how to calculate the uncertainty?

[ashkanoghabi]

How to measure the head and motor power in vertical turbine pump? how to define their uncertainties. actually I have a set of data for one of them. I have to assume their uncertainties.

H P T
17.8 52900 0.022
18.9 51700 0.025
20.5 51700 0.032
22.2 52100 0.045
27.8 56400 0.134

 

[DubMac]

?????

What in the world is your question?

 

[rmw]

You need a statistical analysis program. If you know anyone who is Six Sigma trained he/she will have one you can use and will know how to 'drive' it.

rmw

 

[BigInch]

Only the first point looks uncertain.

Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso

 

[chicopee]

You'll need a lot more data points than what you have presented.

 

[stanier]

Looking at pump acceptance standards you will find upwards of 4% tolerance on performance. ISO9906, API 610 or AS 2419.

The biggest uncertainty is the salesman who has flogged you a pump running at 135% of BEP and has only considered one duty point not the whole range of operating flows and heads.

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/