFD on amazon for $1500. It needs a 50 amp circuit
 
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Darin said:
You have three phase power to your home? They do not make VFD's for 220V big enough (15 hp min.) to drive that motor.

I stand corrected. You can get a 15 hp VFD on amazon for $1500. It needs a 50 amp circuit
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Would you really trust buying a 15HP VFD off Amazon 😂 I barely trust buying a pair of shorts from Amazon … 😏

This will be one of those “interesting threads” to watch …
 
Darin said:
You have three phase power to your home?
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They never said it was a three-phase motor.

Darin said:
They do not make VFD's for 220V big enough (15 hp min.) to drive that motor.
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They never said that it was a variable speed motor.

They said 15 HP corrected to 10 HP, 1765 rpm (Probably 1,725 RPM).

We need to see the motor label, otherwise, we are just speculating.

The diving envelope needs to be verified as a residential pool is probably not big enough to allow that slide.


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Ohh. Lets see, public pool, yes it would be three phase. A public pool would have three phase service. These are desinged to run efficiently and to not break down at public pool service.

JamesW, in order to start a 10 hp motor that is 3 phase you would need a VFD not specifically to change speed but rather to get it going off of single phase 220. When hooking up a three phase motor to single phase service you need to use a larger VFD by at least 50%. So to run a 10 hp motor you would need a 15 hp VFD. Some say 75% larger, but i go with 50%.

And yes Joyfulnoise i would buy a VFD off of amazon.

But i would definetly never do this at home. My pool is bigger than this one and holy moley this would skip me into the yard!!
 
Thank you everyone for all your replies. I’m an electrician so I know a bit about the pump and making it work. A person can use a rotary phase converter or a VFD or just switch the motor out to single phase. I don’t know the best way to pull this volume of water out of the pool.
 

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Garfield said:
I have gained a lot reading here. Thank you. I have a big slide that has a 15 hp pump with a 6 inch line I want to figure out a cost effective way to supply the pump safely. My ideas so far are to put in 4 main drains and gravity over to a sump well 9 feet deep then the pump for the slide pulls out of that or a large wall grate that extends above the top of the water line and make a stainless box that the pump for the slide pulls out of. I have not built this pool yet but want to get it ordered. It's a 20x40 rectangle. (Yes, I understand the danger of suction from a pump.)
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Have you designed the sump to safely handle the amount of water you require? A 10X9X5 sump would be empty in less than 3 minutes at 1200gpm and have to be replenished by another pump or gravity fed through very large gratings and plumbing that would pose a suction-entrapment hazard. Even 4 large drains would have to flow 300gpm each to maintain water at the slide pump. The current that would put into a 20X40 pool would move everything, including people, to those ports. That's enough to trap someone just in the vicinity of the drain/grate.
 
You need to figure out the water in transit that will be pulled out of the pool and on the slide when you turn on the pump. The water level in the relatively small pool may vary significantly when the pump is on or off. And that may effect the skimmer function.

What will be the depth profile of your 20X40 pool?
 
What is the expected velocity of people exiting the slide?

What is the angle that people will hit the water?

Can you draw a top and side profile of the expected water entry direction of travel as a person exits the slide?

Why do you need a sump?

Just put in enough suction grates at different points to provide enough flow.

As long as you are not exceeding the grate's rated flow rate, it should be fine.

I would use an 80% design for the loading of the grates.

So, that's a design flow rate total of 1,500 GPM.

For example, if the grates have a rated flow of 250 GPM, you would use 6 grates all manifolded together (6 X 250 = 1,500 GPM).

In any case, you really do not know the actual flow rate that the pump will produce or the flow rate that the slide is designed for.

Where did you get 1,200 GPM?

Are you just guessing or do you have a reference for those numbers?
 
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