DIY Group Project - Eductors

[Geoff]

our first DIY group project will be eductors.

let start out by discussing what are eductors, how are they used, and why would you want to have them in our systems.

G~

[thebutler4]

This is cool! .. Eductors are very cool! ... Geoff correct me if I am wrong .. but eductors will increase the ammount of flow out of the nozzle ... for example ... say ou have a return pump that puts out ~400 GPH .. with a eductor at the nozzle of this return pump you can increase total water flow up to 20 times is out put .... (pending you have a pump with enough back pressure) ....

[Wiskey]

Well, an educator is put on a closed loop or return pump as a sort-of nozzle, it requires a high pressure pump because of the way it constricts the water down to deliver a very fast moving center colum of water to draw outside water with it. We want them in our systems because if used correctally they can multiply the flow out of a correctly used/setup pump by up to 5 times.

Whiskey

[Geoff]

4 to 5 times the inner nozzle flow rate is normal for an eductor. the greater the pressure difference the higher the multiple factor.

pressure rated pumps are helpfull for eductors. they are not necessary, but when used the results are amazing.

when figuring out your total flow rating it is important to figure out what is actually coming out of the eductor at the nozzle. not what the pump is rated for normally.

how many of you know how to read a pump curve?

G~

[Wiskey]

Here is a helpfull link, I have been doing some research on these because I want to use them on my next tank and ran across this page on Penductors, but they work the same way.

http://www.kthsales.com/website/Misc...nthusiasts.htm

HTH,
Whiskey

[Krux]

i know ow to read a pump curve!

the question is, can you figure a ballpark on how many feet of backpressure an eductor will put on the nozzle without running it out of water and physically measuring the flow?

[Geoff]

i have found that they tend to add about 7-10feet of head pressure to the system. this can be varied by the size of the nozzle within the eductor. this is just from experience with the many pumps and eductors i have made.

G~

[Casey]

G can you please explain the different pumps like what do you mean by a pressure rated pump?What are the differences thank you.

[tims]

Can they be added to any tank's return?

[Viv]

Just got home from working all night and this has been a non-stop thread running through my head all night...I'm game even if I only appear to have about a 7PSI, I believe it will help. But what's the difference between a penductor and an eductor?

[Geoff]

Originally Posted by Casey

G can you please explain the different pumps like what do you mean by a pressure rated pump?What are the differences thank you.

when i say pressure rated pump i mean a pump that can handle over 20' of head pressure. even in a lot of the pump catalogs i look in, they can not decide on a definition of low, medium and high head pumps. they seem to all agree under 20' is low and under 60' is medium. above 60' is high. this is quite a bit more than what we need in our systems unless you want a bazillian eductors on a tank.

G~

[Geoff]

Originally Posted by tims

Can they be added to any tank's return?

after much experimenting i think they can be added to any return. the benefits may not be as much on some as on others. we will get into which would be better on which returns in a bit.

G~

[Geoff]

Originally Posted by Viv

Just got home from working all night and this has been a non-stop thread running through my head all night...I'm game even if I only appear to have about a 7PSI, I believe it will help. But what's the difference between a penductor and an eductor?

even with 7psi you can give them a try. that is still 16' worth of head pressure, not to shappy.

honestly i have not been able to find a true difference between a penductor and an eductor. size tends to be the main difference, but i am pretty sure it is just marketing differences between companies.

G~

[VWD]

I'm here for the project. just reading and learning about them, never reall did any research on the before, So I can't add anything Here.

[tdwyatt]

so what is the plan?