# Thread: Is it possible to gage the....

1. ## Is it possible to gage the....

Gals per hour capability of a pump by looking at the label?

Mine has one listing different types of flow rates.

I am trying to calculate the exact amount of time i need to run my pump each day in order to filter 14100 gals of water.

Any help is greatly appreciated...Bo

***Edited to insert correct pics of pump label ***

2. ## Re: Is it possible to gage the....

What horsepower is it? I don't see any useful info in those pics.

3. ## Re: Is it possible to gage the....

Pumps are rated with a curve. You select the head of the system and then look at the appropriate curve for your pump and read GPM.

Head can be calculated, but it requires measuring the vacuum on the inlet side of the pump.

It's easier to just start with 8 hours a day and adjust as needed to keep the water looking good while minimizing run time.

4. ## Re: Is it possible to gage the....

There's a label right above the A.O. Smith label. What does it say?

5. ## Re: Is it possible to gage the....

Try this...

Get a five gallon bucket and have someone hold your vac. hose over your return. Be sure that you are getting 100% of the flow from the return. Then, with a stop watch, time how long it takes to fill the bucket.

Example, If it takes 10 seconds to fill the bucket, your pump is pumping 30 gallons per minute. (10 seconds will divide into one minute 6 times. Thus, 6 X 5 gals. = 30 GPM) Multiply that by 60 and that will give the the GPH. In this case it would be 1800.

Get it?

6. ## Re: Is it possible to gage the....

Originally Posted by woodyp
What horsepower is it? I don't see any useful info in those pics.
Woody...that is a Waterway 2 speed, 2 HP pump...i am not sure but the pic above lists two RPM's...one for each speed...i think.

Bama...here is a pic of the label you mentioned.

Thanks...Bo

7. ## Re: Is it possible to gage the....

Originally Posted by tmyers
Try this...

Get a five gallon bucket and have someone hold your vac. hose over your return. Be sure that you are getting 100% of the flow from the return. Then, with a stop watch, time how long it takes to fill the bucket.

Example, If it takes 10 seconds to fill the bucket, your pump is pumping 30 gallons per minute. (10 seconds will divide into one minute 6 times. Thus, 6 X 5 gals. = 30 GPM) Multiply that by 60 and that will give the the GPH. In this case it would be 1800.

Get it?
Actually that makes total sense...thanks.

8. ## Re: Is it possible to gage the....

I just used MAS985's spreadsheet/table...used the PSI2GPM tab...according to it, using the lower of the two RPM's listed on the label above (1750/low speed RPM) and the average PSI my filter PSI gauge reads during operation (5 PSI, i clean it as soon as it hits around 6)...the result of that is 45.18 GPM...i rounded it down to 40 GPM to be safe and that comes out to one turn over every 6 hrs for a 14,100 gal pool.

MAS985's GPM calculator is located here: http://www.troublefreepool.com/post6544.html#p6544

I think I'll start there and adjust as needed.

Thanks...Bo

9. ## Re: Is it possible to gage the....

Actually that motor is a BN37 -- based on the current draw and it is a 2 spd... According the AO Smith Catalog is actually a 1 horsepower motor-- I have the same one on my Hayward and get about 36 to 40 GPM also

10. ## Re: Is it possible to gage the....

Originally Posted by dremin2flyhi
Actually that motor is a BN37 -- based on the current draw and it is a 2 spd... According the AO Smith Catalog is actually a 1 horsepower motor-- I have the same one on my Hayward and get about 36 to 40 GPM also
Dang...so that sticker with the " HP 2.0 SPL" does not mean 2 HP?

I bet my rookie butt payed for 2 HP when i got the pool...

Thanks...Bo

11. ## Re: Is it possible to gage the....

You may have paid for a 2 HP, but it would have cost you more in electrical usage. Think of it as an investment that saves you money down the road. (Trying to make lemonade out of lemons). LOL

12. ## Re: Is it possible to gage the....

Originally Posted by bobodaclown
You may have paid for a 2 HP, but it would have cost you more in electrical usage. Think of it as an investment that saves you money down the road. (Trying to make lemonade out of lemons). LOL

Thanks Brotha!

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