10 hp pump for a slide on new vinyl liner pool

Jump to latest Follow Reply
Garfield said:
The pump is currently in a barn that's 1/2 mile down a mud road so if it dries a little I will look closer at impeller size. That's good info.
Click to expand...
Also check if there is a model number stamped on the wet end housing.

Also, regarding the vent, if the connection can be closer to the MD, then you don't need to use as large a pipe. The only reason for the larger pipe is to minimize the head loss between the drain and the vent connection. Once you figure out what pump you have, the plumbing layout, we can estimate flow rates and appropriate design for the vent.
 
I would use at least 10" PVC pipe to keep the head loss low and the water velocity below 6 feet per second.

The head loss should be kept below 1' unless you can put the pump lower.

If you can find the model of the pump, you can look up the actual performance curve from the manufacturer.

1680020370855.png

1680020422248.png
 
The MD grate is only 2' below the surface? Why so shallow? Having it deeper reduces entrapment risk.

But you can connect the vent right at the MD. It does not need to be completely vertical.
 
Last edited:
I was thinking it would be easier to put it in the steel part of the wall and also would not need the expensive main drain setup. The straight part of the wall on a vinyl pool is not 42 inches but i assume i need to stay away from the bottom. How do i seal a large pvc pipe to the vinyl pool?
 
What about the side of the pool near the bottom? How deep is the deepest part of the pool? Do you have a drawing of the pool profile?

2' is way too shallow for this amount of flow rate.
 
You can use multiple main drains such that the total flow does not exceed the combined ratings of all drains.

Just manifold them all together into a 10" T.

You might need 10 drains depending on the total required flow.

www.pentair.com

StarGuard Main Drain

New StarGuard Main Drains comply with provisions of the ANSI/ASME A112.19.8-2007 standard and the Virginia Graeme Baker Pool and Spa Safety Act. High quality StarGuard Main Drains are available in white, black, gray, and dark gray as well as a variety of configurations to fit any residential...
www.pentair.com www.pentair.com


 

Enjoying this content?

Support TFP with a donation.

Give Support
JamesW said:
You can use multiple main drains such that the total flow does not exceed the combined ratings of all drains.
Click to expand...
That is what I was thinking as well but I don't think you need so many. At most, that pump will be delivering 500 GPM and if you keep each suction pipe below 6 ft/sec, you only need 4x3" lines each with a MD pair. And if you line them up close to the transition, it would be safer.
 
It's not realistic to put this slide on a residential 20 x 40 pool.

The people will probably be going too fast coming out of the slide and they will end up hitting the far wall or shooting out of the pool with serious injuries.

You really need a licensed engineer to design the project and tell you if this can even be done safely.

Besides the suction, you need to address the "Diving Envelope" to make sure that the water area and depth are sufficient.

Shooting people at 50 miles per hour into a pool is very dangerous.

You also would need a spotter to ensure that the landing area was free of swimmers or you will be crashing people into each other and causing serious injuries to several people at the same time.
 
  • Like
Reactions: proavia, 1poolman1 and mas985
Garfield said:
It was on a 4 feet deep pool that was 24 feet to the far wall.
Click to expand...
Do you have an engineer's certified design for the original installation to prove that it was designed, installed and operated safely?

In any case, you should have an engineer design the current installation for safety.

Are you getting a permit for this pool and slide?
 
You can't just poke a pipe through the wall.

The suction has to be certified to APSP-16-2017 or designed by an engineer and approved by the local inspector.
Garfield said:
I talked to an engineer friend and he suggested putting a 16 inch ( to lower velocity) pvc pipe out the side of the pool with appropriate grating that would then go to a vent above grade about 10 feet out then reduce to the 6 inch that feeds the pump.
Click to expand...
What type of engineer?

Electrical, aeronautical, structural, mechanical, geotechnical, chemical or the type that drives a train?
 
Last edited:
Garfield said:
Does anyone know how I would seal that 16 inch pipe coming out of the vinyl pool?
Click to expand...
The relatively thin metal sidewalls of a vinyl pool are literally the structure that holds all that water in. Putting a hole that large in the wall would require engineering. You might contact the pool manufacturer about your plan. Likely they will advise against it, but you never can tell.
 
  • Like
Reactions: Garfield
First, you don't seal the pipe, it is the drain that has a gasket which seals to the vinyl surface. However, you may not be able to find a drain that large that will work with a vinyl pool surface. You will probably need to use multiple MDs like this:

Hayward VGB Main Drain for Vinyl or Fiberglass Pool, 2", White, Set of 2 - WG1049AVPAK2 - INYOPools.com

Hayward Vinyl/Fiberglass Main Drain 2" (2-Pack) WG1049AVPAK2
www.inyopools.com

These are rated at 125 GPM each so if you used 4x3" lines with a MD pair on each line, that is 8 MDs total and should easily handle 500 GPM. The four lines would come together in a manifold with the vent line connected close to the MDs and the pool wall. 6" line from that point to the pump. You really don't need a 16" line if done properly.
 
  • Like
Reactions: Garfield

Enjoying this content?

Support TFP with a donation.

Give Support
You must log in or register to reply here.
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.
Top Bottom
Back
Jump to latest Follow Reply