3/4 and 1/2 inch penductors

[tperk9784]

I have searched everywhere and the answer still eludes me. can somone who understands how eductors work explain to me the difference in flow if I am running a 3/4 or 1/2 inch penductor with a pressure rated pump approximatly 1200 gph?


Thanks for your time and expertise.

Tim

[Weatherman]

With a pressure-rated pump, running 1200 gph at 4' head, the best choice would be either two 3/4" penductors, or three or four 1/2" penductors. Any fewer of the 3/4", or fewer of the 1/2", may, acutally, reduce the total flow you have in your tank because of how much the penductuctor's nozzle restricts the flow from the pump.

[Geoff]

here is a good site for explaining eductors and which pumps should be used.

what model of pump are you using? 1100gph at 4' of head does not necessarily mean it is a pressure rated pump. that same pump could be pushing 2000gph at 0' of head. i do not like to use pumps on eductors unless the pump can push at the very least 16' of head. i prefer to use pumps than can push over 23' of head.

G~

[tperk9784]

Originally Posted by Geoff

here is a good site for explaining eductors and which pumps should be used.

what model of pump are you using? 1100gph at 4' of head does not necessarily mean it is a pressure rated pump. that same pump could be pushing 2000gph at 0' of head. i do not like to use pumps on eductors unless the pump can push at the very least 16' of head. i prefer to use pumps than can push over 23' of head.

G~

It's a blueline 55 HD and I typo'd it it should have said 1100 GPH. their website says max head 28ft and GPH @0 feet is 1100. I am a real newbie at this pump stuff. thanks for your help.


Tim

[Geoff]

that pump should be able to push a single eductor without to much problem. not sure it could run 2 effectively since it looks to be about the same strength as a Velocity T3 and that does a lot better with one eductor than 2.

G~

[tperk9784]

Originally Posted by Geoff

that pump should be able to push a single eductor without to much problem. not sure it could run 2 effectively since it looks to be about the same strength as a Velocity T3 and that does a lot better with one eductor than 2.

G~

Thanks Geoff

[dngspot]

I am thinking of building a couple of these things and will be using a Ocean Runner 6500. It is my understanding that it will give 1700 gph. I know that this is not a pressure rated pump but would like to know what size eductor I should build.

[Beng]

Anyone recall seeing the link, yesterday I think I saw someone did a DIY eductor using black PVC fittings. I can't seem to find where I saw it.

Beng