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Centrifigual Pumps with Adjustable Impeller Blades

03/18/2017 3:37 AM

Dear Pump Experts, I just came to know that there is a technology in the market that allows adjusting impeller vanes angle. I understand it helps in changing flow ranges of the pump while maintaining efficiency and head. Do you have such pumps in your plants or portfolio of products? Are they doing the same job of VFD? In what applications they are used? Are they reliable or require costly maintenance? If you already use some if them; I will be thankful if you can share the curves. Enjoy week end

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#1

Re: Centrifigual Pumps with adjustable impeller blades

03/18/2017 8:18 AM

It makes sense, it works for airplane propellers.

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#2
In reply to #1

Re: Centrifigual Pumps with adjustable impeller blades

03/18/2017 10:45 AM

Good point, it might be possible for axial-flow pumps, though I've not heard of it being done. Can't think how to do it with centrif, but perhaps somebody can.

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#3

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/18/2017 5:56 PM

Interest, I like to see the mechanism.

being a critical thinker,... by changing the impeller, how difficult it would be. With mineral build up, cost as compared to a vfd.

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#4

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/18/2017 7:10 PM

Something similar used on variable geometry turbochargers....but AFAIK, moveable vanes are used on the turbine side, not the compressor side...

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#5
In reply to #4

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/18/2017 8:50 PM

In the mean time,...I'll stick to a VFD

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#6

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/18/2017 11:42 PM

adjustable vanes or the principal behind it may work, it does for prop planes as so rightly noted earlier. but will it work on pumps?
There are a lot of things to be considered here, size of motor, TDH, burst pressure, system pressure, BEP.. etc!

All I see is a lot more hardware to go wrong, that needs constant maintenance and equipment that will be a bitch to fault find on when it does go wrong! Plus the cost of replacement!

VSD's & centrifugal pumps work together because of the laws of affinity, I'm sure you can google them.

Stick with VSD's.....

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#8
In reply to #6

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/19/2017 10:05 AM

I agree.

Work with air is different than working with water,...

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#7

Re: Centrifigual Pumps with Adjustable Impeller Blades

03/19/2017 5:20 AM

Can you nam some pump manufacturers which can produce such pumps?

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#9
In reply to #7

Re: Centrifigual Pumps with Adjustable Impeller Blades

04/25/2017 6:02 AM

Such pumps exist, and they are called "variable pitch blade" pumps. Those are exclusively mixed flow and axial pumps. Just google for variable pitch blade pumps and the results will guide you to the manufacturers.

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