Vertical Cantilever Slurry Pump Critical Speed

[SlurryPumpPro]

TL;DR

I am working on calculating the critical speeds for vertical cantilever slurry pumps. These values are necessary for safe and efficient pump operation but I am having trouble finding the best method.

Hello all,

I am an engineer with a manufacturing company and I am working for calculating the critical speed for a vertical cantilever slurry pump. This pump design includes one ball bearing and one taper roller bearing within the bearing housing. Then the shaft extends vertically downward within a column with an impeller at the end of the shaft.

At this point, I have proven values that were provided to me but I need to calculate these values for new designs we are working on. Does anyone have a calculator that I can use or a step by step example for this problem? I can provide any details needed but at this point, any sort of assistance will be greatly appreciated.

Thanks,
SlurryPumpPro

 

[berkeman]

Welcome to the PF.

Can you provide a diagram or picture that clarifies your pump systems? I think that would help folks to respond. Is it a system like this?

http://www.tobeepump.com/fckeditor/php/upload/image/20170615/1497523464967507.jpg

 

[SlurryPumpPro]

Hi Berkeman!

The pumps I am dealing with are quite similar to the design on the left picture (standard type) that does not include the lower bearing (extension type). Eventually, I would like to work on that design as well.

If we can base discussions on the pump design in below that would be awesome.

 

[berkeman]

Here is the expanded drawing with the info on the numbered parts in case it helps folks to reply to your questions:

http://www.tobeepump.com/vertical-slurry-pumps/250sv-vertical-cantilever-pump.html

 

[Dr.D]

This is a classic problem in rotor dynamics, and not a simple one. I suggest some web research to see what software is now available.