what pumps are good for driving eductors?

mdrc · 08/15/2008, 01:05 PM

i want to run 2 eductors on a 1" scwd. i've heard iwaki can do it but are there any other pumps that are good for it?

crvz · 08/15/2008, 02:16 PM

I think any pressure rated pump will work with eductors.

One Dumm Hikk · 08/15/2008, 02:50 PM

First, any pump will run an eductor. They just won't run it efficiently. Meaning, you get less flow out of the eductor than if you didn't have the eductor.

With that said, most eductors will introduce ~10 feet of head pressure.

Figure out head pressure loss with your plumbing configuration, through the SCWD (I don't know what head pressure a SCWD introduces). Then, add 10 feet of head pressure to it, figure out what the pump would be pushing out the eductor. You have to determine if the pump can overcome the head pressure and then get enough flow back from the eductor to make up for the head pressure loss.

As for pumps and recommendations, I don't have one as it depends on other things other than the pump, eductor and SCWD. Mainly plumbing configurations and head losses from it all.

One Dumm Hikk · 08/15/2008, 02:55 PM

I was looking trying to find some info on the head pressure of a SCWD and most of what I find says you lose about 20% of the water flow through it due to head pressure. Something to consider.

Also, realize that as the SCWD is changing directions, the eductors won't be getting the full flow from the pump and that will drop the eductors production.

mdrc · 08/15/2008, 03:19 PM

ya i was looking at that to and saw that it reuced flow 15-20% and now i just want to do 2 eductors no switching, ive heard about iwaki 55 doing a great job but i dont want to pay 350$ if i dont have to. as far as plumbing it'll be about 12" up and the split via a y and the a 45 on each side and the go to the eductor

gkyle · 08/16/2008, 07:19 AM

I ran four 3/4" eductors off of a Barracuda pump and couldn't keep the sand in my tank. It also hurt the overall turnover rate quite a bit.

08/15/2008, 01:05 PM	#1
mdrc Registered Member Join Date: Aug 2008 Location: Dallas Texas Posts: 369	what pumps are good for driving eductors? i want to run 2 eductors on a 1" scwd. i've heard iwaki can do it but are there any other pumps that are good for it? __________________ Knowledge is knowing a tomato is a fruit, Wisdom is knowing not to put it in a fruit salad Chris Current Tank Info: a sps tank in the works

08/15/2008, 02:16 PM	#2
crvz Team RC Member Join Date: Jul 2005 Location: houstonia Posts: 7,989	I think any pressure rated pump will work with eductors. __________________ -Chris- You don't win friends with salad. "Look! They're trying to learn for free!" ... "Use your phony guns as clubs!" Current Tank Info: rectangluar? wet?

08/15/2008, 03:19 PM	#5
mdrc Registered Member Join Date: Aug 2008 Location: Dallas Texas Posts: 369	ya i was looking at that to and saw that it reuced flow 15-20% and now i just want to do 2 eductors no switching, ive heard about iwaki 55 doing a great job but i dont want to pay 350$ if i dont have to. as far as plumbing it'll be about 12" up and the split via a y and the a 45 on each side and the go to the eductor __________________ Knowledge is knowing a tomato is a fruit, Wisdom is knowing not to put it in a fruit salad Chris Current Tank Info: a sps tank in the works

08/15/2008, 02:50 PM	#3
One Dumm Hikk Moved On Join Date: May 2008 Location: Phenix City Alabama Posts: 739	First, any pump will run an eductor. They just won't run it efficiently. Meaning, you get less flow out of the eductor than if you didn't have the eductor. With that said, most eductors will introduce ~10 feet of head pressure. Figure out head pressure loss with your plumbing configuration, through the SCWD (I don't know what head pressure a SCWD introduces). Then, add 10 feet of head pressure to it, figure out what the pump would be pushing out the eductor. You have to determine if the pump can overcome the head pressure and then get enough flow back from the eductor to make up for the head pressure loss. As for pumps and recommendations, I don't have one as it depends on other things other than the pump, eductor and SCWD. Mainly plumbing configurations and head losses from it all.

08/15/2008, 02:55 PM	#4
One Dumm Hikk Moved On Join Date: May 2008 Location: Phenix City Alabama Posts: 739	I was looking trying to find some info on the head pressure of a SCWD and most of what I find says you lose about 20% of the water flow through it due to head pressure. Something to consider. Also, realize that as the SCWD is changing directions, the eductors won't be getting the full flow from the pump and that will drop the eductors production.

08/16/2008, 07:19 AM	#6
gkyle Premium Member Join Date: Jan 2008 Posts: 354	I ran four 3/4" eductors off of a Barracuda pump and couldn't keep the sand in my tank. It also hurt the overall turnover rate quite a bit.