×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pump Curve Viscosity Correction Help Needed

Pump Curve Viscosity Correction Help Needed

Pump Curve Viscosity Correction Help Needed

(OP)
Hello,

I am trying to correct a Finn T-30 Hydroseeder and pump's pump curves for a non-water viscosity.

I have used a graphics program to record discrete values for the pump curve and they are all organized into excel, but I am having trouble with the conversion factors. I cannot use this calculator: http://www.engineeringpage.com/calculators/pumps/v... because I need to do a couple hundred discrete values.

I have also tried to use polynomial coefficients given by page 3 and 4 of this document: http://www.warrenpumps.com/brochures/Fluid%20Visco...

Can anyone help me find a way to iterate the online calculator? I have tried using macros but to no avail.

Any help would be greatly appreciated.

Thanks in advance,

Jared

RE: Pump Curve Viscosity Correction Help Needed

What's your fluid, temperature and viscosities?

Learn from the mistakes of others. You don't have time to make them all yourself.

RE: Pump Curve Viscosity Correction Help Needed

(OP)
The fluid is a gel made from a polymer powder and water. 1000 cSt. I'm not sure what you are using the temperature for so it would be hard to say. The ambient temperature could be anywhere from 5-100 F.

RE: Pump Curve Viscosity Correction Help Needed

Viscosity should always be discussed with their associated temperatures. Note that in the 3rd paragraph of your attached article it also tells you that "viscosity is strongly associated with temperature".

Next question is the gell viscosity also dependent on shear rate? You'll see that discussion on page 2.

What is it exactly that are you trying to "convert"?

Learn from the mistakes of others. You don't have time to make them all yourself.

RE: Pump Curve Viscosity Correction Help Needed

(OP)
I would like to recreate (correct) the pump curve for our gel from the pump curve provided by Finn which shows the performance of water. For my purpose we can assume 1000 cSt and ignore the shear rate. I attempted to use the polynomial coefficients and the psuedocapacity from the linked document to determine the corrected values but I am sure that I made a mistake because the values it gave were impossible.

I would love if there was a more simple way than using this nomograph, as I need to calculate the corrected values for a large amount of values. It would be great to be able to use the linked website calculator, but I can't do it one value at a time. Maybe I need a computer scientist to get the underlying calculations from the website calculator.

RE: Pump Curve Viscosity Correction Help Needed

I was trying to establish if we could use the method before we got to calculating the coefficients, but you seem intent on using the website calculator, so just write a script to call the web page, fill in the data, send and read the returns.

Learn from the mistakes of others. You don't have time to make them all yourself.

RE: Pump Curve Viscosity Correction Help Needed

There is a wealth of data in pump books on viscosity de - ratings however this is usually for known and established products, doesn't the polymer supplier have any data you can use.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Pump Curve Viscosity Correction Help Needed

Maybe I'm missing something but why don't you get a copy of the HI standard 9.6.7 (2010) and put those formulae into an Excel sheet ? You can get it at www.pumps.org

It should be pretty easy to iterate that way...

The other thing I'd be concerned about is that the Warren Pumps article appears to reference an obsolete version of the HI standard. The online calculator doesn't say which version of HI it is using, so it is probably suspect too.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources