Overflow/return basics

[umbis]

I'm setting up my first system with a sump. 75 gallon DT, 20 gallon high sump. I have 2 holes drilled with 2" bulkheads. My return pump is a Marineland 1175GPH. I will be building an internal overflow box with teeth to help with surface skimming.

Questions:

Will this pump keep up with a 2" overflow or vise versa?
Do I need to install a ball valve on the overflow line (and/or the return line)?
Should I install a check valve on the return line?
The pump has 1" hose - are there adapters available that convert 1" hose to 2" bulkheads?

If I'm missing anything here feel free to mention it.

Thanks.

 

[Pistol]

2 inch should be OK
I like to run a bypass from the pump back to the sump with a valve to control the flow out the returns.
You can get a reducing bushing.

 

[curiousphil]

The overflow will only pull out as much water as you put into the tank, so you don't have to worry about an 1175 gph pump "keeping up" with the 2" bulkheads.  You should think of it the other way around when designing your overflow - will the 2" bulkheads keep up with the water being pushed by your 1175 gph pump?  (The answer is yes btw!)  Based on that info, the answer to your questions:

I'm setting up my first system with a sump. 75 gallon DT, 20 gallon high sump. I have 2 holes drilled with 2\" bulkheads. My return pump is a Marineland 1175GPH. I will be building an internal overflow box with teeth to help with surface skimming.

Questions:

Will this pump keep up with a 2\" overflow or vise versa?  As mentioned above, most definitely.

Do I need to install a ball valve on the overflow line (and/or the return line)?  Depends how you will be setting up your overflow.  If you have one of the two bulkheads going to a full-siphon line, you will want a valve on that to tune the amount of water going through that pipe.  Putting a ball valve on your return will allow you to fine-tune the amount of water you put out through your returns.  How will you be setting up your returns?  And how will you be configuring your overflow pipes?  These are the key questions that define whether you should use any ball valves.

Should I install a check valve on the return line? Check valves aren't very reliable, just make sure that when your return tank drains into your sump, that your sump can handle the amount of water.  I have a 30g sump but only keep it about 1/3 to 1/2 full.  You CAN install a check valve for the convenience of not having the sump fill up whenever you shut off the return - but don't count on it, still ensure that you keep the extra holding room available in your sump.

The pump has 1\" hose - are there adapters available that convert 1\" hose to 2\" bulkheads?  Yes

 

[pulpfiction1]

I have dual overflows on my 75 gallon both with 1 inch bulk heads. I used a blueline 40 pump for my return I believe I could run a pump twice as big without any issues

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[Jewel]

I agree, You should be fine, I would tee off your return with a valve back to the sump just in case. I've used a one way valve on my return before and liked it because I could restrict the flow back to the sump when the power goes out.