Math/plumbing question

[Mikey0909]

I was wondering what rating (GPH) return pump to get for my sump. I need one that is able to output 200 GPH through 3/4 of an inch pipe. it needs to lift the water about 45 inches. I am assuming that there is some kind of a math equation that you can use to figure this out but I have absolutely no idea what the answer is and I have spent around 20 minutes searching and I have yet to find any kind of a equation or answer. Some help would be greatly appreciated!

 

[Pistondog]

I was wondering what rating (GPH) return pump to get for my sump. I need one that is able to output 200 GPH through 3/4 of an inch pipe. it needs to lift the water about 45 inches. I am assuming that there is some kind of a math equation that you can use to figure this out but I have absolutely no idea what the answer is and I have spent around 20 minutes searching and I have yet to find any kind of a equation or answer. Some help would be greatly appreciated!

I have one of these pushing 275 gph thru 1" pipe, same lift.

eFlux 6009 DC Flow Pump (1050 GPH) - Current USA (DISCONTINUED)

The Current USA eFlux DC Water Pumps are a completely controllable, quiet, powerful, and compact return pumps that can be installed inline or external on marine or fresh water systems. Features Soft start gently ramps pump to speed Controllable, adjustable flow rate Quiet operation Up to 65%...

www.bulkreefsupply.com

Make sure the drain can handle your 200 gph.

 

[Mikey0909]

I have one of these pushing 275 gph thru 1" pipe, same lift.

eFlux 6009 DC Flow Pump (1050 GPH) - Current USA (DISCONTINUED)

The Current USA eFlux DC Water Pumps are a completely controllable, quiet, powerful, and compact return pumps that can be installed inline or external on marine or fresh water systems. Features Soft start gently ramps pump to speed Controllable, adjustable flow rate Quiet operation Up to 65%...

www.bulkreefsupply.com

Make sure the drain can handle your 200 gph.

Do you think that may output more than 200 GPH? my overflow cannot handle more than that.

 

[Pistondog]

Do you think that may output more than 200 GPH? my overflow cannot handle more than that.

It is a dc pump and adjustable, down to 1/3 of that.
With 3/4" you'll be lucky to get 200gph

 

[Mikey0909]

It is a dc pump and adjustable, down to 1/3 of that.
With 3/4" you'll be lucky to get 200gph

Should I go larger?

 

[Pistondog]

Should I go larger?

How big is the tank and why 3/4"

 

[Mikey0909]

How big is the tank and why 3/4"

It would match the overflow bulkhead size, the tank is 30 gallons in the sump will be 10 gallons

 

[Mikey0909]

It would match the overflow bulkhead size, the tank is 30 gallons in the sump will be 10 gallons

I thought it would make sense for all of the piping to be the same size.

 

[Pistondog]

It would match the overflow bulkhead size, the tank is 30 gallons in the sump will be 10 gallons

Make sure the pump fits in the sump.
200 gph seems ok. Could go down to 150 gph. Just make sure you have good flow with a powerhead in the tank.

 

[Mikey0909]

Make sure the pump fits in the sump.
200 gph seems ok. Could go down to 150 gph. Just make sure you have good flow with a powerhead in the tank.

I have a 500 gph powerhead, so that would be 700 gph total. Should that be good?

 

[Pistondog]

I have a 500 gph powerhead, so that would be 700 gph total. Should that be good?

Depends on the powerhead and manufacturer. Some stretch their specs.
I have an mp10 on my 20g that works great to supply 6 inches per sec of wave flow. I have the mp10 set 5s on then 5s off at 50%. I can watch the mp10 turn on and eyeball the time it takes the corals to start waving/moving.
There's a sweetspot for water motion and nutrient uptake, if that's interesting.
I like the wave as not constant to dislodge particulates

 

[Killingtime]

I was wondering what rating (GPH) return pump to get for my sump. I need one that is able to output 200 GPH through 3/4 of an inch pipe. it needs to lift the water about 45 inches. I am assuming that there is some kind of a math equation that you can use to figure this out but I have absolutely no idea what the answer is and I have spent around 20 minutes searching and I have yet to find any kind of a equation or answer. Some help would be greatly appreciated!

I think the equation you are looking for is called head pressure. You need to put together a plan for your plumbing then look for a pump that will give you the GPH you are looking for AFTER deducting a few things. You know you have to lift the water 45", so that is almost 4' of head pressure. Then add head pressure for any barbed fittings, gate valves, check valves, 90* elbows, 45*elbows.

I think it goes as follows;
45* elbow - .5'
90* elbow - 1'
gate valve - .5'
ball valve - .5'
barbed fitting - 1'
10' of horizontal pipe - 1'
1' of vertical pipe - 1'

How To Properly Size A Return Pump For An Aquarium

Find out how to calculate head pressure and properly size your return for a saltwater reef aquarium.

www.marinedepot.com

Don't worry about the 3/4 pipe. That can push up to 1,380 GPH, and drain up to 780GPH per
http://calctool.org/CALC/eng/civil/hazen-williams_g
Of course, this is in perfect conditions so your results will be different.

Pistondog has given you good advice though. I'd go with a DC return pump. That way you can easily tune it to EXACTLY what you need without overwhelming your overflow.

Clear as mud! Hope I helped and didn't confuse you more.

 

[WVNed]

You use a chart like this and then add a little more height for the fittings and you will come close

 

[KStatefan]

Pentair has a nice calculator for calculating head loss

https://pentairaes.com/pump-calculator?__cf_chl_managed_tk__=pmd_37021bf3d941a776c69a25722b241d33d8a101f2-1626783477-0-gqNtZGzNAvijcnBszQti

 

[Mikey0909]

I think the equation you are looking for is called head pressure. You need to put together a plan for your plumbing then look for a pump that will give you the GPH you are looking for AFTER deducting a few things. You know you have to lift the water 45", so that is almost 4' of head pressure. Then add head pressure for any barbed fittings, gate valves, check valves, 90* elbows, 45*elbows.

I think it goes as follows;
45* elbow - .5'
90* elbow - 1'
gate valve - .5'
ball valve - .5'
barbed fitting - 1'
10' of horizontal pipe - 1'
1' of vertical pipe - 1'

How To Properly Size A Return Pump For An Aquarium

Find out how to calculate head pressure and properly size your return for a saltwater reef aquarium.

www.marinedepot.com

Don't worry about the 3/4 pipe. That can push up to 1,380 GPH, and drain up to 780GPH per
http://calctool.org/CALC/eng/civil/hazen-williams_g
Of course, this is in perfect conditions so your results will be different.

Pistondog has given you good advice though. I'd go with a DC return pump. That way you can easily tune it to EXACTLY what you need without overwhelming your overflow.

Clear as mud! Hope I helped and didn't confuse you mor

I think the equation you are looking for is called head pressure. You need to put together a plan for your plumbing then look for a pump that will give you the GPH you are looking for AFTER deducting a few things. You know you have to lift the water 45", so that is almost 4' of head pressure. Then add head pressure for any barbed fittings, gate valves, check valves, 90* elbows, 45*elbows.

I think it goes as follows;
45* elbow - .5'
90* elbow - 1'
gate valve - .5'
ball valve - .5'
barbed fitting - 1'
10' of horizontal pipe - 1'
1' of vertical pipe - 1'

How To Properly Size A Return Pump For An Aquarium

Find out how to calculate head pressure and properly size your return for a saltwater reef aquarium.

www.marinedepot.com

Don't worry about the 3/4 pipe. That can push up to 1,380 GPH, and drain up to 780GPH per
http://calctool.org/CALC/eng/civil/hazen-williams_g
Of course, this is in perfect conditions so your results will be different.

Pistondog has given you good advice though. I'd go with a DC return pump. That way you can easily tune it to EXACTLY what you need without overwhelming your overflow.

Clear as mud! Hope I helped and didn't confuse you more.

This definitely helps, I really appreciate the advice!