New tank with sump is noisy.

[ragin_cajun]

ragin_cajun thx fpr explain bud. I feel like allot of these threads (me included) dont give enough attention to what the e drain can handle...its almost an after thought

Absolutely! It's the E-Drain that limits the pump size, or has to match the pump output. Everybody focuses on what a siphon drain will do. From BA's chart, we can see that's easy--A LOT. WAY more than the E-Drain will drain if it's every called on to take over.

The real number we need to know is the drain rate of our E-Drain, in an emergency, with water getting sucked in, souding like a waterfall, with highly turbulent flow. THAT number is the important one, and that's the lower one, and I think that's what's reflected in the chart you posted.

For my tank, I have 2 2 inch E-Drains. I think each one drains at LEAST 2200 GPH (probably more) and they're very loud. Lots of turbulence. so, I have 2 Laguna 2400's that output 2000 GPH each with 5 foot head factored in.

 

[jaws7777]

Absolutely! It's the E-Drain that limits the pump size, or has to match the pump output. Everybody focuses on what a siphon drain will do. From BA's chart, we can see that's easy--A LOT. WAY more than the E-Drain will drain if it's every called on to take over.

The real number we need to know is the drain rate of our E-Drain, in an emergency, with water getting sucked in, souding like a waterfall, with highly turbulent flow. THAT number is the important one, and that's the lower one, and I think that's what's reflected in the chart you posted.

For my tank, I have 2 2 inch E-Drains. I think each one drains at LEAST 2200 GPH (probably more) and they're very loud. Lots of turbulence. so, I have 2 Laguna 2400's that output 2000 GPH each with 5 foot head factored in.

In terms of how we are using the siphons and these drains im past trying to figure out the exact gph...too many variables head, pressure on the gate/plumbing ect ect. Only thing i care about is if the gph exceeds the what the e drains can handle, detectable ammonia, and crud settling. If all are a no then im good.

Question about the charts though. I feel like the one with the green reads like this :

1st column beaing gravity feed/air in the lines/e drains

2nd column would be a baseline under full siphon but not really taking into acount of other variables like distance and pressure on the gate/plumbing...so a good guestimate.

Am i understanding it correctly ?

 

[ragin_cajun]

The flex pvc chart, the green columns......those are minimum flow rate expected in a certain size pipe, with gravity pulling the water down through the pipe -- as opposed to a pump pushing water into the pipe under pressure. The yellow and red columns are drain rates with pumps supplying fluid under pressure.

so....I take that to mean a kinda good estimate of what an E-Drain will handle in our situations if the siphon drains close off completely. For a 2 inch pipe, that's 3300 GPH, which sounds high to me.....but, maybe not.

BUT... the flex pvc chart is interesting because it shows a flow rate at a specific fluid velocity. Using that, and comparing to flow calculators on the Internet, you can start making comparisons and getting very good estimates of drain rate in a siphon drain......