Penductor and eductors, huh?

[jt481]

Can anyone explain what this is? Sold by Marinedepot.com


Penductor

Sparging Eductors

FEATURES

· Flows comparable with conventional 3/8 tank mixing eductors

· Lower profile helps save your valuable tank space and makes for easier retrofits

· Larger connection sizes eliminate the need for multiple bushings when using standard fittings or our P-Series pumps

· Larger plume dispersion angle helps eliminate dead spots between eductors

· Maximum temperature 280¼F (PVDF)

Our new PENDUCTOR Sparging Eductor offers a new twist to the current eductor craze. Based on established eductor principles, the PENDUCTOR was designed especially for Industrial Sparging Applications. The nozzle was designed utilizing the same orifice size as a typical 3/8Ó NPT tank mixing eductor, with a larger connection size, giving you the same flow characteristics with less pressure drop. This can reduce the horsepower required on larger systems. The larger connection sizes allow you to use standard reducing tees without extra bushings or reducing couplings, saving you valuable tank space. The diffuser was designed with a larger plume dispersion angle for more uniform agitation and a lower profile to allow you to utilize your tank space more efficiently. The result, the PENDUCTOR, a more efficient space saving eductor made specifically for the surface finishing industry.

Download PDF for this new eductor - bulletin 704 - 143KB PDF format



Customer Reviews

 

[Unarce]

I think a penductor is just a shorter version of the eductor. Slightly less efficient, but less of an eyesore.

 

[Anonymous]

A penductor is an eductor. They work by taking the momentun of high velosity water and using it to induce additional flow. They really work nice.

I designed some industrial ones a while back to go with an underwater trenching sled I designed. They were used like a vaccuum (the induces flow) to remove silt.

 

[bleedingthought]

While we're on the subject of eductors, I hear they don't work well with OM units? :?

 

[Anonymous]

Not sure. If they do it has to be something to do with the back pressure. Check the OM site. They have lots of good info.

 

[jt481]

Do you attach it to a powerhead like a mag which has a threaded output for increased flow? Or is this device strictly for commercial uses?

 

[Anonymous]

You need a pressure rated pump to drive them correctly. Something like a pawnworld or Iwaki. I have two in my tank. You really can not see them in this shot, but they are on the ends of the PVC pipes. They do not have to point down, that's just what I did.

 

[Anonymous]

Here is how the look installed. This was during the construction phase.

 

[Unarce]

Yes, they are far more efficient on a pressure-rated pump. That's where people get the x5 increase in flow. On a non-pressure rated pump, you can only expect a x3 increase at the most.

 

[bleedingthought]

x3 is still great when you're talking a sequence dart.

 

[Unarce]

It is. Considering the minute cost of penductors, it's well worth it :wink:

 

[wetworx101]

Yeah, but thats only 3x the flow of whatever makes it through the nozzle... so if your dart gets its output cut in half or more in the process, you are barely making up the output you have lost. Ive done the math in the past and for most eductor/penductor systems, you spend so much more on the pressure rated pump wattage wise that the low-flow pump with regular outlets is still more economical. The only exception to this is on large pumps... like 4hp on up, where the back pressure that the eductors cause is laughed at by the sheer size of the pump.

 

[jt481]

Thanks for the education. And, a correction, Marine Depot does not sell them, it was Premium Aquatics that I was looking at.

 

[Anonymous]

Yeah, but thats only 3x the flow of whatever makes it through the nozzle... so if your dart gets its output cut in half or more in the process, you are barely making up the output you have lost. Ive done the math in the past and for most eductor/penductor systems, you spend so much more on the pressure rated pump wattage wise that the low-flow pump with regular outlets is still more economical. The only exception to this is on large pumps... like 4hp on up, where the back pressure that the eductors cause is laughed at by the sheer size of the pump.

I don;t agree with the large pump part, but the rest is true. If you are not using a pressure rated pump it is not efficent way to increase the flow. Do you by chance have a loss curve for a penductor?

 

[bleedingthought]

So, the back pressure that is created by the penductors is too much for a dart to handle (or increase the flow at all) at 1-2 feet of head pressure? :?

 

[Anonymous]

I'm not sure how much back pressure the penductors create. The induced flow on a non-pressure rated pump will not be as significant as a pressure rated pump for the rason stated. A pump like a dart will have more of a flow loss per ft of loss that say a panworld.

 

[wetworx101]

and then look at the increase in wattage for a PAN WORLD per gph, and see how much extra you have to spend to get the penductors to work properly. Usually, a good, low pressure, high-flow pump (low wattage) like a Dart just does better on its own with some large size piping.

When you start to get into large pumps, even ones that are otherwise considered 'flow' pumps, the sheer centrifugal force they create in their impeller wells overcomes the back pressure introduced by the penductor that much easier. Thats why I say 'large' pumps. Contrast this to smaller pumps, ones that might be small and still try to keep a good head pressure. It just doesnt happen as well. Smaller pumps, even when intended for pressure apps, just arent able to overcome back pressure as easily. This is proven by thermaldynamics as Newton's conservation of energy, and then Bernoilli's work shows that flow and pressure are directly related. So when you get to a certain size pump, the percentage loss due to 10psi of back pressure is nothing compared to a smaller pump, like say, 140watts, where 10 psi would kill it all together.