Thoughts on eductors

[Bullet]

So....at 600 times 2 = 1200 GPH on my drains and 1500 on the returns I will have to valve it down a little anyway. That goes along with my original thought....Since the pump is more than I need..instead of valving it down....I might as well restrict the flow with eductors and in turn add flow with eductors. Does that make sense

 

[mwood]

You should probably turn both holes into drains in the overflow if your going to do that. You need a minimum flow for an eductor. The 1" plus the 3/4" drain line should bring you to 950 gph per the calculator if the overflow can handle it. You may need to get out the dremal.

 

[Bullet]

How do you figure that Marcus? Here is my thiniking:

Pump at 0' head is 1900 GPH
Add 12' foot vertical head and 6' horizontal head and a Y reducing it to 3/4" for the last 3 feet I am guessing that will bring the pump to somewhere under 1300gph wide open.
Then add more head presssure with the eductors I would think that would bring me down to around 1000 GPH.
If my overfows can handle 1200....I should be fine. If not I can throtle down the output of the pump.

If I do not use the eductors I would have to throtle down this pump anyway...so again...my thought is why not add more flow...less turn over(so my overflows can handle it) and run the pump wide open.

Where is my thinking wrong?

I thought about the OM SS but I do not feel like messing with all that right now. Probably someday when I have a drilled tank I will have a couuple OM's.

 

[mwood]

Well, I understand your overflow has a 1" line and a 3/4" line. Based on the calculator, that is 600 and 350 for each drain. These calculations may be conservative, I'm not sure what the calculations are based on and I sure you can get more through them. You have to decide if you want to.

The flow was based on a guess on what you wanted to do. Using the calculator, I think I used 12' in overhead, a 5' horizontal, and a couple 90's. Landed between 1400-1500 gph. Also there are flow requirements on the website you posted. Given this information, You would only have flow for one. Then I remember reading estimates of eductors reducing flow by 40-50%. Leaving you with 700-900 gph in turnover.

 

[Bullet]

I have two drains(overflow). Each have a 1" drain and a 3/4 return. The drains are plumbed with each having 1" spaflex going directly to my sump 10 feet below. The returns are a single 1" return until it gets under my tank where it is split via a 3/4 Y to each return. Are you thinking I only have one 1" and one 3/4" drain? Also...I am not going to use the return line as a drain. I will just throttle back the pump before I do that.

If I can get my turnover with these eductors around 1000 GPH I would be happy. Then I the force of flow coming out of each return with the eductors would be 2,500 GPH.

 

[mwood]

Yeah, I misunderstood how many overflows you have.

PS, flow is still a little shy of running two eductors based on the website, but am not sure what else you could do.

 

[matt the fiddler]

Use the eductors they restrict a lot of flow out of the pump.. more than you think they would.....

even with one eductor, and the other outlet throtled back, you would gain ground.

Matt