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how to calculate the uncertainty?

how to calculate the uncertainty?

how to calculate the uncertainty?

(OP)
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
 

RE: how to calculate the uncertainty?

?????

What in the world is your question?

RE: how to calculate the uncertainty?

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

RE: how to calculate the uncertainty?

Only the first point looks uncertain.

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

RE: how to calculate the uncertainty?

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

RE: how to calculate the uncertainty?

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/

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