How to Select an Inground Pool Pump
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- čas přidán 28. 08. 2024
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Airport Lounge Kevin MacLeod (incompetech.com)
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Let’s start with the gallons. There are calculations available for each shape. Here are a few common examples.
Rectangle - Length x Width x Average Depth x 7.5
Round - Diameter x Diameter x Average Depth x 5.9
Oval - Longest Diameter x Shortest Diameter x Average Depth x 6.7
Kidney - Length x Avg. Width x Avg. Depth x 7.0
A real example will help us moving forward. Let’s say the pool is a rectangle that’s 16’ wide and 32’ long. The deep end is 8’ and the shallow end is 4’. To get the average depth, add the deep end and shallow end depths and divide that total by 2. This gives us a 6’ average depth.
Now let’s plug those numbers in and calculate our gallons. 32’ long x 16’ wide x 6’ average depth x 7.5 equals 23,040 gallons.
The goal of any residential pool is to turn over the body of water once a day. The time it takes to turn the water over is known as the turnover rate. A standard turnover time is 8-10 hours. We will use 8 hours for our example.
Once you know the gallons and turnover rate, you can calculate the gallons per minute required to accomplish desired turnover rate.
Step One - Gallons (23,040) divide by Hours (8) = GPH (2,880)
Step Two - GPH (2,880) divide by 60 = GPM (48)
Next we will determine Total Dynamic head of your plumbing system . The TDH is the measurement of resistance working against your pump as it pulls water from your pool and then pushes it through your filter and back to your pool. The higher the dynamic head the larger the pump and pipe you will need to offset the pressure.
Elements that affect your dynamic head are:
-Pipe size (1-1/2” or 2”)
-The length of pipe horizontal pipe
-The rise of the water.
-The turns in the pipe 45 and 90 degree
-Valves and couplings
-Pool equipment, i.e. filters, heaters, eyeballs.
Keep in mind that the plumbing will determine your maximum flow rate. For each 1.5” intake line, the maximum flow rate is 51 gpm. Each 2” intake line can handle up to 84 gpm
We’re finally to the point where we can use the gallons, turnover rate & feet of head to select the HP of the pool pump. Each pump will have a correlating pump curve. This pump curve will point to the correct HP.
This chart is easy to use. The feet of head is listed along the y axis and the gallons per minute is listed along the x axis. The point at which the two lines intersect will correspond with a particular HP. If it falls between two different HP lines, go with the higher of the two. Otherwise the pump will not be strong enough for your turnover rate.
In our example, the 48 gpm line and 60’ of head line meet right below the 1.5HP curve. So the 1.5HP pump work for our example. Now, this pump curve pointed to 1.5HP but the HP will vary from model to model so make sure you look at the pump curve of each one.
We’d like to say that once you’ve found the correct HP for your pump that you’d be done but lets pump the brakes a little bit. There are still three different types of pumps to choose from. You have single speed, dual speed and variable speed pumps. Let’s start with a basic overview of each type.
Next up is the dual speed pump. This pump operates at two speeds; 3450 RPM and 1750 RPM. This pump has a more expensive up front cost but it can also save you up to 50% on operational costs over the single speed pump. This is due to the pump pulling lower amps when it’s in the low speed. Another benefit to running it on low speed is that it is very quiet.
Finally, we have the variable speed pump. This pump can operate at a full range of speeds from 600 RPM to 3450 RPM. It has the most upfront cost but it is by far the least expensive pump to operate. This pump is great for situations where you have water features or an attached spa. You can run the pump at a low RPM to circulate the water, then kick it up a little bit to run a waterfall and then kick it all the way up to a higher RPM to run the message jets in the spa. For more information regarding the differences between these pumps check out our blog.
you guys are great thank you!
Fantastic videos! Thank you for simplifying this process!!
Hi guys. I love watching your videos they are so helpful and easy to understand. Thank you guys
Thank you brofessor, 🤣😂
Cool, Thank you
How do we choose between pumps marketed as in vs above ground? I have a 12x28 inground but most properly sized pumps for my size are listed as above ground. If the max head on an above ground pump is between the 50-60 head ft needed for my pool, would those above ground 1.5hp/50 head pumps be correctly sized? 1.5" lines existing.
It's not really marketing; it is more about the pump's abilities.
Inground pool pumps are installed above the pool's waterline. Because an inground pool pump is above the pool's waterline, it needs to be able to draw water up through the pipes without assistance; that's called a "self-priming pump." The pump must overcome gravity plus the resistance of the plumbing lines' configuration to prime itself. Besides impeller size, the diffuser is one of the major keys for inground pumps being able to self-prime; above ground pumps do not have a diffuser, and most can't self-prime.
And I've never seen an above ground pool with an actual feet of head above 20 to 25. They may exist, but I have yet to see one. Above ground pool pumps are generally installed below the pool's waterline and have much shorter plumbing lines. Being installed below the waterlines means the above ground pool pump is gravity-fed and doesn't need to overcome gravity and other forces to prime itself.
What would be the calculating formula for an L shaped pool?
You would have to use the Rectangular pool formula and add the two rectangles together.
Great video guys except for the audio. It is way too low. I have it on max and it's hard to hear you guys, and no my hearing is not bad
Hello I have a question . My pool pump turn on and then after like 20 minutes turns off and sometimes works fine what can it be ? Thanks in advance
Great video! Congrats!... What is the average pipe size for a standard rectangular house pool?
Hi Salvador, an inground pool can use pipe sizes ranging from 1.5" inches (40mm) all the way up to 3" inch (80mm). It all depends on how big your pool is and how quickly you need to move the water. 2" inch (50mm) is a very common plumbing size among inground pool pumps.
Guys, my lacrosse filter is leaking through the new lid and ‘o’ ring . I’m presuming it’s the thread on the filter. What can I use to fix this. Can’t buy a part for a new thread. Is there something that will sort this problem,
Great vid, very informative.
I have acquired a pool with the recent purchase of my house. Not sure on how the plumbing is run. Also, the pool is an odd shape. I would like to change the sand filter to a canister in the process of changing the pump. So.... with all of the unknowns, how do I go about sizing my pump? Is too big of a pump a problem besides the increase in the electric bill?
Too big of a pump could be an issue if the plumbing and filter can't handle that increase in flow. I'd suggest going with a variable speed pump. You can't oversize that style of pump because the speeds can be reduced to your needs. Plus, it is the most energy efficient option by far.
@@Inyopools does it do this automatically or do you have to set it? If you have to set it how do you go about doing so?
My pool is only 3000 gallons. What do I do?
Hello I have an 8 ft deep pool that I want to add a waterfall to. Thing is that I do not want to run the waterfall thru the motor. I would like to use a smaller motor so that I can take it on and off whenever I feel like it. What type of motor would you suggest? I was looking at the intex pumps for above ground pools. Would they be powerfull enough? Thank you.
An Intex pump is probably not going to work very well. You should look into getting the aptly named "Waterfall Pumps. These are usually inground pool pumps that have been modified to remove the pump strainer basket.
What is the size of your waterwall? Width wise. - MGS
Is it worth going with 2.5" pvc plumbing for 40,000 gal pool or is 2" more then enough?
There are advantages to going with the 2.5". Larger pipe size can handle faster flow and provides lower resistance. This will lower the overall pressure in the system. My pool is only 10k gallons and I have 2.5" on the suction side and 2" on the return side. They put larger pipe on the suction side to make sure the pump gets plenty of water and doesn't cavitate.
Good morning! I have a question about my pool pump and filter system, We have the Magnum Jacuzzi pump, which by the way it's really old, now, We want to change the pump to a more update it one, We're looking at the Hayward Tristar Max Rate 1.5, but We don't know if it'll match with our cartridge filter? our pool is 15X30, 20,000g. any help would be gratefully appreciated. thank you.
+Lari Rosa I see you messaged our facebook page as well, so I will carry that convo over to youtube. Basically with your style single cartridge filter and the lack of water features or high head pressure, I would replace your old pump with the same Jacuzzi Magnum 1.5 HP. If you want to get away from Jacuzzi, You should consider the Hayward Super II or the Pentair Whisperflo
Jacuzzi Magnum 1.5HP: www.inyopools.com/Products/02501126000326.htm
Hayward Super II 1.5HP: www.inyopools.com/Products/02201157001155.htm
Pentair WhisperFlo 1.5HP: www.inyopools.com/Products/03501124000129.htm
It would be better if you could have add some more details about calculating TDH
Check out our blog on calculating feet of head: www.inyopools.com/Blog/how-do-i-calculate-feet-of-head-for-my-pool/
Can anybody advise about horse power and what is best for what?
The video pretty much covers that, but can you be more specific? What are your specific application requirements?
Good basic information, HORRIBLE delivery.