eshopps drain flowrate questions

[jaws7777]

Thinking about building a sump fory 150 and as usual i have a bunch of questions.

Thinking of going with either the eshopps pf 1200 or 1800 which do you guys think ?

What i dont under stand is they are listed as the following pf 1200 -1000 gph and the pf 1800 is listed at 1600gph.


But looking at the following link if the pf 1200 is dual 1 inch bulkheads shouldnt it be closer to 2000 gph ? And the pf 1800 dual 1.5 inch bulkheads almost 4000 ?
https://flexpvc.com/Reference/WaterFlowBasedOnPipeSize.shtml
Also have a pic from a reef site which is more accruate ?



Reason why im asking is im trying to figure out the pump size.

 

[SandNukka15]

Go with the 1800.... if you go with a 1200 you can't increase flow of you want to......with a 1800 you can reduce flow if needed......

I had a 300 on a 55 gallon and a 800 on a 75 gallon

 

[jaws7777]

Thx SandNukka15 inwas thinking the same. Can reduce with gate valves.

Anyone have input on the drain flow rate questions

 

[jaws7777]

I feel like an idiot. I would guess the intake tube/ u tube would have something to do with the gph. Not just the bulkh3ad diameter


I was thinking of using the jebao dct 8000. With this. Hoping to use the lower settings.

shookONES millerkid519 slippery slimecoat ragin_cajun DN328 Woefulrelic

 

[millerkid519]

The u tube is a full syphon it will flow more then your bulkheads. It is the bulkheads that are a bottle neck aswell as the teeth in the inside box. The max flow of the overflow is determined by those 2 things.

 

[DN328]

Perhaps I'm reading the charts wrong, but at initial glance they don't seem too far off (bear in mind I've not had experience with Eshopps).

1200: I assume if the drain is natural gravity flow? It's listed at 1000gph with the two 1" drain design. The PVC chart lists 600gph natural gravity flow for one 1" drain. Double that it would be near 12000gph?

1800: Eshopps listed as 16000gph. For one 1.5" it's listed as 14000gph for natural gravity flow.

I think the "max" on the PVC chart is referencing the flow with a pump that is capable - that's why they had three columns? If you can swing it, I would agree to go with the 1800 and you can control as needed with the DC pump.

 

[jaws7777]

I dont know DN328 the chart on the pvc site says with minimal pressure i guess that wzplains the difference.

So i guess the dct 8000 would work. I dont wanna use the highest setting which is 2100ish gph. Should i go larger so i could run it on the lower setting

 

[DN328]

Are you going with 1800? Factor in any PVC turns and head pressure, I think you could swing the 800. If that were me, I'd get the next one up. I dont know the price and watts running difference with the Jebao. If not an issue, then it's a no brainer and I'd call it a day?

Again 2100 gph is quite high even on paper relative to your tank and the eshopp.

 

[jaws7777]

Yeah im gonna get the eshopps 1800 (1600 gph)
Now deciding on the dct 8000 or dct 12000.

Would 3/4 plumbing from pump to tank to provide better flow than the 1 inch ?

 

[Fish Tank Travis]

I think you might want to go at this from a different direction. I am currently at the same research stage with a 220 gallon tank I am supposed to pick up this week. However, I am not trying to base my pumps on my overflow but rather my overflows on my pumps.

I'll explain:

I know that my tank is a 220 gallon tank and I plan on running a 55 gallon sump. Therefore, I have a system of approximately 275 gallons (I know it is actually less because each tank doesn't actually hold the gallons it is identified by and the sump will not be filled to the top). I know that I want to achieve a turnover rate of about 6x per hour. This means that I want to pump 1,650 gph. Now, as I mentioned earlier, my system will not hold the "full" gallons it is identified by so I rounded that down to about 1,500 gph. To achieve this I looked at pumps and found the Rio 20HF that will pump around 900 gph at about 5' of head height. I plan on running two of these pumps (that have a total of about 1,800 gph) and will throttle them down to pump only about the 1,500 gph I want to achieve. This way I can turn one up if the other fails and my system will stay running in pretty good condition. I will also keep a spare pump on hand for the same occurrence.

Now, having figured out my desired turnover rate and how many gph I will need to achieve it, I went looking for an overflow(s) to match my needs. I came across the Custom Aquatics H2Overflow and decided that looks good for my tank. However, each one is only rated to flow about 1,200 gph. This is obviously not enough for my desired 1,500 gph flow rate, so I will run at least two of them, maybe three (I have a thread up right now regarding this question). This will allow my system to run at my desired turnover and flow rate.

I think you should be looking at something similar. You have a 150 gallon tank, plus whatever size sump you decide to go with, so you need to decide what turnover rate you would like for your system. Then use this number and figure out the pump you will need to achieve that flow rate and finally, figure out what overflow(s) you need to keep up with the chosen pump(s).

One other thing, I have heard that with the HOB overflows you need to keep a decent flow rate compared to what they are rated for in order to keep bubbles from gathering in the u-tube and eventually breaking the siphon. I am only mentioning this because I have heard it before but I have no first-hand experience with it so it may be nothing to worry about.

Good luck!