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Hydraulic Resistance Coefficient K & Equivalent Length Calculation
#1
Posted 20 January 2015 - 01:03 PM
When we perform a hydraulic calculation of a piping system that has fittings we can use the resistance coefficient K or the equivalent length. Which one gives more accurate results? And why?
Also, is the K value independent of the flow rate and is it constant for a fitting size?
#2
Posted 20 January 2015 - 03:40 PM
There are methods that correlate K with size and flow, aka 2-K and 3-K methods. And you should know the relationship between K and equivalent length.
Bobby
#3
Posted 20 January 2015 - 07:11 PM
Vegeta ,
On top of Bobby's comment , you should investigate using the search feature in this Forum , Katmar and Ankur posted great info on the matter .
Good resource is Crane TP 410 Flow of fluid .
Breizh
#4
Posted 21 January 2015 - 12:29 AM
Variations on this question come up all the time, so I wrote a general article on the subject. It probably answers more questions than you are asking but you can easily skip the irrelevant sections. See
http://www.katmarsoftware.com/articles/pipe-fitting-pressure-drop.htm
Edited by katmar, 21 January 2015 - 01:09 AM.
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