Question about Hayward Sand Filter System & Tank 21" 1 1/2 Hp

# Pump Size How to Calculate

How do I calculate the pump size needed for me?

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Pump Size Calculation: Gauging the correct size for your water garden pump will ensure your pond receives the proper water circulation. Unless the pump you buy is already configured with a built-in fountain head, you'll need to calculate how much a pump can handle before you choose a certain size or model. A good rule of thumb is that pumps should be able to pump out about half the pond volume every hour. So a pump that moves 500 gallons per hour would be appropriate for a 1,000 gallon pond. In order to determine the size pump you'll need, you must calculate several key measurements.

Posted on Aug 27, 2008

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There are a number of online sites that have free calculators for pond keepers. Just google garden pond calculator. You will have to start with a pond volume calculator, once you know the approximate amount of water your pond holds, then use the other calculators to figure TDH (total dynamic head), friction loss, etc.
Hope this helps
Raincree

Posted on Jan 03, 2009

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Head loss is 70m, and discharge is 6.92
l/s .how calculate pump horse power

Posted on May 03, 2010

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It seems as if youve already got the best solutions

Posted on Oct 02, 2011

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What size circulating pump will I need to buy for my closed loop infloor heating system for my garage floor that is 30ft by 40ft? The pex tubing is in the S shape,1ft apart and is a 3 zone configuration if that helps.

Truewoman

Posted on Jan 09, 2010

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Posted on Jan 02, 2017

Thank you for posting your question here on Fixya.com.

The short answer is based on amount of fluid needed at the delivery point(s) and at what pressure that fluid needs to be at those points. If it is a pool pump the answer changes slightly since a pool is a closed loop system and you are more concerned with the turnover rate of the water in order to keep it clean. Is there a specific application you need help with? If so please add a comment to this post and I'll see what I can do to assist.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowmotor.net. Positive feedback is appreciated once your problem is solved!

Posted on Mar 11, 2011

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### How do i calculate pump size how do select pump

Thank you for posting your question here on Fixya.com.

The short answer is based on amount of fluid needed at the delivery point(s) and at what pressure that fluid needs to be at those points. If it is a pool pump the answer changes slightly since a pool is a closed loop system and you are more concerned with the turnover rate of the water in order to keep it clean. Is there a specific application you need help with? If so please add a comment to this post and I'll see what I can do to assist.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowmotor.net. Positive feedback is appreciated once your problem is solved!

Mar 11, 2011 | Hayward Sand Filter System & Tank 21" 1...

### Have a 12 lengths mechanical deep well, run by a 3HP US Motor. Wants to change the motor to a 1.5 HP to save on power. Tried this but the motor heats up. I presume I have to change the pulley size and or...

Thank you for posting your question here on Fixya.com.

No one can answer that for you without knowing information about the actual installation. In short, you can not lower the horsepower without dropping the load. If reducing the speed of the pump lowers the load enough you could then use a smaller drive motor but the pump will deliver less product as a result. Using a pump curve you should be able to calculate the reduced head from slowing the unit down and the horsepower required at that point of the pump curve. Size the motor accordingly. As a rule though, I doubt you could drop to half the horsepower and still operate the pump on its curve. You may need to put a 2 hp on it.

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